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Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($) $ in Thousands | 12 Months Ended
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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).

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