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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive income (loss) $ 32,367 $ 33,676 $ 30,425 $ 29,656 $ 31,247 $ 34,335
Foreign currency translation adjustment            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive income (loss) 0   (5,554)      
Retirement plan liability adjustment, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive income (loss) 208   163      
Interest rate swap agreement, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive income (loss) 0   2      
Total accumulated other comprehensive income (loss)            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total accumulated other comprehensive income (loss) $ 208 $ 186 $ (5,389) $ (6,449) $ (6,364) $ (6,660)