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Postretirement Plans - Schedule of Benefit Payments Expected to be Paid (Details) - Vencore Holding Corp. and KGS Holding Corp. - USD ($)
Mar. 30, 2018
Dec. 31, 2017
Pension Plan | Qualified Plan    
Defined Benefit Plan Disclosure [Line Items]    
2018 $ 22,425,000 $ 0
2019 22,651,000  
2020 22,906,000  
2021 23,202,000  
2022 23,503,000  
Years 2023 ‑ 2027 132,951,000  
Pension Plan | Nonqualified Plan    
Defined Benefit Plan Disclosure [Line Items]    
2018 412,000  
2019 429,000  
2020 466,000  
2021 505,000  
2022 574,000  
Years 2023 ‑ 2027 2,850,000  
Medical Plan    
Defined Benefit Plan Disclosure [Line Items]    
2018 395,000  
2019 414,000  
2020 424,000  
2021 425,000  
2022 440,000  
Years 2023 ‑ 2027 $ 2,275,000