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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,277,074 | $ 2,030,520 | $ 6,825,650 | $ 6,125,624
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 Type 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 | $ 2,151,265 | $ 1,913,657 | $ 6,461,935 | $ 5,753,596
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 94.00% | 94.00% | 95.00% | 94.00%
Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 125,809 | $ 116,863 | $ 363,715 | $ 372,028
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 6.00% | 6.00% | 5.00% | 6.00%
Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,221,235 | $ 1,966,536 | $ 6,643,256 | $ 5,967,127
Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 97.00% | 97.00% | 97.00% | 97.00%
Defense Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,043,535 | $ 946,141 | $ 3,082,634 | $ 2,916,210
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) | 46.00% | 47.00% | 45.00% | 48.00%
Intelligence Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 419,227 | $ 369,345 | $ 1,260,653 | $ 1,144,933
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) | 18.00% | 18.00% | 18.00% | 18.00%
Civil Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 758,473 | $ 651,050 | $ 2,299,969 | $ 1,905,984
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) | 33.00% | 32.00% | 34.00% | 31.00%
Global Commercial Clients |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 55,839 | $ 63,984 | $ 182,394 | $ 158,497
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 3.00% | 3.00% | 3.00% | 3.00%
Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,211,589 | $ 1,079,893 | $ 3,603,824 | $ 3,322,507
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 53.00% | 53.00% | 53.00% | 54.00%
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 572,491 | $ 484,718 | $ 1,682,831 | $ 1,482,431
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 25.00% | 24.00% | 25.00% | 24.00%
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 492,994 | $ 465,909 | $ 1,538,995 | $ 1,320,686
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 22.00% | 23.00% | 22.00% | 22.00%

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