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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 132,065,000 $ 131,672,000 $ 180,960,000
Adjustments to reconcile net income to cash flows from operating activities      
Unrealized (gain) loss on derivative instruments (11,241,000) 46,883,000 (38,681,000)
Gain on sale of property and available for sale securities, net (7,287,000) 0 0
Depreciation and amortization 81,841,000 72,748,000 61,399,000
Allowance for equity used during construction (3,867,000) (4,375,000) (3,825,000)
Allowance for bad debt expense 2,023,000 1,616,000 2,859,000
Deferred income taxes 41,442,000 27,721,000 45,934,000
Manufactured gas plant remediation costs (10,934,000) (8,106,000) (6,805,000)
Distributions received from equity investees, net of equity in earnings (462,000) 4,534,000 6,663,000
Cost of removal - asset retirement obligations (484,000) (403,000) (1,034,000)
Contributions to postemployment benefit plans (6,077,000) (33,359,000) (5,778,000)
Tax benefit of delivered shares from stock based compensation 1,285,000 1,755,000 881,000
Changes in:      
Components of working capital 17,081,000 (123,325,000) 81,817,000
Other noncurrent assets 14,740,000 3,933,000 38,716,000
Other noncurrent liabilities (2,079,000) 21,336,000 27,841,000
Cash flows from operating activities 248,046,000 142,630,000 390,947,000
Expenditures for:      
Utility plant (144,106,000) (176,067,000) (140,797,000)
Solar and wind equipment (149,400,000) (149,063,000) (151,002,000)
Real estate properties and other (2,434,000) (1,896,000) (209,000)
Cost of removal (32,143,000) (29,066,000) (28,078,000)
Acquisition of retail and wholesale energy contracts (55,661,000) 0 0
Investments in equity investees (27,070,000) (11,176,000) (5,780,000)
Distributions from equity investees in excess of equity in earnings 2,749,000 2,351,000 2,620,000
Withdrawal from (payment to) restricted cash construction fund 1,322,000 979,000 (1,499,000)
Proceeds from sale of investment 0 0 3,016,000
Proceeds from sale of property 9,443,000 748,000 0
Proceeds from sale of available for sale securities 6,639,000 0 0
Cash flows (used in) investing activities (390,661,000) (363,190,000) (321,729,000)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES      
Proceeds from long-term debt 100,000,000 275,000,000 250,000,000
Payments of long-term debt (97,854,000) (13,289,000) (37,039,000)
Net proceeds from (payments of) short-term debt 144,300,000 55,350,000 (234,650,000)
Proceeds from sale-leaseback transaction - solar 32,901,000 0 0
Proceeds from sale-leaseback transaction - other 9,587,000 7,107,000 7,216,000
Payments of common stock dividends (87,988,000) (82,445,000) (76,532,000)
Proceeds from issuance of common stock 17,492,000 16,010,000 37,299,000
Purchases of treasury stock (6,355,000) (1,008,000) (10,589,000)
Tax withholding payments related to net settled stock compensation (4,788,000) (3,547,000) (2,146,000)
Cash flows from (used in) financing activities 107,295,000 253,178,000 (66,441,000)
Change in cash and cash equivalents (35,320,000) 32,618,000 2,777,000
Cash and cash equivalents at beginning of period 37,546,000 4,928,000 2,151,000
Cash and cash equivalents at end of period 2,226,000 37,546,000 4,928,000
CHANGES IN COMPONENTS OF WORKING CAPITAL      
Receivables (56,974,000) 11,303,000 32,529,000
Inventories 3,022,000 (45,986,000) 114,638,000
Recovery of gas costs (90,000) (39,642,000) 18,979,000
Gas purchases payable 20,663,000 (11,963,000) (54,525,000)
Gas purchases payable - related parties 2,000 (411,000) 202,000
Prepaid and accrued taxes 10,366,000 2,385,000 (18,161,000)
Accounts payable and other 13,086,000 (15,656,000) (14,714,000)
Restricted broker margin accounts 22,570,000 (38,752,000) 18,452,000
Customers’ credit balances and deposits (5,877,000) 12,044,000 (1,545,000)
Other current assets 10,313,000 3,353,000 (14,038,000)
Components of working capital 17,081,000 (123,325,000) 81,817,000
Cash paid (received) for:      
Interest (net of amounts capitalized) 44,362,000 31,996,000 24,208,000
Income taxes (6,877,000) (3,516,000) 28,790,000
Accrued capital expenditures 21,769,000 48,881,000 28,676,000
Deferred gain on non-cash exchange of investments $ 0 $ 0 $ 24,601,000