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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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