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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 2,941,797 | $ 2,654,486
Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Revenue from Contract with Customer Benchmark | Contractor Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Prime Contractor |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 2,807,685 | $ 2,517,558
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 95.00% | 95.00%
Subcontractor |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 134,112 | $ 136,928
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 5.00% | 5.00%
Defense Clients |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,416,870 | $ 1,224,317
Defense Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 48.00% | 46.00%
Intelligence Clients |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 461,039 | $ 476,497
Intelligence Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 16.00% | 18.00%
Civil Clients |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,063,888 | $ 953,672
Civil Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 36.00% | 36.00%
Cost-reimbursable |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,659,923 | $ 1,450,184
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 56.00% | 55.00%
Time-and-materials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 670,568 | $ 635,733
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 23.00% | 24.00%
Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 611,306 | $ 568,569
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk (as a percent) | 21.00% | 21.00%

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