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Composition of Certain Financial Statement Captions - Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Property and equipment $ 123,516 $ 124,966
Less: accumulated depreciation and amortization (98,919) (97,053)
Total 24,597 27,913
Long-term receivables 30,297 37,452
Prepaid commissions 45,998 44,932
Other 11,690 13,201
Other assets $ 87,985 $ 95,585