$ATO
ATMOS ENERGY CORP Stock $ato

$ato Overview Financials Valuation SEC Filings Company Website

2012 Q3 Form 10-Q Financial Statement

#000119312512346532 Filed on August 09, 2012

Income Statement

Concept	2012 Q3	2012 Q2	2011 Q2
Revenue	$552.6M	$576.4M	$833.2M
YoY Change	-29.13%	-30.82%	9.44%
Cost Of Revenue	$300.9M	$19.53M	$576.8M
YoY Change	-45.01%	-96.61%	11.56%
Gross Profit	$249.4M	$293.2M	$261.6M
YoY Change	5.16%	12.06%	5.63%
Gross Profit Margin	45.13%	50.86%	31.4%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$62.20M	$61.40M	$58.40M
YoY Change	1.14%	5.14%	9.57%
% of Gross Profit	24.94%	20.94%	22.32%
Operating Expenses	$221.3M	$211.6M	$232.7M
YoY Change	10.26%	-9.07%	8.04%
Operating Profit	$22.79M	$81.55M	$31.39M
YoY Change	-41.85%	159.75%	-2.68%
Interest Expense	-$33.90M	$34.91M	$35.85M
YoY Change	-11.26%	-2.61%	-3.82%
% of Operating Profit	-148.74%	42.81%	114.18%
Other Income/Expense, Net	-$11.10M	-$2.075M	-$1.430M
YoY Change	344.0%	45.1%	79.2%
Pretax Income	-$22.20M	$44.56M	-$3.197M
YoY Change	-3800.0%	-1493.87%	-44.94%
Income Tax	-$21.90M	$16.55M	-$1.723M
% Of Pretax Income		37.13%
Net Earnings	$7.967M	$31.13M	-$566.0K
YoY Change	306.27%	-5600.35%	-82.05%
Net Earnings / Revenue	1.44%	5.4%	-0.07%
Basic Earnings Per Share	$0.09	$0.34	-$0.01
Diluted Earnings Per Share	$0.09	$0.34	-$0.01
COMMON SHARES
Basic Shares Outstanding	90.17M shares	90.12M shares	90.13M shares
Diluted Shares Outstanding		90.99M shares	90.13M shares

Balance Sheet

Concept	2012 Q3	2012 Q2	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$128.6M	$28.00M	$117.0M
YoY Change	-30.11%	-76.07%	-35.0%
Cash & Equivalents	$64.24M	$27.71M	$117.4M
Short-Term Investments	$64.40M
Other Short-Term Assets	$272.8M	$291.9M	$273.5M
YoY Change	-13.81%	6.73%	110.35%
Inventory	$256.0M	$239.0M	$257.0M
Prepaid Expenses	$17.11M
Receivables	$234.5M	$216.8M	$342.1M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$828.0M	$775.7M	$989.7M
YoY Change	-18.1%	-21.63%	13.25%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.476B	$5.442B	$4.916B
YoY Change	6.37%	10.7%	5.29%
Goodwill	$740.7M
YoY Change	0.09%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$451.3M	$392.1M	$348.0M
YoY Change	17.58%	12.68%	14.83%
Total Long-Term Assets	$6.668B	$6.574B	$6.004B
YoY Change	6.31%	9.5%	5.11%
TOTAL ASSETS
Total Short-Term Assets	$828.0M	$775.7M	$989.7M
Total Long-Term Assets	$6.668B	$6.574B	$6.004B
Total Assets	$7.496B	$7.350B	$6.993B
YoY Change	2.92%	5.1%	6.19%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$215.0M	$178.0M	$312.0M
YoY Change	-26.12%	-42.95%	22.83%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$570.9M	$213.5M	$0.00
YoY Change	176.62%
Long-Term Debt Due	$131.0K	$250.1M	$2.434M
YoY Change	-94.62%	10176.54%	-99.32%
Total Short-Term Liabilities	$1.276B	$1.110B	$648.3M
YoY Change	47.07%	71.26%	-35.67%
LONG-TERM LIABILITIES
Long-Term Debt	$1.956B	$1.956B	$2.206B
YoY Change	-11.32%	-11.32%	21.91%
Other Long-Term Liabilities	$50.73M	$460.9M	$439.5M
YoY Change	-91.02%	4.89%	14.38%
Total Long-Term Liabilities	$2.007B	$2.417B	$2.646B
YoY Change	-27.57%	-8.63%	20.6%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.276B	$1.110B	$648.3M
Total Long-Term Liabilities	$2.007B	$2.417B	$2.646B
Total Liabilities	$3.283B	$3.527B	$3.294B
YoY Change	-9.77%	7.09%	2.88%
SHAREHOLDERS EQUITY
Retained Earnings	$660.9M	$684.9M	$599.5M
YoY Change	15.85%	14.25%	16.24%
Common Stock	$1.746B	$1.737B	$1.731B
YoY Change	0.72%	0.4%	-4.52%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.359B	$2.355B	$2.336B
YoY Change
Total Liabilities & Shareholders Equity	$7.496B	$7.350B	$6.993B
YoY Change	2.92%	5.1%	6.19%

