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Business Combinations - Schedule of Asset Acquired and Liabilities Assumed, VES (Details) - USD ($) $ in Thousands |  |  | 4 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | May 28, 2021 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2020
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |
Goodwill | $ 1,774,406 |  | $ 1,774,406 | $ 1,779,415 | $ 593,129
VES Group, Inc. |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |
Cash consideration, net of cash acquired | $ 1,370,631 | $ 1,364,866 |  |  |
Accounts receivable - billed, billable and unbilled |  | 44,078 |  | 44,078 |
Prepaid expenses and other current assets |  | 7,955 |  | 7,955 |
Property and equipment, net |  | 9,113 |  | 8,021 |
Operating lease right-of-use assets |  | 18,898 |  | 18,898 |
Intangible assets |  | 664,000 |  | 664,000 |
Other assets |  | 7,166 |  | 7,166 |
Total identifiable assets acquired |  | 751,210 |  | 750,118 |
Accounts payable and other liabilities |  | 42,182 |  | 43,986 |
Operating lease liabilities |  | 18,898 |  | 18,898 |
Income taxes payable, current |  | 5,673 |  | 5,673 |
Deferred income taxes |  | 171,497 |  | 171,023 |
Other long-term liabilities |  | 12,270 |  | 12,270 |
Total identifiable liabilities assumed |  | 250,520 |  | 251,850 |
Net identifiable assets acquired |  | 500,690 |  | 498,268 |
Goodwill |  | 864,176 |  | 872,363 |
Net assets acquired |  | $ 1,364,866 |  | $ 1,370,631 |
Adjustments |  |  |  |  |
Cash consideration, net of cash acquired |  |  | 5,765 |  |
Accounts receivable - billed, billable and unbilled |  |  | 0 |  |
Prepaid expenses and other current assets |  |  | 0 |  |
Property and equipment, net |  |  | (1,092) |  |
Operating lease right-of-use assets |  |  | 0 |  |
Intangible assets |  |  | 0 |  |
Other assets |  |  | 0 |  |
Total identifiable assets acquired |  |  | (1,092) |  |
Accounts payable and other liabilities |  |  | 1,804 |  |
Operating lease liabilities |  |  | 0 |  |
Income taxes payable, current |  |  | 0 |  |
Deferred income taxes |  |  | (474) |  |
Other long-term liabilities |  |  | 0 |  |
Total identifiable liabilities assumed |  |  | 1,330 |  |
Net identifiable assets acquired |  |  | (2,422) |  |
Goodwill |  |  | 8,187 |  |
Net assets acquired |  |  | $ 5,765 |  |

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