$ATO
ATMOS ENERGY CORP Stock $ato

$ato Overview Financials Valuation SEC Filings Company Website

2015 Q4 Form 10-K Financial Statement

#000073180215000030 Filed on November 06, 2015

Income Statement

Concept	2015 Q4	2014 Q3	2014 Q2
Revenue	$674.8M	$789.0M	$943.2M
YoY Change	-23.95%	17.0%	9.93%
Cost Of Revenue	$240.3M	$441.1M	$583.6M
YoY Change	-71.24%	17.97%	-104687.81%
Gross Profit	$434.4M	$337.7M	$359.5M
YoY Change	5.1%	12.39%	13.6%
Gross Profit Margin	64.38%	42.79%	38.12%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$71.24M	$68.30M	$63.90M
YoY Change	5.38%	13.46%	9.98%
% of Gross Profit	16.4%	20.23%	17.77%
Operating Expenses	$241.7M	$253.7M	$252.9M
YoY Change	2.61%	1.44%	9.92%
Operating Profit	$192.7M	$83.94M	$106.6M
YoY Change	4.24%	66.61%	23.39%
Interest Expense	$29.54M	-$33.70M	$31.84M
YoY Change	-0.76%	5.97%	-2.75%
% of Operating Profit	15.33%	-40.15%	29.87%
Other Income/Expense, Net	-$879.0K	-$1.200M	-$374.0K
YoY Change	-48.51%	-42.86%	-19.91%
Pretax Income	$162.3M	$49.00M	$74.39M
YoY Change	3.88%	196.97%	39.86%
Income Tax	$60.77M	$25.30M	$28.67M
% Of Pretax Income	37.44%	51.63%	38.54%
Net Earnings	$102.9M	$23.71M	$45.72M
YoY Change	5.4%	214.66%	17.93%
Net Earnings / Revenue	15.24%	3.01%	4.85%
Basic Earnings Per Share	$1.00	$0.23	$0.45
Diluted Earnings Per Share	$1.00	$0.23	$0.45
COMMON SHARES
Basic Shares Outstanding	101.5M shares	100.4M shares	101.2M shares
Diluted Shares Outstanding			101.2M shares

Balance Sheet

Concept	2015 Q4	2014 Q3	2014 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$79.00M	$121.9M	$51.00M
YoY Change	-36.29%	-12.25%	59.38%
Cash & Equivalents	$47.92M	$42.26M	$51.42M
Short-Term Investments		$79.61M
Other Short-Term Assets	$91.45M	$111.3M	$126.9M
YoY Change	-16.56%	73.31%	39.54%
Inventory	$236.0M	$279.0M	$207.0M
Prepaid Expenses		$25.04M
Receivables	$456.9M	$343.4M	$388.9M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$863.3M	$775.8M	$774.6M
YoY Change	-22.84%	14.58%	13.54%
LONG-TERM ASSETS
Property, Plant & Equipment	$7.653B	$6.726B	$6.461B
YoY Change	10.71%	11.53%	10.62%
Goodwill	$742.7M	$742.0M	$741.4M
YoY Change	0.09%	0.09%	0.09%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$295.4M	$350.9M	$379.7M
YoY Change	-13.57%	-27.66%	-29.49%
Total Long-Term Assets	$8.691B	$7.819B	$7.583B
YoY Change	8.69%	7.74%	6.49%
TOTAL ASSETS
Total Short-Term Assets	$863.3M	$775.8M	$774.6M
Total Long-Term Assets	$8.691B	$7.819B	$7.583B
Total Assets	$9.555B	$8.595B	$8.357B
YoY Change	4.82%	8.32%	7.11%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$280.0M	$308.0M	$313.0M
YoY Change	-29.65%	27.27%	36.09%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$763.2M	$196.7M	$0.00
YoY Change	38.54%	-46.55%	-100.0%
Long-Term Debt Due		$0.00	$500.0M
YoY Change
Total Short-Term Liabilities	$1.515B	$910.7M	$1.156B
YoY Change	6.65%	-6.93%	60.38%
LONG-TERM LIABILITIES
Long-Term Debt	$2.455B	$2.456B	$1.956B
YoY Change	0.01%	0.01%	-20.35%
Other Long-Term Liabilities	$155.2M	$68.87M	$48.48M
YoY Change	19.66%	83.35%	13.29%
Total Long-Term Liabilities	$2.611B	$2.525B	$2.004B
YoY Change	1.0%	1.27%	-19.77%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.515B	$910.7M	$1.156B
Total Long-Term Liabilities	$2.611B	$2.525B	$2.004B
Total Liabilities	$4.126B	$3.436B	$3.160B
YoY Change	3.0%	-1.04%	-1.83%
SHAREHOLDERS EQUITY
Retained Earnings	$1.132B	$918.0M	$932.6M
YoY Change	16.01%	18.41%	16.48%
Common Stock	$2.243B	$2.181B	$2.173B
YoY Change	2.78%	23.46%	23.63%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.272B	$3.086B	$3.117B
YoY Change
Total Liabilities & Shareholders Equity	$9.555B	$8.595B	$8.357B
YoY Change	4.82%	8.32%	7.11%

