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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, accumulated other comprehensive loss $ (10,163)  
Balance, accumulated other comprehensive loss (10,825) $ (10,163)
Effect of Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, accumulated other comprehensive loss (3,214) (2,807)
Change in period (1,132) (407)
Tax effect of change in period 0 0
Balance, accumulated other comprehensive loss (4,346) (3,214)
Minimum Pension Liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, accumulated other comprehensive loss (6,949) (9,124)
Change in period 475 1,944
Tax effect of change in period (5) 231
Balance, accumulated other comprehensive loss (6,479) (6,949)
Accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, accumulated other comprehensive loss (10,163) (11,931)
Change in period (657) 1,537
Tax effect of change in period (5) 231
Balance, accumulated other comprehensive loss $ (10,825) $ (10,163)