Cashflow Statement

Concept	2012 Q3	2012 Q2	2011 Q2
OPERATING ACTIVITIES
Net Income	$7.967M	$31.13M	-$566.0K
YoY Change	306.27%	-5600.35%	-82.05%
Depreciation, Depletion And Amortization	$62.20M	$61.40M	$58.40M
YoY Change	1.14%	5.14%	9.57%
Cash From Operating Activities	$68.10M	$158.1M	$81.10M
YoY Change	7.75%	94.94%	-27.0%
INVESTING ACTIVITIES
Capital Expenditures	-$235.5M	-$186.3M	-$143.6M
YoY Change	1.2%	29.74%	10.72%
Acquisitions
YoY Change
Other Investing Activities	$127.8M	-$300.0K	-$1.900M
YoY Change	-12880.0%	-84.21%	-480.0%
Cash From Investing Activities	-$107.7M	-$186.6M	-$145.5M
YoY Change	-53.92%	28.25%	12.62%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	76.10M	9.200M	28.60M
YoY Change	-58.73%	-67.83%	-187.46%
NET CHANGE
Cash From Operating Activities	68.10M	158.1M	81.10M
Cash From Investing Activities	-107.7M	-186.6M	-145.5M
Cash From Financing Activities	76.10M	9.200M	28.60M
Net Change In Cash	36.50M	-19.30M	-35.80M
YoY Change	162.59%	-46.09%	-29.53%
FREE CASH FLOW
Cash From Operating Activities	$68.10M	$158.1M	$81.10M
Capital Expenditures	-$235.5M	-$186.3M	-$143.6M
Free Cash Flow	$303.6M	$344.4M	$224.7M
YoY Change	2.6%	53.27%	-6.69%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Registrant Name EntityRegistrantName	Atmos Energy Corporation
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2012Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	90173217	shares
CY2012Q2	dei	Entity Public Float EntityPublicFloat	2764486845	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0000731802
	dei	Document Period End Date DocumentPeriodEndDate	2012-06-30
CY2012Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	7128484000	USD
CY2012Q2	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1686598000	USD
CY2012Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5441886000	USD
CY2012Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	27706000	USD
CY2012Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	216753000	USD
CY2012Q2	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	239329000	USD
CY2012Q2	us-gaap	Other Assets Current OtherAssetsCurrent	291870000	USD
CY2012Q2	us-gaap	Assets Current AssetsCurrent	775658000	USD
CY2012Q2	ato	Goodwill And Intangible Assets GoodwillAndIntangibleAssets	740174000	USD
CY2012Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	392117000	USD
CY2012Q2	us-gaap	Assets Assets	7349835000	USD
CY2012Q2	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1737047000	USD
CY2012Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	684907000	USD
CY2012Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-67480000	USD
CY2012Q2	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	178198000	USD
CY2012Q2	ato	Common Stock Stated Value Per Share CommonStockStatedValuePerShare	0.005
CY2012Q2	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	468409000	USD
CY2012Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	213491000	USD
CY2012Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	250131000	USD
CY2012Q2	us-gaap	Liabilities Current LiabilitiesCurrent	1110229000	USD
CY2012Q2	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1085654000	USD
CY2012Q2	ato	Regulatory Cost Of Removal Liability RegulatoryCostOfRemovalLiability	381797000	USD
CY2012Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	460941000	USD
CY2012Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7349835000	USD
CY2012Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.000
CY2012Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2011Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	6816794000	USD
CY2011Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5147918000	USD
CY2011Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1668876000	USD
CY2011Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	131419000	USD
CY2011Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	273303000	USD
CY2011Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	289760000	USD
CY2011Q3	us-gaap	Other Assets Current OtherAssetsCurrent	316471000	USD
CY2011Q3	us-gaap	Assets Current AssetsCurrent	1010953000	USD
CY2011Q3	ato	Goodwill And Intangible Assets GoodwillAndIntangibleAssets	740207000	USD
CY2011Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	383793000	USD
CY2011Q3	us-gaap	Assets Assets	7282871000	USD
CY2011Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1732935000	USD
CY2011Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	570495000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-48460000	USD
CY2011Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	291205000	USD
CY2011Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	367563000	USD
CY2011Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	206396000	USD
CY2011Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	2434000	USD
CY2011Q3	us-gaap	Liabilities Current LiabilitiesCurrent	867598000	USD
CY2011Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	960093000	USD
CY2011Q3	ato	Regulatory Cost Of Removal Liability RegulatoryCostOfRemovalLiability	428947000	USD
CY2011Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	564695000	USD
CY2011Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7282871000	USD
CY2011Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.000
CY2011Q3	ato	Common Stock Stated Value Per Share CommonStockStatedValuePerShare	0.005
CY2011Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2011Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	90296482	shares
CY2011Q3	us-gaap	Stockholders Equity StockholdersEquity	2255421000	USD
CY2011Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2206117000	USD
CY2011Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	4461538000	USD
CY2012Q2	us-gaap	Stockholders Equity StockholdersEquity	2354925000	USD
CY2012Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1956289000	USD
CY2012Q2	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	4311214000	USD
CY2012Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	90172665	shares
CY2012Q2	us-gaap	Common Stock Value CommonStockValue	451000	USD
CY2011Q3	us-gaap	Common Stock Value CommonStockValue	451000	USD
CY2012Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	585831000	USD
CY2011Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	843615000	USD
CY2012Q2	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	287041000	USD
CY2011Q2	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	576810000	USD
CY2012Q2	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	107295000	USD
CY2012Q2	us-gaap	Depreciation And Amortization DepreciationAndAmortization	59819000	USD
CY2012Q2	us-gaap	Taxes Other TaxesOther	46887000	USD
CY2012Q2	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2012Q2	us-gaap	Operating Expenses OperatingExpenses	214001000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	84789000	USD
CY2012Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1948000	USD
CY2012Q2	us-gaap	Interest Expense InterestExpense	34923000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	47918000	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17774000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	30144000	USD
CY2012Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	988000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	31132000	USD
CY2011Q2	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	112665000	USD
CY2011Q2	us-gaap	Depreciation And Amortization DepreciationAndAmortization	56932000	USD
CY2011Q2	us-gaap	Taxes Other TaxesOther	52142000	USD
CY2011Q2	us-gaap	Asset Impairment Charges AssetImpairmentCharges	10988000	USD
CY2011Q2	us-gaap	Operating Expenses OperatingExpenses	232727000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	34078000	USD
CY2011Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1430000	USD
CY2011Q2	us-gaap	Interest Expense InterestExpense	35845000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-3197000	USD
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CY2011Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	908000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	-566000	USD
