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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss $ 29,826 $ 29,656 $ 34,335 $ 36,063 $ 36,439 $ 40,690
Total accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss (6,423) $ (6,449) (6,660) $ (7,951) $ (8,124) $ (8,693)
Foreign currency translation loss, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss (5,875)   (5,927)      
Retirement plan liability adjustment, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss (552)   (742)      
Interest rate swap agreement, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive loss $ 4   $ 9