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REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenue $ 8,363,700 $ 7,858,938 $ 7,463,841
Revenue (as a percent) 100.00% 100.00% 100.00%
Prime Contractor      
Disaggregation of Revenue [Line Items]      
Revenue $ 7,864,273 $ 7,311,313 $ 6,884,763
Revenue (as a percent) 94.00% 93.00% 92.00%
Sub-contractor      
Disaggregation of Revenue [Line Items]      
Revenue $ 499,427 $ 547,625 $ 579,078
Revenue (as a percent) 6.00% 7.00% 8.00%
Global Commercial Clients      
Disaggregation of Revenue [Line Items]      
Revenue $ 216,276 $ 205,834 $ 266,515
Revenue (as a percent) 3.00% 3.00% 4.00%
Total U.S. government      
Disaggregation of Revenue [Line Items]      
Revenue $ 8,147,424 $ 7,653,104 $ 7,197,326
Revenue (as a percent) 97.00% 97.00% 96.00%
Total U.S. government | Defense Clients      
Disaggregation of Revenue [Line Items]      
Revenue $ 3,955,473 $ 3,920,503 $ 3,596,081
Revenue (as a percent) 47.00% 49.00% 47.00%
Total U.S. government | Intelligence Clients      
Disaggregation of Revenue [Line Items]      
Revenue $ 1,573,037 $ 1,549,417 $ 1,580,925
Revenue (as a percent) 19.00% 20.00% 22.00%
Total U.S. government | Civil Clients      
Disaggregation of Revenue [Line Items]      
Revenue $ 2,618,914 $ 2,183,184 $ 2,020,320
Revenue (as a percent) 31.00% 28.00% 27.00%
Cost-reimbursable      
Disaggregation of Revenue [Line Items]      
Revenue $ 4,514,262 $ 4,419,533 $ 4,211,592
Revenue (as a percent) 54.00% 56.00% 57.00%
Time-and-materials      
Disaggregation of Revenue [Line Items]      
Revenue $ 2,017,094 $ 1,962,999 $ 1,737,414
Revenue (as a percent) 24.00% 25.00% 23.00%
Fixed-price      
Disaggregation of Revenue [Line Items]      
Revenue $ 1,832,344 $ 1,476,406 $ 1,514,835
Revenue (as a percent) 22.00% 19.00% 20.00%