CY2011Q2	us-gaap	Gross Profit GrossProfit	266805000	USD
CY2012Q2	us-gaap	Gross Profit GrossProfit	298790000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.33
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
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CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2012Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.345
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90118000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	90993000	shares
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.02
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.01
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.02
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
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CY2011Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.340
CY2011Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90127000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	90127000	shares
CY2012Q2	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	566000	USD
CY2011Q2	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	590000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	2930454000	USD
	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	1834521000	USD
	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	2473177000	USD
	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3558374000	USD
	us-gaap	Gross Profit GrossProfit	1095933000	USD
	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	334065000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	179306000	USD
	us-gaap	Taxes Other TaxesOther	145004000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
	us-gaap	Operating Expenses OperatingExpenses	658375000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	437558000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3207000	USD
	us-gaap	Interest Expense InterestExpense	107025000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	327326000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	125484000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	201842000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	6908000	USD
	us-gaap	Net Income Loss NetIncomeLoss	208750000	USD
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.21
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.07
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.28
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.035
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90131000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91006000	shares
	us-gaap	Gross Profit GrossProfit	1085197000	USD
	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	341317000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	167176000	USD
	us-gaap	Taxes Other TaxesOther	145868000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	30270000	USD
	us-gaap	Operating Expenses OperatingExpenses	684631000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	400566000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	24046000	USD
	us-gaap	Interest Expense InterestExpense	112615000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	311997000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	114211000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	197786000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	7854000	USD
	us-gaap	Net Income Loss NetIncomeLoss	205640000	USD
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.17
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.09
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.26
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.16
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.09
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.25
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.020
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90233000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	90530000	shares
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.23
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.31
	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	3959000	USD
	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Discontinued Operation During Phase Out Period DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	5122000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	310000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	149000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	120713000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	115488000	USD
	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	12759000	USD
	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	-15869000	USD
	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	29996000	USD
	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	3769000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	518806000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	519562000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	497374000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	390283000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4247000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3373000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-501621000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-393656000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-6688000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-132072000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	27803000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	360066000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2369000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	94338000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	93039000	USD
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	5219000	USD
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	5300000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	251000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	7548000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-120898000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-140429000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-103713000	USD
CY2010Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	131952000	USD
CY2011Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	117429000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-14523000	USD
	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	183884000	USD
	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	171726000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	22386000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	15927000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	12535000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	394618000	USD
	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	0	USD
	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	-20079000	USD
