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Composition of Certain Financial Statement Captions - Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Property and equipment $ 177,193 $ 156,154
Less: accumulated depreciation and amortization (124,293) (107,317)
Total $ 52,900 $ 48,837