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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accounts Receivable Allowances [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 20,065 $ 23,419 $ 36,121
Charged to costs and expenses 8,263 10,345 18,465
Charged to other accounts (424) 156 (3,523)
Deductions (11,277) (13,855) (27,644)
Ending Balance 16,627 20,065 23,419
Valuation Allowances on Net Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 65,550 69,455 85,533
Charged to costs and expenses 3,840 6,382 8,521
Charged to other accounts 584 3,720 1,005
Deductions (13,106) (14,007) (25,604)
Ending Balance $ 56,868 $ 65,550 $ 69,455