$ATO
Atmos Energy Corp Stock $ato

$ato Overview Financials Valuation SEC Filings Company Website

2014 Q3 Form 10-K Financial Statement

#000073180214000034 Filed on November 06, 2014

Income Statement

Concept	2014 Q3	2014	2013 Q3
Revenue	$789.0M	$3.244B	$674.4M
YoY Change	17.0%	-16.3%	22.04%
Cost Of Revenue	$441.1M	$3.359B	$373.9M
YoY Change	17.97%	36.34%	24.26%
Gross Profit	$337.7M	$1.522B	$300.4M
YoY Change	12.39%	7.78%	20.47%
Gross Profit Margin	42.79%	46.91%	44.55%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$68.30M	$254.0M	$60.20M
YoY Change	13.46%	7.21%	-3.22%
% of Gross Profit	20.23%	16.69%	20.04%
Operating Expenses	$253.7M	$944.6M	$250.1M
YoY Change	1.44%	3.79%	13.01%
Operating Profit	$83.94M	$577.2M	$50.38M
YoY Change	66.61%	15.01%	121.07%
Interest Expense	-$33.70M	$129.3M	-$31.80M
YoY Change	5.97%	0.69%	-6.19%
% of Operating Profit	-40.15%	22.4%	-63.12%
Other Income/Expense, Net	-$1.200M	-$3.003M	-$2.100M
YoY Change	-42.86%	1424.37%	-81.08%
Pretax Income	$49.00M	$444.9M	$16.50M
YoY Change	196.97%	19.19%	-174.32%
Income Tax	$25.30M	$174.6M	$8.900M
% Of Pretax Income	51.63%	39.24%	53.94%
Net Earnings	$23.71M	$289.8M	$7.536M
YoY Change	214.66%	19.17%	-5.41%
Net Earnings / Revenue	3.01%	8.93%	1.12%
Basic Earnings Per Share	$0.23	$2.96	$0.08
Diluted Earnings Per Share	$0.23	$2.96	$0.08
COMMON SHARES
Basic Shares Outstanding	100.4M shares	97.61M shares	90.64M shares
Diluted Shares Outstanding		97.61M shares

Balance Sheet

Concept	2014 Q3	2014	2013 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$121.9M	$42.00M	$138.9M
YoY Change	-12.25%	-36.36%	7.96%
Cash & Equivalents	$42.26M	$42.00M	$66.20M
Short-Term Investments	$79.61M		$72.68M
Other Short-Term Assets	$111.3M	$111.0M	$64.20M
YoY Change	73.31%	98.21%	-76.46%
Inventory	$279.0M	$279.0M	$245.0M
Prepaid Expenses	$25.04M		$21.67M
Receivables	$343.4M	$343.0M	$302.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$775.8M	$776.0M	$677.1M
YoY Change	14.58%	14.62%	-18.22%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.726B	$6.726B	$6.031B
YoY Change	11.53%	11.52%	10.14%
Goodwill	$742.0M		$741.4M
YoY Change	0.09%		0.09%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$350.9M	$351.0M	$485.1M
YoY Change	-27.66%	-14.81%	7.5%
Total Long-Term Assets	$7.819B	$7.819B	$7.257B
YoY Change	7.74%	7.74%	8.84%
TOTAL ASSETS
Total Short-Term Assets	$775.8M	$776.0M	$677.1M
Total Long-Term Assets	$7.819B	$7.819B	$7.257B
Total Assets	$8.595B	$8.595B	$7.934B
YoY Change	8.32%	8.33%	5.85%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$308.0M	$308.0M	$242.0M
YoY Change	27.27%	340.0%	12.56%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$196.7M	$197.0M	$368.0M
YoY Change	-46.55%	-46.47%	-35.55%
Long-Term Debt Due	$0.00		$0.00
YoY Change			-100.0%
Total Short-Term Liabilities	$910.7M	$911.0M	$978.5M
YoY Change	-6.93%	-6.85%	-23.31%
LONG-TERM LIABILITIES
Long-Term Debt	$2.456B	$2.456B	$2.456B
YoY Change	0.01%	0.0%	25.53%
Other Long-Term Liabilities	$68.87M	$855.0M	$37.56M
YoY Change	83.35%	13.1%	-25.96%
Total Long-Term Liabilities	$2.525B	$3.311B	$2.493B
YoY Change	1.27%	3.08%	24.22%
TOTAL LIABILITIES
Total Short-Term Liabilities	$910.7M	$911.0M	$978.5M
Total Long-Term Liabilities	$2.525B	$3.311B	$2.493B
Total Liabilities	$3.436B	$5.508B	$3.472B
YoY Change	-1.04%	2.88%	5.75%
SHAREHOLDERS EQUITY
Retained Earnings	$918.0M		$775.3M
YoY Change	18.41%		17.3%
Common Stock	$2.181B		$1.766B
YoY Change	23.46%		1.17%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.086B	$3.086B	$2.580B
YoY Change
Total Liabilities & Shareholders Equity	$8.595B	$8.595B	$7.934B
YoY Change	8.32%	8.33%	5.85%

