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Schedule - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Accounts Receivable Allowances [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 16,627 $ 20,065 $ 23,419
Charged to costs and expenses 6,876 8,263 10,345
Charged to other accounts (937) (424) 156
Deductions (2,765) (11,277) (13,855)
Ending Balance 19,801 16,627 20,065
Valuation Allowances on Net Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 56,868 65,550 69,455
Charged to costs and expenses 7,144 3,840 6,382
Charged to other accounts 7,449 584 3,720
Deductions (5,296) (13,106) (14,007)
Ending Balance $ 66,165 $ 56,868 $ 65,550