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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Loss    
Cumulative effect of foreign currency translation $ (4,313) $ (4,696)
Cumulative unrealized loss on pension liability (7,299) (7,299)
Accumulated other comprehensive loss $ (11,612) $ (11,995)