Cashflow Statement

Concept	2014 Q3	2014	2013 Q3
OPERATING ACTIVITIES
Net Income	$23.71M	$289.8M	$7.536M
YoY Change	214.66%	19.17%	-5.41%
Depreciation, Depletion And Amortization	$68.30M	$254.0M	$60.20M
YoY Change	13.46%	7.21%	-3.22%
Cash From Operating Activities	$109.8M	$732.8M	$103.5M
YoY Change	6.09%	19.52%	51.98%
INVESTING ACTIVITIES
Capital Expenditures	-$282.7M	-$835.3M	-$262.5M
YoY Change	7.7%	-1.15%	11.46%
Acquisitions
YoY Change
Other Investing Activities	-$1.700M	-$2.109M	-$1.800M
YoY Change	-5.56%	-143.01%	-101.41%
Cash From Investing Activities	-$284.4M	-$825.0M	-$264.3M
YoY Change	7.6%	18.38%	145.4%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$390.2M
YoY Change
Debt Paid & Issued, Net		$0.00
YoY Change		-100.0%
Cash From Financing Activities	165.4M	$68.23M	194.9M
YoY Change	-15.14%	-20.43%	156.11%
NET CHANGE
Cash From Operating Activities	109.8M	$732.8M	103.5M
Cash From Investing Activities	-284.4M	-$825.0M	-264.3M
Cash From Financing Activities	165.4M	$68.23M	194.9M
Net Change In Cash	-9.200M	-$23.94M	34.10M
YoY Change	-126.98%	-1321.48%	-6.58%
FREE CASH FLOW
Cash From Operating Activities	$109.8M	$732.8M	$103.5M
Capital Expenditures	-$282.7M	-$835.3M	-$262.5M
Free Cash Flow	$392.5M	$1.568B	$366.0M
YoY Change	7.24%	7.54%	20.55%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	241611000	USD
CY2014Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	311604000	USD
CY2014Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	311604000	USD
CY2013Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	241611000	USD
CY2013Q3	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	70116000	USD
CY2014Q3	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	77860000	USD
CY2014Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	367392000	USD
CY2013Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	322616000	USD
CY2014Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	343400000	USD
CY2013Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	301992000	USD
CY2013Q3	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	54034000	USD
CY2014Q3	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	46445000	USD
CY2013Q3	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	50293000	USD
CY2014Q3	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	54319000	USD
CY2013Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1691364000	USD
CY2014Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1721794000	USD
CY2013Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	38878000	USD
CY2014Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-12393000	USD
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-47607000	USD
CY2013Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1765811000	USD
CY2014Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2180151000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25500000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	19200000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17800000	USD
CY2013Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	20624000	USD
CY2014Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	23992000	USD
CY2013	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	8480000	USD
CY2012	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	8147000	USD
CY2014	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	9409000	USD
CY2014	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	500000	USD
CY2013	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	500000	USD
CY2012	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	500000	USD
CY2012	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	4000	USD
CY2013	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	5000	USD
CY2014	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	0	USD
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2014	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	5288000	USD
CY2013	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2014Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	10500000	USD
CY2013Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	6800000	USD
CY2013Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	6764000	USD
CY2014Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	10508000	USD
CY2014Q3	us-gaap	Assets Assets	8594704000	USD
CY2013Q3	us-gaap	Assets Assets	7934268000	USD
CY2013Q3	us-gaap	Assets Current AssetsCurrent	677133000	USD
CY2014Q3	us-gaap	Assets Current AssetsCurrent	775840000	USD
CY2013Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	238760000	USD
CY2014Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	178970000	USD
CY2013Q3	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	64023000	USD
CY2014Q3	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	67466000	USD
CY2013Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	72682000	USD
CY2014Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	79613000	USD
CY2014	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1300000	USD
CY2013	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	2200000	USD
CY2014Q3	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	1300000	USD
CY2013Q3	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	1300000	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	636000	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	186000	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	0	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	78000	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	186000	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	186000	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	0	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	123000	USD
CY2014Q3	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	513000	USD
CY2014Q3	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	1100000	USD
CY2014Q3	us-gaap	Commercial Paper CommercialPaper	196700000	USD
CY2014	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-1436000	USD
CY2013	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	2165000	USD
CY2012	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	30266000	USD
CY2014	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	-792000	USD
CY2014	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	2486000	USD
CY2013Q3	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	1000000	USD
CY2013Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	5036080000	USD
CY2014Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	5542218000	USD
CY2013Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	66199000	USD
CY2014Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	42258000	USD
CY2012Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	64239000	USD
CY2011Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	131419000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-67180000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1960000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-23941000	USD
CY2013	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	15938000	USD
CY2012	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	-5797000	USD
CY2013Q3	us-gaap	Commercial Paper CommercialPaper	368000000	USD
CY2014	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.48
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.38
CY2013	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.40
CY2013Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0
CY2014Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0
CY2013Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2014Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2013Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	90640211	shares
CY2014Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	100388092	shares
CY2013Q3	us-gaap	Common Stock Value CommonStockValue	453000	USD
CY2014Q3	us-gaap	Common Stock Value CommonStockValue	502000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	238546000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	217570000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	329679000	USD
CY2013Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	275747000	USD
CY2014Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	247579000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	631000	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5527000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8178000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6888000	USD
CY2014Q3	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	9883000	USD
CY2013Q3	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	11723000	USD
CY2014Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	82085000	USD
CY2013Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	76313000	USD
CY2014Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2460000000	USD
CY2013Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2460000000	USD
CY2014	us-gaap	Debt Instrument Covenant Compliance DebtInstrumentCovenantCompliance	We were in compliance with all of our debt covenants as of September 30, 2014
CY2014Q3	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	2769541000	USD
CY2013Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4329000	USD
CY2014Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4014000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	103971000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	169106000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	124836000	USD
CY2013Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	15199000	USD
CY2014Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	13698000	USD
CY2014Q3	us-gaap	Deferred Gas Cost DeferredGasCost	20069000	USD
CY2013Q3	us-gaap	Deferred Gas Cost DeferredGasCost	15152000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	189952000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	141336000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	104319000	USD
CY2014Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1742209000	USD
CY2013Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1548883000	USD
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CY2013Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	10100000	USD
CY2014Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	22700000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9605000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-13237000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	10500000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	413811000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	371218000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	0	USD
CY2014Q3	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	10565000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	370133000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	406842000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	236626000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	196296000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	224200000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	12400000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	38013000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	28849000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	10100000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	116157000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	115970000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6969000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1085000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1335367000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1178750000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	14697000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	48751000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	21726000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	0	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	1286616000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	1164053000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	39045000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	37173000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1655894000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1445450000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	31252000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	19182000	USD
CY2014	us-gaap	Depreciation And Amortization DepreciationAndAmortization	253987000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	237525000	USD
CY2013	us-gaap	Depreciation And Amortization DepreciationAndAmortization	235079000	USD
CY2014Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	45827000	USD
CY2013Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	11966000	USD
CY2014Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	37009000	USD
CY2013Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	119777000	USD
CY2014Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	13038000	USD
CY2013Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	109354000	USD
CY2014Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1730000	USD
CY2013Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1543000	USD
CY2014Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	20126000	USD
