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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting [Abstract] |  |  |  |
Consolidated net financial earnings | $ 2,477 | $ 4,514 | $ 156,729 | $ 196,295
Unrealized loss (gain) from derivative instruments and related transactions | 1,188 | (6,585) | (19,010) | 45,811
Effects of economic hedging related to natural gas inventory | 16,464 | 38,139 | (15,751) | (3,409)
Tax adjustments | (7,715) | (12,766) | 14,727 | (12,497)
NET (LOSS) INCOME | $ (7,460) | $ (14,274) | $ 176,763 | $ 166,390

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