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Accounts Receivable, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for credit losses | $ (8,044) | $ (6,051) |
Accounts receivable, net | 834,819 | 786,203 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 6,051 | 5,382 | $ 4,285
Provision for estimated credit losses | 11,038 | 12,976 | 4,018
Write-offs, net of recoveries | (9,045) | (12,307) | (2,921)
Balance at end of period | 8,044 | 6,051 | $ 5,382
Billed and billable receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable Gross | 718,728 | 628,922 |
Unbilled receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable Gross | $ 124,135 | $ 163,332 |

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