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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 68,374 $ 62,041 $ 81,353 $ 75,580
Other comprehensive income:        
Unrealized gain on pension plan obligation 319 382 638 762
Tax effect of unrealized gain on pension plan obligation (85) (104) (160) (201)
Unrealized gain on captive insurance collateral 263 775 1,195 1,130
Tax effect of unrealized gain on captive insurance collateral (50) (164) (252) (238)
Unrealized gain (loss) on interest rate hedges 221 (704) (821) (1,081)
Tax effect of unrealized gain (loss) on interest rate hedges (65) 186 220 288
Total other comprehensive income 603 371 820 660
Total comprehensive income $ 68,977 $ 62,412 $ 82,173 $ 76,240