Cashflow Statement

Concept	2015 Q4	2014 Q3	2014 Q2
OPERATING ACTIVITIES
Net Income	$102.9M	$23.71M	$45.72M
YoY Change	5.4%	214.66%	17.93%
Depreciation, Depletion And Amortization	$71.24M	$68.30M	$63.90M
YoY Change	5.38%	13.46%	9.98%
Cash From Operating Activities	$70.14M	$109.8M	$139.2M
YoY Change	155.85%	6.09%	4.43%
INVESTING ACTIVITIES
Capital Expenditures	-$290.4M	-$282.7M	-$193.6M
YoY Change	11.14%	7.7%	0.1%
Acquisitions
YoY Change
Other Investing Activities	-$2.382M	-$1.700M	$4.300M
YoY Change	-422.33%	-5.56%	-97.2%
Cash From Investing Activities	-$290.3M	-$284.4M	-$189.3M
YoY Change	10.78%	7.6%	375.63%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00
YoY Change
Debt Paid & Issued, Net	$0.00
YoY Change	-100.0%
Cash From Financing Activities	$270.4M	165.4M	-35.30M
YoY Change	-14.49%	-15.14%	-72.2%
NET CHANGE
Cash From Operating Activities	$70.14M	109.8M	139.2M
Cash From Investing Activities	-$290.3M	-284.4M	-189.3M
Cash From Financing Activities	$270.4M	165.4M	-35.30M
Net Change In Cash	$50.25M	-9.200M	-85.40M
YoY Change	-38.4%	-126.98%	154.93%
FREE CASH FLOW
Cash From Operating Activities	$70.14M	$109.8M	$139.2M
Capital Expenditures	-$290.4M	-$282.7M	-$193.6M
Free Cash Flow	$360.5M	$392.5M	$332.8M
YoY Change	24.88%	7.24%	1.87%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2014Q3	ato	Accrued Gas Payable AccruedGasPayable	179425000	USD
CY2015Q3	ato	Accrued Gas Payable AccruedGasPayable	119825000	USD
CY2013	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
CY2015	ato	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Discontinued Operations AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsDiscontinuedOperations	0	USD
CY2015Q3	ato	Annual Maximum Investment For Direct Stock Purchase Plan AnnualMaximumInvestmentForDirectStockPurchasePlan	100000	USD
CY2014Q3	ato	Asset Retirement Costs In Property Plant And Equipment AssetRetirementCostsInPropertyPlantAndEquipment	5900000	USD
CY2015Q3	ato	Asset Retirement Costs In Property Plant And Equipment AssetRetirementCostsInPropertyPlantAndEquipment	4800000	USD
CY2015Q3	ato	Contractual Demand Fees Demand Fees Due Thereafter ContractualDemandFeesDemandFeesDueThereafter	1101000	USD
CY2015Q3	ato	Contractual Demand Fees Demand Fees Due Third Fiscal Year ContractualDemandFeesDemandFeesDueThirdFiscalYear	1966000	USD
CY2014Q3	ato	Available For Sale Securities Supplemental Executive Benefit Plans AvailableForSaleSecuritiesSupplementalExecutiveBenefitPlans	46200000	USD
CY2015Q3	ato	Available For Sale Securities Supplemental Executive Benefit Plans AvailableForSaleSecuritiesSupplementalExecutiveBenefitPlans	41700000	USD
CY2013	ato	Cash Flow Hedge Gain Loss Impacton Earnings CashFlowHedgeGainLossImpactonEarnings	-14170000	USD
CY2014	ato	Cash Flow Hedge Gain Loss Impacton Earnings CashFlowHedgeGainLossImpactonEarnings	4333000	USD
CY2015	ato	Cash Flow Hedge Gain Loss Impacton Earnings CashFlowHedgeGainLossImpactonEarnings	-42894000	USD
CY2013	ato	Cash Flow Hedge Gain Loss Included In Cost Of Sales Net CashFlowHedgeGainLossIncludedInCostOfSalesNet	-10681000	USD
CY2014	ato	Cash Flow Hedge Gain Loss Included In Cost Of Sales Net CashFlowHedgeGainLossIncludedInCostOfSalesNet	8563000	USD
CY2015	ato	Cash Flow Hedge Gain Loss Included In Cost Of Sales Net CashFlowHedgeGainLossIncludedInCostOfSalesNet	-42041000	USD
CY2013	ato	Cash Flow Hedge Gain Loss Reclassifiedto Purchased Gas Cost Net CashFlowHedgeGainLossReclassifiedtoPurchasedGasCostNet	-10778000	USD
CY2014	ato	Cash Flow Hedge Gain Loss Reclassifiedto Purchased Gas Cost Net CashFlowHedgeGainLossReclassifiedtoPurchasedGasCostNet	8365000	USD
CY2015	ato	Cash Flow Hedge Gain Loss Reclassifiedto Purchased Gas Cost Net CashFlowHedgeGainLossReclassifiedtoPurchasedGasCostNet	-41716000	USD
CY2015	ato	Cash Flow Hedge Gain Loss To Be Recassiflied Total CashFlowHedgeGainLossToBeRecassifliedTotal	-44087000	USD
CY2015	ato	Cash Flow Hedge Gain Loss To Be Reclassifed Year Two CashFlowHedgeGainLossToBeReclassifedYearTwo	-5491000	USD
CY2015	ato	Cash Flow Hedge Gain Loss To Be Reclassified After Year Five CashFlowHedgeGainLossToBeReclassifiedAfterYearFive	-15836000	USD
CY2015	ato	Cash Flow Hedge Gain Loss To Be Reclassified Year Five CashFlowHedgeGainLossToBeReclassifiedYearFive	-703000	USD
CY2015	ato	Cash Flow Hedge Gain Loss To Be Reclassified Year Four CashFlowHedgeGainLossToBeReclassifiedYearFour	-758000	USD
CY2015	ato	Cash Flow Hedge Gain Loss To Be Reclassified Year Three CashFlowHedgeGainLossToBeReclassifiedYearThree	-1468000	USD
CY2015	ato	Charitable Contribution Carryforwards Expiration Date Maximum CharitableContributionCarryforwardsExpirationDateMaximum	2020-12-31
CY2015	ato	Charitable Contribution Carryforwards Expiration Date Minimum CharitableContributionCarryforwardsExpirationDateMinimum	2015-12-31
CY2014Q3	ato	Commercial Paper Weighted Average Interest Rate CommercialPaperWeightedAverageInterestRate	0.0023
CY2015Q3	ato	Commercial Paper Weighted Average Interest Rate CommercialPaperWeightedAverageInterestRate	0.0042
CY2015Q3	ato	Contractual Demand Fees Demand Fees Due Fifth Fiscal Year ContractualDemandFeesDemandFeesDueFifthFiscalYear	398000	USD
CY2015Q3	ato	Contractual Demand Fees Demand Fees Due Fourth Fiscal Year ContractualDemandFeesDemandFeesDueFourthFiscalYear	426000	USD
CY2015Q3	ato	Contractual Demand Fees Demand Fees Due Next Fiscal Year ContractualDemandFeesDemandFeesDueNextFiscalYear	7843000	USD
CY2015Q3	ato	Contractual Demand Fees Demand Fees Due Second Fiscal Year ContractualDemandFeesDemandFeesDueSecondFiscalYear	3522000	USD
CY2015Q3	ato	Debt And Equity Securities Authorized For Issuance DebtAndEquitySecuritiesAuthorizedForIssuance	1750000000	USD
CY2015Q3	ato	Debt And Equity Securities Available For Issuance DebtAndEquitySecuritiesAvailableForIssuance	845000000	USD
CY2014Q3	ato	Deferred Tax Assets Deferred Credits DeferredTaxAssetsDeferredCredits	109000	USD
CY2015Q3	ato	Deferred Tax Assets Deferred Credits DeferredTaxAssetsDeferredCredits	-412000	USD
CY2014Q3	ato	Deferred Tax Liabilities Pension Liability DeferredTaxLiabilitiesPensionLiability	17890000	USD
CY2015Q3	ato	Deferred Tax Liabilities Pension Liability DeferredTaxLiabilitiesPensionLiability	35247000	USD
CY2013	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	236928000	USD
CY2014	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	253987000	USD
CY2015	ato	Depreciation And Amortization Cash Flow DepreciationAndAmortizationCashFlow	274796000	USD
CY2014Q3	ato	Derivative Cash Collateral DerivativeCashCollateral	25800000	USD
CY2015Q3	ato	Derivative Cash Collateral DerivativeCashCollateral	43500000	USD
CY2013	ato	Discontinued Operations Gross Profit DiscontinuedOperationsGrossProfit	16498000	USD
CY2013	ato	Discontinued Operations Miscellaneous Income Expense DiscontinuedOperationsMiscellaneousIncomeExpense	548000	USD
CY2013	ato	Discontinued Operations Operating Revenues DiscontinuedOperationsOperatingRevenues	37962000	USD
CY2013	ato	Discontinued Operations Purchased Gas Cost DiscontinuedOperationsPurchasedGasCost	21464000	USD
CY2013	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	208000	USD
CY2014	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	919000	USD
CY2015	ato	Fair Value Hedge Basis Ineffectiveness FairValueHedgeBasisIneffectiveness	-811000	USD
CY2013	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	-18311000	USD
CY2014	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	-2613000	USD
CY2015	ato	Fair Value Hedge Timing Ineffectiveness FairValueHedgeTimingIneffectiveness	268000	USD
CY2013	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	18200000	USD
CY2014	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	1900000	USD
CY2015	ato	Gain Loss On Hedge Ineffectiveness GainLossOnHedgeIneffectiveness	200000	USD
CY2015	ato	Hedge Percentage Of Actual Heating Season Gas HedgePercentageOfActualHeatingSeasonGas	0.37
CY2015	ato	Hedge Volume Of Actual Heating Season Gas HedgeVolumeOfActualHeatingSeasonGas	28200	MMcf
CY2014Q3	ato	Hedged Portion Of Gas Stored Underground Fair Value Disclosure HedgedPortionOfGasStoredUndergroundFairValueDisclosure	40492000	USD
CY2015Q3	ato	Hedged Portion Of Gas Stored Underground Fair Value Disclosure HedgedPortionOfGasStoredUndergroundFairValueDisclosure	43901000	USD
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
CY2015	ato	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights Discontinued Operations IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRightsDiscontinuedOperations	0	shares
CY2014Q3	ato	Intercompany Payables IntercompanyPayables	0	USD
CY2015Q3	ato	Intercompany Payables IntercompanyPayables	0	USD
CY2014Q3	ato	Intercompany Receivables IntercompanyReceivables	0	USD
CY2015Q3	ato	Intercompany Receivables IntercompanyReceivables	0	USD
CY2014Q3	ato	Investment In Subsidaries InvestmentInSubsidaries	0	USD
CY2015Q3	ato	Investment In Subsidaries InvestmentInSubsidaries	0	USD
CY2013	ato	Investment Tax Credits InvestmentTaxCredits	20000	USD
CY2014	ato	Investment Tax Credits InvestmentTaxCredits	6000	USD
CY2015	ato	Investment Tax Credits InvestmentTaxCredits	6000	USD
CY2015	ato	Maximum Hedge Percentage Of Anticipated Heating Season Gas MaximumHedgePercentageOfAnticipatedHeatingSeasonGas	0.50
CY2015Q3	ato	Minimum Continuing Investment For Direct Stock Purchase Plan MinimumContinuingInvestmentForDirectStockPurchasePlan	25	USD
CY2015	ato	Minimum Hedge Percentage Of Anticipated Heating Season Gas MinimumHedgePercentageOfAnticipatedHeatingSeasonGas	0.25
CY2015Q3	ato	Minimum Initial Investment For Direct Stock Purchase Plan MinimumInitialInvestmentForDirectStockPurchasePlan	1250	USD
CY2015	ato	Minimum Length Of Time Hedged In Cash Flow Hedge MinimumLengthOfTimeHedgedInCashFlowHedge	P1M
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
CY2015	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Basic NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersBasic	0	USD
