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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
CASH FLOWS USED IN OPERATING ACTIVITIES    
Net (loss) income $ 86,248 $ 123,699
Adjustments to reconcile net income to cash flows from operating activities    
Unrealized (gain) loss on derivative instruments (10,932) 34,855
Realized and unrealized gain on investments in equity securities (257) (5,332)
Depreciation and amortization 21,832 21,854
Amortization of acquired wholesale energy contracts 370 3,391
Allowance for equity used during construction (1,751) (852)
Allowance for doubtful accounts 643 471
Deferred income taxes (8,733) 13,451
Deferred income tax benefit due to the Tax Act 0 (57,565)
Manufactured gas plant remediation costs (2,593) (5,147)
Equity in earnings, net of distributions received from equity investees (830) (257)
Cost of removal - asset retirement obligations (65) (332)
Contributions to postemployment benefit plans (1,666) (1,467)
Tax benefit from stock-based compensation 1,279 2,831
Changes in:    
Components of working capital (206,728) (189,528)
Other noncurrent assets 9,710 31,038
Other noncurrent liabilities 8,718 5,388
Cash flows used in operating activities (104,755) (23,502)
Expenditures for:    
Utility plant (51,359) (34,638)
Solar equipment (32,126) (18,387)
Midstream and other (2,420) (1,313)
Cost of removal (8,396) (12,752)
Distribution from equity investees in excess of equity in earnings 619 793
Investments in equity investees 0 (7,202)
Cash paid related to acquisition 0 (10,000)
Proceeds from sale of investments in equity securities, net 0 6,616
Cash flows used in investing activities (93,682) (76,883)
CASH FLOWS FROM FINANCING ACTIVITIES    
Payments of long-term debt (4,723) (1,690)
Proceeds from short-term debt, net 219,750 107,200
Proceeds from sale-leaseback transaction 9,895 7,820
Payments of common stock dividends (25,812) (23,607)
Proceeds from waiver discount issuance of common stock 7,964 22,690
Proceeds from issuance of common stock 3,749 3,846
Tax withholding payments related to net settled stock compensation (6,087) (13,319)
Cash flows from financing activities 204,736 102,940
Change in cash, cash equivalents and restricted cash 6,299 2,555
Cash, cash equivalents and restricted cash at beginning of period 1,710 2,469
Cash, cash equivalents and restricted cash at end of period 8,009 5,024
CHANGES IN COMPONENTS OF WORKING CAPITAL    
Receivables (161,039) (192,253)
Inventories (58,061) (2,561)
Recovery of gas costs (1,142) 17,102
Gas purchases payable 58,663 43,284
Prepaid and accrued taxes 17,027 (12,418)
Accounts payable and other (47,498) (25,527)
Restricted broker margin accounts (9,963) (21,694)
Customers' credit balances and deposits 2,304 6,093
Other current assets (7,019) (1,554)
Components of working capital (206,728) (189,528)
Cash paid (received) for:    
Interest (net of amounts capitalized) 16,002 9,758
Income taxes 130 (191)
Accrued capital expenditures $ 19,791 $ 26,034