CY2013Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	0	USD
CY2013Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	14700000	USD
CY2014Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	3100000	USD
CY2014	us-gaap	Derivatives Reporting Of Derivative Activity DerivativesReportingOfDerivativeActivity	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Financial instruments and hedging activities</font><font style="font-family:inherit;font-size:10pt;"> — We use financial instruments to mitigate commodity price risk in our regulated distribution and nonregulated segments and interest rate risk. The objectives and strategies for using financial instruments have been tailored to our regulated and nonregulated businesses and are discussed in Note 12.</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We record all of our financial instruments on the balance sheet at fair value</font><font style="font-family:inherit;font-size:10pt;font-style:italic;">,</font><font style="font-family:inherit;font-size:10pt;"> with changes in fair value ultimately recorded in the income statement. These financial instruments are reported as risk management assets and liabilities and are classified as current or noncurrent other assets or liabilities based upon the anticipated settlement date of the underlying financial instrument.</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The timing of when changes in fair value of our financial instruments are recorded in the income statement depends on whether the financial instrument has been designated and qualifies as a part of a hedging relationship or if regulatory rulings require a different accounting treatment. Changes in fair value for financial instruments that do not meet one of these criteria are recognized in the income statement as they occur.</font></div><div style="line-height:120%;padding-top:12px;text-indent:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Financial Instruments Associated with Commodity Price Risk</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In our regulated distribution segment, the costs associated with and the gains and losses arising from the use of financial instruments to mitigate commodity price risk are included in our purchased gas cost adjustment mechanisms in accordance with regulatory requirements. Therefore, changes in the fair value of these financial instruments are initially recorded as a component of deferred gas costs and recognized in the consolidated statement of income as a component of purchased gas cost when the related costs are recovered through our rates and recognized in revenue in accordance with accounting principles generally accepted in the United States. Accordingly, there is no earnings impact on our regulated distribution segment as a result of the use of financial instruments.</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In our nonregulated segment, we have designated most of the natural gas inventory held by this operating segment as the hedged item in a fair-value hedge. This inventory is marked to market at the end of each month based on the Gas Daily index, with changes in fair value recognized as unrealized gains or losses in revenue in the period of change. The financial instruments associated with this natural gas inventory have been designated as fair-value hedges and are marked to market each month based upon the NYMEX price with changes in fair value recognized as unrealized gains or losses in purchased gas cost in the period of change. We have elected to exclude this spot/forward differential for purposes of assessing the effectiveness of these fair-value hedges. </font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Additionally, we have elected to treat fixed-price forward contracts used in our nonregulated segment to deliver natural gas as normal purchases and normal sales. As such, these deliveries are recorded on an accrual basis in accordance with our revenue recognition policy. Financial instruments used to mitigate the commodity price risk associated with these contracts have been designated as cash flow hedges of anticipated purchases and sales at indexed prices. Accordingly, unrealized gains and losses on these open financial instruments are recorded as a component of accumulated other comprehensive income, and are recognized in earnings as a component of purchased gas cost when the hedged volumes are sold.</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Gains and losses from hedge ineffectiveness are recognized in the income statement. Fair value and cash flow hedge ineffectiveness arising from natural gas market price differences between the locations of the hedged inventory and the delivery location specified in the financial instruments is referred to as basis ineffectiveness. Ineffectiveness arising from changes in the fair value of the fair value hedges due to changes in the difference between the spot price and the futures price, as well as the difference between the timing of the settlement of the futures and the valuation of the underlying physical commodity is referred to as timing ineffectiveness. Hedge ineffectiveness, to the extent incurred, is reported as a component of purchased gas cost.</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our nonregulated segment also utilizes master netting agreements with significant counterparties that allow us to offset gains and losses arising from financial instruments that may be settled in cash with gains and losses arising from financial instruments that may be settled with the physical commodity. Assets and liabilities from risk management activities, as well as accounts receivable and payable, reflect the master netting agreements in place. Additionally, the accounting guidance for master netting arrangements requires us to include the fair value of cash collateral or the obligation to return cash in the amounts that have been netted under master netting agreements used to offset gains and losses arising from financial instruments. As of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">September 30, 2014</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2013</font><font style="font-family:inherit;font-size:10pt;">, the Company netted $</font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">25.8 million</font><font style="font-family:inherit;font-size:10pt;"> and $</font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">24.8 million</font><font style="font-family:inherit;font-size:10pt;"> of cash held in margin accounts into its current and noncurrent risk management assets and liabilities.</font></div><div style="line-height:120%;padding-top:12px;text-indent:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Financial Instruments Associated with Interest Rate Risk</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We manage interest rate risk, primarily when we plan to issue new long-term debt or to refinance existing long-term debt. We manage this risk through the use of forward starting interest rate swaps, interest rate swaps, and prior to fiscal 2012, Treasury lock agreements, to fix the Treasury yield component of the interest cost associated with anticipated financings. We designate these financial instruments as cash flow hedges at the time the agreements are executed. Unrealized gains and losses associated with the instruments are recorded as a component of accumulated other comprehensive income (loss). When the instruments settle, the realized gain or loss is recorded as a component of accumulated other comprehensive income (loss) and recognized as a component of interest expense over the life of the related financing arrangement. Hedge ineffectiveness to the extent incurred is reported as a component of interest expense. </font></div></div>
CY2013	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	8203000	USD
CY2012	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	9868000	USD
CY2014	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	0	USD
CY2013	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	5294000	USD
CY2012	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	6349000	USD
CY2014	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2012Q4	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2013Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2013Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2013Q2	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	5294000	USD
CY2013	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	11188000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	28238000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	18172000	USD
CY2013	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	7202000	USD
CY2014	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	0	USD
CY2013Q1	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	4085000	USD
CY2013Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	0	USD
CY2012Q4	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	3117000	USD
CY2013Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	0	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	10066000	USD
CY2013	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	3986000	USD
CY2014	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	0	USD
CY2013	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	2909000	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	3519000	USD
CY2014	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	0	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	24174000	USD
CY2013	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	5858000	USD
CY2013	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	10640000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	27627000	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	128115000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	125796000	USD
CY2014	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	146248000	USD
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.96
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.39
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.68
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.28
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.89
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.94
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.38
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.96
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.64
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.37
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.88
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.94
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.38
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2014Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	5300000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y7M6D
CY2014Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	278917000	USD
CY2013Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	244741000	USD
CY2013Q3	us-gaap	Financial Instruments Owned At Fair Value FinancialInstrumentsOwnedAtFairValue	121320000	USD
CY2014Q3	us-gaap	Financial Instruments Owned At Fair Value FinancialInstrumentsOwnedAtFairValue	58865000	USD
CY2014	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	198000	USD
CY2012	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	-1369000	USD
CY2013	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	97000	USD
CY2013	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	18103000	USD
CY2012	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	24469000	USD
CY2014	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	1694000	USD
CY2013Q3	us-gaap	Goodwill Goodwill	741363000	USD
CY2014Q3	us-gaap	Goodwill Goodwill	742029000	USD
CY2014	us-gaap	Goodwill Other Changes GoodwillOtherChanges	666000	USD
CY2013	us-gaap	Gross Profit GrossProfit	1412050000	USD
CY2014	us-gaap	Gross Profit GrossProfit	1582426000	USD
CY2012	us-gaap	Gross Profit GrossProfit	1323739000	USD
CY2012Q4	us-gaap	Gross Profit GrossProfit	362362000	USD
CY2013Q3	us-gaap	Gross Profit GrossProfit	300440000	USD
CY2013Q2	us-gaap	Gross Profit GrossProfit	316497000	USD
CY2013Q1	us-gaap	Gross Profit GrossProfit	432751000	USD
CY2014Q1	us-gaap	Gross Profit GrossProfit	496277000	USD
CY2014Q2	us-gaap	Gross Profit GrossProfit	359533000	USD
CY2014Q3	us-gaap	Gross Profit GrossProfit	337659000	USD
CY2013Q4	us-gaap	Gross Profit GrossProfit	388957000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	290422000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	373297000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	476819000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	192196000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	230698000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	289817000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	112340000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	77348000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	7536000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	33474000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.12
CY2014	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.96
