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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, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated net financial earnings |  |  |  |  |  |  |  |  | $ 240,486 | $ 149,392 | $ 138,085
Less: |  |  |  |  |  |  |  |  |  |  |
Unrealized loss (gain) on derivative instruments and related transactions |  |  |  |  |  |  |  |  | 26,770 | (11,241) | 46,883
Unrealized loss (gain) on derivative instruments and related transactions, tax effect |  |  |  |  |  |  |  |  | (4,512) | 4,062 | (17,018)
Effects of economic hedging related to natural gas inventory |  |  |  |  |  |  |  |  | (22,570) | 38,470 | (36,816)
Effects of economic hedging related to natural gas inventory, tax effect |  |  |  |  |  |  |  |  | 7,362 | (13,964) | 13,364
NET INCOME | $ (16,255) | $ (14,274) | $ 140,266 | $ 123,699 | $ (36,523) | $ 18,957 | $ 114,702 | $ 34,929 | $ 233,436 | $ 132,065 | $ 131,672

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