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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
	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,363,392	$ 1,165,864
Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	1,236,253	1,089,872
Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue	127,139	75,992
Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue	937,640	818,266
Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue	363,993	292,202
Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	61,759	55,396
Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue	747,714	641,527
Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue	417,976	344,004
Time and materials
Disaggregation Of Revenue [Line Items]
Revenue	197,702	180,333
Domestic
Disaggregation Of Revenue [Line Items]
Revenue	1,324,773	1,126,523
Domestic | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	1,197,634	1,050,531
Domestic | Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue	127,139	75,992
Domestic | Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue	937,640	818,266
Domestic | Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue	363,993	292,202
Domestic | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	23,140	16,055
Domestic | Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue	747,714	641,527
Domestic | Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue	391,536	321,071
Domestic | Time and materials
Disaggregation Of Revenue [Line Items]
Revenue	185,523	163,925
International
Disaggregation Of Revenue [Line Items]
Revenue	38,619	39,341
International | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	38,619	39,341
International | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	38,619	39,341
International | Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue	26,440	22,933
International | Time and materials
Disaggregation Of Revenue [Line Items]
Revenue	$ 12,179	$ 16,408

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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