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Accumulated Other Comprehensive Loss (Detail) - Components of Accumulated Other Comprehensive Loss - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Equity [Abstract]    
Cumulative effect of foreign currency translation $ (4,344) $ (4,346)
Cumulative unrealized loss on pension liability (6,479) (6,479)
Accumulated other comprehensive loss $ (10,823) $ (10,825)