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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 2,298,976	$ 2,106,038	$ 4,548,576	$ 4,095,104
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	$ 2,179,375	$ 1,978,216	$ 4,310,670	$ 3,839,939
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	95.00%	94.00%	95.00%	94.00%
Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 119,601	$ 127,822	$ 237,906	$ 255,165
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	5.00%	6.00%	5.00%	6.00%
Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 2,235,433	$ 2,055,016	$ 4,422,021	$ 4,000,591
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%	98.00%	97.00%	98.00%
Defense Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 1,019,108	$ 996,463	$ 2,039,099	$ 1,970,069
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)	44.00%	48.00%	45.00%	48.00%
Intelligence Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 432,543	$ 396,415	$ 841,426	$ 775,588
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)	19.00%	19.00%	18.00%	19.00%
Civil Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 783,782	$ 662,138	$ 1,541,496	$ 1,254,934
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%	31.00%	34.00%	31.00%
Global Commercial Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 63,543	$ 51,022	$ 126,555	$ 94,513
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	3.00%	2.00%	3.00%	2.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,201,407	$ 1,127,189	$ 2,392,235	$ 2,242,614
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	52.00%	53.00%	53.00%	55.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 564,438	$ 500,263	$ 1,110,340	$ 997,713
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%	24.00%	24.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 533,131	$ 478,586	$ 1,046,001	$ 854,777
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	23.00%	23.00%	23.00%	21.00%

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