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Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Oct. 04, 2021
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,051,294 | $ 1,051,294 |  | $ 1,070,442 |
GCA Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | 228,877 | 228,877 | $ 228,877 |  |
Investment securities | 515 | 515 | 515 |  |
Accounts receivable | 54,804 | 54,804 | 54,804 |  |
Unbilled work in progress | 4,672 | 4,672 | 4,672 |  |
Income taxes receivable | 0 | 0 | 1,771 |  |
Measurement period adjustments, income taxes receivable | (1,771) |  |  |  |
Deferred income taxes | 1,876 | 1,876 | 0 |  |
Measurement period adjustments, deferred tax assets | 1,876 |  |  |  |
Property and equipment | 8,727 | 8,727 | 8,727 |  |
Operating lease right-of-use assets | 27,383 | 27,383 | 27,383 |  |
Other assets | 20,506 | 20,506 | 20,506 |  |
Total intangible assets acquired | 74,300 | 74,300 | 74,300 |  |
Total assets | 421,660 | 421,660 | 421,555 |  |
Measurement period adjustments, total assets | 105 |  |  |  |
Accrued salaries and bonuses | 152,409 | 152,409 | 152,409 |  |
Accounts payable and accrued expenses | 22,722 | 22,722 | 22,722 |  |
Payable to affiliates | 15 | 15 | 15 |  |
Deferred income | 78 | 78 | 78 |  |
Deferred income taxes | 0 | 0 | 3,552 |  |
Measurement period adjustments, deferred income taxes | (3,552) |  |  |  |
Income taxes payable | 2,697 | 2,697 | 0 |  |
Measurement period adjustments, income taxes payable | 2,697 |  |  |  |
Operating lease liabilities | 27,527 | 27,527 | 27,527 |  |
Other liabilities | 19,897 | 19,897 | 19,897 |  |
Total liabilities | 225,345 | 225,345 | 226,200 |  |
Measurement period adjustments, liabilities | (855) |  |  |  |
Net identifiable assets acquired | 196,315 | 196,315 | 195,355 |  |
Measurement period adjustments, net identifiable assets acquired | 960 |  |  |  |
Goodwill | 393,254 | 393,254 | 394,214 |  | $ 393,300
Measurement period adjustments, goodwill | (960) |  |  |  |
Total GCA equity value | 589,569 | $ 589,569 | 589,569 |  |
Weighted-Average Amortization Period |  | 1 year 3 months 18 days |  |  |
GCA Corporation | Backlog |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total intangible assets acquired | 42,000 | $ 42,000 | 42,000 |  |
Weighted-Average Amortization Period |  | 1 year 2 months 12 days |  |  |
GCA Corporation | Trade name |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total intangible assets acquired | 17,100 | $ 17,100 | 17,100 |  |
Weighted-Average Amortization Period |  | 2 years |  |  |
GCA Corporation | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total intangible assets acquired | $ 15,200 | $ 15,200 | $ 15,200 |  |
Weighted-Average Amortization Period |  | 1 year |  |  |

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