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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,917,190 | $ 2,569,801 | $ 9,005,373 | $ 7,890,569
Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 100.00% | 100.00% | 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% | 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% | 100.00% | 100.00%
Prime Contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,775,505 | $ 2,447,401 | $ 8,584,534 | $ 7,502,044
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% | 95.00% | 95.00%
Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 141,685 | $ 122,400 | $ 420,839 | $ 388,525
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 5.00% | 5.00% | 5.00% | 5.00%
Defense Clients |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,454,686 | $ 1,225,697 | $ 4,415,664 | $ 3,718,335
Defense Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 50.00% | 48.00% | 49.00% | 47.00%
Intelligence Clients |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 451,187 | $ 405,885 | $ 1,408,646 | $ 1,326,342
Intelligence Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 15.00% | 16.00% | 16.00% | 17.00%
Civil Clients |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,011,317 | $ 938,219 | $ 3,181,063 | $ 2,845,892
Civil Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 35.00% | 36.00% | 35.00% | 36.00%
Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,673,838 | $ 1,403,297 | $ 5,114,805 | $ 4,317,430
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 57.00% | 55.00% | 57.00% | 55.00%
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 660,031 | $ 614,339 | $ 2,053,417 | $ 1,888,679
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% | 23.00% | 24.00%
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 583,321 | $ 552,165 | $ 1,837,151 | $ 1,684,460
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 20.00% | 21.00% | 20.00% | 21.00%

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