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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		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,264,958	$ 1,124,100	$ 3,612,463	$ 3,297,774
Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	1,153,599		3,335,427
Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue	111,359		277,036
Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue	887,030		2,540,093
Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue	318,374		898,491
Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	59,554		173,879
Domestic
Disaggregation Of Revenue [Line Items]
Revenue	1,225,531	1,079,953	3,494,606	3,177,659
Domestic | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	1,114,172		3,217,570
Domestic | Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue	111,359		277,036
Domestic | Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue	887,030		2,540,093
Domestic | Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue	318,374		898,491
Domestic | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	20,127		56,022
International
Disaggregation Of Revenue [Line Items]
Revenue	39,427	$ 44,147	117,857	$ 120,115
International | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	39,427		117,857
International | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	39,427		117,857
Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue	704,627		2,003,204
Cost-plus-fee | Domestic
Disaggregation Of Revenue [Line Items]
Revenue	704,627		2,003,204
Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue	374,006		1,055,384
Firm fixed-price | Domestic
Disaggregation Of Revenue [Line Items]
Revenue	348,143		982,232
Firm fixed-price | International
Disaggregation Of Revenue [Line Items]
Revenue	25,863		73,152
Time and materials
Disaggregation Of Revenue [Line Items]
Revenue	186,325		553,875
Time and materials | Domestic
Disaggregation Of Revenue [Line Items]
Revenue	172,761		509,170
Time and materials | International
Disaggregation Of Revenue [Line Items]
Revenue	$ 13,564		$ 44,705

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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