	us-gaap	Nature Of Operations NatureOfOperations	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:12pt;font-weight:bold;margin-left:0px;">1. Nature of Business</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:12pt;margin-left:0px;">Atmos Energy Corporation </font><font style="font-family:Times New Roman;font-size:12pt;">(“Atmos Energy” or the “Company”) </font><font style="font-family:Times New Roman;font-size:12pt;">and our subsidiaries are engaged primarily in the regulated natural gas distribution and transmission and storage businesses as well as certain other nonregulated businesses. </font><font style="font-family:Times New Roman;font-size:12pt;">Our corporate headquarters and shared-services function are located in </font><font style="font-family:Times New Roman;font-size:12pt;">Dallas</font><font style="font-family:Times New Roman;font-size:12pt;">, </font><font style="font-family:Times New Roman;font-size:12pt;">Texas</font><font style="font-family:Times New Roman;font-size:12pt;"> and our customer support centers are located in </font><font style="font-family:Times New Roman;font-size:12pt;">Amarillo</font><font style="font-family:Times New Roman;font-size:12pt;"> and </font><font style="font-family:Times New Roman;font-size:12pt;">Waco</font><font style="font-family:Times New Roman;font-size:12pt;">, </font><font style="font-family:Times New Roman;font-size:12pt;">Texas</font><font style="font-family:Times New Roman;font-size:12pt;">. </font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:12pt;margin-left:0px;">Through our natural gas distribution business, we deliver natural gas through sales and transportation arrangements to over three million residential, commercial, public authority and industrial customers through our six regulated natural gas distribution divisions</font><font style="font-family:Times New Roman;font-size:12pt;">,</font><font style="font-family:Times New Roman;font-size:12pt;"> which</font><font style="font-family:Times New Roman;font-size:12pt;"> at June 30, 2012 covered </font><font style="font-family:Times New Roman;font-size:12pt;">service areas located in </font><font style="font-family:Times New Roman;font-size:12pt;">12</font><font style="font-family:Times New Roman;font-size:12pt;"> states. In addition, we transport natural gas for others through our distribution system. </font><font style="font-family:Times New Roman;font-size:12pt;">On August 1, 2012</font><font style="font-family:Times New Roman;font-size:12pt;">, we </font><font style="font-family:Times New Roman;font-size:12pt;">completed the divestiture of ou</font><font style="font-family:Times New Roman;font-size:12pt;">r</font><font style="font-family:Times New Roman;font-size:12pt;"> </font><font style="font-family:Times New Roman;font-size:12pt;">natural gas</font><font style="font-family:Times New Roman;font-size:12pt;"> </font><font style="font-family:Times New Roman;font-size:12pt;">distribution operations in Missouri, Illinois and Iowa, representing approximately 84,000 customers.</font><font style="font-family:Times New Roman;font-size:12pt;"> </font><font style="font-family:Times New Roman;font-size:12pt;">On August </font><font style="font-family:Times New Roman;font-size:12pt;">8</font><font style="font-family:Times New Roman;font-size:12pt;">, 2012, we announced that we had entered into a definitive agreement to sell our natural gas distribution operations in Georgia, representing approximately </font><font style="font-family:Times New Roman;font-size:12pt;">64,000</font><font style="font-family:Times New Roman;font-size:12pt;"> customers. </font><font style="font-family:Times New Roman;font-size:12pt;">Our</font><font style="font-family:Times New Roman;font-size:12pt;"> </font><font style="font-family:Times New Roman;font-size:12pt;">regulated activities also include our regulated pipeline and storage operations, which include the transportation of natural gas to our distribution system and the management of our underground storage facilities. Our regulated businesses are subject to federal and state regulation and/or regulation by local authorities in each of the states in which our natural gas distribution divisions operate. </font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:12pt;margin-left:0px;">Our nonregulated businesses operate primarily in the </font><font style="font-family:Times New Roman;font-size:12pt;">Midwest</font><font style="font-family:Times New Roman;font-size:12pt;"> and Southeast through various wholly-owned subsidiaries of Atmos Energy Holdings, Inc</font><font style="font-family:Times New Roman;font-size:12pt;">.</font><font style="font-family:Times New Roman;font-size:12pt;">, (AEH). AEH is wholly owned by the Company and </font><font style="font-family:Times New Roman;font-size:12pt;">headquartered</font><font style="font-family:Times New Roman;font-size:12pt;"> in Houston, Texas. Through AEH, we provide natural gas management and transportation services to municipalities, natural gas distribution companies, including certain divisions of Atmos Energy and third parties. AEH also seeks to maximize, through asset optimization activities, the economic value associated with storage and transportation capacity it owns or controls. Certain of these arrangements are with regulated affiliates of the Company, which have been approved by applicable state regulatory commissions. </font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:12pt;margin-left:0px;">W</font><font style="font-family:Times New Roman;font-size:12pt;">e operate the Company through the following three segments: </font></p><p style='margin-top:5pt; margin-bottom:5pt'></p><ul><li style="margin-left:36px;list-style:disc;"><font style="font-family:Times New Roman;font-size:12pt;">the </font><font style="font-family:Times New Roman;font-size:12pt;font-style:italic;">natural gas distribution segment</font><font style="font-family:Times New Roman;font-size:12pt;">, which includes our regulated natural gas distribution and related sales operations,</font></li><li style="margin-left:36px;list-style:disc;"><font style="font-family:Times New Roman;font-size:12pt;">the </font><font style="font-family:Times New Roman;font-size:12pt;font-style:italic;">regulated transmission and storage segment</font><font style="font-family:Times New Roman;font-size:12pt;">, which includes the regulated pipeline and storage operations of our Atmos Pipeline — Texas Division and</font></li><li style="margin-left:36px;list-style:disc;"><font style="font-family:Times New Roman;font-size:12pt;">the </font><font style="font-family:Times New Roman;font-size:12pt;font-style:italic;">nonregulated segment</font><font style="font-family:Times New Roman;font-size:12pt;">, which includes our nonregulated natural gas management, nonregulated natural gas transmission, storage and other services.</font></li></ul><p style='margin-top:0pt; margin-bottom:0pt'> </p>
CY2012Q2	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	12	pure
	us-gaap	Subsequent Event Description SubsequentEventDescription	On July 27, 2012, we issued a notice of redemption of our Unsecured 5.125% Senior Notes on August 28, 2012. The redemption is discussed further in Note 6. On August 1, 2012, we completed the sale of our Missouri, Illinois and Iowa natural gas distribution assets. The sale is discussed in Note 5. On August 8, 2012 we announced that we had entered into a definitive agreement to sell our natural gas distribution operations in Georgia, which is discussed in Note 5.
CY2011Q3	us-gaap	Regulatory Assets RegulatoryAssets	312896000	USD
CY2012Q2	us-gaap	Regulatory Liabilities RegulatoryLiabilities	490287000	USD
CY2011Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	486180000	USD
CY2012Q2	us-gaap	Regulatory Assets RegulatoryAssets	290984000	USD
	us-gaap	Description Of Specific Regulatory Assets DescriptionOfSpecificRegulatoryAssets	During the prior fiscal year, the Railroad Commission of Texas’ Division of Public Safety issued a new rule requiring natural gas distribution companies to develop and implement a risk-based program for the renewal or replacement of distribution facilities, including steel service lines. The rule allows for the deferral of all expenses associated with capital expenditures incurred pursuant to this rule, including the recording of interest on the deferred expenses until the next rate proceeding (rate case or annual rate filing) at which time investment and costs would be recovered through base rates. As of June 30, 2012, we had deferred $2.1 million associated with the requirements of this rule which are recorded in “Other” in the regulatory assets table above. Effective January 1, 2012, the Texas Legislature amended its Gas Utility Regulatory Act (GURA) to permit natural gas utilities to defer into a regulatory asset or liability the difference between a gas utility’s actual pension and postretirement expense and the level of such expense recoverable in its existing rates.  The deferred amount will become eligible for inclusion in the utility’s rates in its next rate proceeding.  We elected to utilize this provision of GURA, effective January 1, 2012, and established a regulatory asset totaling $5.1 million, which is recorded in “Other” in the regulatory assets table above. Of this amount, $2.9 million represented a reduction to operation and maintenance expense during the second and third quarters of fiscal 2012.
