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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		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,181,641	$ 1,087,860	$ 2,347,505	$ 2,173,674
Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	1,091,956		2,181,828
Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue	89,685		165,677
Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue	834,797		1,653,063
Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue	287,915		580,117
Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	58,929		114,325
Domestic
Disaggregation Of Revenue [Line Items]
Revenue	1,142,552	1,046,823	2,269,075	2,097,706
Domestic | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	1,052,867		2,103,398
Domestic | Subcontractor
Disaggregation Of Revenue [Line Items]
Revenue	89,685		165,677
Domestic | Department of Defense
Disaggregation Of Revenue [Line Items]
Revenue	834,797		1,653,063
Domestic | Federal civilian agencies
Disaggregation Of Revenue [Line Items]
Revenue	287,915		580,117
Domestic | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	19,840		35,895
International
Disaggregation Of Revenue [Line Items]
Revenue	39,089	$ 41,037	78,430	$ 75,968
International | Prime contractor
Disaggregation Of Revenue [Line Items]
Revenue	39,089		78,430
International | Commercial and other
Disaggregation Of Revenue [Line Items]
Revenue	39,089		78,430
Cost-plus-fee
Disaggregation Of Revenue [Line Items]
Revenue	657,050		1,298,577
Cost-plus-fee | Domestic
Disaggregation Of Revenue [Line Items]
Revenue	657,050		1,298,577
Firm fixed-price
Disaggregation Of Revenue [Line Items]
Revenue	337,374		681,378
Firm fixed-price | Domestic
Disaggregation Of Revenue [Line Items]
Revenue	313,018		634,089
Firm fixed-price | International
Disaggregation Of Revenue [Line Items]
Revenue	24,356		47,289
Time and materials
Disaggregation Of Revenue [Line Items]
Revenue	187,217		367,550
Time and materials | Domestic
Disaggregation Of Revenue [Line Items]
Revenue	172,484		336,409
Time and materials | International
Disaggregation Of Revenue [Line Items]
Revenue	$ 14,733		$ 31,141

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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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