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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]      
Net Income (Loss) $ 35,223 $ 31,945 $ 35,288
Other comprehensive income (loss):      
Unrealized gain (loss) on pension plan obligation 1,291 1,463 (436)
Tax effect of unrealized gain (loss) on pension plan obligation (262) (405) 129
Unrealized gain (loss) on captive insurance collateral 1,849 1,671 (4,952)
Tax effect of unrealized gain (loss) on captive insurance collateral (390) (352) 1,043
Unrealized gain (loss) on interest rate hedge (1,928) (399) 3,607
Tax effect of unrealized gain (loss) on interest rate hedge 512 105 (959)
Total other comprehensive income (loss) 1,072 2,083 (1,568)
Total comprehensive income $ 36,295 $ 34,028 $ 33,720