Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014 segment	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Number of operating segments	3us-gaap_NumberOfOperatingSegments
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	$ 1,258,765	$ 1,243,858
Purchased gas cost	835,480us-gaap_CostOfNaturalGasPurchases	854,901us-gaap_CostOfNaturalGasPurchases
Gross profit	423,285us-gaap_GrossProfit	388,957us-gaap_GrossProfit
Operating expenses
Operation and maintenance	118,582	115,757
Depreciation and amortization	67,593us-gaap_DepreciationAndAmortization	60,469us-gaap_DepreciationAndAmortization
Taxes, other than income	49,385us-gaap_TaxesOther	42,011us-gaap_TaxesOther
Total operating expenses	235,560us-gaap_OperatingExpenses	218,237us-gaap_OperatingExpenses
Operating income	187,725us-gaap_OperatingIncomeLoss	170,720us-gaap_OperatingIncomeLoss
Miscellaneous income (expense)	(1,707)us-gaap_OtherNonoperatingIncomeExpense	(2,132)us-gaap_OtherNonoperatingIncomeExpense
Interest charges	29,764us-gaap_InterestExpense	32,115us-gaap_InterestExpense
Income (loss) before income taxes	156,254	136,473
Income tax expense (benefit)	58,659us-gaap_IncomeTaxExpenseBenefit	49,457us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	97,595us-gaap_NetIncomeLoss	87,016us-gaap_NetIncomeLoss
Capital expenditures	261,313	180,567
ASSETS
Net property, plant and equipment	6,912,541us-gaap_PropertyPlantAndEquipmentNet		6,725,906us-gaap_PropertyPlantAndEquipmentNet
Investment in subsidiaries	0ato_InvestmentInSubsidaries		0ato_InvestmentInSubsidaries
Current assets
Cash and cash equivalents	123,832	194,563	42,258	66,199
Assets from risk management activities	18,254us-gaap_DerivativeAssetsCurrent		45,827us-gaap_DerivativeAssetsCurrent
Other current assets	976,678		687,755
Intercompany receivables	0ato_IntercompanyReceivables		0ato_IntercompanyReceivables
Total current assets	1,118,764us-gaap_AssetsCurrent		775,840us-gaap_AssetsCurrent
Goodwill	742,029us-gaap_Goodwill		742,029us-gaap_Goodwill
Noncurrent assets from risk management activities	124us-gaap_DerivativeAssetsNoncurrent		13,038us-gaap_DerivativeAssetsNoncurrent
Deferred charges and other assets	341,635		337,891
Total Assets	9,115,093us-gaap_Assets		8,594,704us-gaap_Assets
CAPITALIZATION AND LIABILITIES
Shareholders' equity	3,063,925us-gaap_StockholdersEquity		3,086,232us-gaap_StockholdersEquity
Long-term debt	2,455,131us-gaap_LongTermDebtNoncurrent		2,455,986us-gaap_LongTermDebtNoncurrent
Total capitalization	5,519,056		5,542,218
Current liabilities
Short-term debt	550,903us-gaap_ShortTermBorrowings		196,695us-gaap_ShortTermBorrowings
Liabilities from risk management activities	13,701us-gaap_DerivativeLiabilitiesCurrent		1,730us-gaap_DerivativeLiabilitiesCurrent
Other current liabilities	856,007		712,225
Intercompany payables	0ato_IntercompanyPayables		0ato_IntercompanyPayables
Total current liabilities	1,420,611us-gaap_LiabilitiesCurrent		910,650us-gaap_LiabilitiesCurrent
Deferred income taxes	1,256,443us-gaap_DeferredIncomeTaxLiabilities		1,286,616us-gaap_DeferredIncomeTaxLiabilities
Derivative Liability, Noncurrent	82,123us-gaap_DerivativeLiabilitiesNoncurrent		20,126us-gaap_DerivativeLiabilitiesNoncurrent
Regulatory cost of removal obligation	443,931ato_RegulatoryCostOfRemovalObligation		445,387ato_RegulatoryCostOfRemovalObligation
Pension and postretirement liabilities	345,350		340,963
Deferred credits and other liabilities	47,579		48,744
Total Equity and Liabilities	9,115,093		8,594,704
Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	1,258,765	1,243,858
Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	0	0
Regulated Distribution Segment [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	846,772	843,865
Purchased gas cost	522,960	544,694
