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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss $ 33,676 $ 30,425 $ 31,247 $ 34,335
Foreign currency translation adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss 0 (5,554)    
Retirement plan liability adjustment, net of tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss 186 163    
Interest rate swap agreement, net of tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss 0 2    
Total accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss $ 186 $ (5,389) $ (6,364) $ (6,660)