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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss $ 49,891 $ 50,131
Foreign currency translation adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss (4,311) (4,607)
Retirement plan liability adjustment, net of tax    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss (4,486) (4,648)
Interest rate swap agreement adjustment, net of tax    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss 24 4
Total accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss $ (8,773) $ (9,251)