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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 121,975 $ 184,223
Adjustments to reconcile net income to cash flows from operating activities    
Unrealized loss (gain) on derivative instruments 2,035 (20,198)
Depreciation and amortization 34,226 29,590
Allowance for equity used during construction (2,357) (2,014)
Allowance for bad debt expense 873 1,696
Deferred income taxes 17,980 31,576
Manufactured gas plant remediation costs (2,656) (2,089)
Equity in earnings of equity investees, net of distributions received 2,261 4,089
Cost of removal - asset retirement obligations (66) (403)
Contributions to postemployment benefit plans (32,167) (2,434)
Changes in:    
Components of working capital (13,788) 42,506
Other noncurrent assets (15,794) 39,396
Other noncurrent liabilities 2,302 20,568
Cash flows from operating activities 114,824 326,506
CASH FLOWS (USED IN) INVESTING ACTIVITIES    
Utility plant expenditures (76,326) (58,657)
Solar and wind equipment expenditures (70,882) (88,370)
Real estate properties and other expenditures (1,069) (61)
Cost of removal expenditures (20,080) (11,334)
Investments in equity investees (5,948) (1,264)
Distribution from equity investees in excess of equity in earnings 1,131 957
Withdrawal from (payment to) restricted cash construction fund 1,007 (1,484)
Proceeds from sale of property 748 0
Cash flows (used in) investing activities (171,419) (160,213)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES    
Proceeds from issuance of common stock 8,220 28,310
Tax benefit from stock options exercised 0 839
Proceeds from sale-leaseback transaction 7,107 7,216
Proceeds from long-term debt 0 100,000
Payments of long-term debt (5,807) (4,510)
Purchases of treasury stock (1,008) (3,945)
Payments of common stock dividends (41,115) (38,010)
Net proceeds from (payments of) short-term debt 86,150 (155,000)
Cash flows from (used in) financing activities 53,547 (65,100)
Change in cash and cash equivalents (3,048) 101,193
Cash and cash equivalents at beginning of period 4,928 2,151
Cash and cash equivalents at end of period 1,880 103,344
CHANGES IN COMPONENTS OF WORKING CAPITAL    
Receivables (16,750) (178,647)
Inventories 43,479 205,992
Recovery of gas costs (20,396) 15,734
Gas purchases payable (31,324) 24,827
Gas purchases payable - related parties (409) 155
Prepaid and accrued taxes 43,154 39,169
Accounts payable and other (25,026) (35,456)
Restricted broker margin accounts (12,478) (16,707)
Customers' credit balances and deposits 226 (5,821)
Other current assets 5,736 (6,740)
Components of working capital (13,788) 42,506
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION    
Cash paid for Interest (net of amounts capitalized) 15,647 12,946
Cash paid for Income taxes 688 14,719
Accrued capital expenditures $ 21,663 $ 26,781