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Financial Instruments Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Interest rate agreements fair value $ (32,755)ato_OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax $ (27,718)ato_OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax $ (84,824)ato_OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax $ (14,448)ato_OtherComprehensiveIncomeUnrealizedGainLossOnTreasuryLocksArisingDuringPeriodNetOfTax
Forward commodity contracts fair value (10,160)ato_OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax 5,483ato_OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax (38,902)ato_OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax 11,709ato_OtherComprehensiveIncomeUnrealizedGainLossOnForwardCommodityContractsArisingDuringPeriodNetOfTax
Interest rate agreements 86ato_OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax 671ato_OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax 368ato_OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax 1,343ato_OtherComprehensiveIncomeReclassificationAdjustmentOnTreasuryLocksIncludedInNetIncomeNetOfTax
Forward commodity contracts 7,978ato_OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax (4,382)ato_OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax 7,768ato_OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax (2,790)ato_OtherComprehensiveIncomeReclassificationAdjustmentOnForwardCommodityContractsIncludedInNetIncomeNetOfTax
Total other comprehensive income (loss) from hedging, net of tax (34,851)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax [1] (25,946)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax [1] (115,590)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax [1] (4,186)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax [1]
Expected Earnings [Line Items]        
Interest Rate Agreement Gain (Loss) Reclassified To Earnings     (18,824)ato_InterestRateAgreementGainLossReclassifiedToEarnings [2]  
Commodity Contract Gain (Loss) Reclassified To Earnings     (32,808)ato_CommodityContractGainLossReclassifiedToEarnings [2]  
Total Hedge Gain (Loss) Reclassified To Earnings     (51,632)ato_TotalHedgeGainLossReclassifiedToEarnings  
Next Twelve Months [Member]        
Expected Earnings [Line Items]        
Interest Rate Agreement Gain (Loss) Reclassified To Earnings     (347)ato_InterestRateAgreementGainLossReclassifiedToEarnings
/ ato_ExpectedRecognitionInEarningsOfDeferredGainLossesFinancialInstrumentsAxis
= ato_NextTwelveMonthsMember
 
Commodity Contract Gain (Loss) Reclassified To Earnings     (25,826)ato_CommodityContractGainLossReclassifiedToEarnings
/ ato_ExpectedRecognitionInEarningsOfDeferredGainLossesFinancialInstrumentsAxis
= ato_NextTwelveMonthsMember
 
Total Hedge Gain (Loss) Reclassified To Earnings     (26,173)ato_TotalHedgeGainLossReclassifiedToEarnings
/ ato_ExpectedRecognitionInEarningsOfDeferredGainLossesFinancialInstrumentsAxis
= ato_NextTwelveMonthsMember
 
Thereafter [Member]        
Expected Earnings [Line Items]        
Interest Rate Agreement Gain (Loss) Reclassified To Earnings     (18,477)ato_InterestRateAgreementGainLossReclassifiedToEarnings
/ ato_ExpectedRecognitionInEarningsOfDeferredGainLossesFinancialInstrumentsAxis
= ato_ThereafterMember
 
Commodity Contract Gain (Loss) Reclassified To Earnings     (6,982)ato_CommodityContractGainLossReclassifiedToEarnings
/ ato_ExpectedRecognitionInEarningsOfDeferredGainLossesFinancialInstrumentsAxis
= ato_ThereafterMember
 
Total Hedge Gain (Loss) Reclassified To Earnings     $ (25,459)ato_TotalHedgeGainLossReclassifiedToEarnings
/ ato_ExpectedRecognitionInEarningsOfDeferredGainLossesFinancialInstrumentsAxis
= ato_ThereafterMember
 
[1] Utilizing an income tax rate ranging from 37 percent to 39 percent based on the effective rates in each taxing jurisdiction.
[2] (1) Utilizing an income tax rate ranging from 37 percent to 39 percent based on the effective rates in each taxing jurisdiction.