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Composition of Certain Financial Statement Captions - Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Property and equipment $ 156,053 $ 161,119
Less: accumulated depreciation and amortization (117,042) (114,700)
Property, Plant, and Equipment, Total 39,011 46,419
Long-term receivables 50,566 54,074
Prepaid commissions 40,159 38,579
Others 11,727 12,632
Other assets $ 102,452 $ 105,285