CY2013	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.54
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.08
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.85
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.24
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.37
CY2014	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.96
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.10
CY2013	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.50
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.08
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.23
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.36
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.85
CY2014	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	24521000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	12496000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.14
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.27
CY2014	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.06
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.04
CY2013Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.04
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.27
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.14
CY2014	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.03
CY2013Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.06
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.04
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	142599000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	187002000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	98226000	USD
CY2013Q3	us-gaap	Income Tax Receivable IncomeTaxReceivable	3141000	USD
CY2014Q3	us-gaap	Income Tax Receivable IncomeTaxReceivable	5481000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2014	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	6969000	USD
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1085000	USD
CY2014	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	2307000	USD
CY2013	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	2153000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	2096000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	101648000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	166887000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	130655000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1453000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3817000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2801000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11559000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11636000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-4127000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-610000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-432000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10008000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-64234000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	55041000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	31912000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	73669000	USD
CY2014	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	41408000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-32578000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	31996000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-31979000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-28417000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-20989000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-15644000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	24411000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7889000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2413000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-44491000	USD
CY2014	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	2000	shares
CY2013	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	1178000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	1022000	shares
CY2013	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1900000	USD
CY2014	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1500000	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2600000	USD
CY2013	us-gaap	Interest Expense InterestExpense	128385000	USD
CY2014	us-gaap	Interest Expense InterestExpense	129295000	USD
CY2012	us-gaap	Interest Expense InterestExpense	141174000	USD
CY2012	us-gaap	Interest Paid InterestPaid	150606000	USD
CY2014	us-gaap	Interest Paid InterestPaid	156606000	USD
CY2013	us-gaap	Interest Paid InterestPaid	148461000	USD
CY2014Q3	us-gaap	Interest Payable Current InterestPayableCurrent	36768000	USD
CY2013Q3	us-gaap	Interest Payable Current InterestPayableCurrent	36744000	USD
CY2014	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-4230000	USD
CY2012	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-2009000	USD
CY2013	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-3489000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	80465000	USD
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	38768000	USD
CY2012	us-gaap	Inventory Write Down InventoryWriteDown	1700000	USD
CY2014Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8594704000	USD
CY2013Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7934268000	USD
CY2014Q3	us-gaap	Liabilities Current LiabilitiesCurrent	910650000	USD
CY2013Q3	us-gaap	Liabilities Current LiabilitiesCurrent	978486000	USD
CY2013Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1543000	USD
CY2014Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	21856000	USD
CY2014Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1300000000	USD
CY2013Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	25000000	USD
CY2013Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2014Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1260000000	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	500000000	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	450000000	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	250000000	USD
CY2014Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2014Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2455986000	USD
CY2013Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2455671000	USD
CY2014Q3	us-gaap	Marketable Securities MarketableSecurities	79613000	USD
CY2013Q3	us-gaap	Marketable Securities MarketableSecurities	72682000	USD
CY2014	us-gaap	Maximum Length Of Time Hedged In Cash Flow Hedge1 MaximumLengthOfTimeHedgedInCashFlowHedge1	P0Y61M0D
CY2014	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Nature of Business</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Corporation (“Atmos Energy” or the “Company”) and our subsidiaries are engaged primarily in the regulated natural gas distribution and pipeline businesses as well as certain other nonregulated businesses. Through our regulated distribution business, we deliver natural gas through sales and transportation arrangements to over </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">three million</font><font style="font-family:inherit;font-size:10pt;"> residential, commercial, public-authority and industrial customers through our </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">six</font><font style="font-family:inherit;font-size:10pt;"> regulated distribution divisions in the service areas described below:</font></div><div style="line-height:120%;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3" rowspan="1"></td></tr><tr><td width="48%" rowspan="1" colspan="1"></td><td width="4%" rowspan="1" colspan="1"></td><td width="48%" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Service Area</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Colorado-Kansas Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Colorado, Kansas</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Kentucky/Mid-States Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Kentucky, Tennessee, Virginia</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">(1)</sup></font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Louisiana Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Louisiana</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Mid-Tex Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Texas, including the Dallas/Fort Worth metropolitan area</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Mississippi Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Mississippi</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy West Texas Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">West Texas</font></div></td></tr></table></div><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:33px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:9px;"><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">(1)</sup> </font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Denotes location where we have more limited service areas.</font></div></td></tr></table><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In addition, we transport natural gas for others through our distribution system. Our distribution business is subject to federal and state regulation and/or regulation by local authorities in each of the states in which our regulated distribution divisions operate. Our corporate headquarters and shared-services function are located in Dallas, Texas, and our customer support centers are located in Amarillo and Waco, Texas.</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">During fiscal 2013 and fiscal 2012, we sold our regulated distribution operations in four states to streamline our regulated operations. On April 1, 2013, we completed the divestiture of our regulated distribution operations in Georgia, representing approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">64,000</font><font style="font-family:inherit;font-size:10pt;"> customers, and in August 2012, we completed the sale of our regulated distribution operations in Missouri, Illinois and Iowa, representing approximately </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">84,000</font><font style="font-family:inherit;font-size:10pt;"> customers.</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our regulated pipeline business, which is also subject to federal and state regulation, consists of the regulated operations of our Atmos Pipeline–Texas Division, a division of the Company. This division transports natural gas to our Mid-Tex Division, transports natural gas for third parties and manages five underground storage reservoirs in Texas. We also provide ancillary services customary to the pipeline industry including parking arrangements, lending and sales of inventory on hand. </font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our nonregulated businesses operate primarily in the Midwest and Southeast through various wholly-owned subsidiaries of Atmos Energy Holdings, Inc., (AEH). AEH is a wholly-owned subsidiary of the Company and based in Houston, Texas. Through AEH, we provide natural gas management and transportation services to municipalities, regulated distribution companies, including certain divisions of Atmos Energy and third parties.</font></div></div>
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	85747000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	73649000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-44837000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-696914000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-609260000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-837576000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	613127000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	586917000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	739986000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	289817000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	243194000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	216717000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	116425000	USD
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	7536000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	23713000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	45721000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	133367000	USD
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	87016000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	229923000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	191403000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	289106000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	229928000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	289106000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	191407000	USD
CY2014	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2014Q3	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	8	state
CY2014	us-gaap	Operating Expenses OperatingExpenses	971077000	USD
CY2013	us-gaap	Operating Expenses OperatingExpenses	910171000	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	877499000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	611349000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	446240000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	501879000	USD
