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Other Balance Sheet Items - Details of Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
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Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] |  |
Billed and billable receivables | $ 683,180 | $ 723,979
Unbilled receivables | 120,097 | 91,404
Allowance for credit losses | (4,768) | (8,273)
Accounts receivable, net | $ 798,509 | $ 807,110

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