Gross profit	323,812	299,171
Operating expenses
Operation and maintenance	86,985	89,663
Depreciation and amortization	55,086	49,551
Taxes, other than income	43,644	37,084
Total operating expenses	185,715	176,298
Operating income	138,097	122,873
Miscellaneous income (expense)	(1,329)	(471)
Interest charges	21,640	23,325
Income (loss) before income taxes	115,128	99,077
Income tax expense (benefit)	43,741	36,320
Net income (loss)	71,387	62,757
Capital expenditures	166,247	127,506
ASSETS
Net property, plant and equipment	5,310,469		5,202,761
Investment in subsidiaries	949,428		952,171
Current assets
Cash and cash equivalents	79,345		33,303
Assets from risk management activities	852		23,102
Other current assets	733,736		490,408
Intercompany receivables	835,928		790,442
Total current assets	1,649,861		1,337,255
Goodwill	574,816		574,816
Noncurrent assets from risk management activities	124		13,038
Deferred charges and other assets	316,704		309,965
Total Assets	8,801,402		8,390,006
CAPITALIZATION AND LIABILITIES
Shareholders' equity	3,063,925		3,086,232
Long-term debt	2,455,131		2,455,986
Total capitalization	5,519,056		5,542,218
Current liabilities
Short-term debt	791,503		522,695
Liabilities from risk management activities	13,701		1,730
Other current liabilities	675,685		559,765
Intercompany payables	0		0
Total current liabilities	1,480,889		1,084,190
Deferred income taxes	887,452		913,260
Derivative Liability, Noncurrent	82,123		20,126
Regulatory cost of removal obligation	443,931		445,387
Pension and postretirement liabilities	345,350		340,963
Deferred credits and other liabilities	42,601		43,862
Total Equity and Liabilities	8,801,402		8,390,006
Regulated Distribution Segment [Member] \| Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	845,404	842,432
Regulated Distribution Segment [Member] \| Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	1,368	1,433
Regulated Pipeline Segment [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	83,567	71,341
Purchased gas cost	0	0
Gross profit	83,567	71,341
Operating expenses
Operation and maintenance	24,615	17,300
Depreciation and amortization	11,382	9,786
Taxes, other than income	4,865	4,663
Total operating expenses	40,862	31,749
Operating income	42,705	39,592
Miscellaneous income (expense)	(252)	(1,181)
Interest charges	8,324	8,957
Income (loss) before income taxes	34,129	29,454
Income tax expense (benefit)	12,094	10,008
Net income (loss)	22,035	19,446
Capital expenditures	94,754	52,921
ASSETS
Net property, plant and equipment	1,544,320		1,464,572
Investment in subsidiaries	0		0
Current assets
Cash and cash equivalents	0		0
Assets from risk management activities	0		0
Other current assets	13,881		14,009
Intercompany receivables	0		0
Total current assets	13,881		14,009
Goodwill	132,502		132,502
Noncurrent assets from risk management activities	0		0
Deferred charges and other assets	19,578		21,826
Total Assets	1,710,281		1,632,909
CAPITALIZATION AND LIABILITIES
Shareholders' equity	504,648		482,612
Long-term debt	0		0
Total capitalization	504,648		482,612
Current liabilities
Short-term debt	0		0
Liabilities from risk management activities	0		0
Other current liabilities	23,722		24,790
Intercompany payables	805,723		763,635
Total current liabilities	829,445		788,425
Deferred income taxes	376,018		361,688
Derivative Liability, Noncurrent	0		0
Regulatory cost of removal obligation	0		0
Pension and postretirement liabilities	0		0
Deferred credits and other liabilities	170		184
Total Equity and Liabilities	1,710,281		1,632,909
Regulated Pipeline Segment [Member] \| Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	20,551	21,170
Regulated Pipeline Segment [Member] \| Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	63,016	50,171
