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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net Income (Loss) $ (23,906) $ (10,587) $ 51,674 $ 85,281
Other comprehensive income (loss):        
Unrealized gain on pension plan obligation 382 224 1,144 672
Tax effect of unrealized gain on pension plan obligation (104) (61) (305) (167)
Unrealized gain (loss) on captive insurance collateral (50) (812) 1,080 (3,486)
Tax effect of unrealized gain (loss) on captive insurance collateral 11 171 (227) 735
Unrealized gain (loss) on interest rate hedges 571 623 (510) 2,890
Tax effect of unrealized gain (loss) on interest rate hedges (151) (165) 137 (768)
Total other comprehensive income (loss) 659 (20) 1,319 (124)
Total comprehensive income (loss) $ (23,247) $ (10,607) $ 52,993 $ 85,157