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Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 8,375 $ 7,755 $ 4,779
Charged to Costs & Expenses 8,042 9,761 5,411
Other Changes Add (Deduct) [1] (9,983) (9,141) (2,435)
Balance at End of Year $ 6,434 $ 8,375 $ 7,755
[1] Bad debts written off (net of recoveries).