CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES
Net income	$ 123,320us-gaap_NetIncomeLoss	$ 7,693us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash flows from operating activities:
Unrealized (gain) loss on derivative instruments	(88,673)us-gaap_UnrealizedGainLossOnDerivatives	65,654us-gaap_UnrealizedGainLossOnDerivatives
Depreciation and amortization	14,386	12,566
Allowance for equity used during construction	(1,253)	(213)
Allowance for bad debt expense	964us-gaap_ProvisionForDoubtfulAccounts	414us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	35,897us-gaap_DeferredIncomeTaxExpenseBenefit	(16,506)us-gaap_DeferredIncomeTaxExpenseBenefit
Manufactured gas plant remediation costs	(1,008)	(1,132)
Equity in earnings of equity investees, net of distributions received	2,146	1,521
Cost of removal - asset retirement obligations	(105)	(47)
Contributions to postemployment benefit plans	(69)	(1,559)
Changes in:
Components of working capital	(75,089)	(145,315)
Other noncurrent assets	13,489	(1,427)
Other noncurrent liabilities	16,844	9,534
Cash flows from (used in) operating activities	40,849	(68,817)
CASH FLOWS (USED IN) FROM INVESTING ACTIVITIES
Utility plant expenditures	(34,114)	(30,277)
Solar and wind equipment expenditures	(55,345)	(24,917)
Real estate properties and other expenditures	(11)	(205)
Cost of removal expenditures	(2,634)	(5,124)
Investments in equity investees	(547)	0
Distribution from equity investees in excess of equity in earnings	470	395
Proceeds from sale of asset	0	6,000
Withdrawal from restricted cash construction fund	(25)	85
Cash flows (used in) investing activities	(92,206)	(54,043)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common stock	24,373	3,557
Tax benefit from stock options exercised	816	0
Proceeds from sale-leaseback transaction	7,216	7,576
Proceeds from long-term debt	100,000	0
Payments of long-term debt	(1,723)us-gaap_RepaymentsOfLongTermDebt	(1,576)us-gaap_RepaymentsOfLongTermDebt
Purchases of treasury stock	(3,945)	0
Payments of common stock dividends	(18,993)us-gaap_PaymentsOfDividendsCommonStock	(17,617)us-gaap_PaymentsOfDividendsCommonStock
Net (payments) proceeds from short-term debt	(46,804)	138,000
Cash flows from financing activities	60,940	129,940
Change in cash and cash equivalents	9,583	7,080
Cash and cash equivalents at beginning of period	2,151	2,969
Cash and cash equivalents at end of period	11,734	10,049
CHANGES IN COMPONENTS OF WORKING CAPITAL
Receivables	(166,229)	(180,484)
Inventories	8,385us-gaap_IncreaseDecreaseInInventories	32,278us-gaap_IncreaseDecreaseInInventories
Recovery of gas costs	2,015	5,513
Gas purchases payable	65,563	13,673
Gas purchases payable - related parties	184	130
Prepaid and accrued taxes	14,108	32,449
Accounts payable and other	(53,852)	(10,052)
Restricted broker margin accounts	46,550	(46,745)
Customers' credit balances and deposits	14,345	3,988
Other current assets	(6,158)	3,935
Components of working capital	(75,089)	(145,315)
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION
Cash paid for Interest (net of amounts capitalized)	1,376us-gaap_InterestPaidNet	1,704us-gaap_InterestPaidNet
Cash paid for Income taxes	2,228us-gaap_IncomeTaxesPaid	137us-gaap_IncomeTaxesPaid
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING ACTIVITIES
Accrued capital expenditures	$ 12,107	$ 1,421

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