CY2013	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	12454000	USD
CY2014	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	0	USD
CY2015	ato	Net Income Loss From Discontinued Operations Available To Common Stockholders Diluted NetIncomeLossFromDiscontinuedOperationsAvailableToCommonStockholdersDiluted	0	USD
CY2015Q3	ato	Net Open Positions NetOpenPositions	1000	MMcf
CY2015	ato	Nonregulated Segment Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate NonregulatedSegmentEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.39
CY2015Q3	ato	Number Of Customers Regulated Distribution NumberOfCustomersRegulatedDistribution	3000000	customers
CY2015Q3	ato	Number Of Divisions Regulated Distribution NumberOfDivisionsRegulatedDistribution	6	regulated_gas_distributions_divisions
CY2014	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	-5102000	USD
CY2015	ato	Other Comprehensive Income Reclassification Adjustment On Forward Commodity Contracts Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax	25448000	USD
CY2014	ato	Other Comprehensive Income Reclassification Adjustment On Interest Rate Agreements Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnInterestRateAgreementsIncludedInNetIncomeNetOfTax	2686000	USD
CY2015	ato	Other Comprehensive Income Reclassification Adjustment On Interest Rate Agreements Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnInterestRateAgreementsIncludedInNetIncomeNetOfTax	542000	USD
CY2014	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	7904000	USD
CY2015	ato	Other Comprehensive Income Unrealized Gain Loss On Forward Commodity Contracts Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax	-49211000	USD
CY2014	ato	Other Comprehensive Income Unrealized Gain Loss On Interest Rate Agreements Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnInterestRateAgreementsArisingDuringPeriodNetOfTax	-58973000	USD
CY2015	ato	Other Comprehensive Income Unrealized Gain Loss On Interest Rate Agreements Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnInterestRateAgreementsArisingDuringPeriodNetOfTax	-71003000	USD
CY2014Q3	ato	Other Liabilities Current Other OtherLiabilitiesCurrentOther	20985000	USD
CY2015Q3	ato	Other Liabilities Current Other OtherLiabilitiesCurrentOther	9966000	USD
CY2014Q3	ato	Other Liabilities Noncurrent Other OtherLiabilitiesNoncurrentOther	23881000	USD
CY2015Q3	ato	Other Liabilities Noncurrent Other OtherLiabilitiesNoncurrentOther	29085000	USD
CY2014Q3	ato	Public Utilities Property Plantand Equipment Plantin Service Excluding Construction Workin Progress PublicUtilitiesPropertyPlantandEquipmentPlantinServiceExcludingConstructionWorkinProgress	8200121000	USD
CY2015Q3	ato	Public Utilities Property Plantand Equipment Plantin Service Excluding Construction Workin Progress PublicUtilitiesPropertyPlantandEquipmentPlantinServiceExcludingConstructionWorkinProgress	8959702000	USD
CY2014Q3	ato	Public Utilities Property Plantand Equipment Storage PublicUtilitiesPropertyPlantandEquipmentStorage	275579000	USD
CY2015Q3	ato	Public Utilities Property Plantand Equipment Storage PublicUtilitiesPropertyPlantandEquipmentStorage	286011000	USD
CY2015	ato	Regulated Segments Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate RegulatedSegmentsEffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.37
CY2014Q3	ato	Regulatory Asset Future Recoverable Pension Costs RegulatoryAssetFutureRecoverablePensionCosts	18800000	USD
CY2015Q3	ato	Regulatory Asset Future Recoverable Pension Costs RegulatoryAssetFutureRecoverablePensionCosts	16600000	USD
CY2014Q3	ato	Regulatory Cost Of Removal Liability RegulatoryCostOfRemovalLiability	445387000	USD
CY2015Q3	ato	Regulatory Cost Of Removal Liability RegulatoryCostOfRemovalLiability	427553000	USD
CY2014Q3	ato	Regulatory Cost Of Removal Liability Current RegulatoryCostOfRemovalLiabilityCurrent	45061000	USD
CY2015Q3	ato	Regulatory Cost Of Removal Liability Current RegulatoryCostOfRemovalLiabilityCurrent	56123000	USD
CY2014Q3	ato	Regulatory Cost Of Removal Obligation RegulatoryCostOfRemovalObligation	445387000	USD
CY2015Q3	ato	Regulatory Cost Of Removal Obligation RegulatoryCostOfRemovalObligation	427553000	USD
CY2014Q3	ato	Segment Reporting Information Other Current Assets SegmentReportingInformationOtherCurrentAssets	687755000	USD
CY2015Q3	ato	Segment Reporting Information Other Current Assets SegmentReportingInformationOtherCurrentAssets	593100000	USD
CY2014Q3	ato	Segment Reporting Information Other Current Liabilities SegmentReportingInformationOtherCurrentLiabilities	712225000	USD
CY2015Q3	ato	Segment Reporting Information Other Current Liabilities SegmentReportingInformationOtherCurrentLiabilities	687328000	USD
CY2014Q3	ato	Segment Reporting Information Other Noncurrent Assets SegmentReportingInformationOtherNoncurrentAssets	337891000	USD
CY2015Q3	ato	Segment Reporting Information Other Noncurrent Assets SegmentReportingInformationOtherNoncurrentAssets	288310000	USD
CY2014Q3	ato	Segment Reporting Information Other Noncurrent Liabilities SegmentReportingInformationOtherNoncurrentLiabilities	48744000	USD
CY2015Q3	ato	Segment Reporting Information Other Noncurrent Liabilities SegmentReportingInformationOtherNoncurrentLiabilities	51157000	USD
CY2012Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Beginning Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberBeginningBalance	1262582	shares
CY2013Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Beginning Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberBeginningBalance	1052844	shares
CY2014Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Beginning Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberBeginningBalance	988637	shares
CY2013Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Ending Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberEndingBalance	1052844	shares
CY2014Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Ending Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberEndingBalance	988637	shares
CY2015Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Ending Balance ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberEndingBalance	878104	shares
CY2012Q3	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
CY2013Q3	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
CY2014Q3	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	42.22
CY2013Q3	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 Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value End Of Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueEndOfPeriod	42.22
CY2015Q3	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	48.24
CY2015Q3	ato	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailable	308582	shares
CY2014Q1	ato	Shares Issued At Overallotment Option SharesIssuedAtOverallotmentOption	1200000	shares
CY2013	ato	Stock Issued During Period Value Directors Stock For Fee Plan StockIssuedDuringPeriodValueDirectorsStockForFeePlan	80000	USD
CY2014	ato	Stock Issued During Period Value Directors Stock For Fee Plan StockIssuedDuringPeriodValueDirectorsStockForFeePlan	81000	USD
CY2015Q3	ato	Total Estimated Contractual Demand Fees TotalEstimatedContractualDemandFees	15256000	USD
CY2014	ato	Total Unrecognized In Net Periodic Pension Cost TotalUnrecognizedInNetPeriodicPensionCost	144004000	USD
CY2015	ato	Total Unrecognized In Net Periodic Pension Cost TotalUnrecognizedInNetPeriodicPensionCost	104537000	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
CY2015	ato	Undistributed Earnings From Discontinued Operations Allocated To Participating Securities UndistributedEarningsFromDiscontinuedOperationsAllocatedToParticipatingSecurities	0	USD
CY2014	ato	Unrecognized Actuarial Lossin Regulatory Assets UnrecognizedActuarialLossinRegulatoryAssets	151745000	USD
CY2015	ato	Unrecognized Prior Service Costin Regulatory Assets UnrecognizedPriorServiceCostinRegulatoryAssets	-6259000	USD
CY2014Q3	ato	Unrecognized Tax Benefits Deferred Federaland State Income Tax Benefits UnrecognizedTaxBenefitsDeferredFederalandStateIncomeTaxBenefits	4564000	USD
CY2015Q3	ato	Unrecognized Tax Benefits Deferred Federaland State Income Tax Benefits UnrecognizedTaxBenefitsDeferredFederalandStateIncomeTaxBenefits	6261000	USD
CY2015	ato	Unrecognized Actuarial Lossin Regulatory Assets UnrecognizedActuarialLossinRegulatoryAssets	110714000	USD
CY2014	ato	Unrecognized Prior Service Costin Regulatory Assets UnrecognizedPriorServiceCostinRegulatoryAssets	-8095000	USD
CY2015	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2014Q3	ato	Unrecognized Tax Benefits Gross UnrecognizedTaxBenefitsGross	13040000	USD
CY2015Q3	ato	Unrecognized Tax Benefits Gross UnrecognizedTaxBenefitsGross	17889000	USD
CY2014	ato	Unrecognized Transition Obligation In Regulatory Assets UnrecognizedTransitionObligationInRegulatoryAssets	354000	USD
CY2015	ato	Unrecognized Transition Obligation In Regulatory Assets UnrecognizedTransitionObligationInRegulatoryAssets	82000	USD
CY2015	ato	Weighted Average Cost Of Actual Heating Season Gas WeightedAverageCostOfActualHeatingSeasonGas	4.34
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
CY2015	ato	Weighted Average Number Of Diluted Shares Outstanding Discontinued Operations WeightedAverageNumberOfDilutedSharesOutstandingDiscontinuedOperations	101892000	shares
CY2015	dei	Amendment Flag AmendmentFlag	false
CY2015	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2015	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2015	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
CY2015	dei	Document Period End Date DocumentPeriodEndDate	2015-09-30
CY2015	dei	Document Type DocumentType	10-K
CY2015	dei	Entity Central Index Key EntityCentralIndexKey	0000731802
CY2015Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	101506645	shares
CY2015	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2015Q1	dei	Entity Public Float EntityPublicFloat	5500632050	USD
CY2015	dei	Entity Registrant Name EntityRegistrantName	Atmos Energy Corporation
