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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Accounts Receivable Allowances [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | $ 36,121 | $ 21,211 | $ 28,726
Charged to costs and expenses | 18,465 | 22,260 | 6,134
Charged to other accounts | (3,523) | 2,406 | 1,226
Deductions | (27,644) | (9,756) | (14,875)
Ending Balance | 23,419 | 36,121 | 21,211
Valuation Allowances on Net Deferred Tax Assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | 85,533 | 112,727 | 94,573
Charged to costs and expenses | 8,521 | 1,009 | 18,173
Charged to other accounts | 1,005 | 6,008 | 6,121
Deductions | (25,604) | (34,211) | (6,140)
Ending Balance | $ 69,455 | $ 85,533 | $ 112,727

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