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BUSINESS SEGMENT AND OTHER OPERATIONS DATA, NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated net financial earnings |  |  |  |  |  |  |  |  | $ 138,085 | $ 151,503 | $ 176,857
Less: |  |  |  |  |  |  |  |  |  |  |
Unrealized loss (gain) on derivative instruments and related transactions |  |  |  |  |  |  |  |  | 46,883 | (38,681) | 28,534
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Tax |  |  |  |  |  |  |  |  | (17,018) | 14,391 | (10,492)
Effects of economic hedging related to natural gas inventory |  |  |  |  |  |  |  |  | (36,816) | (8,225) | 26,639
Tax effect |  |  |  |  |  |  |  |  | 13,364 | 3,058 | (9,794)
Net income, as reported | $ 25,400 | $ (17,363) | $ 73,354 | $ 50,281 | $ 4,197 | $ (7,460) | $ 60,903 | $ 123,320 | $ 131,672 | $ 180,960 | $ 141,970

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