CY2015	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2015	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2014Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	308086000	USD
CY2015Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	238942000	USD
CY2014Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	308086000	USD
CY2015Q3	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	238942000	USD
CY2014Q3	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	77860000	USD
CY2015Q3	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	78534000	USD
CY2014Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	367392000	USD
CY2015Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	310443000	USD
CY2014Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	343400000	USD
CY2015Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	295160000	USD
CY2014Q3	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	46445000	USD
CY2015Q3	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	47602000	USD
CY2014Q3	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	50801000	USD
CY2015Q3	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	40583000	USD
CY2014Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-12393000	USD
CY2015Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-109330000	USD
CY2014Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2180151000	USD
CY2015Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2230591000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17800000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25500000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	27500000	USD
CY2014Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	23992000	USD
CY2015Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	15283000	USD
CY2013	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	8480000	USD
CY2014	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	9409000	USD
CY2015	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5922000	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
CY2015	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
CY2014Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	10500000	USD
CY2015Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	11100000	USD
CY2014Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	10508000	USD
CY2015Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	9063000	USD
CY2014Q3	us-gaap	Assets Assets	8594704000	USD
CY2015Q3	us-gaap	Assets Assets	9092945000	USD
CY2014Q3	us-gaap	Assets Current AssetsCurrent	775840000	USD
CY2015Q3	us-gaap	Assets Current AssetsCurrent	630985000	USD
CY2014Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	178970000	USD
CY2015Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	127701000	USD
CY2014Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	79613000	USD
CY2015Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	74200000	USD
CY2014Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	12160000	USD
CY2015Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	8343000	USD
CY2014Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	13000	USD
CY2015Q3	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	542000	USD
CY2014Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	67466000	USD
CY2015Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	66399000	USD
CY2014Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	5542218000	USD
CY2015Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	5650185000	USD
CY2012Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	64239000	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
CY2015Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	28653000	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
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-13605000	USD
CY2015	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-19831000	USD
CY2013	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	2165000	USD
CY2014	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	-792000	USD
CY2015	us-gaap	Change In Unrealized Gain Loss On Fair Value Hedging Instruments1 ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1	10311000	USD
CY2013	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	15938000	USD
CY2014	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	2486000	USD
CY2015	us-gaap	Change In Unrealized Gain Loss On Hedged Item In Fair Value Hedge1 ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1	-9768000	USD
CY2014Q3	us-gaap	Commercial Paper CommercialPaper	196700000	USD
CY2015Q3	us-gaap	Commercial Paper CommercialPaper	457900000	USD
CY2013	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.40
CY2014	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.48
CY2015	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.56
CY2014Q3	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.005
CY2015Q3	us-gaap	Common Stock No Par Value CommonStockNoParValue	0.005
CY2014Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2015Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2014Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	100388092	shares
CY2015Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	101478818	shares
CY2014Q3	us-gaap	Common Stock Value CommonStockValue	502000	USD
CY2015Q3	us-gaap	Common Stock Value CommonStockValue	507000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	329679000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	238546000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	218138000	USD
CY2013	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	2463410000	USD
CY2014	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	3358490000	USD
CY2015	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	2462119000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8178000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5527000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	7251000	USD
CY2014Q3	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	9883000	USD
CY2015Q3	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	9316000	USD
CY2014Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	82085000	USD
CY2015Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	100232000	USD
CY2014Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2460000000	USD
CY2015Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	2460000000	USD
CY2015Q3	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	2669323000	USD
CY2014Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4014000	USD
CY2015Q3	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	4612000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	124836000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	169106000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	175897000	USD
CY2014Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	13698000	USD
CY2015Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	17873000	USD
CY2014Q3	us-gaap	Deferred Gas Cost DeferredGasCost	20069000	USD
CY2015Q3	us-gaap	Deferred Gas Cost DeferredGasCost	9715000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	141336000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	189952000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	192886000	USD
CY2014Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1742209000	USD
CY2015Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2001247000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9605000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	12375000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	12548000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	11400000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	413811000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	544886000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	10565000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	51067000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	406842000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	534014000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	236626000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	313224000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	28849000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	36695000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	21614000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	22281000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	116157000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	121619000	USD
CY2014Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6969000	USD
CY2015Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	10872000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1335367000	USD
CY2015Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1467233000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	48751000	USD
CY2015Q3	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	55918000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	1286616000	USD
CY2015Q3	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	1411315000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	37173000	USD
CY2015Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	31480000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1655894000	USD
CY2015Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1890886000	USD
CY2014Q3	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	31252000	USD
CY2015Q3	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	43634000	USD
CY2013	us-gaap	Depreciation And Amortization DepreciationAndAmortization	235079000	USD
CY2014	us-gaap	Depreciation And Amortization DepreciationAndAmortization	253987000	USD
CY2015	us-gaap	Depreciation And Amortization DepreciationAndAmortization	274796000	USD
CY2014Q3	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	46298000	USD
CY2015Q3	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	82509000	USD
