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FINANCIAL DERIVATIVE INSTRUMENTS - Summary of Gain or Loss Recognized in AOCI (Details) - Commodity swap contracts - Cash Flow Hedging - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion, net of tax) $ (5,995)   $ (2,112)
Amount of Gain (Loss) Reclassified from AOCI into Earnings $ (1,785) $ (168)