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BUSINESS SEGMENT AND OTHER OPERATIONS DATA, NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting [Abstract]                      
Consolidated net financial earnings                 $ 176,857 $ 113,681 $ 112,417
Unrealized loss (gain) on derivative instruments and related transactions                 28,534 (9,418) 35,790
Effects of economic hedging related to natural gas inventory                 26,639 7,635 (4,891)
Tax adjustments                 (20,286) 655 (11,361)
NET INCOME $ (24,420) $ (14,274) $ 172,971 $ 7,693 $ (20,021) $ 29,155 $ 45,469 $ 60,206 $ 141,970 $ 114,809 $ 92,879