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REPORTING SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated net financial earnings |  |  |  |  |  |  |  |  | $ 196,245 | $ 174,960 | $ 240,486
Less: |  |  |  |  |  |  |  |  |  |  |
Unrealized (gain) loss on derivative instruments and related transactions |  |  |  |  |  |  |  |  | (9,644) | 2,881 | 26,770
Unrealized loss (gain) on derivative instruments and related transactions, tax effect |  |  |  |  |  |  |  |  | 2,296 | (711) | (4,512)
Effects of economic hedging related to natural gas inventory |  |  |  |  |  |  |  |  | 12,690 | 4,309 | (22,570)
Effects of economic hedging related to natural gas inventory, tax effect |  |  |  |  |  |  |  |  | (3,016) | (1,024) | 7,362
NET INCOME | $ 43,272 | $ (27,219) | $ 88,505 | $ 89,361 | $ 18,086 | $ (8,402) | $ 73,573 | $ 86,248 | $ 193,919 | $ 169,505 | $ 233,436

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