CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS (USED IN) OPERATING ACTIVITIES
Net income	$ 34,929	$ 50,282
Adjustments to reconcile net income to cash flows from operating activities
Unrealized loss (gain) on derivative instruments	28,302	(1,135)
Depreciation and amortization	19,260	16,482
Allowance for equity used during construction	(584)	(1,215)
Allowance for bad debt expense	230	334
Deferred income taxes	16,262	46,166
Manufactured gas plant remediation costs	(1,619)	(1,520)
Distributions received from equity investees, net of equity in earnings	1,101	1,139
Cost of removal - asset retirement obligations	(198)	(33)
Contributions to postemployment benefit plans	(1,712)	(30,144)
Tax benefit from stock-based compensation	1,188	1,635
Changes in:
Components of working capital	(150,480)	(102,068)
Other noncurrent assets	7,242	(20,270)
Other noncurrent liabilities	15	4,173
Cash flows (used in) operating activities	(46,064)	(36,174)
CASH FLOWS (USED IN) INVESTING ACTIVITIES
Utility plant	(31,396)	(42,465)
Solar and wind equipment	(46,785)	(45,006)
Real estate properties and other	(171)	(797)
Cost of removal	(7,459)	(6,575)
Investments in equity investees	(4,636)	(2,846)
Distribution from equity investees in excess of equity in earnings	688	555
Withdrawal from restricted cash construction fund	0	1,001
Proceeds from sale of investment	3,218	0
Proceeds from sale of property	0	748
Cash flows (used in) investing activities	(86,541)	(95,385)
CASH FLOWS FROM FROM FINANCING ACTIVITIES
Net proceeds from short-term debt	162,900	144,650
Payments of long-term debt	(2,716)	(2,676)
Proceeds from sale-leaseback transaction	9,587	7,107
Payments of common stock dividends	(21,931)	(20,524)
Proceeds from issuance of common stock	4,616	3,807
Purchases of treasury stock	(6,355)	(1,008)
Tax withholding payments related to net settled stock compensation	(4,167)	(3,042)
Cash flows from financing activities	141,934	128,314
Change in cash and cash equivalents	9,329	(3,245)
Cash and cash equivalents at beginning of period	37,546	4,928
Cash and cash equivalents at end of period	46,875	1,683
CHANGES IN COMPONENTS OF WORKING CAPITAL
Receivables	(152,180)	(27,784)
Inventories	(13,954)	(26,772)
Recovery of gas costs	(2,472)	(11,882)
Gas purchases payable	47,767	(7,071)
Gas purchases payable - related parties	5	(406)
Prepaid and accrued taxes	7,954	(27,794)
Accounts payable and other	(12,405)	(22,489)
Restricted broker margin accounts	(26,173)	6,855
Customers' credit balances and deposits	616	10,056
Other current assets	362	5,219
Components of working capital	(150,480)	(102,068)
Cash paid (received) for:
Interest (net of amounts capitalized)	8,153	5,403
Income taxes	(7,020)	202
Accrued capital expenditures	$ 28,442	$ 21,721

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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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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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Amount of increase (decrease) in obligations classified as other, payable within one year or the normal operating cycle, if longer.

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