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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
CASH FLOWS (USED IN) FROM OPERATING ACTIVITIES    
Net income $ 48,647 $ 123,320
Adjustments to reconcile net income to cash flows from operating activities    
Unrealized (gain) on derivative instruments (1,135) (88,673)
Depreciation and amortization 16,482 14,386
Allowance for equity used during construction (1,215) (1,253)
Allowance for bad debt expense 334 964
Deferred income taxes 46,166 35,897
Manufactured gas plant remediation costs (1,520) (1,008)
Equity in earnings of equity investees, net of distributions received 1,139 2,146
Cost of removal - asset retirement obligations (33) (105)
Contributions to postemployment benefit plans (30,144) (69)
Changes in:    
Components of working capital (102,068) (75,089)
Other noncurrent assets (20,270) 13,489
Other noncurrent liabilities 4,401 16,844
Cash flows (used in) from operating activities (39,216) 40,849
CASH FLOWS (USED IN) INVESTING ACTIVITIES    
Utility plant expenditures (42,465) (34,114)
Solar and wind equipment expenditures (45,006) (55,345)
Real estate properties and other expenditures (797) (11)
Cost of removal expenditures (6,575) (2,634)
Investments in equity investees (2,846) (547)
Other 2,304 445
Cash flows (used in) investing activities (95,385) (92,206)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from issuance of common stock 3,807 24,373
Tax benefit from stock options exercised 0 816
Proceeds from sale-leaseback transaction 7,107 7,216
Proceeds from long-term debt 0 100,000
Payments of long-term debt (2,676) (1,723)
Purchases of treasury stock (1,008) (3,945)
Payments of common stock dividends (20,524) (18,993)
Net proceeds from (payments of) short-term debt 144,650 (46,804)
Cash flows from financing activities 131,356 60,940
Change in cash and cash equivalents (3,245) 9,583
Cash and cash equivalents at beginning of period 4,928 2,151
Cash and cash equivalents at end of period 1,683 11,734
CHANGES IN COMPONENTS OF WORKING CAPITAL    
Receivables (27,784) (166,229)
Inventories (26,772) 8,385
Recovery of gas costs (11,882) 2,015
Gas purchases payable (7,071) 65,563
Gas purchases payable - related parties (406) 184
Prepaid and accrued taxes (27,794) 14,108
Accounts payable and other (22,489) (53,852)
Restricted broker margin accounts 6,855 46,550
Customers' credit balances and deposits 10,056 14,345
Other current assets 5,219 (6,158)
Components of working capital (102,068) (75,089)
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION    
Cash paid for Interest (net of amounts capitalized) 5,403 1,376
Cash paid for Income taxes 202 2,228
Accrued capital expenditures $ 21,721 $ 12,107