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Summary of Significant Accounting Policies - Revenue Recognition and Concentrations of Credit Risk - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 USD ($) Customer | Sep. 30, 2024 USD ($) Customer
Concentration Risk [Line Items] |  |
One customer with more than 10 percent | Customer | 1 | 1
Allowance for doubtful accounts | $ | $ 26,169 | $ 32,638
Accounts Receivable [Member] | Customer [Member] | One customer [Member] |  |
Concentration Risk [Line Items] |  |
Aggregate account receivable of more than 10% of total accounts receivable | 21.00% | 25.00%
Accounts Receivable [Member] | Customer [Member] | Minimum [Member] | One customer [Member] |  |
Concentration Risk [Line Items] |  |
Aggregate account receivable of more than 10% of total accounts receivable | 10.00% | 10.00%

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