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Organization and Basis of Presentation - Narrative (Details) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) segment | Oct. 01, 2019 USD ($) | Sep. 30, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Goodwill | $ 586,757 |  | $ 584,469
Number of operating segments | segment | 3 |  |
Billed, billable and unbilled accounts receivable | $ 829,700 |  |
Bad debt expense | 8,800 |  |
Total lease liabilities | $ 178,114 |  |
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Total lease liabilities |  | $ 214,500 |

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