CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 184,223us-gaap_NetIncomeLoss	$ 180,664us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash flows from operating activities:
Unrealized (gain) loss on derivative instruments	(20,198)us-gaap_UnrealizedGainLossOnDerivatives	52,394us-gaap_UnrealizedGainLossOnDerivatives
Depreciation and amortization	29,590	25,394
Allowance for equity used during construction	(2,014)	(603)
Allowance for bad debt expense	1,696us-gaap_ProvisionForDoubtfulAccounts	1,205us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	31,576us-gaap_DeferredIncomeTaxExpenseBenefit	22,970us-gaap_DeferredIncomeTaxExpenseBenefit
Manufactured gas plant remediation costs	(2,089)	(1,845)
Equity in earnings of equity investees, net of distributions received	4,089	1,626
Cost of removal - asset retirement obligations	(403)	(164)
Contributions to postemployment benefit plans	(2,434)	(2,348)
Changes in:
Components of working capital	42,506	96,040
Other noncurrent assets	39,396	6,038
Other noncurrent liabilities	20,568	2,071
Cash flows from operating activities	326,506	383,442
CASH FLOWS (USED IN) INVESTING ACTIVITIES
Utility plant expenditures	(58,657)	(59,971)
Solar and wind equipment expenditures	(88,370)	(45,403)
Real estate properties and other expenditures	(61)	(477)
Cost of removal expenditures	(11,334)	(10,914)
Investments in equity investees	(1,264)	0
Distribution from equity investees in excess of equity in earnings	957	464
Proceeds from sale of asset	0	6,000
(Payment to) withdrawal from restricted cash construction fund	(1,484)	85
Cash flows (used in) investing activities	(160,213)	(110,216)
CASH FLOWS (USED IN) FINANCING ACTIVITIES
Proceeds from issuance of common stock	28,310	7,757
Tax benefit from stock options exercised	839	94
Proceeds from sale-leaseback transaction	7,216	7,576
Proceeds from long-term debt	100,000	125,000
Payments of long-term debt	(4,510)us-gaap_RepaymentsOfLongTermDebt	(65,017)us-gaap_RepaymentsOfLongTermDebt
Purchases of treasury stock	(3,945)	(4,387)
Payments of common stock dividends	(38,010)us-gaap_PaymentsOfDividendsCommonStock	(35,264)us-gaap_PaymentsOfDividendsCommonStock
Net payments of short-term debt	(155,000)	(302,400)
Cash flows (used in) financing activities	(65,100)	(266,641)
Change in cash and cash equivalents	101,193	6,585
Cash and cash equivalents at beginning of period	2,151	2,969
Cash and cash equivalents at end of period	103,344	9,554
CHANGES IN COMPONENTS OF WORKING CAPITAL
Receivables	(178,647)	(294,939)
Inventories	205,992us-gaap_IncreaseDecreaseInInventories	178,955us-gaap_IncreaseDecreaseInInventories
Recovery of gas costs	15,734	6,866
Gas purchases payable	24,827	137,947
Gas purchases payable - related parties	155	97
Prepaid and accrued taxes	39,169	67,164
Accounts payable and other	(35,456)	3,992
Restricted broker margin accounts	(16,707)	(21,329)
Customers' credit balances and deposits	(5,821)	(8,819)
Other current assets	(6,740)	26,106
Components of working capital	42,506	96,040
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION
Cash paid for Interest (net of amounts capitalized)	12,946us-gaap_InterestPaidNet	11,221us-gaap_InterestPaidNet
Cash paid for Income taxes	14,719us-gaap_IncomeTaxesPaid	8,648us-gaap_IncomeTaxesPaid
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING ACTIVITIES
Accrued capital expenditures	$ 26,781	$ 1,347

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Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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