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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Accounts Receivable Allowances [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | $ 20,065 | $ 23,419 | $ 36,121
Charged to costs and expenses | 8,263 | 10,345 | 18,465
Charged to other accounts | (424) | 156 | (3,523)
Deductions | (11,277) | (13,855) | (27,644)
Ending Balance | 16,627 | 20,065 | 23,419
Valuation Allowances on Net Deferred Tax Assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | 65,550 | 69,455 | 85,533
Charged to costs and expenses | 3,840 | 6,382 | 8,521
Charged to other accounts | 584 | 3,720 | 1,005
Deductions | (13,106) | (14,007) | (25,604)
Ending Balance | $ 56,868 | $ 65,550 | $ 69,455

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