	us-gaap	Regulatory Noncurrent Asset Amortization Period RegulatoryNoncurrentAssetAmortizationPeriod	Currently, our authorized rates do not include a return on certain of our merger and integration costs; however, we recover the amortization of these costs. Merger and integration costs, net, are generally amortized on a straight-line basis over estimated useful lives ranging up to 20 years. Environmental costs have been deferred to be included in future rate filings in accordance with rulings received from various state regulatory commissions.
CY2012Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-888000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-94000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2059000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1492000	USD
	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodNetOfTax	-17019000	USD
	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodNetOfTax	13536000	USD
CY2012Q2	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodNetOfTax	-31328000	USD
CY2011Q2	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodNetOfTax	-7884000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	17830000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-285000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-4060000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	14090000	USD
CY2012Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	16746000	USD
CY2011Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-8829000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	189730000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	234758000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-523000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-56000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1194000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	876000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	11401000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-182000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-2595000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	9008000	USD
CY2012Q2	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodTax	-18399000	USD
CY2011Q2	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodTax	-4629000	USD
	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodTax	-9995000	USD
	ato	Other Comprehensive Income Reclassification Adjustment And Unrealized Gain Loss On Derivatives Included In Net Income And Arising During Period Tax OtherComprehensiveIncomeReclassificationAdjustmentAndUnrealizedGainLossOnDerivativesIncludedInNetIncomeAndArisingDuringPeriodTax	7950000	USD
CY2012Q2	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	4617000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2558000	USD
CY2012Q2	ato	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Interest Rate Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromInterestRateHedgesEffectNetOfTax	-51176000	USD
CY2011Q3	ato	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Interest Rate Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromInterestRateHedgesEffectNetOfTax	-34157000	USD
CY2012Q2	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-20921000	USD
CY2011Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-16861000	USD
CY2012Q2	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	19354000	USD
CY2011Q2	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	6056000	USD
	ato	Minimum Length Of Time Hedged In Cash Flow Hedge MinimumLengthOfTimeHedgedInCashFlowHedge	1 month
	us-gaap	Maximum Length Of Time Hedged In Cash Flow Hedge MaximumLengthOfTimeHedgedInCashFlowHedge	53 months
CY2012Q2	ato	Disposal Group Including Discontinued Operation Derivative Liabilities Current DisposalGroupIncludingDiscontinuedOperationDerivativeLiabilitiesCurrent	700000	USD
CY2011Q3	ato	Disposal Group Including Discontinued Operation Derivative Liabilities Current DisposalGroupIncludingDiscontinuedOperationDerivativeLiabilitiesCurrent	1300000	USD
CY2012Q2	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnFairValueHedgingInstruments	14942000	USD
CY2011Q2	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnFairValueHedgingInstruments	-7837000	USD
	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnFairValueHedgingInstruments	-4834000	USD
	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnFairValueHedgingInstruments	-38211000	USD
CY2012Q2	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge	-34296000	USD
CY2011Q2	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge	1781000	USD
CY2012Q2	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	2077000	USD
CY2011Q2	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	853000	USD
CY2012Q2	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	17277000	USD
CY2011Q2	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	5203000	USD
	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge	16039000	USD
	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge	-19430000	USD
	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	24264000	USD
	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	22172000	USD
	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	2179000	USD
	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	1265000	USD
	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	19993000	USD
	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	22999000	USD
CY2012Q2	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	19000000	USD
CY2011Q2	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	5800000	USD
	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	21200000	USD
	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	23300000	USD
	us-gaap	Inventory Write Down InventoryWriteDown	1700000	USD
CY2012Q2	ato	Other Comprehensive Income Unrealized Gain Loss On Treasury Locks Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax	-31644000	USD
CY2011Q2	ato	Other Comprehensive Income Unrealized Gain Loss On Treasury Locks Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax	-8270000	USD
	ato	Other Comprehensive Income Unrealized Gain Loss On Treasury Locks Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax	-17968000	USD
	ato	Other Comprehensive Income Unrealized Gain Loss On Treasury Locks Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax	29822000	USD
CY2012Q2	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	5914000	USD
CY2011Q2	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	-2668000	USD
	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	-35998000	USD
	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	-1457000	USD
CY2012Q2	ato	Other Comprehensive Income Reclassification Adjustment On Treasury Locks Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax	316000	USD
CY2011Q2	ato	Other Comprehensive Income Reclassification Adjustment On Treasury Locks Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax	386000	USD
	ato	Other Comprehensive Income Reclassification Adjustment On Treasury Locks Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax	949000	USD
CY2012Q2	ato	Cash Held In Margin Accounts Offset Current Risk Management Liabilities CashHeldInMarginAccountsOffsetCurrentRiskManagementLiabilities	1800000	USD
CY2012Q2	ato	Cash Held In Margin Accounts Classified Current Risk Management Asset CashHeldInMarginAccountsClassifiedCurrentRiskManagementAsset	3900000	USD
	ato	Other Comprehensive Income Reclassification Adjustment On Treasury Locks Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax	-16286000	USD
CY2012Q2	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	11916000	USD
CY2011Q2	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	2383000	USD