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	86396000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	50383000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	210178000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	154922000	USD
CY2014Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	106605000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	83944000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	170720000	USD
CY2014Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	250080000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	155689000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	16673000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	15138000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	15907000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	16330000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	16021000	USD
CY2014Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	75620000	USD
CY2013Q3	us-gaap	Other Assets Current OtherAssetsCurrent	64201000	USD
CY2014Q3	us-gaap	Other Assets Current OtherAssetsCurrent	111265000	USD
CY2013Q3	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	6765000	USD
CY2014Q3	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	9145000	USD
CY2014Q3	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	14340000	USD
CY2013Q3	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	14595000	USD
CY2013Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	485117000	USD
CY2014Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	350929000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-213000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-53485000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-48060000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	79068000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	86698000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2214000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3103000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	853000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-51271000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	86485000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-51271000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	86485000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	853000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	2889000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1791000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	5029000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-186000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1881000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1199000	USD
CY2014	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	969000	USD
CY2013	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	679000	USD
CY2012	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	484000	USD
CY2014	us-gaap	Other Information Pertaining To Income Taxes OtherInformationPertainingToIncomeTaxes	results for fiscal 2012 were favorably impacted by a state tax benefit of $13.6 million (net of federal effects). Due to the completion of the sale of our Missouri, Iowa and Illinois service areas in the fiscal fourth quarter, the Company updated its analysis of the tax rate at which deferred taxes would reverse in the future to reflect the sale of these service areas. The updated analysis supported a reduction in the deferred tax rate which when applied to the balance of taxable income deferred to future periods resulted in a reduction of the Company’s overall deferred tax liability.
CY2014Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	402351000	USD
CY2013Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	368891000	USD
CY2014Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	68870000	USD
CY2013Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	37563000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	493000	USD
CY2013	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	2887000	USD
CY2014	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	428000	USD
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-5235000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-197000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-14644000	USD
CY2014	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	505154000	USD
CY2012	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	453613000	USD
CY2013	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	488020000	USD
CY2013	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	66626000	USD
CY2014	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	0	USD
CY2012	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	0	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4904000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4625000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2325000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	146248000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	125796000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	128115000	USD
CY2014	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	835251000	USD
CY2012	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	732858000	USD
CY2013	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	845033000	USD
CY2013Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	22940000	USD
CY2014Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	11380000	USD
CY2013Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	358787000	USD
CY2014Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	340963000	USD
CY2013Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	21666000	USD
CY2014Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	25039000	USD
CY2014	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Basis of comparison</font><font style="font-family:inherit;font-size:10pt;"> — Certain prior-year amounts have been reclassified to conform with the current year presentation.</font></div></div>
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	390205000	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2014Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	390200000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	493793000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2014	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	4274000	USD
CY2013	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	46000	USD
CY2012	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1606000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-165865000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-208070000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	354141000	USD
CY2012	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	128223000	USD
CY2013	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	153023000	USD
CY2014	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2014Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	8447700000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	7722019000	USD
CY2014Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6725906000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6030655000	USD
CY2012	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.036
CY2013	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.033
CY2014	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.033
CY2014	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	3211000	USD
CY2013	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-7417000	USD
CY2013Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	16481000	USD
CY2014Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	35063000	USD
CY2014	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	4940916000	USD
CY2013	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3875460000	USD
CY2012	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3436162000	USD
CY2012Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1034155000	USD
CY2013Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	674374000	USD
CY2013Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1308996000	USD
CY2013Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	857935000	USD
CY2014Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	942718000	USD
CY2014Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	778728000	USD
CY2013Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1255148000	USD
CY2014Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1964322000	USD
CY2013Q3	us-gaap	Regulatory Assets RegulatoryAssets	286748000	USD
CY2014Q3	us-gaap	Regulatory Assets RegulatoryAssets	250309000	USD
CY2014Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	230240000	USD
CY2013Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	273287000	USD
CY2013Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	453581000	USD
CY2014Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	545759000	USD
CY2013Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1123000	USD
CY2014Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4472000	USD
CY2014	us-gaap	Regulatory Noncurrent Asset Amortization Period RegulatoryNoncurrentAssetAmortizationPeriod	P20Y
CY2014	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P15Y
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	131000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	257034000	USD
CY2014Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	917972000	USD
CY2013Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	775267000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	17814000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	19222000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	25531000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	25718	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	39963	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	4113	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	33.42
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	29.83
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	39.00
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	532711	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	473775	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	464438	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	33.44
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	40.48
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	45.05
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	524532	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	657795	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	494308	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	17100000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	21200000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	13000000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	26.32
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	32.20
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	32.67
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	8700000	shares
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	0	shares
CY2014Q1	us-gaap	Share Price SharePrice	44.00
CY2014Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	196695000	USD
CY2013Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	367984000	USD
CY2012	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	13600000	USD
CY2014Q1	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	9200000	shares
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	390205000	USD
CY2014	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	23536000	USD
CY2012	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	17752000	USD
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	15934000	USD
CY2012	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	387991	shares
CY2014	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	12500000	USD
CY2013Q3	us-gaap	Stockholders Equity StockholdersEquity	2580409000	USD
CY2014Q3	us-gaap	Stockholders Equity StockholdersEquity	3086232000	USD
CY2011Q3	us-gaap	Stockholders Equity StockholdersEquity	2255421000	USD
CY2012Q3	us-gaap	Stockholders Equity StockholdersEquity	2359243000	USD
CY2013Q3	us-gaap	Supplies Supplies	5511000	USD
CY2014Q3	us-gaap	Supplies Supplies	5704000	USD
CY2014Q3	us-gaap	Tax Credit Carryforward Deferred Tax Asset TaxCreditCarryforwardDeferredTaxAsset	21614000	USD
CY2013Q3	us-gaap	Tax Credit Carryforward Deferred Tax Asset TaxCreditCarryforwardDeferredTaxAsset	20939000	USD
CY2014	us-gaap	Taxes Other TaxesOther	211936000	USD
CY2013	us-gaap	Taxes Other TaxesOther	187072000	USD
CY2012	us-gaap	Taxes Other TaxesOther	181073000	USD
CY2014Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	77601000	USD
CY2013Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	66960000	USD
CY2013	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	775000	USD
CY2014	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	711000	USD
CY2012	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	793000	USD
CY2014	us-gaap	Unrealized Gain Loss On Price Risk Fair Value Hedging Instruments UnrealizedGainLossOnPriceRiskFairValueHedgingInstruments	9600000	USD
CY2012	us-gaap	Unrealized Gain Loss On Price Risk Fair Value Hedging Instruments UnrealizedGainLossOnPriceRiskFairValueHedgingInstruments	-8000000	USD