CY2014Q3	us-gaap	Derivative Assets DerivativeAssets	58865000	USD
CY2015Q3	us-gaap	Derivative Assets DerivativeAssets	9600000	USD
CY2014Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	45827000	USD
CY2015Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	9232000	USD
CY2014Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	37009000	USD
CY2015Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-110507000	USD
CY2014Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	13038000	USD
CY2015Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	368000	USD
CY2014Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	22700000	USD
CY2015Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	8900000	USD
CY2013	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	3000000	USD
CY2014	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-5000000	USD
CY2015	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	15500000	USD
CY2014Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	21856000	USD
CY2015Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	120107000	USD
CY2014Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1730000	USD
CY2015Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	9568000	USD
CY2014Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	20126000	USD
CY2015Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	110539000	USD
CY2014Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	3100000	USD
CY2015Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	34600000	USD
CY2014Q3	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	72056000	USD
CY2015Q3	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	125983000	USD
CY2013	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	8203000	USD
CY2014	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	0	USD
CY2015	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
CY2014	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2015	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2013	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	11188000	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
CY2015	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	0	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
CY2015	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
CY2014	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	0	USD
CY2015	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	0	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
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	128115000	USD
CY2014	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	146248000	USD
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	160018000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.68
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.38
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.96
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.96
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.35
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.09
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.64
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.95
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.38
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.96
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.96
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.35
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.09
CY2015Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	10200000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y6M0D
CY2014Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	278917000	USD
CY2015Q3	us-gaap	Energy Related Inventory Gas Stored Underground EnergyRelatedInventoryGasStoredUnderground	236603000	USD
CY2013	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	97000	USD
CY2014	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	198000	USD
CY2015	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	-325000	USD
CY2013	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	18103000	USD
CY2014	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	1694000	USD
CY2015	us-gaap	Gain Loss On Fair Value Hedges Recognized In Earnings GainLossOnFairValueHedgesRecognizedInEarnings	543000	USD
CY2014Q3	us-gaap	Goodwill Goodwill	742029000	USD
CY2015Q3	us-gaap	Goodwill Goodwill	742702000	USD
CY2015	us-gaap	Goodwill Other Changes GoodwillOtherChanges	673000	USD
CY2013	us-gaap	Gross Profit GrossProfit	1412050000	USD
CY2013Q4	us-gaap	Gross Profit GrossProfit	388957000	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
CY2014	us-gaap	Gross Profit GrossProfit	1582426000	USD
CY2014Q4	us-gaap	Gross Profit GrossProfit	423285000	USD
CY2015Q1	us-gaap	Gross Profit GrossProfit	520738000	USD
CY2015Q2	us-gaap	Gross Profit GrossProfit	381673000	USD
CY2015Q3	us-gaap	Gross Profit GrossProfit	354321000	USD
CY2015	us-gaap	Gross Profit GrossProfit	1680017000	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
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	510765000	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
CY2015	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	315075000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.54
CY2014	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.96
CY2015	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.09
CY2013	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.50
CY2014	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.96
CY2015	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.09
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	12496000	USD
CY2014	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.14
CY2014	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
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
CY2015	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	142599000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	187002000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	195690000	USD
CY2014Q3	us-gaap	Income Tax Receivable IncomeTaxReceivable	5481000	USD
CY2015Q3	us-gaap	Income Tax Receivable IncomeTaxReceivable	4479000	USD
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1085000	USD
CY2014	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	6969000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	4998000	USD
CY2013	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	2153000	USD
CY2014	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	2307000	USD
CY2015	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	2413000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	130655000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	166887000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	178768000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1453000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3817000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1468000	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
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	12869000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10008000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-610000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1802000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	31912000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	55041000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-52660000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	73669000	USD
CY2014	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	41408000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-48240000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-31979000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	31996000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-33234000	USD
CY2013	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-15644000	USD
CY2014	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	24411000	USD
CY2014	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-19552000	USD
CY2015	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-56025000	USD
CY2013	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	1178000	shares
CY2014	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	2000	shares
CY2015	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	0	shares
CY2015	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	11951000	USD
CY2013	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-44491000	USD
CY2014	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	2413000	USD
CY2015	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	896000	USD
CY2013	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-111069000	USD
CY2014	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-30662000	USD
CY2015	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-58256000	USD
CY2013	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-96658000	USD
CY2013	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1900000	USD
CY2014	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1500000	USD
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2300000	USD
CY2013	us-gaap	Interest Expense InterestExpense	128385000	USD
CY2014	us-gaap	Interest Expense InterestExpense	129295000	USD
CY2015	us-gaap	Interest Expense InterestExpense	116241000	USD
CY2013	us-gaap	Interest Paid InterestPaid	148461000	USD
CY2014	us-gaap	Interest Paid InterestPaid	156606000	USD
CY2015	us-gaap	Interest Paid InterestPaid	151334000	USD
CY2014Q3	us-gaap	Interest Payable Current InterestPayableCurrent	36768000	USD
CY2015Q3	us-gaap	Interest Payable Current InterestPayableCurrent	34914000	USD
CY2013	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-3489000	USD
CY2014	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-4230000	USD
CY2015	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-853000	USD
CY2014Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8594704000	USD
