CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 168,588	$ 106,272
Adjustments to reconcile net income to cash flows from operating activities
Unrealized (gain) loss on derivative instruments	(42,534)	57,910
Gain on sale of property and available for sale securities, net	(7,287)	0
Depreciation and amortization	60,348	52,897
Allowance for equity used during construction	(2,738)	(3,959)
Allowance for bad debt expense	916	1,170
Deferred income taxes	48,024	21,655
Manufactured gas plant remediation costs	(6,923)	(5,070)
Distributions received from equity investees, net of equity in earnings	(334)	3,420
Cost of removal - asset retirement obligations	(363)	(99)
Contributions to postemployment benefit plans	(4,640)	(32,325)
Tax benefit from stock-based compensation	1,284	1,701
Changes in:
Components of working capital	(26,843)	(93,014)
Other noncurrent assets	27,930	(23,615)
Other noncurrent liabilities	7,668	9,656
Cash flows from operating activities	223,096	96,599
CASH FLOWS (USED IN) INVESTING ACTIVITIES
Utility plant	(92,833)	(111,751)
Solar and wind equipment	(121,958)	(115,736)
Real estate properties and other	(933)	(1,466)
Cost of removal	(23,001)	(21,342)
Investments in equity investees	(24,097)	(8,689)
Distribution from equity investees in excess of equity in earnings	2,179	1,915
Withdrawal from restricted cash construction fund	1,302	989
Proceeds from sale of property, net of closing costs	9,443	748
Proceeds from sale of available for sale securities	6,639	0
Cash flows (used in) investing activities	(243,259)	(255,332)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from short-term debt	141,700	178,275
Proceeds from long-term debt	0	125,000
Payments of long-term debt	(43,454)	(7,800)
Proceeds from sale-leaseback transaction	9,587	7,107
Payments of common stock dividends	(65,909)	(61,775)
Proceeds from issuance of common stock	13,802	12,173
Purchases of treasury stock	(6,355)	(1,008)
Tax withholding payments related to net settled stock compensation	(4,595)	(3,359)
Cash flows from financing activities	44,776	248,613
Change in cash and cash equivalents	24,613	89,880
Cash and cash equivalents at beginning of period	37,546	4,928
Cash and cash equivalents at end of period	62,159	94,808
CHANGES IN COMPONENTS OF WORKING CAPITAL
Receivables	(26,487)	9,846
Inventories	4,003	1,569
Recovery of gas costs	(4,610)	(9,377)
Gas purchases payable	11,931	(27,663)
Gas purchases payable - related parties	(2)	(410)
Prepaid and accrued taxes	(22,820)	(1,422)
Accounts payable and other	(3,973)	(23,961)
Restricted broker margin accounts	27,314	(48,715)
Customers' credit balances and deposits	(12,873)	2,534
Other current assets	674	4,585
Components of working capital	(26,843)	(93,014)
Cash paid (received) for:
Interest (net of amounts capitalized)	30,128	21,492
Income taxes	(4,178)	923
Accrued capital expenditures	$ 32,826	$ 22,105

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

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Cash outflow related to disposal costs of plants, whether by demolishing, dismantling, abandoning, sale, and so forth during the period.

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No definition available.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of cash outflow to acquire investments classified as other.

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Amount of cash outflow for the purchase of or improvements to tangible or intangible assets, used to produce goods or deliver services, classified as other.

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Amount of cash outflow from the acquisition of or improvements to long-lived, physical assets used to produce goods and services and not intended for resale, classified as other.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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No definition available.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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