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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 10,661,896 | $ 9,258,911 | $ 8,363,700
Revenue (as a percent) | 100.00% | 100.00% | 100.00%
Prime Contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 10,143,192 | $ 8,755,628 | $ 7,864,273
Revenue (as a percent) | 95.00% | 95.00% | 94.00%
Sub-contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 518,704 | $ 503,283 | $ 499,427
Revenue (as a percent) | 5.00% | 5.00% | 6.00%
Global Commercial Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 173,247 | $ 231,642 | $ 216,276
Revenue (as a percent) | 2.00% | 3.00% | 3.00%
Total U.S. government |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 10,488,649 | $ 9,027,269 | $ 8,147,424
Revenue (as a percent) | 98.00% | 97.00% | 97.00%
Total U.S. government | Defense Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 5,055,779 | $ 4,228,110 | $ 3,965,590
Revenue (as a percent) | 47.00% | 45.00% | 47.00%
Total U.S. government | Intelligence Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,774,405 | $ 1,686,622 | $ 1,573,216
Revenue (as a percent) | 17.00% | 18.00% | 19.00%
Total U.S. government | Civil Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 3,658,465 | $ 3,112,537 | $ 2,608,618
Revenue (as a percent) | 34.00% | 34.00% | 31.00%
Cost-reimbursable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 5,873,045 | $ 4,908,451 | $ 4,514,262
Revenue (as a percent) | 55.00% | 53.00% | 54.00%
Time-and-materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,530,366 | $ 2,296,965 | $ 2,017,094
Revenue (as a percent) | 24.00% | 25.00% | 24.00%
Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,258,485 | $ 2,053,495 | $ 1,832,344
Revenue (as a percent) | 21.00% | 22.00% | 22.00%

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