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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 180,664 $ 105,675
Adjustments to reconcile net income to cash flows from operating activities:    
Unrealized loss on derivative instruments 52,394 20,466
Depreciation and amortization 25,394 23,024
Allowance for equity used during construction (603) (1,333)
Allowance for bad debt expense 1,205 1,341
Deferred income taxes 22,970 14,639
Manufactured gas plant remediation costs (1,845) (3,254)
Equity in earnings of equity investees, net of distributions received 1,626 1,835
Cost of removal - asset retirement obligations (164) (137)
Contributions to postemployment benefit plans (2,348) (23,102)
Changes in:    
Components of working capital 96,040 (44,510)
Other noncurrent assets 6,038 5,198
Other noncurrent liabilities 2,071 8,539
Cash flows from operating activities 383,442 108,381
CASH FLOWS (USED IN) INVESTING ACTIVITIES    
Utility plant expenditures (59,971) (51,376)
Solar and wind equipment expenditures (45,403) (24,865)
Real estate properties and other expenditures (477) (298)
Cost of removal expenditures (10,914) (14,323)
Distribution from equity investees in excess of equity in earnings 464 648
Proceeds from sale of asset 6,000 0
Withdrawal from restricted cash construction fund 85 0
Cash flows (used in) investing activities (110,216) (90,214)
CASH FLOWS (USED IN) FINANCING ACTIVITIES    
Proceeds from issuance of common stock 7,757 6,922
Tax benefit from stock options exercised 94 79
Proceeds from sale-leaseback transaction 7,576 7,076
Proceeds from long-term debt 125,000 0
Payments of long-term debt (65,017) (3,833)
Purchases of treasury stock (4,387) (1,311)
Payments of common stock dividends (35,264) (33,913)
Net (payments)/proceeds from short-term debt (302,400) 8,300
Cash flows (used in) financing activities (266,641) (16,680)
Change in cash and cash equivalents 6,585 1,487
Cash and cash equivalents at beginning of period 2,969 4,509
Cash and cash equivalents at end of period 9,554 5,996
CHANGES IN COMPONENTS OF WORKING CAPITAL    
Receivables (294,939) (245,241)
Inventories 178,955 92,822
Recovery of gas costs 6,866 (542)
Gas purchases payable 138,044 88,263
Prepaid and accrued taxes 67,164 46,900
Accounts payable and other 3,992 (5,070)
Restricted broker margin accounts (21,329) (10,196)
Customers' credit balances and deposits (8,819) (30,579)
Other current assets 26,106 19,133
Components of working capital 96,040 (44,510)
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION    
Cash paid for Interest (net of amounts capitalized) 11,221 10,207
Cash paid for Income taxes 8,648 4,111
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING ACTIVITIES    
Accrued capital expenditures $ 1,347 $ (9,463)