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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting [Abstract] |  |  |  |
Net financial earnings | $ 77,880 | $ 99,143 | $ 127,512 | $ 154,253
Less: |  |  |  |
Unrealized loss (gain) on derivative instruments and related transactions | 3,170 | 68,474 | 2,035 | (20,198)
Effects of economic hedging related to natural gas inventory | (1,054) | (23,450) | 2,759 | (32,215)
Tax adjustments | 2,436 | (6,784) | 743 | 22,443
NET INCOME | $ 73,328 | $ 60,903 | $ 121,975 | $ 184,223

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