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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Accounts Receivable Allowances [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | $ 16,627 | $ 20,065 | $ 23,419
Charged to costs and expenses | 6,876 | 8,263 | 10,345
Charged to other accounts | (937) | (424) | 156
Deductions | (2,765) | (11,277) | (13,855)
Ending Balance | 19,801 | 16,627 | 20,065
Valuation Allowances on Net Deferred Tax Assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | 56,868 | 65,550 | 69,455
Charged to costs and expenses | 7,144 | 3,840 | 6,382
Charged to other accounts | 7,449 | 584 | 3,720
Deductions | (5,296) | (13,106) | (14,007)
Ending Balance | $ 66,165 | $ 56,868 | $ 65,550

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