	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	31938000	USD
	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	15547000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-13498000	USD
CY2011Q2	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-8169000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-21079000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	27626000	USD
	ato	Regulated Segments Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate RegulatedSegmentsEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.37	pure
	ato	Nonregulated Segment Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate NonregulatedSegmentEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.39	pure
	ato	Commodity Contract Gain Loss Reclassified To Earnings CommodityContractGainLossReclassifiedToEarnings	-20921000	USD
	ato	Total Hedge Gain Loss Reclassified To Earnings TotalHedgeGainLossReclassifiedToEarnings	-11587000	USD
	ato	Treasury Lock Gain Loss Reclassified To Earnings TreasuryLockGainLossReclassifiedToEarnings	9334000	USD
CY2012Q2	ato	Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax GainLossOnDerivativeInstrumentsNotDesignatedHedgesNetPretax	11200000	USD
CY2011Q2	ato	Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax GainLossOnDerivativeInstrumentsNotDesignatedHedgesNetPretax	-4300000	USD
	ato	Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax GainLossOnDerivativeInstrumentsNotDesignatedHedgesNetPretax	-3800000	USD
	ato	Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax GainLossOnDerivativeInstrumentsNotDesignatedHedgesNetPretax	3900000	USD
CY2011Q3	ato	Cash Collateral Right To Reclaim Cash CashCollateralRightToReclaimCash	28800000	USD
CY2011Q3	ato	Cash Held In Margin Accounts Offset Current Risk Management Liabilities CashHeldInMarginAccountsOffsetCurrentRiskManagementLiabilities	12400000	USD
CY2011Q3	ato	Cash Held In Margin Accounts Classified Current Risk Management Asset CashHeldInMarginAccountsClassifiedCurrentRiskManagementAsset	16400000	USD
CY2012Q2	ato	Cash Collateral Right To Reclaim Cash CashCollateralRightToReclaimCash	5700000	USD
CY2012Q2	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	7374000	USD
CY2011Q3	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	4351000	USD
CY2012Q2	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	62889000	USD
CY2011Q3	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	52633000	USD
CY2012Q2	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	46000	USD
CY2011Q3	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	276000	USD
CY2012Q2	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	55561000	USD
CY2011Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	48558000	USD
CY2011Q3	ato	Available For Sale Securities Supplemental Executive Benefit Plans AvailableForSaleSecuritiesSupplementalExecutiveBenefitPlans	38300000	USD
CY2012Q2	ato	Available For Sale Securities Supplemental Executive Benefit Plans AvailableForSaleSecuritiesSupplementalExecutiveBenefitPlans	39500000	USD
CY2012Q2	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	2633904000	USD
	us-gaap	Disposal Group Including Discontinued Operation Description And Timing Of Disposal DisposalGroupIncludingDiscontinuedOperationDescriptionAndTimingOfDisposal	On August 1, 2012, we completed the sale of substantially all of our natural gas distribution assets located in Missouri, Illinois and Iowa to Liberty Energy (Midstates) Corp., an affiliate of Algonquin Power & Utilities Corp. for a cash price of approximately $129 million.
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	6000000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	8745000	USD
CY2011Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	11524000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	58570000	USD
	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	71047000	USD
CY2012Q2	ato	Discontinued Operations Purchased Gas Cost DiscontinuedOperationsPurchasedGasCost	3005000	USD
CY2011Q2	ato	Discontinued Operations Purchased Gas Cost DiscontinuedOperationsPurchasedGasCost	5460000	USD
	ato	Discontinued Operations Purchased Gas Cost DiscontinuedOperationsPurchasedGasCost	34982000	USD
	ato	Discontinued Operations Purchased Gas Cost DiscontinuedOperationsPurchasedGasCost	44993000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Gross Profit Loss DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss	5740000	USD
CY2011Q2	us-gaap	Disposal Group Including Discontinued Operation Gross Profit Loss DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss	6064000	USD
	us-gaap	Disposal Group Including Discontinued Operation Gross Profit Loss DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss	23588000	USD
	us-gaap	Disposal Group Including Discontinued Operation Gross Profit Loss DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss	26054000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	4146000	USD
CY2011Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	4472000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	12595000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	12919000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	1594000	USD
CY2011Q2	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	1592000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	10993000	USD
	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	13135000	USD
CY2012Q2	ato	Discontinued Operations Miscellaneous And Interest Expense DiscontinuedOperationsMiscellaneousAndInterestExpense	40000	USD
CY2011Q2	ato	Discontinued Operations Miscellaneous And Interest Expense DiscontinuedOperationsMiscellaneousAndInterestExpense	94000	USD
	ato	Discontinued Operations Miscellaneous And Interest Expense DiscontinuedOperationsMiscellaneousAndInterestExpense	126000	USD
	ato	Discontinued Operations Miscellaneous And Interest Expense DiscontinuedOperationsMiscellaneousAndInterestExpense	159000	USD
CY2012Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	1554000	USD
CY2011Q2	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	1498000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	10867000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	12976000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	126685000	USD
CY2012Q2	ato	Disposal Group Including Discontinued Operation Gas Stored Underground DisposalGroupIncludingDiscontinuedOperationGasStoredUnderground	5746000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	2998000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Assets DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets	100000	USD
CY2012Q2	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	135529000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Accounts Payable DisposalGroupIncludingDiscontinuedOperationAccountsPayable	1526000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Other Current Liabilities DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities	8722000	USD
CY2012Q2	ato	Disposal Group Including Discontinued Operation Regulatory Cost Of Removal Obligation DisposalGroupIncludingDiscontinuedOperationRegulatoryCostOfRemovalObligation	6927000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	869000	USD
CY2012Q2	ato	Liabilities Of Disposal Group LiabilitiesOfDisposalGroup	18044000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	127577000	USD
CY2011Q3	ato	Disposal Group Including Discontinued Operation Gas Stored Underground DisposalGroupIncludingDiscontinuedOperationGasStoredUnderground	11931000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	786000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Assets DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets	277000	USD
CY2011Q3	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	140571000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Accounts Payable DisposalGroupIncludingDiscontinuedOperationAccountsPayable	1917000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Other Current Liabilities DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities	4877000	USD