CY2015Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	9092945000	USD
CY2014Q3	us-gaap	Liabilities Current LiabilitiesCurrent	910650000	USD
CY2015Q3	us-gaap	Liabilities Current LiabilitiesCurrent	1154823000	USD
CY2015Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1300000000	USD
CY2015Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1760000000	USD
CY2015Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2015Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2015Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	450000000	USD
CY2015Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2015Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	250000000	USD
CY2014Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2455986000	USD
CY2015Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2455388000	USD
CY2014Q3	us-gaap	Marketable Securities MarketableSecurities	79613000	USD
CY2015Q3	us-gaap	Marketable Securities MarketableSecurities	74200000	USD
CY2015	us-gaap	Maximum Length Of Time Hedged In Cash Flow Hedge1 MaximumLengthOfTimeHedgedInCashFlowHedge1	P0Y49M0D
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
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	124631000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-696914000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-837576000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-974755000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	613127000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	739986000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	836519000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	243194000	USD
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	87016000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	133367000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	45721000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	23713000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	289817000	USD
CY2014Q4	us-gaap	Net Income Loss NetIncomeLoss	97595000	USD
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	137684000	USD
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	56281000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	23515000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	315075000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	229923000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	289106000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	314449000	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
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	314449000	USD
CY2015	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2015Q3	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	8	state
CY2013	us-gaap	Operating Expenses OperatingExpenses	910171000	USD
CY2014	us-gaap	Operating Expenses OperatingExpenses	971077000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	1048622000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	501879000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	170720000	USD
CY2014Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	250080000	USD
CY2014Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	106605000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	83944000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	611349000	USD
CY2014Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	187725000	USD
CY2015Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	250210000	USD
CY2015Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	117607000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	75853000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	631395000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	140713000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	16475000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	14251000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	15207000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	16490000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	16639000	USD
CY2015Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	61651000	USD
CY2013	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	32400000	USD
CY2014	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	31700000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	32500000	USD
CY2014Q3	us-gaap	Other Assets Current OtherAssetsCurrent	111265000	USD
CY2015Q3	us-gaap	Other Assets Current OtherAssetsCurrent	70569000	USD
CY2014Q3	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	9145000	USD
CY2015Q3	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	6822000	USD
CY2014Q3	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	14340000	USD
CY2015Q3	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	13664000	USD
CY2014Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	350929000	USD
CY2015Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	288678000	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 Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2214000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2713000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-53485000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-94224000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	86485000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-51271000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-96937000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	86485000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-51271000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-96937000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-186000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1199000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1559000	USD
CY2013	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	679000	USD
CY2014	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	969000	USD
CY2015	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	1209000	USD
CY2014Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	405869000	USD
CY2015Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	457954000	USD
CY2014Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	68870000	USD
CY2015Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	161696000	USD
CY2013	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	2887000	USD
CY2014	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	428000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	850000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-197000	USD
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-5235000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-4389000	USD
CY2013	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	488020000	USD
CY2014	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	505154000	USD
CY2015	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	541868000	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
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	975132000	USD
CY2014Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	11380000	USD
CY2015Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	21857000	USD
CY2014Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	340963000	USD
CY2014	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	8717000	USD
CY2015	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	7985000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	128115000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	146248000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	160018000	USD
CY2013	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	845033000	USD
CY2014	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	835251000	USD
CY2015	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	-13364000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4904000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2325000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-377000	USD
CY2013	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	5150000	USD
CY2015Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	287373000	USD
CY2014Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	25039000	USD
CY2015Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	27734000	USD
CY2014Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	390200000	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	390205000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	493793000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	493538000	USD
CY2013	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	46000	USD
CY2014	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	4274000	USD
CY2015	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	30952000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-208070000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-165865000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	254780000	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
CY2015	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1721794000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1809520000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Amount Of Acquisition Adjustments1 PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1	-76400000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Amount Of Acquisition Adjustments1 PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1	-68100000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Common PublicUtilitiesPropertyPlantAndEquipmentCommon	735223000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Common PublicUtilitiesPropertyPlantAndEquipmentCommon	769311000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	247579000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	280398000	USD
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
CY2015	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.033
