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Other Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for credit losses | $ (3,719) | $ (8,273) |
Accounts receivable, net | 826,873 | 807,110 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 8,273 | 8,044 | $ 6,051
Provision for estimated credit losses | 7,097 | 6,799 | 11,038
Write-offs, net of recoveries | (11,651) | (6,570) | (9,045)
Balance at end of period | 3,719 | 8,273 | $ 8,044
Billed and billable receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable Gross | 692,707 | 723,979 |
Unbilled receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable Gross | $ 137,885 | $ 91,404 |

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