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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - Vencore Holding Corp. and KGS Holding Corp.
3 Months Ended 12 Months Ended
Mar. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Rate Reconciliation [Line Items]        
U.S. statutory tax rate 21.00% 35.00% 35.00% 35.00%
Equity based awards 0.00% 7.30% (0.20%) 3.20%
Noncash income or gain (0.00%) (0.00%) (0.00%) (6.20%)
Valuation allowance (4.00%) (450.10%) (10.30%) (15.60%)
Amortization of intangible assets 3.20% 70.70% 27.00% 27.50%
State tax expense 3.00% 7.40% 3.10% 2.50%
Uncertain tax position interest 0.00% 2.10% 0.90% 0.90%
Tax Cuts and Jobs Act of 2017 0.00% 266.10% 0.00% 0.00%
Other 0.50% 2.70% 0.70% 0.80%
Effective tax rate 23.70% (58.80%) 56.20% 48.10%