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