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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,666,282 | $ 2,298,976 | $ 5,320,768 | $ 4,548,576
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 | $ 2,537,085 | $ 2,179,375 | $ 5,054,643 | $ 4,310,670
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 | $ 129,197 | $ 119,601 | $ 266,125 | $ 237,906
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%
Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,631,186 | $ 2,235,428 | $ 5,236,960 | $ 4,422,022
Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 99.00% | 97.00% | 98.00% | 97.00%
Defense Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,270,135 | $ 1,028,275 | $ 2,494,452 | $ 2,056,086
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) | 48.00% | 45.00% | 47.00% | 45.00%
Intelligence Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 444,982 | $ 425,874 | $ 921,479 | $ 829,997
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) | 17.00% | 18.00% | 17.00% | 18.00%
Civil Clients | Total U.S. government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 916,069 | $ 781,279 | $ 1,821,029 | $ 1,535,939
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) | 34.00% | 34.00% | 34.00% | 34.00%
Global Commercial Clients |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 35,096 | $ 63,548 | $ 83,808 | $ 126,554
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 1.00% | 3.00% | 2.00% | 3.00%
Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,463,949 | $ 1,201,407 | $ 2,914,133 | $ 2,392,235
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 55.00% | 52.00% | 55.00% | 53.00%
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 638,607 | $ 564,438 | $ 1,274,340 | $ 1,110,340
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% | 24.00%
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 563,726 | $ 533,131 | $ 1,132,295 | $ 1,046,001
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk (as a percent) | 21.00% | 23.00% | 21.00% | 23.00%

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