CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014
ASSETS
Property, plant and equipment	$ 8,789,599us-gaap_PropertyPlantAndEquipmentGross	$ 8,447,700us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	1,763,521	1,721,794
Net property, plant and equipment	7,026,078us-gaap_PropertyPlantAndEquipmentNet	6,725,906us-gaap_PropertyPlantAndEquipmentNet
Current assets
Cash and cash equivalents	95,525	42,258
Accounts receivable, net	511,830us-gaap_AccountsReceivableNetCurrent	343,400us-gaap_AccountsReceivableNetCurrent
Gas stored underground	143,154	278,917
Other current assets	67,128us-gaap_OtherAssetsCurrent	111,265us-gaap_OtherAssetsCurrent
Total current assets	817,637us-gaap_AssetsCurrent	775,840us-gaap_AssetsCurrent
Goodwill	742,029us-gaap_Goodwill	742,029us-gaap_Goodwill
Deferred charges and other assets	340,900us-gaap_OtherAssetsNoncurrent	350,929us-gaap_OtherAssetsNoncurrent
Total assets	8,926,644us-gaap_Assets	8,594,704us-gaap_Assets
Shareholders' equity
Common stock, no par value (stated at $.005 per share)	505us-gaap_CommonStockValue	502us-gaap_CommonStockValue
Additional paid-in capital	2,192,100	2,180,151
Retained earnings	1,075,177	917,972
Accumulated other comprehensive income (loss)	(128,088)	(12,393)
Shareholders' equity	3,139,694us-gaap_StockholdersEquity	3,086,232us-gaap_StockholdersEquity
Long-term debt	2,455,217us-gaap_LongTermDebtNoncurrent	2,455,986us-gaap_LongTermDebtNoncurrent
Total capitalization	5,594,911	5,542,218
Current liabilities
Accounts payable and accrued liabilities	295,589	308,086
Other current liabilities	497,927us-gaap_OtherLiabilitiesCurrent	405,869us-gaap_OtherLiabilitiesCurrent
Short-term debt	224,986us-gaap_ShortTermBorrowings	196,695us-gaap_ShortTermBorrowings
Total current liabilities	1,018,502us-gaap_LiabilitiesCurrent	910,650us-gaap_LiabilitiesCurrent
Deferred income taxes	1,338,755us-gaap_DeferredIncomeTaxLiabilities	1,286,616us-gaap_DeferredIncomeTaxLiabilities
Regulatory cost of removal obligation	441,655ato_RegulatoryCostOfRemovalLiability	445,387ato_RegulatoryCostOfRemovalLiability
Pension and postretirement liabilities	350,889	340,963
Deferred credits and other liabilities	181,932us-gaap_OtherLiabilitiesNoncurrent	68,870us-gaap_OtherLiabilitiesNoncurrent
Total shareholders' equity and liabilities	$ 8,926,644	$ 8,594,704

Reflects the total obligation as of the balance sheet date to remove regulatory assets from service

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Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Carrying amount as of the balance sheet date of natural gas stored underground in depleted gas reservoirs, aquifers, or salt caverns to meet seasonal and peak load demands, and also as insurance against unforeseen supply disruptions, and deemed to be a current asset because it is expected to be used within twelve months or in the normal operating cycle.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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