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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 9,258,911 | $ 8,363,700 | $ 7,858,938
Revenue (as a percent) | 100.00% | 100.00% | 100.00%
Prime Contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 8,755,628 | $ 7,864,273 | $ 7,311,313
Revenue (as a percent) | 95.00% | 94.00% | 93.00%
Sub-contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 503,283 | $ 499,427 | $ 547,625
Revenue (as a percent) | 5.00% | 6.00% | 7.00%
Global Commercial Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 229,650 | $ 216,280 | $ 205,834
Revenue (as a percent) | 3.00% | 3.00% | 3.00%
Total U.S. government |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 9,029,261 | $ 8,147,420 | $ 7,653,104
Revenue (as a percent) | 97.00% | 97.00% | 97.00%
Total U.S. government | Defense Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 4,210,430 | $ 3,950,751 | $ 3,920,498
Revenue (as a percent) | 45.00% | 47.00% | 49.00%
Total U.S. government | Intelligence Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,693,942 | $ 1,578,939 | $ 1,549,422
Revenue (as a percent) | 18.00% | 19.00% | 20.00%
Total U.S. government | Civil Clients |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 3,124,889 | $ 2,617,730 | $ 2,183,184
Revenue (as a percent) | 34.00% | 31.00% | 28.00%
Cost-reimbursable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 4,908,451 | $ 4,514,262 | $ 4,419,533
Revenue (as a percent) | 53.00% | 54.00% | 56.00%
Time-and-materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,296,965 | $ 2,017,094 | $ 1,962,999
Revenue (as a percent) | 25.00% | 24.00% | 25.00%
Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,053,495 | $ 1,832,344 | $ 1,476,406
Revenue (as a percent) | 22.00% | 22.00% | 19.00%

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