CY2013	us-gaap	Unrealized Gain Loss On Price Risk Fair Value Hedging Instruments UnrealizedGainLossOnPriceRiskFairValueHedgingInstruments	9000000	USD
CY2012Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2817000	USD
CY2013Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4158000	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12629000	USD
CY2013Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	411000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4625000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1341000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3846000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8476000	USD
CY2013Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2703000	USD
CY2014	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of estimates</font><font style="font-family:inherit;font-size:10pt;"> — The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. The most significant estimates include the allowance for doubtful accounts, unbilled revenues, legal and environmental accruals, insurance accruals, pension and postretirement obligations, deferred income taxes, asset retirement obligations, impairment of long-lived assets, risk management and trading activities, fair value measurements and the valuation of goodwill and other long-lived assets. Actual results could differ from those estimates.</font></div></div>
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91711000	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	97608000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91172000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	97606000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90150000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90533000	shares
CY2013Q3	ato	Accrued Gas Payable AccruedGasPayable	121202000	USD
CY2014Q3	ato	Accrued Gas Payable AccruedGasPayable	179425000	USD
CY2013	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	0	USD
CY2012	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	0	USD
CY2014	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	0	USD
CY2014Q3	ato	Annual Maximum Investment For Direct Stock Purchase Plan AnnualMaximumInvestmentForDirectStockPurchasePlan	100000	USD
CY2012	ato	Asset Impairment Charges Park City AssetImpairmentChargesParkCity	5300000	USD
CY2013Q3	ato	Asset Retirement Costs In Property Plant And Equipment AssetRetirementCostsInPropertyPlantAndEquipment	3300000	USD
CY2014Q3	ato	Asset Retirement Costs In Property Plant And Equipment AssetRetirementCostsInPropertyPlantAndEquipment	5900000	USD
CY2014Q3	ato	Authorized Commercial Paper AuthorizedCommercialPaper	1250000000	USD
CY2013Q3	ato	Available For Sale Securities Gross Unrealized Gain Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	8706000	USD
CY2014Q3	ato	Available For Sale Securities Gross Unrealized Gain Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments	12160000	USD
CY2013Q3	ato	Available For Sale Securities Gross Unrealized Loss Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments	47000	USD
CY2014Q3	ato	Available For Sale Securities Gross Unrealized Loss Accumulated In Investments AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments	13000	USD
CY2013Q3	ato	Available For Sale Securities Supplemental Executive Benefit Plans AvailableForSaleSecuritiesSupplementalExecutiveBenefitPlans	44500000	USD
CY2014Q3	ato	Available For Sale Securities Supplemental Executive Benefit Plans AvailableForSaleSecuritiesSupplementalExecutiveBenefitPlans	46200000	USD
CY2014	ato	Business License Tax Examination Description BusinessLicenseTaxExaminationDescription	Atmos Energy, through its affiliate, AEM, has been involved in a dispute with the Tennessee Department of Revenue (TDOR) regarding sales business tax audits over a period of several years. The cumulative assessment approximated $12 million as of March 31, 2014, which AEM challenged. We had previously accrued in prior years what we believed to be an adequate amount for the anticipated resolution of this matter. With respect to certain issues, AEM and the TDOR filed competing Partial Motions for Summary Judgment with the Chancery Court. On August 2, 2013, the Chancery Court granted the TDOR's Partial Motion for Summary Judgment and denied AEM's Partial Motion for Summary Judgment. An agreed order of dismissal with prejudice between AEM and TDOR was approved by the Chancery Court and entered on May 2, 2014, whereby AEM agreed to pay $6.2 million to TDOR to resolve all business tax-related liabilities outstanding through September 2014. The State of Tennessee also passed related legislation, effective July 1, 2014, that should help minimize any disputes over this type of sales business tax in the future.
CY2014Q2	ato	Business License Tax Examination Settlement Amount BusinessLicenseTaxExaminationSettlementAmount	6200000	USD
CY2014	ato	Cash Flow Hedge Gain Loss Impacton Earnings CashFlowHedgeGainLossImpactonEarnings	4333000	USD
CY2012	ato	Cash Flow Hedge Gain Loss Impacton Earnings CashFlowHedgeGainLossImpactonEarnings	-66056000	USD
CY2013	ato	Cash Flow Hedge Gain Loss Impacton Earnings CashFlowHedgeGainLossImpactonEarnings	-14170000	USD
CY2014	ato	Cash Flow Hedge Gain Loss Included In Cost Of Sales Net CashFlowHedgeGainLossIncludedInCostOfSalesNet	8563000	USD
CY2012	ato	Cash Flow Hedge Gain Loss Included In Cost Of Sales Net CashFlowHedgeGainLossIncludedInCostOfSalesNet	-64047000	USD
CY2013	ato	Cash Flow Hedge Gain Loss Included In Cost Of Sales Net CashFlowHedgeGainLossIncludedInCostOfSalesNet	-10681000	USD
CY2014	ato	Cash Flow Hedge Gain Loss Reclassifiedto Purchased Gas Cost Net CashFlowHedgeGainLossReclassifiedtoPurchasedGasCostNet	8365000	USD
CY2012	ato	Cash Flow Hedge Gain Loss Reclassifiedto Purchased Gas Cost Net CashFlowHedgeGainLossReclassifiedtoPurchasedGasCostNet	-62678000	USD
CY2013	ato	Cash Flow Hedge Gain Loss Reclassifiedto Purchased Gas Cost Net CashFlowHedgeGainLossReclassifiedtoPurchasedGasCostNet	-10778000	USD
CY2014	ato	Cash Flow Hedge Gain Loss To Be Recassiflied Total CashFlowHedgeGainLossToBeRecassifliedTotal	-29353000	USD
CY2014	ato	Cash Flow Hedge Gain Loss To Be Reclassifed Year Two CashFlowHedgeGainLossToBeReclassifedYearTwo	-1541000	USD
CY2014	ato	Cash Flow Hedge Gain Loss To Be Reclassified After Year Five CashFlowHedgeGainLossToBeReclassifiedAfterYearFive	-23609000	USD
CY2014	ato	Cash Flow Hedge Gain Loss To Be Reclassified Year Five CashFlowHedgeGainLossToBeReclassifiedYearFive	-951000	USD
CY2014	ato	Cash Flow Hedge Gain Loss To Be Reclassified Year Four CashFlowHedgeGainLossToBeReclassifiedYearFour	-974000	USD
CY2014	ato	Cash Flow Hedge Gain Loss To Be Reclassified Year Three CashFlowHedgeGainLossToBeReclassifiedYearThree	-842000	USD
CY2014Q3	ato	Commercial Paper Weighted Average Interest Rate CommercialPaperWeightedAverageInterestRate	0.0023
CY2013Q3	ato	Commercial Paper Weighted Average Interest Rate CommercialPaperWeightedAverageInterestRate	0.0025
CY2013Q3	ato	Common Stock Stated Value Per Share CommonStockStatedValuePerShare	0.005
CY2014Q3	ato	Common Stock Stated Value Per Share CommonStockStatedValuePerShare	0.005
CY2014Q3	ato	Contractual Demand Fees Demand Fees Due Fifth Fiscal Year ContractualDemandFeesDemandFeesDueFifthFiscalYear	143000	USD
CY2014Q3	ato	Contractual Demand Fees Demand Fees Due Fourth Fiscal Year ContractualDemandFeesDemandFeesDueFourthFiscalYear	773000	USD
CY2014Q3	ato	Contractual Demand Fees Demand Fees Due Next Fiscal Year ContractualDemandFeesDemandFeesDueNextFiscalYear	7426000	USD
CY2014Q3	ato	Contractual Demand Fees Demand Fees Due Second Fiscal Year ContractualDemandFeesDemandFeesDueSecondFiscalYear	2117000	USD
CY2014Q3	ato	Contractual Demand Fees Demand Fees Due Thereafter ContractualDemandFeesDemandFeesDueThereafter	214000	USD
CY2014Q3	ato	Contractual Demand Fees Demand Fees Due Third Fiscal Year ContractualDemandFeesDemandFeesDueThirdFiscalYear	1437000	USD
CY2014Q3	ato	Debt And Equity Securities Authorized For Issuance DebtAndEquitySecuritiesAuthorizedForIssuance	1750000000	USD
CY2014Q3	ato	Debt And Equity Securities Available For Issuance DebtAndEquitySecuritiesAvailableForIssuance	845000000	USD
CY2014	ato	Debt Covenant Total Debt To Total Capital Ratio DebtCovenantTotalDebtToTotalCapitalRatio	0.7
CY2014Q3	ato	Deferred Tax Assets Deferred Credits DeferredTaxAssetsDeferredCredits	109000	USD
CY2013Q3	ato	Deferred Tax Assets Deferred Credits DeferredTaxAssetsDeferredCredits	51000	USD
CY2014Q3	ato	Deferred Tax Assets Tax Credit Carryforwards State DeferredTaxAssetsTaxCreditCarryforwardsState	1000000	USD
CY2014Q3	ato	Deferred Tax Liabilities Pension Liability DeferredTaxLiabilitiesPensionLiability	17890000	USD
CY2013Q3	ato	Deferred Tax Liabilities Pension Liability DeferredTaxLiabilitiesPensionLiability	23480000	USD
CY2014	ato	Defined Contribution Employer Contribution Service Period Until Eligibility DefinedContributionEmployerContributionServicePeriodUntilEligibility	P1Y
CY2014Q3	ato	Defined Contribution Plan Percent Of Equity Securities Issued By Employer And Related Parties Included In Plan Assets DefinedContributionPlanPercentOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets	0.045
CY2013Q3	ato	Defined Contribution Plan Percent Of Equity Securities Issued By Employer And Related Parties Included In Plan Assets DefinedContributionPlanPercentOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets	0.049
CY2012	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	246093000	USD
CY2014	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	253987000	USD
CY2013	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	236928000	USD
CY2014Q3	ato	Derivative Cash Collateral DerivativeCashCollateral	25800000	USD
CY2013Q3	ato	Derivative Cash Collateral DerivativeCashCollateral	24800000	USD
CY2014	ato	Description Of Pending Litigation DescriptionOfPendingLitigation	Beginning in April 2009, Atmos Energy and two subsidiaries of AEH, Atmos Energy Marketing, LLC (AEM) and Atmos Gathering Company, LLC (AGC) (collectively, the Atmos Entities), were involved in a lawsuit filed in the Circuit Court of Edmonson County, Kentucky related to our Park City Gathering Project. The dispute which gave rise to the litigation involves the amount of royalties due from a third party producer to landowners (who own the mineral rights) for natural gas produced from the landowners’ properties. The third party producer was operating pursuant to leases between the landowners and certain investors/working interest owners. The third party producer filed a petition in bankruptcy, which was subsequently dismissed due to the lack of meaningful assets to reorganize or liquidate. Although certain Atmos Energy companies entered into contracts with the third party producer to gather, treat and ultimately sell natural gas produced from the landowners’ properties, no Atmos Energy company had a contractual relationship with the landowners or the investors/working interest owners. After the lawsuit was filed, the landowners were successful in terminating for non-payment of royalties the leases related to the production of natural gas from their properties. Subsequent to termination, the investors/working interest owners under such leases filed additional claims against us for the termination of the leases. During the trial, the landowners and the investors/working interest owners requested an award of compensatory damages plus punitive damages against us. On December 17, 2010, the jury returned a verdict in favor of the landowners and investor/working interest owners and awarded compensatory damages of $3.8 million and punitive damages of $27.5 million payable by Atmos Energy and the two AEH subsidiaries. A hearing was held on February 28, 2011 to hear a number of motions, including a motion to dismiss the jury verdict and a motion for a new trial. The motions to dismiss the jury verdict and for a new trial were denied. However, the total punitive damages award was reduced from $27.5 million to $24.7 million. On October 17, 2011, we filed our brief of appellants with the Kentucky Court of Appeals (Court), appealing the verdict of the trial court. The appellees in this case subsequently filed their appellees’ brief with the Court on January 16, 2012, with our reply brief being filed with the Court on March 19, 2012. Oral arguments were held in the case on August 27, 2012. In an opinion handed down on January 25, 2013, the Court of Appeals overturned the $28.5 million jury verdict returned against the Atmos Entities. In a unanimous decision by a three-judge panel, the Court of Appeals reversed the claims asserted by the landowners and investors/working interest owners. The Court of Appeals concluded that all of such claims that the Atmos Entities appealed should have been dismissed by the trial court as a matter of law. The Court of Appeals let stand the jury verdict on one claim that Atmos Energy and our subsidiaries chose not to appeal, which was a trespass claim. The jury had awarded a total of $10,000 in compensatory damages to one landowner on that claim. The Court of Appeals vacated all of the other damages awarded by the jury and remanded the case to the trial court for a new trial, solely on the issue of whether punitive damages should be awarded to that landowner and, if so, in what amount.The