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Share-based Compensation - Narrative (Details) - Vencore
$ in Millions
3 Months Ended 12 Months Ended
Mar. 30, 2018
USD ($)
plan
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation $ 0.3 $ 0.2 $ 3.6 $ (0.2) $ 4.0
Share based compensation liability 10.5   10.2 6.6  
Fair value of share-based compensation $ 10.5   $ 13.6 $ 8.2  
Phantom Equity Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights, percentage       20.00%  
Vesting period       5 years  
Class B and Class B-1 | Stock Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of compensation plans | plan 2        
Percentage of aggregate Membership Interests authorized for issuance 7.40%        
Award vesting rights, percentage 20.00%        
Aggregate outstanding grants as a percentage of Membership Interest     5.55% 5.55%  
Percentage of membership interests that are nonvested 28.00%   29.00% 25.00% 46.00%
Class A Membership          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual rate of return on investment for Class A membership interest 8.00%        
Class B Membership | Phantom Equity Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate outstanding grants as a percentage of Membership Interest     1.85% 0.62%