Nonregulated Segment [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	462,288	436,431
Purchased gas cost	446,249	417,865
Gross profit	16,039	18,566
Operating expenses
Operation and maintenance	7,115	8,915
Depreciation and amortization	1,125	1,132
Taxes, other than income	876	264
Total operating expenses	9,116	10,311
Operating income	6,923	8,255
Miscellaneous income (expense)	300	324
Interest charges	226	637
Income (loss) before income taxes	6,997	7,942
Income tax expense (benefit)	2,824	3,129
Net income (loss)	4,173	4,813
Capital expenditures	312	140
ASSETS
Net property, plant and equipment	57,752		58,573
Investment in subsidiaries	(2,096)		(2,096)
Current assets
Cash and cash equivalents	44,487		8,955
Assets from risk management activities	17,402		22,725
Other current assets	500,168		526,161
Intercompany receivables	0		0
Total current assets	562,057		557,841
Goodwill	34,711		34,711
Noncurrent assets from risk management activities	0		0
Deferred charges and other assets	5,353		6,100
Total Assets	657,777		655,129
CAPITALIZATION AND LIABILITIES
Shareholders' equity	444,780		469,559
Long-term debt	0		0
Total capitalization	444,780		469,559
Current liabilities
Short-term debt	0		0
Liabilities from risk management activities	0		0
Other current liabilities	185,011		142,397
Intercompany payables	30,205		26,807
Total current liabilities	215,216		169,204
Deferred income taxes	(7,027)		11,668
Derivative Liability, Noncurrent	0		0
Regulatory cost of removal obligation	0		0
Pension and postretirement liabilities	0		0
Deferred credits and other liabilities	4,808		4,698
Total Equity and Liabilities	657,777		655,129
Nonregulated Segment [Member] \| Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	392,810	380,256
Nonregulated Segment [Member] \| Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	69,478	56,175
Intersegment Elimination [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	(133,862)	(107,779)
Purchased gas cost	(133,729)	(107,658)
Gross profit	(133)	(121)
Operating expenses
Operation and maintenance	(133)	(121)
Depreciation and amortization	0	0
Taxes, other than income	0	0
Total operating expenses	(133)	(121)
Operating income	0	0
Miscellaneous income (expense)	(426)	(804)
Interest charges	(426)	(804)
Income (loss) before income taxes	0	0
Income tax expense (benefit)	0	0
Net income (loss)	0	0
Capital expenditures	0	0
ASSETS
Net property, plant and equipment	0		0
Investment in subsidiaries	(947,332)		(950,075)
Current assets
Cash and cash equivalents	0		0
Assets from risk management activities	0		0
Other current assets	(271,107)		(342,823)
Intercompany receivables	(835,928)		(790,442)
Total current assets	(1,107,035)		(1,133,265)
Goodwill	0		0
Noncurrent assets from risk management activities	0		0
Deferred charges and other assets	0		0
Total Assets	(2,054,367)		(2,083,340)
CAPITALIZATION AND LIABILITIES
Shareholders' equity	(949,428)		(952,171)
Long-term debt	0		0
Total capitalization	(949,428)		(952,171)
Current liabilities
Short-term debt	(240,600)		(326,000)
Liabilities from risk management activities	0		0
Other current liabilities	(28,411)		(14,727)
Intercompany payables	(835,928)		(790,442)
Total current liabilities	(1,104,939)		(1,131,169)
Deferred income taxes	0		0
Derivative Liability, Noncurrent	0		0
Regulatory cost of removal obligation	0		0
Pension and postretirement liabilities	0		0
Deferred credits and other liabilities	0		0
Total Equity and Liabilities	(2,054,367)		(2,083,340)
Intersegment Elimination [Member] \| Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	0	0
Intersegment Elimination [Member] \| Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	$ (133,862)	$ (107,779)

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