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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net (loss) income $ (111,831) $ (19,298) $ 119,023 $ 130,300
Other comprehensive income (loss), net of tax        
Reclassifications of losses to net income on derivatives designated as hedging instruments, net of tax of $(79), $0, $(270) and $0, respectively 264 0 758 0
Loss on derivatives designated as hedging instruments, net of tax of $0, $180, $0 and $2,961, respectively 0 (626) 0 (10,337)
Adjustment to postemployment benefit obligation, net of tax of $(245), $(191), $(734) and $(2,161), respectively 812 663 2,437 7,522
Other comprehensive income (loss) 1,076 37 3,195 (2,815)
Comprehensive (loss) income $ (110,755) $ (19,261) $ 122,218 $ 127,485