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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Accounts Receivable Allowances [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | $ 21,211 | $ 28,726 | $ 39,512
Charged to costs and expenses | 22,260 | 6,134 | 17,282
Charged to other accounts | 2,406 | 1,226 | 1,985
Deductions | (9,756) | (14,875) | (30,053)
Ending Balance | 36,121 | 21,211 | 28,726
Valuation Allowances on Net Deferred Tax Assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | 112,727 | 94,573 | 96,870
Charged to costs and expenses | 1,009 | 18,173 | 16,425
Charged to other accounts | 6,008 | 6,121 | 5,000
Deductions | (34,211) | (6,140) | (23,722)
Ending Balance | $ 85,533 | $ 112,727 | $ 94,573

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