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Composition of Certain Financial Statement Captions - Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Property and equipment	$ 154,749	$ 161,119
Less: accumulated depreciation and amortization	(119,852)	(114,700)
Property, Plant, and Equipment, Total	34,897	46,419
Long-term receivables	45,994	54,074
Prepaid commissions	40,598	38,579
Others	11,975	12,632
Other assets	$ 98,567	$ 105,285

X

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent.

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Amount of noncurrent assets classified as other.

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Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

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