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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, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,373,878	$ 1,264,958	$ 1,181,641	$ 1,165,864	$ 1,170,086	$ 1,124,100	$ 1,087,860		$ 1,085,814	$ 4,986,341	$ 4,467,860	$ 4,354,617
Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue										4,586,330
Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue										400,011
Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue										3,489,854
Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue										1,263,681
Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue										232,806
Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue										2,764,291
Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue										1,465,559
Time and materials
Disaggregation Of Revenue [Line Items]
Revenue										756,491
Domestic
Disaggregation Of Revenue [Line Items]
Revenue										4,829,450	4,304,602	4,217,488
Domestic | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue										4,429,439
Domestic | Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue										400,011
Domestic | Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue										3,489,854
Domestic | Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue										1,263,681
Domestic | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue										75,915
Domestic | Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue										2,764,291
Domestic | Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue										1,365,052
Domestic | Time and materials
Disaggregation Of Revenue [Line Items]
Revenue										700,107
International
Disaggregation Of Revenue [Line Items]
Revenue										156,891	$ 163,258	$ 137,129
International | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue										156,891
International | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue										156,891
International | Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue										100,507
International | Time and materials
Disaggregation Of Revenue [Line Items]
Revenue										$ 56,384
[1] Net income for the second quarter of FY2019 includes a net benefit related to the TCJA. See Note 19.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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