Income Taxes - Schedule of Changes in Valuation Allowance (Details) - Vencore Holding Corp. and KGS Holding Corp. - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance, Deferred Tax Asset [Roll Forward]
Beginning balance	$ 119,419	$ 180,584	$ 171,600
Increases (decreases)	0	(61,165)	8,984
Ending balance	$ 119,419	$ 119,419	$ 180,584

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant