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Other Balance Sheet Items - Details of Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for credit losses | $ (11,829) | $ (3,719)
Accounts receivable, net | 916,004 | 826,873
Billed and billable receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed and billable receivables | 776,877 | 692,707
Unbilled receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed and billable receivables | $ 150,956 | $ 137,885

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