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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income $ 106,272 $ 176,763
Adjustments to reconcile net income to cash flows from operating activities    
Unrealized loss (gain) on derivative instruments 57,910 (19,010)
Depreciation and amortization 52,897 45,164
Allowance for equity used during construction (3,959) (3,371)
Allowance for bad debt expense 1,170 2,143
Deferred income taxes 21,655 36,764
Manufactured gas plant remediation costs (5,070) (4,745)
Equity in earnings of equity investees, net of distributions received 3,420 3,909
Cost of removal - asset retirement obligations (99) (467)
Contributions to postemployment benefit plans (32,325) (2,466)
Tax benefit from stock-based compensation 1,701 838
Changes in:    
Components of working capital (93,014) 88,290
Other noncurrent assets (23,615) 22,572
Other noncurrent liabilities 9,656 36,350
Cash flows from operating activities 96,599 382,734
CASH FLOWS (USED IN) INVESTING ACTIVITIES    
Utility plant expenditures (111,751) (96,626)
Solar and wind equipment expenditures (115,736) (111,588)
Real estate properties and other expenditures (1,466) (90)
Cost of removal expenditures (21,342) (19,114)
Investments in equity investees (8,689) (2,313)
Distribution from equity investees in excess of equity in earnings 1,915 2,269
Withdrawal from (payment to) restricted cash construction fund 989 (1,484)
Proceeds from sale of property 748 0
Cash flows (used in) investing activities (255,332) (228,946)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES    
Net proceeds from (payments of) short-term debt 178,275 (301,000)
Proceeds from long-term debt 125,000 250,000
Payments of long-term debt (7,800) (7,227)
Proceeds from sale-leaseback transaction 7,107 7,216
Payments of common stock dividends (61,775) (57,226)
Proceeds from issuance of common stock 12,173 33,659
Purchases of treasury stock (1,008) (9,045)
Tax withholding payments related to net settled stock compensation (3,359) (2,136)
Cash flows from (used in) financing activities 248,613 (85,759)
Change in cash and cash equivalents 89,880 68,029
Cash and cash equivalents at beginning of period 4,928 2,151
Cash and cash equivalents at end of period 94,808 70,180
CHANGES IN COMPONENTS OF WORKING CAPITAL    
Receivables 9,846 (8,566)
Inventories 1,569 160,809
Recovery of gas costs (9,377) 18,109
Gas purchases payable (27,663) (47,371)
Gas purchases payable - related parties (410) 50
Prepaid and accrued taxes (1,422) (5,063)
Accounts payable and other (23,961) (26,829)
Restricted broker margin accounts (48,715) 3,466
Customers' credit balances and deposits 2,534 (5,784)
Other current assets 4,585 (531)
Components of working capital (93,014) 88,290
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION    
Cash paid for Interest (net of amounts capitalized) 21,492 14,324
Cash paid for Income taxes 923 22,818
Accrued capital expenditures $ 22,105 $ 30,038