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Composition of Certain Financial Statement Captions - Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Property and equipment $ 153,879 $ 161,119
Less: accumulated depreciation and amortization (122,314) (114,700)
Total 31,565 46,419
Long-term receivables 41,492 54,074
Prepaid commissions 39,082 38,579
Other 12,911 12,632
Other assets $ 93,485 $ 105,285