CY2011Q3	ato	Disposal Group Including Discontinued Operation Regulatory Cost Of Removal Obligation DisposalGroupIncludingDiscontinuedOperationRegulatoryCostOfRemovalObligation	10498000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	1153000	USD
CY2011Q3	ato	Liabilities Of Disposal Group LiabilitiesOfDisposalGroup	18445000	USD
	ato	Disposal Group Not Discontinued Operation Description And Timing Of Disposal DisposalGroupNotDiscontinuedOperationDescriptionAndTimingOfDisposal	On August 8, 2012, we entered into a definitive agreement to sell all of our natural gas distribution assets located in Georgia to Liberty Energy (Georgia) Corp., an affiliate of Algonquin Power & Utilities Corp. for a cash price of approximately $141 million. The agreement contains terms and conditions customary for transactions of this type, including typical adjustments to the purchase price at closing, if applicable. The closing of the transaction is subject to the satisfaction of customary conditions including the receipt of applicable regulatory approvals, which we currently anticipate will occur in fiscal 2013.
CY2012Q2	ato	Disposal Group Not Discontinued Operation Property Plant And Equipment Net DisposalGroupNotDiscontinuedOperationPropertyPlantAndEquipmentNet	133336000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Gas Stored Underground DisposalGroupNotDiscontinuedOperationGasStoredUnderground	2389000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Other Current Assets DisposalGroupNotDiscontinuedOperationOtherCurrentAssets	6885000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Other Noncurrent Assets DisposalGroupNotDiscontinuedOperationOtherNoncurrentAssets	112000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Assets Of Disposal Group DisposalGroupNotDiscontinuedOperationAssetsOfDisposalGroup	142722000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Accounts Payable DisposalGroupNotDiscontinuedOperationAccountsPayable	1570000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Other Current Liabilities DisposalGroupNotDiscontinuedOperationOtherCurrentLiabilities	3275000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Regulatory Cost Of Removal Obligation DisposalGroupNotDiscontinuedOperationRegulatoryCostOfRemovalObligation	4010000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Other Noncurrent Liabilities DisposalGroupNotDiscontinuedOperationOtherNoncurrentLiabilities	296000	USD
CY2012Q2	ato	Disposal Group Not Discontinued Operation Liabilities Of Disposal Group DisposalGroupNotDiscontinuedOperationLiabilitiesOfDisposalGroup	9151000	USD
CY2012Q2	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2210196000	USD
CY2011Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2212565000	USD
CY2012Q2	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	3776000	USD
CY2011Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4014000	USD
CY2012Q2	ato	Authorized Commercial Paper AuthorizedCommercialPaper	750000000	USD
CY2012Q2	us-gaap	Commercial Paper CommercialPaper	213500000	USD
CY2012Q2	ato	Aem Net Working Capital AemNetWorkingCapital	122000000	USD
CY2012Q2	ato	Aem Tangible Net Worth AemTangibleNetWorth	152300000	USD
CY2012Q2	ato	Debt And Equity Securities Authorized For Issuance DebtAndEquitySecuritiesAuthorizedForIssuance	1300000000	USD
CY2012Q2	ato	Debt And Equity Securities Available For Issuance DebtAndEquitySecuritiesAvailableForIssuance	900000000	USD
CY2012Q2	ato	Ratio Of Total Debt To Total Capital RatioOfTotalDebtToTotalCapital	0.53	pure
CY2011Q3	us-gaap	Commercial Paper CommercialPaper	206400000	USD
CY2012Q2	ato	Line Of Credit Facility Current Available Borrowing Capacity LineOfCreditFacilityCurrentAvailableBorrowingCapacity	2500000	USD
CY2012Q2	ato	Regulated Operations Line Of Credit Facilities Covenant Terms RegulatedOperationsLineOfCreditFacilitiesCovenantTerms	We are required by the financial covenants in each of these facilities to maintain, at the end of each fiscal quarter, a ratio of total debt to total capitalization of no greater than 70 percent.
CY2012Q2	us-gaap	Debt Instrument Covenant Description DebtInstrumentCovenantDescription	In addition to these financial covenants, our credit facilities and public indentures contain usual and customary covenants for our business, including covenants substantially limiting liens, substantial asset sales and mergers. Additionally, our public debt indentures relating to our senior notes and debentures, as well as our revolving credit agreements, each contain a default provision that is triggered if outstanding indebtedness arising out of any other credit agreements in amounts ranging from in excess of $15 million to in excess of $100 million becomes due by acceleration or is not paid at maturity. Further, AEM’s credit agreement contains a cross-default provision whereby AEM would be in default if it defaults on other indebtedness, as defined, by at least $250 thousand in the aggregate. Finally, AEM’s credit agreement contains a provision that would limit the amount of credit available if Atmos Energy were downgraded below an S&P rating of BBB and a Moody’s rating of Baa2. We have no other triggering events in our debt instruments that are tied to changes in specified credit ratings or stock price, nor have we entered into any transactions that would require us to issue equity, based on our credit rating or other triggering events.
CY2012Q2	us-gaap	Debt Instrument Covenant Compliance DebtInstrumentCovenantCompliance	We were in compliance with all of our debt covenants as of June 30, 2012.
CY2012Q2	us-gaap	Line Of Credit Facility Description LineOfCreditFacilityDescription	This facility bears interest at the lower of (i) the Eurodollar rate under the five-year revolving credit facility or (ii) the lowest rate outstanding under the commercial paper program. Applicable state regulatory commissions have approved our use of this facility through December 31, 2012. To supplement borrowings under this facility, AEH had a $350 million intercompany demand credit facility with AEC. This facility was replaced on January 1, 2012 with a $500 million intercompany facility with AEC, which bears interest at a rate equal to the greater of (i) the one-month LIBOR rate plus 3.00 percent or (ii) the rate for AEM’s offshore borrowings under its committed credit facility plus 0.75 percent. Applicable state regulatory commissions have approved our use of this facility through December 31, 2012.
CY2012Q2	ato	Nonregulated Operations Line Of Credit Facilities Covenant Terms NonregulatedOperationsLineOfCreditFacilitiesCovenantTerms	AEM is required by the financial covenants in its facility to maintain a ratio of total liabilities to tangible net worth that does not exceed a maximum of 5 to 1. At June 30, 2012, AEM’s ratio of total liabilities to tangible net worth, as defined, was 0.77 to 1. Additionally, AEM must maintain minimum levels of net working capital and net worth ranging from $20 million to $40 million.
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	200995000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	30019000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1442000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	195710000	USD
	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	29000	USD
CY2012Q2	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	4000	USD
CY2011Q2	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	20000	USD
	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	82000	USD
	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	6879000	USD
CY2012Q2	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	984000	USD
CY2011Q2	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	888000	USD
	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	7772000	USD
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	5000	USD
CY2012Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	0	USD
CY2011Q2	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	0	USD
