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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accounts Receivable Allowances [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 23,419 $ 36,121 $ 21,211
Charged to costs and expenses 10,345 18,465 22,260
Charged to other accounts 156 (3,523) 2,406
Deductions (13,855) (27,644) (9,756)
Ending Balance 20,065 23,419 36,121
Valuation Allowances on Net Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 69,455 85,533 112,727
Charged to costs and expenses 6,382 8,521 1,009
Charged to other accounts 3,720 1,005 6,008
Deductions (14,007) (25,604) (34,211)
Ending Balance $ 65,550 $ 69,455 $ 85,533