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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 141,970 $ 114,809 $ 92,879
Adjustments to reconcile net income to cash flows from operating activities      
Unrealized loss (gain) on derivative instruments 28,534 (9,417) 35,789
Depreciation and amortization 52,742 47,310 41,643
Impairment loss on investment 6,351 0 0
Allowance for equity used during construction (1,562) (2,037) (638)
Allowance for bad debt expense 2,504 2,627 3,932
Deferred income taxes 18,421 41,075 (5,323)
Manufactured gas plant remediation costs (4,396) (6,166) (7,965)
Equity in earnings of equity investees, net of distributions received 2,589 3,299 6,799
Cost of removal - asset retirement obligations (1,153) (1,697) (1,196)
Contributions to postemployment benefit plans (4,953) (26,028) (25,874)
Changes in:      
Components of working capital 85,480 (60,316) (95,357)
Other noncurrent assets 10,484 9,496 (20,539)
Other noncurrent liabilities 19,775 1,039 26,931
Cash flows from operating activities 356,786 113,994 51,081
CASH FLOWS (USED IN) INVESTING ACTIVITIES      
Expenditures for Utility plant (128,254) (110,482) (104,277)
Expenditures for Solar and wind equipment (135,543) (59,125) (89,726)
Expenditures for Real estate properties and other (1,179) (1,042) (1,334)
Expenditures for Cost of removal (24,312) (26,601) (12,178)
Investments in equity investees (555) 0 (8,800)
Distribution from equity investees in excess of equity in earnings 1,150 3,079 0
Withdrawal from restricted cash construction fund 88 56 (802)
Proceeds from sale of asset 6,010 0 0
Proceeds from sale of available for sale securities 0 482 0
Cash flows (used in) investing activities (282,595) (193,633) (217,117)
CASH FLOWS (USED IN) FROM FINANCING ACTIVITIES      
Proceeds from issuance of common stock 15,373 37,839 13,834
Tax benefit from stock options exercised 414 173 780
Proceeds from sale-leaseback transaction 7,576 7,076 6,522
Proceeds from long-term debt 125,000 50,000 100,000
Payments of long-term debt (82,586) (8,953) (8,025)
Purchases of treasury stock (5,522) (26,606) (8,768)
Payments of common stock dividends (70,664) (67,230) (61,688)
Net proceeds from short-term debt (64,600) 85,800 120,450
Cash flows (used in) from financing activities (75,009) 78,099 163,105
Change in cash and cash equivalents (818) (1,540) (2,931)
Cash and cash equivalents at beginning of period 2,969 4,509 7,440
Cash and cash equivalents at end of period 2,151 2,969 4,509
CHANGES IN COMPONENTS OF WORKING CAPITAL      
Receivables 48,032 (72,244) 36,670
Inventories 43,130 (55,755) 28,814
Recovery of gas costs 13,015 6,100 (11,686)
Gas purchases payable (47,528) 72,415 (70,216)
Gas purchases payable - related parties 14 (16) (61)
Prepaid and accrued taxes 21,133 (8,182) 23,036
Accounts payable and other 34,716 726 (3,418)
Restricted broker margin accounts (20,758) 15,348 666
Customers' credit balances and deposits (2,058) (24,059) (65,324)
Other current assets (4,216) 5,351 (33,838)
Components of working capital 85,480 (60,316) (95,357)
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION      
Cash paid for Interest (net of amounts capitalized) 22,458 20,414 16,670
Cash paid for Income taxes 22,447 12,039 10,053
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING ACTIVITIES      
Accrued capital expenditures $ 9,655 $ (7,103) $ 8,257