investors/working interest owners, on February 25, 2013, and the landowners, on March 19, 2013, each filed with the Supreme Court of Kentucky, separate motions for discretionary review of the opinion of the Court of Appeals. We filed a response to the motion filed by the investors/working owners on March 27, 2013 and to the landowners’ motion on April 17, 2013. The Kentucky Supreme Court denied the motions for discretionary review on February 12, 2014 and the decision of the Court of Appeals became final on February 21, 2014. We had previously accrued what we believed to be an adequate amount for the anticipated resolution of this matter. This accrual was reversed during the second fiscal quarter of fiscal 2014 as the appellate process in this case had been completed. Atmos Energy had also filed a motion with the trial court, the Circuit Court of Edmonson County, Kentucky, on March 10, 2014, seeking a ruling that the remaining landowner was not entitled to any punitive damages on the sole remaining claim of trespass. On May 19, 2014, the Edmonson County Circuit Court entered judgment dismissing any claim for punitive damages relating to the trespass claim. There was no appeal of this judgment. The lawsuit in Edmonson County has now been fully resolved.In addition, in a related matter, on July 12, 2011, the Atmos Entities filed a lawsuit in the United States District Court, Western District of Kentucky, Atmos Energy Corporation et al.vs. Resource Energy Technologies, LLC and Robert Thorpe and John F. Charles, against the third party producer and its affiliates to recover all costs, including attorneys’ fees, incurred by the Atmos Entities, which are associated with the defense and appeal of the case discussed above as well as for all damages awarded to the plaintiffs in such case against the Atmos Entities. The total amount of damages being claimed in the lawsuit is about $3.5 million, plus interest that continues to accrue. This lawsuit is based upon the indemnification provisions agreed to by the third party producer in favor of Atmos Gathering that are contained in an agreement entered into between Atmos Gathering and the third party producer in May 2009. The defendants filed a motion to dismiss the case on August 25, 2011, with Atmos Energy filing a brief in response to such motion on September 19, 2011. On March 27, 2012 the court denied the motion to dismiss. Atmos Energy filed a motion for partial summary judgment against the defendants with the District Court on July 15, 2014 and filed an Amended Complaint on July 18, 2014. On August 28, 2014, the court entered an order authorizing the withdrawal of the lawyer representing the estate of Robert Thorpe, giving the Thorpe Estate until October 2, 2014 to engage a new lawyer. On September 29, 2014, Resource Energy Technologies, LLC and John Charles, individually, entered into an agreed-upon judgment in favor of the Atmos Entities in the amount of $3.6 million, which resolved all claims by the Atmos Entities against those defendants and which dismissed with prejudice all counterclaims against the Atmos Entities. That judgment was settled with the Atmos Entities for $15,000, based on information obtained in discovery that showed those defendants lacked the ability to pay. The only claims remaining in the case are the Atmos Entities’ claims against the Thorpe Estate. The Thorpe Estate has not responded to the motion for partial summary judgment or the amended complaint. In a hearing held on October 7, 2014, the court was advised that the Thorpe Estate was insolvent and without funds to hire another attorney. The court has entered an order to show cause setting the case for a hearing on December 3, 2014 and indicated that if the Thorpe Estate fails to appear, an order of default will be entered.
CY2012	ato	Discontinued Operations Gross Profit DiscontinuedOperationsGrossProfit	51801000	USD
CY2013	ato	Discontinued Operations Gross Profit DiscontinuedOperationsGrossProfit	16498000	USD
CY2013	ato	Discontinued Operations Miscellaneous Income Expense DiscontinuedOperationsMiscellaneousIncomeExpense	548000	USD
CY2013Q1	ato	Loss Contingency Compensatory Damages Awarded Value LossContingencyCompensatoryDamagesAwardedValue	10000	USD
CY2014	ato	Maximum Hedge Percentage Of Anticipated Heating Season Gas MaximumHedgePercentageOfAnticipatedHeatingSeasonGas	0.50
CY2014Q3	ato	Minimum Continuing Investment For Direct Stock Purchase Plan MinimumContinuingInvestmentForDirectStockPurchasePlan	25	USD
CY2012	ato	Investment Tax Credits InvestmentTaxCredits	27000	USD
CY2012Q3	ato	Lease And Rental Expense1 LeaseAndRentalExpense1	33600000	USD
CY2013Q3	ato	Lease And Rental Expense1 LeaseAndRentalExpense1	32400000	USD
CY2014Q3	ato	Lease And Rental Expense1 LeaseAndRentalExpense1	31700000	USD
CY2012	ato	Discontinued Operations Miscellaneous Income Expense DiscontinuedOperationsMiscellaneousIncomeExpense	611000	USD
CY2012	ato	Discontinued Operations Operating Revenues DiscontinuedOperationsOperatingRevenues	114703000	USD
CY2013	ato	Discontinued Operations Operating Revenues DiscontinuedOperationsOperatingRevenues	37962000	USD
CY2013	ato	Discontinued Operations Purchased Gas Cost DiscontinuedOperationsPurchasedGasCost	21464000	USD
CY2012	ato	Discontinued Operations Purchased Gas Cost DiscontinuedOperationsPurchasedGasCost	62902000	USD
CY2014	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	919000	USD
CY2012	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	-1170000	USD
CY2013	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	208000	USD
CY2014	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	-2613000	USD
CY2012	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	-23299000	USD
CY2013	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	-18311000	USD
CY2013	ato	Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax GainLossOnDerivativeInstrumentsNotDesignatedHedgesNetPretax	3000000	USD
CY2012	ato	Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax GainLossOnDerivativeInstrumentsNotDesignatedHedgesNetPretax	-2500000	USD
CY2014	ato	Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax GainLossOnDerivativeInstrumentsNotDesignatedHedgesNetPretax	-5000000	USD
CY2014	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	1900000	USD
CY2013	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	18200000	USD
CY2012	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	23100000	USD
CY2012Q3	ato	Gas Gathering Assets Fair Value Nonrecurring GasGatheringAssetsFairValueNonrecurring	500000	USD
CY2014	ato	Hedge Percentage Of Actual Heating Season Gas HedgePercentageOfActualHeatingSeasonGas	0.32
CY2014	ato	Hedge Volume Of Actual Heating Season Gas HedgeVolumeOfActualHeatingSeasonGas	24800	MMcf
CY2013Q3	ato	Hedged Portion Of Gas Stored Underground Fair Value Disclosure HedgedPortionOfGasStoredUndergroundFairValueDisclosure	44758000	USD
CY2014Q3	ato	Hedged Portion Of Gas Stored Underground Fair Value Disclosure HedgedPortionOfGasStoredUndergroundFairValueDisclosure	40492000	USD
CY2012	ato	Increase Decrease In Other Noncurrent Operating Assets IncreaseDecreaseInOtherNoncurrentOperatingAssets	50055000	USD
CY2014	ato	Increase Decrease In Other Noncurrent Operating Assets IncreaseDecreaseInOtherNoncurrentOperatingAssets	-30662000	USD
CY2013	ato	Increase Decrease In Other Noncurrent Operating Assets IncreaseDecreaseInOtherNoncurrentOperatingAssets	-111069000	USD
CY2012	ato	Increase Decrease In Other Noncurrent Operating Liabilities IncreaseDecreaseInOtherNoncurrentOperatingLiabilities	21424000	USD
CY2013	ato	Increase Decrease In Other Noncurrent Operating Liabilities IncreaseDecreaseInOtherNoncurrentOperatingLiabilities	-96658000	USD
CY2014	ato	Increase Decrease In Other Noncurrent Operating Liabilities IncreaseDecreaseInOtherNoncurrentOperatingLiabilities	-19552000	USD
CY2012	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	1022000	shares
CY2013	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	1178000	shares
CY2014	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	2000	shares
CY2014Q3	ato	Intercompany Payables IntercompanyPayables	0	USD
CY2013Q3	ato	Intercompany Payables IntercompanyPayables	0	USD
CY2014Q3	ato	Intercompany Receivables IntercompanyReceivables	0	USD
CY2013Q3	ato	Intercompany Receivables IntercompanyReceivables	0	USD
CY2014Q3	ato	Investment In Subsidaries InvestmentInSubsidaries	0	USD
CY2013Q3	ato	Investment In Subsidaries InvestmentInSubsidaries	0	USD
CY2013	ato	Investment Tax Credits InvestmentTaxCredits	20000	USD
CY2014	ato	Investment Tax Credits InvestmentTaxCredits	6000	USD
CY2014	ato	Litigation Settlement Judgment Amount LitigationSettlementJudgmentAmount	3600000	USD
CY2014	ato	Litigation Settlement Judgment Amount Settled LitigationSettlementJudgmentAmountSettled	15000	USD
CY2011Q4	ato	Loss Contingency Civil Penalty Paidto Energy Assistance Programs LossContingencyCivilPenaltyPaidtoEnergyAssistancePrograms	5600000	USD
CY2011Q4	ato	Loss Contingency Civil Penalty Paidto United States Treasury LossContingencyCivilPenaltyPaidtoUnitedStatesTreasury	6400000	USD
CY2014	ato	Minimum Hedge Percentage Of Anticipated Heating Season Gas MinimumHedgePercentageOfAnticipatedHeatingSeasonGas	0.25
CY2014	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodNetOfTax	-56287000	USD
CY2013	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodTax	47236000	USD
CY2014Q3	ato	Minimum Initial Investment For Direct Stock Purchase Plan MinimumInitialInvestmentForDirectStockPurchasePlan	1250	USD
CY2014	ato	Minimum Length Of Time Hedged In Cash Flow Hedge MinimumLengthOfTimeHedgedInCashFlowHedge	P0Y1M0D
CY2013	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	12454000	USD
CY2014	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	0	USD
CY2012	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	24420000	USD
CY2014	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	0	USD
CY2013	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	12454000	USD
CY2012	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	24420000	USD
CY2014Q3	ato	Net Open Positions NetOpenPositions	100	MMcf
CY2014	ato	Nonregulated Segment Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate NonregulatedSegmentEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.39
CY2014Q3	ato	Number Of Customers Regulated Distribution NumberOfCustomersRegulatedDistribution	3000000	customers
CY2014Q3	ato	Number Of Divisions Regulated Distribution NumberOfDivisionsRegulatedDistribution	6	regulated_gas_distributions_divisions
CY2014Q3	ato	Numberof Credit Facilities NumberofCreditFacilities	4	credit_facility
CY2013	ato	Other Comprehensive Income Loss Commodity Cash Flow Hedges Net Of Tax OtherComprehensiveIncomeLossCommodityCashFlowHedgesNetOfTax	4519000	USD
CY2012	ato	Other Comprehensive Income Loss Commodity Cash Flow Hedges Net Of Tax OtherComprehensiveIncomeLossCommodityCashFlowHedgesNetOfTax	7866000	USD
CY2014	ato	Other Comprehensive Income Loss Commodity Cash Flow Hedges Net Of Tax OtherComprehensiveIncomeLossCommodityCashFlowHedgesNetOfTax	2802000	USD
CY2012	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodNetOfTax	-10116000	USD
CY2013	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodNetOfTax	82179000	USD
CY2012	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodTax	-5388000	USD
CY2014	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodTax	-32353000	USD
CY2014	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	-5102000	USD
CY2013	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	6576000	USD
CY2013	ato	Other Comprehensive Income Reclassification Adjustment On Interest Rate Agreements Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnInterestRateAgreementsIncludedInNetIncomeNetOfTax	2216000	USD
CY2014	ato	Other Comprehensive Income Reclassification Adjustment On Interest Rate Agreements Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnInterestRateAgreementsIncludedInNetIncomeNetOfTax	2686000	USD
CY2013	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	-2057000	USD
CY2014	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	7904000	USD
CY2014	ato	Other Comprehensive Income Unrealized Gain Loss On Interest Rate Agreements Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnInterestRateAgreementsArisingDuringPeriodNetOfTax	-58973000	USD
CY2013	ato	Other Comprehensive Income Unrealized Gain Loss On Interest Rate Agreements Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnInterestRateAgreementsArisingDuringPeriodNetOfTax	79963000	USD
CY2013Q3	ato	Other Liabilities Current Other OtherLiabilitiesCurrentOther	10954000	USD
CY2014Q3	ato	Other Liabilities Current Other OtherLiabilitiesCurrentOther	17467000	USD
CY2014Q3	ato	Other Liabilities Noncurrent Other OtherLiabilitiesNoncurrentOther	23881000	USD
CY2013Q3	ato	Other Liabilities Noncurrent Other OtherLiabilitiesNoncurrentOther	17953000	USD
CY2012	ato	Payments To Repurchase Common Stock PaymentsToRepurchaseCommonStock	12535000	USD
CY2014	ato	Payments To Repurchase Common Stock PaymentsToRepurchaseCommonStock	0	USD
CY2013	ato	Payments To Repurchase Common Stock PaymentsToRepurchaseCommonStock	0	USD
CY2013Q3	ato	Property Plant And Equipment Excluding Cip Gross PropertyPlantAndEquipmentExcludingCipGross	7446272000	USD
