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REVENUE RECOGNITION - Disaggregation of Revenue by Contract Type, Customer Information and Prime or Subcontractor (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,495,581	$ 1,465,600	$ 1,395,469	$ 1,363,392	$ 1,373,878	$ 1,264,958	$ 1,181,641	$ 1,165,864	$ 5,720,042	$ 4,986,341	$ 4,467,860
Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue									5,221,300	4,586,330
Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue									498,742	400,011
Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue									3,999,261	3,489,854
Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue									1,467,801	1,263,681
Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue									252,980	232,806
Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue									3,274,707	2,764,291
Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue									1,629,475	1,465,559
Time and materials
Disaggregation Of Revenue [Line Items]
Revenue									815,860	756,491
Domestic
Disaggregation Of Revenue [Line Items]
Revenue									5,556,672	4,829,450	4,304,602
Domestic | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue									5,057,930	4,429,439
Domestic | Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue									498,742	400,011
Domestic | Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue									3,999,261	3,489,854
Domestic | Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue									1,467,801	1,263,681
Domestic | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue									89,610	75,915
Domestic | Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue									3,274,707	2,764,291
Domestic | Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue									1,524,381	1,365,052
Domestic | Time and materials
Disaggregation Of Revenue [Line Items]
Revenue									757,584	700,107
International
Disaggregation Of Revenue [Line Items]
Revenue									163,370	156,891	$ 163,258
International | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue									163,370	156,891
International | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue									163,370	156,891
International | Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue									105,094	100,507
International | Time and materials
Disaggregation Of Revenue [Line Items]
Revenue									$ 58,276	$ 56,384

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