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	5522794000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	6019001000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	4821000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	131000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	6725906000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	7430580000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	38858000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	41131000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	8447700000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	9240100000	USD
CY2014Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	1622846000	USD
CY2015Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	1844117000	USD
CY2014Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	35063000	USD
CY2015Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	28100000	USD
CY2013	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	3875460000	USD
CY2013Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1243858000	USD
CY2014Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1964854000	USD
CY2014Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	943170000	USD
CY2014Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	789034000	USD
CY2014	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	4940916000	USD
CY2014Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1258765000	USD
CY2015Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	1540068000	USD
CY2015Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	686401000	USD
CY2015Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	656902000	USD
CY2015	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	4142136000	USD
CY2014Q3	us-gaap	Regulatory Assets RegulatoryAssets	250309000	USD
CY2015Q3	us-gaap	Regulatory Assets RegulatoryAssets	192339000	USD
CY2014Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	230240000	USD
CY2015Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	182573000	USD
CY2014Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	545759000	USD
CY2015Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	524532000	USD
CY2014Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4472000	USD
CY2015Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	3693000	USD
CY2015	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P15Y
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	131000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	500000000	USD
CY2014Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	917972000	USD
CY2015Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1073029000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	17814000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	25531000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	27491000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	25718	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	4113	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	3388	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
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
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	48.55
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
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	444543	shares
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
CY2015	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	50.50
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	657795	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	524532	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	551688	shares
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
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
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	21700000	USD
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
CY2015	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	39.28
CY2015Q3	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
CY2015Q3	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
CY2015Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	457927000	USD
CY2014Q1	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	9200000	shares
CY2015	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	20326000	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	-50000	USD
CY2014	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	4067000	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	10626000	USD
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	390205000	USD
CY2013	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	8788000	USD
CY2014	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	4353000	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	2266000	USD
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	15934000	USD
CY2014	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	23536000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	25212000	USD
CY2013	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	5150000	USD
CY2014	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	8717000	USD
CY2015	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	7985000	USD
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	387991	shares
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	12500000	USD
CY2012Q3	us-gaap	Stockholders Equity StockholdersEquity	2359243000	USD
CY2013Q3	us-gaap	Stockholders Equity StockholdersEquity	2580409000	USD
CY2014Q3	us-gaap	Stockholders Equity StockholdersEquity	3086232000	USD
CY2015Q3	us-gaap	Stockholders Equity StockholdersEquity	3194797000	USD
CY2014Q3	us-gaap	Supplies Supplies	5704000	USD
CY2015Q3	us-gaap	Supplies Supplies	12587000	USD
CY2013	us-gaap	Taxes Other TaxesOther	187072000	USD
CY2014	us-gaap	Taxes Other TaxesOther	211936000	USD
CY2015	us-gaap	Taxes Other TaxesOther	231958000	USD
CY2014Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	77601000	USD
CY2015Q3	us-gaap	Taxes Payable Current TaxesPayableCurrent	93674000	USD
CY2015Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11628000	USD
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91711000	shares
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3431000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3846000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1009000	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8476000	USD
CY2013	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	775000	USD
CY2014	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	711000	USD
CY2015	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	626000	USD
CY2013	us-gaap	Unrealized Gain Loss On Price Risk Fair Value Hedging Instruments UnrealizedGainLossOnPriceRiskFairValueHedgingInstruments	9000000	USD
CY2014	us-gaap	Unrealized Gain Loss On Price Risk Fair Value Hedging Instruments UnrealizedGainLossOnPriceRiskFairValueHedgingInstruments	9600000	USD
CY2015	us-gaap	Unrealized Gain Loss On Price Risk Fair Value Hedging Instruments UnrealizedGainLossOnPriceRiskFairValueHedgingInstruments	-2400000	USD
CY2013Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4158000	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12629000	USD
CY2015Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	17069000	USD
CY2014Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	411000	USD
CY2015Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	820000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4625000	USD
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	97608000	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	101892000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	90533000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	97606000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	101892000	shares
CY2015	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>
CY2015	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. We record the cash flow impact of our financial instruments in operating cash flows based upon their balance sheet classification.</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 purchased gas cost 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. For the fiscal years ended </font><font style="font-family:inherit;font-size:10pt;">September 30, 2015</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">2014</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2013</font><font style="font-family:inherit;font-size:10pt;">, we included unrealized gains (losses) on open contracts of </font><font style="font-family:inherit;font-size:10pt;">$(2.4) million</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">$9.6 million</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">$9.0 million</font><font style="font-family:inherit;font-size:10pt;"> as a component of nonregulated 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;">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, 2015</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2014</font><font style="font-family:inherit;font-size:10pt;">, the Company netted $</font><font style="font-family:inherit;font-size:10pt;">43.5 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;">25.8 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 currently manage this risk through the use of forward starting interest rate swaps 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>
CY2015	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 serving approximately </font><font style="font-family:inherit;font-size:10pt;">148,000</font><font style="font-family:inherit;font-size:10pt;"> customers in Georgia, Illinois, Iowa and Missouri.</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>
CY2015	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>
CY2015	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, contingency accruals, pension and postretirement obligations, deferred income taxes, 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>

