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Accumulated Other Comprehensive Loss - Components (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 29,534 $ 30,428
Ending Balance 34,046 29,534
Accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (11,995) (12,593)
Change in period 2,618 565
Tax effect of change in period (71) 33
Ending Balance (9,448) (11,995)
Effect of Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (4,696) (5,111)
Change in period 646 415
Ending Balance (4,050) (4,696)
Minimum Pension Liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (7,299) (7,482)
Change in period 1,972 150
Tax effect of change in period (71) 33
Ending Balance $ (5,398) $ (7,299)