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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 2,249,600	$ 1,989,066
Total revenue (as a percent)	100.00%	100.00%
Prime Contractor
Disaggregation of Revenue [Line Items]
Revenue	$ 2,131,295	$ 1,861,722
Total revenue (as a percent)	95.00%	94.00%
Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 118,305	$ 127,344
Total revenue (as a percent)	5.00%	6.00%
Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 2,186,588	$ 1,945,575
Total revenue (as a percent)	97.00%	98.00%
Defense Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 1,019,991	$ 973,605
Total revenue (as a percent)	45.00%	49.00%
Intelligence Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 408,883	$ 379,174
Total revenue (as a percent)	18.00%	19.00%
Civil Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 757,714	$ 592,796
Total revenue (as a percent)	34.00%	30.00%
Global Commercial Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 63,012	$ 43,491
Total revenue (as a percent)	3.00%	2.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,190,828	$ 1,115,426
Total revenue (as a percent)	53.00%	56.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 545,902	$ 497,449
Total revenue (as a percent)	24.00%	25.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 512,870	$ 376,191
Total revenue (as a percent)	23.00%	19.00%

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- Definition

Revenue From Contract With Customer, Excluding Assessed Tax, Percentage

+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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