CY2014Q3	ato	Property Plant And Equipment Excluding Cip Gross PropertyPlantAndEquipmentExcludingCipGross	8200121000	USD
CY2013Q3	ato	Public Utilities Plantand Equipment Amountof Acquisition Adjustmentsand Related Accumulated Depreciation PublicUtilitiesPlantandEquipmentAmountofAcquisitionAdjustmentsandRelatedAccumulatedDepreciation	83800000	USD
CY2014Q3	ato	Public Utilities Plantand Equipment Amountof Acquisition Adjustmentsand Related Accumulated Depreciation PublicUtilitiesPlantandEquipmentAmountofAcquisitionAdjustmentsandRelatedAccumulatedDepreciation	76400000	USD
CY2013	ato	Purchased Gas Cost PurchasedGasCost	2463410000	USD
CY2014	ato	Purchased Gas Cost PurchasedGasCost	3358490000	USD
CY2012	ato	Purchased Gas Cost PurchasedGasCost	2112423000	USD
CY2014Q3	ato	Ratio Of Total Debt To Total Capital RatioOfTotalDebtToTotalCapital	0.48
CY2014Q3	ato	Segment Reporting Information Other Current Liabilities SegmentReportingInformationOtherCurrentLiabilities	712225000	USD
CY2013Q3	ato	Segment Reporting Information Other Current Liabilities SegmentReportingInformationOtherCurrentLiabilities	608959000	USD
CY2014Q3	ato	Segment Reporting Information Other Noncurrent Assets SegmentReportingInformationOtherNoncurrentAssets	337891000	USD
CY2013Q3	ato	Segment Reporting Information Other Noncurrent Assets SegmentReportingInformationOtherNoncurrentAssets	375763000	USD
CY2014Q3	ato	Segment Reporting Information Other Noncurrent Liabilities SegmentReportingInformationOtherNoncurrentLiabilities	48744000	USD
CY2014	ato	Regulated Segments Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate RegulatedSegmentsEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.37
CY2013Q3	ato	Regulatory Asset Future Recoverable Pension Costs RegulatoryAssetFutureRecoverablePensionCosts	17400000	USD
CY2014Q3	ato	Regulatory Asset Future Recoverable Pension Costs RegulatoryAssetFutureRecoverablePensionCosts	18800000	USD
CY2013Q3	ato	Regulatory Cost Of Removal Liability RegulatoryCostOfRemovalLiability	359299000	USD
CY2014Q3	ato	Regulatory Cost Of Removal Liability RegulatoryCostOfRemovalLiability	445387000	USD
CY2013Q3	ato	Regulatory Cost Of Removal Liability Current RegulatoryCostOfRemovalLiabilityCurrent	68225000	USD
CY2014Q3	ato	Regulatory Cost Of Removal Liability Current RegulatoryCostOfRemovalLiabilityCurrent	45061000	USD
CY2014Q3	ato	Regulatory Cost Of Removal Obligation RegulatoryCostOfRemovalObligation	445387000	USD
CY2013Q3	ato	Regulatory Cost Of Removal Obligation RegulatoryCostOfRemovalObligation	359299000	USD
CY2014	ato	Repurchase Of Equity Awards RepurchaseOfEquityAwards	8717000	USD
CY2013	ato	Repurchase Of Equity Awards RepurchaseOfEquityAwards	5150000	USD
CY2012	ato	Repurchase Of Equity Awards RepurchaseOfEquityAwards	5219000	USD
CY2012	ato	Repurchase Of Equity Awards Value RepurchaseOfEquityAwardsValue	5219000	USD
CY2014	ato	Repurchase Of Equity Awards Value RepurchaseOfEquityAwardsValue	8717000	USD
CY2013	ato	Repurchase Of Equity Awards Value RepurchaseOfEquityAwardsValue	5150000	USD
CY2014Q1	ato	Shares Issued At Overallotment Option SharesIssuedAtOverallotmentOption	1200000	shares
CY2012	ato	Stock Issued During Period Value Direct Stock Purchase Plan StockIssuedDuringPeriodValueDirectStockPurchasePlan	-65000	USD
CY2014	ato	Stock Issued During Period Value Direct Stock Purchase Plan StockIssuedDuringPeriodValueDirectStockPurchasePlan	4067000	USD
CY2013	ato	Stock Issued During Period Value Direct Stock Purchase Plan StockIssuedDuringPeriodValueDirectStockPurchasePlan	-50000	USD
CY2013	ato	Stock Issued During Period Value Directors Stock For Fee Plan StockIssuedDuringPeriodValueDirectorsStockForFeePlan	80000	USD
CY2012	ato	Stock Issued During Period Value Directors Stock For Fee Plan StockIssuedDuringPeriodValueDirectorsStockForFeePlan	78000	USD
CY2014	ato	Schedule Of Divisions And Service Areas ScheduleOfDivisionsAndServiceAreas	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Through our regulated distribution business, we deliver natural gas through sales and transportation arrangements to over </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">three million</font><font style="font-family:inherit;font-size:10pt;"> residential, commercial, public-authority and industrial customers through our </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">six</font><font style="font-family:inherit;font-size:10pt;"> regulated distribution divisions in the service areas described below:</font></div><div style="line-height:120%;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3" rowspan="1"></td></tr><tr><td width="48%" rowspan="1" colspan="1"></td><td width="4%" rowspan="1" colspan="1"></td><td width="48%" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Service Area</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Colorado-Kansas Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Colorado, Kansas</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Kentucky/Mid-States Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Kentucky, Tennessee, Virginia</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">(1)</sup></font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Louisiana Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Louisiana</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Mid-Tex Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Texas, including the Dallas/Fort Worth metropolitan area</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy Mississippi Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Mississippi</font></div></td></tr><tr><td style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Atmos Energy West Texas Division</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">  </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">West Texas</font></div></td></tr></table></div><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:33px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:9px;"><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">(1)</sup> </font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Denotes location where we have more limited service areas.</font></div></td></tr></table></div>
CY2013Q3	ato	Segment Reporting Information Other Noncurrent Liabilities SegmentReportingInformationOtherNoncurrentLiabilities	37563000	USD
CY2014	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Beginning Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberBeginningBalance	1052844	shares
CY2012	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Beginning Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberBeginningBalance	1264142	shares
CY2013	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Beginning Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberBeginningBalance	1262582	shares
CY2014	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Ending Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberEndingBalance	988637	shares
CY2014Q3	ato	Segment Reporting Information Other Current Assets SegmentReportingInformationOtherCurrentAssets	687755000	USD
CY2013Q3	ato	Segment Reporting Information Other Current Assets SegmentReportingInformationOtherCurrentAssets	598968000	USD
CY2014	ato	Stock Issued During Period Value Directors Stock For Fee Plan StockIssuedDuringPeriodValueDirectorsStockForFeePlan	81000	USD
CY2012	ato	Stock Issued During Period Value Long Term Incentive Plan StockIssuedDuringPeriodValueLongTermIncentivePlan	12037000	USD
CY2013	ato	Stock Issued During Period Value Long Term Incentive Plan StockIssuedDuringPeriodValueLongTermIncentivePlan	8788000	USD
CY2013	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Ending Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberEndingBalance	1052844	shares
CY2012	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Ending Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberEndingBalance	1262582	shares
CY2014	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Beginning Of Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueBeginningOfPeriod	36.20
CY2012	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Beginning Of Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueBeginningOfPeriod	29.56
CY2013	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Beginning Of Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueBeginningOfPeriod	32.46
CY2014	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value End Of Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueEndOfPeriod	42.22
CY2012	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value End Of Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueEndOfPeriod	32.46
CY2013	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value End Of Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueEndOfPeriod	36.20
CY2014Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailable	845139	shares
CY2012	ato	Share Repurchases Amount ShareRepurchasesAmount	12535000	USD
CY2014	ato	Stock Issued During Period Value Long Term Incentive Plan StockIssuedDuringPeriodValueLongTermIncentivePlan	4353000	USD
CY2014Q3	ato	Total Estimated Contractual Demand Fees TotalEstimatedContractualDemandFees	12110000	USD
CY2013	ato	Total Unrecognized In Net Periodic Pension Cost TotalUnrecognizedInNetPeriodicPensionCost	170624000	USD
CY2014	ato	Total Unrecognized In Net Periodic Pension Cost TotalUnrecognizedInNetPeriodicPensionCost	144004000	USD
CY2013	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	42000	USD
CY2014	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	0	USD
CY2012	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	101000	USD
CY2013	ato	Unrecognized Actuarial Lossin Regulatory Assets UnrecognizedActuarialLossinRegulatoryAssets	176048000	USD
CY2014	ato	Unrecognized Actuarial Lossin Regulatory Assets UnrecognizedActuarialLossinRegulatoryAssets	151745000	USD
CY2014	ato	Unrecognized Prior Service Costin Regulatory Assets UnrecognizedPriorServiceCostinRegulatoryAssets	-8095000	USD
CY2013	ato	Unrecognized Prior Service Costin Regulatory Assets UnrecognizedPriorServiceCostinRegulatoryAssets	-6052000	USD
CY2013Q3	ato	Unrecognized Tax Benefits Deferred Federaland State Income Tax Benefits UnrecognizedTaxBenefitsDeferredFederalandStateIncomeTaxBenefits	1455000	USD
CY2014Q3	ato	Unrecognized Tax Benefits Deferred Federaland State Income Tax Benefits UnrecognizedTaxBenefitsDeferredFederalandStateIncomeTaxBenefits	4564000	USD
CY2013Q3	ato	Unrecognized Tax Benefits Gross UnrecognizedTaxBenefitsGross	4158000	USD
CY2014Q3	ato	Unrecognized Tax Benefits Gross UnrecognizedTaxBenefitsGross	13040000	USD
CY2013	ato	Unrecognized Transition Obligation In Regulatory Assets UnrecognizedTransitionObligationInRegulatoryAssets	628000	USD
CY2014	ato	Unrecognized Transition Obligation In Regulatory Assets UnrecognizedTransitionObligationInRegulatoryAssets	354000	USD
CY2014	ato	Weighted Average Cost Of Actual Heating Season Gas WeightedAverageCostOfActualHeatingSeasonGas	4.02
CY2012	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	91172000	shares
CY2013	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	91711000	shares
CY2014	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	97608000	shares
CY2014	dei	Amendment Flag AmendmentFlag	false
CY2014	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2014	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2014	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2014
CY2014	dei	Document Period End Date DocumentPeriodEndDate	2014-09-30
CY2014	dei	Document Type DocumentType	10-K
CY2014	dei	Entity Central Index Key EntityCentralIndexKey	0000731802
CY2014Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	100393038	shares
CY2014	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2014	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2014Q1	dei	Entity Public Float EntityPublicFloat	4659809695	USD
CY2014	dei	Entity Registrant Name EntityRegistrantName	Atmos Energy Corporation
CY2014	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2014	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000731802-14-000034-index-headers.html	Edgar Link	pending
0000731802-14-000034-index.html	Edgar Link	pending
0000731802-14-000034.txt	Edgar Link	pending
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ato-20140930.xml	Edgar Link	completed
ato-20140930.xsd	Edgar Link	pending
ato-20140930_cal.xml	Edgar Link	unprocessable
ato-20140930_def.xml	Edgar Link	unprocessable
ato-20140930_lab.xml	Edgar Link	unprocessable
ato-20140930_pre.xml	Edgar Link	unprocessable
ato2014093010-k.htm	Edgar Link	pending
ato20140930ex-1013a.htm	Edgar Link	pending
ato20140930ex-1013b.htm	Edgar Link	pending
ato20140930ex-1013c.htm	Edgar Link	pending
ato20140930ex-12.htm	Edgar Link	pending
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ato20140930ex-231.htm	Edgar Link	pending
ato20140930ex-31.htm	Edgar Link	pending
ato20140930ex-32.htm	Edgar Link	pending
ato2014093_chart-57386.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$ATO
Atmos Energy Corp Stock $ato

2014 Q3 Form 10-K Financial Statement

#000073180214000034 Filed on November 06, 2014

Income Statement

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$ATO Atmos Energy Corp Stock $ato

2014 Q3 Form 10-K Financial Statement

#000073180214000034 Filed on November 06, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATO
Atmos Energy Corp Stock $ato