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Other Balance Sheet Items - Details of Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for credit losses | $ (4,663) | $ (4,791)
Accounts receivable, net | 962,650 | 879,514
Billed and billable receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | 672,288 | 734,817
Unbilled receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, gross | $ 295,025 | $ 149,488

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