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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Accounts Receivable Allowances [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | $ 28,726 | $ 39,512 | $ 33,837
Charged to costs and expenses | 6,134 | 17,282 | 24,004
Charged to other accounts | 1,226 | 1,985 | 1,415
Deductions | (14,875) | (30,053) | (19,744)
Ending Balance | 21,211 | 28,726 | 39,512
Valuation Allowances on Net Deferred Tax Assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | 94,573 | 96,870 | 112,165
Charged to costs and expenses | 18,173 | 16,425 | 13,800
Charged to other accounts | 6,121 | 5,000 | 826
Deductions | (6,140) | (23,722) | (29,921)
Ending Balance | $ 112,727 | $ 94,573 | $ 96,870

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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