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	4000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	201000000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	30019000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-1442000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	195714000	USD
CY2012Q2	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	875000	shares
CY2011Q2	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	0	shares
	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	875000	shares
	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	297000	shares
	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	0	USD
CY2012Q2	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	0	USD
CY2011Q2	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	2000	USD
	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	0	USD
	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	6879000	USD
CY2012Q2	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	984000	USD
CY2011Q2	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	890000	USD
	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	7772000	USD
	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	875000	shares
CY2012Q2	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	875000	shares
CY2011Q2	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	0	shares
	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	297000	shares
	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	91006000	shares
CY2012Q2	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	90993000	shares
CY2011Q2	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	90127000	shares
	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	90530000	shares
CY2012Q2	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	125000	USD
CY2011Q2	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	-32000	USD
	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	847000	USD
	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	2076000	USD
CY2012Q2	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	5000000	shares
CY2012Q2	us-gaap	Stock Repurchase Program Period In Force StockRepurchaseProgramPeriodInForce	5	pure
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	12500000	USD
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	387991	shares
CY2011Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	288000	shares
CY2012Q2	ato	Significant Purchase Commitment Remaining Minimum Amount Committed Next Fiscal Year SignificantPurchaseCommitmentRemainingMinimumAmountCommittedNextFiscalYear	241797000	USD
CY2012Q2	ato	Significant Purchase Commitment Remaining Minimum Amount Committed Second Fiscal Year SignificantPurchaseCommitmentRemainingMinimumAmountCommittedSecondFiscalYear	70633000	USD
	ato	Description Of Pending Litigation DescriptionOfPendingLitigation	Since April 2009, Atmos Energy and two subsidiaries of AEH, AEM and Atmos Gathering Company, LLC (AGC) (collectively, the Atmos Entities), have been involved in a lawsuit filed in the Circuit Court of Edmonson County, Kentucky, Billy Joe Honeycutt et al. vs. Atmos Energy Corporation, et al., which is 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, appealing the verdict of the trial court. The appellees in this case subsequently filed their appellees’ brief with the Court of Appeals on January 16, 2012, with our reply brief being filed with the Court on March 19, 2012. Oral arguments are scheduled in the case in late August 2012. In addition, in a related development, 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 “open-ended” since the appellate process and related costs are ongoing. 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. We have accrued what we believe is an adequate amount for the anticipated resolution of this matter; however, the amount accrued is less than the amount of the verdict. The Company does not have insurance coverage that could mitigate any losses that may arise from the resolution of this matter. However, we continue to believe that the final outcome will not have a material adverse effect on our financial condition, results of operations or cash flows.
CY2012Q2	ato	Significant Purchase Commitment Amount Description SignificantPurchaseCommitmentAmountDescription	176600000	USD
CY2011Q2	ato	Significant Purchase Commitment Amount Description SignificantPurchaseCommitmentAmountDescription	356800000	USD
	ato	Significant Purchase Commitment Amount Description SignificantPurchaseCommitmentAmountDescription	753000000	USD
	ato	Significant Purchase Commitment Amount Description SignificantPurchaseCommitmentAmountDescription	1130000000	USD
CY2012Q2	ato	Significant Purchase Commitment Remaining Minimum Amount Committed Current Fiscal Year SignificantPurchaseCommitmentRemainingMinimumAmountCommittedCurrentFiscalYear	33563000	USD
CY2012Q2	ato	Significant Purchase Commitment Remaining Minimum Amount Committed Third Fiscal Year SignificantPurchaseCommitmentRemainingMinimumAmountCommittedThirdFiscalYear	0	USD
CY2012Q2	ato	Significant Purchase Commitment Remaining Minimum Amount Committed Fourth Fiscal Year SignificantPurchaseCommitmentRemainingMinimumAmountCommittedFourthFiscalYear	0	USD
CY2012Q2	ato	Significant Purchase Commitment Remaining Minimum Amount Committed Thereafter SignificantPurchaseCommitmentRemainingMinimumAmountCommittedThereafter	0	USD
CY2012Q2	ato	Total Estimated Purchase Commitments TotalEstimatedPurchaseCommitments	345993000	USD
	us-gaap	Loss Contingency Settlement Agreement Consideration LossContingencySettlementAgreementConsideration	As previously described in Note 13 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2011, in December 2007, the Company received data requests from the Division of Investigations of the Office of Enforcement of the Federal Energy Regulatory Commission (the “Commission”) in connection with its investigation into possible violations of the Commission’s posting and competitive bidding regulations for pre-arranged released firm capacity on natural gas pipelines. The Company and the Commission entered into a stipulation and consent agreement, which was approved by the Commission on December 9, 2011, thereby resolving this investigation. The Commission’s findings of violations were limited to the nonregulated operations of the Company. Under the terms of the agreement, the Company paid to the United States Treasury a total civil penalty of approximately $6.4 million and to energy assistance programs approximately $5.6 million in disgorgement of unjust profits plus interest for violations identified during the investigation. The resolution of this matter did not have a material adverse impact on the Company’s financial position, results of operations or cash flows and none of the payments were charged to any of the Company’s customers. In addition, none of the services the Company provides to any of its regulated or nonregulated customers were affected by the agreement.
	ato	Steel Service Line Replacement Cost SteelServiceLineReplacementCost	100500000	USD
CY2012Q2	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	186251000	USD
CY2011Q2	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	143620000	USD

Files In Submission

Name	View Source	Status
0001193125-12-346532-index-headers.html	Edgar Link	pending
0001193125-12-346532-index.html	Edgar Link	pending
0001193125-12-346532.txt	Edgar Link	pending
0001193125-12-346532-xbrl.zip	Edgar Link	pending
ato-20120630.xml	Edgar Link	completed
ato-20120630.xsd	Edgar Link	pending
ato-20120630_cal.xml	Edgar Link	unprocessable
ato-20120630_def.xml	Edgar Link	unprocessable
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d393346d10q.htm	Edgar Link	pending
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$ATO
ATMOS ENERGY CORP Stock $ato

2012 Q3 Form 10-Q Financial Statement

#000119312512346532 Filed on August 09, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATO ATMOS ENERGY CORP Stock $ato

2012 Q3 Form 10-Q Financial Statement

#000119312512346532 Filed on August 09, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATO
ATMOS ENERGY CORP Stock $ato