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Composition of Certain Financial Statement Captions - Property and Equipment (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
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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

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