Files In Submission

Name	View Source	Status
0000731802-15-000030-index-headers.html	Edgar Link	pending
0000731802-15-000030-index.html	Edgar Link	pending
0000731802-15-000030.txt	Edgar Link	pending
0000731802-15-000030-xbrl.zip	Edgar Link	pending
ato-20150930.xml	Edgar Link	completed
ato-20150930.xsd	Edgar Link	pending
ato-20150930_cal.xml	Edgar Link	unprocessable
ato-20150930_def.xml	Edgar Link	unprocessable
ato-20150930_lab.xml	Edgar Link	unprocessable
ato-20150930_pre.xml	Edgar Link	unprocessable
ato2015093010-k.htm	Edgar Link	pending
ato20150930ex-1013b.htm	Edgar Link	pending
ato20150930ex-1013c.htm	Edgar Link	pending
ato20150930ex-108a.htm	Edgar Link	pending
ato20150930ex-12.htm	Edgar Link	pending
ato20150930ex-21.htm	Edgar Link	pending
ato20150930ex-231.htm	Edgar Link	pending
ato20150930ex-31.htm	Edgar Link	pending
ato20150930ex-32.htm	Edgar Link	pending
ato2015093_chart-51733.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$ATO
ATMOS ENERGY CORP Stock $ato

2015 Q4 Form 10-K Financial Statement

#000073180215000030 Filed on November 06, 2015

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATO ATMOS ENERGY CORP Stock $ato

2015 Q4 Form 10-K Financial Statement

#000073180215000030 Filed on November 06, 2015

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ATO
ATMOS ENERGY CORP Stock $ato