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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,569,801 | $ 2,277,074 | $ 7,890,569 | $ 6,825,650
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 | $ 2,447,401 | $ 2,151,265 | $ 7,502,044 | $ 6,461,935
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 95.00% | 94.00% | 95.00% | 95.00%
Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 122,400 | $ 125,809 | $ 388,525 | $ 363,715
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 5.00% | 6.00% | 5.00% | 5.00%
Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,526,221 | $ 2,221,234 | $ 7,763,181 | $ 6,643,256
Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 98.00% | 97.00% | 98.00% | 97.00%
Defense Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,224,561 | $ 1,046,441 | $ 3,719,013 | $ 3,102,528
Defense Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 47.00% | 46.00% | 47.00% | 45.00%
Intelligence Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 408,458 | $ 418,783 | $ 1,329,937 | $ 1,248,779
Intelligence Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 16.00% | 18.00% | 17.00% | 18.00%
Civil Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 893,202 | $ 756,010 | $ 2,714,231 | $ 2,291,949
Civil Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 35.00% | 33.00% | 34.00% | 34.00%
Global Commercial Clients |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 43,580 | $ 55,840 | $ 127,388 | $ 182,394
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 2.00% | 3.00% | 2.00% | 3.00%
Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,403,297 | $ 1,211,589 | $ 4,317,430 | $ 3,603,824
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 55.00% | 53.00% | 55.00% | 53.00%
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 614,339 | $ 572,491 | $ 1,888,679 | $ 1,682,831
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 24.00% | 25.00% | 24.00% | 25.00%
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 552,165 | $ 492,994 | $ 1,684,460 | $ 1,538,995
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 21.00% | 22.00% | 21.00% | 22.00%

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