Quarterly report pursuant to Section 13 or 15(d)

Acquisition of Citizen Engagement Centers Business - Narrative (Details)

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Acquisition of Citizen Engagement Centers Business - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Nov. 16, 2018
Mar. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Business Acquisition [Line Items]          
Cash payment to acquire businesses     $ (421,809,000) $ 0  
Payments to acquire software licenses     9,973,000 $ 6,514,000  
Goodwill     585,735,000   $ 399,882,000
Goodwill, impairment loss     0    
General Dynamics Information Technology's Citizen Engagement Centers          
Business Acquisition [Line Items]          
Contracted purchase price, adjusted for net working capital $ 400,000,000        
Cash payment to acquire businesses (421,800,000)        
Estimated cash consideration 429,335,000        
Business combination, acquisition related costs     2,700,000   $ 500,000
Payments to acquire software licenses     $ 4,500,000    
Goodwill 187,877,000        
Intangible assets 122,300,000        
Average weighted intangible assets useful life (years)     7 years 7 months    
Revenue contributed from acquired business     $ 101,300,000    
Gross profit contributed from acquired business     $ 18,900,000    
General Dynamics Information Technology's Citizen Engagement Centers | Line of Credit          
Business Acquisition [Line Items]          
Proceeds from long-term lines of credit $ 150,000,000        
Weighted Average          
Business Acquisition [Line Items]          
Useful life     9 years 3 months    
Customer contracts and relationships | Weighted Average          
Business Acquisition [Line Items]          
Useful life     9 years 3 months    
Technology-based Rights | Weighted Average          
Business Acquisition [Line Items]          
Useful life     4 years 10 months    
Trademarks and trade names | Weighted Average          
Business Acquisition [Line Items]          
Useful life     1 year 1 month    
Customer relationships - all contracts except U.S. Census | General Dynamics Information Technology's Citizen Engagement Centers          
Business Acquisition [Line Items]          
Useful life     10 years    
Customer relationships - U.S. Census | General Dynamics Information Technology's Citizen Engagement Centers          
Business Acquisition [Line Items]          
Useful life     2 years    
Scenario, Forecast | General Dynamics Information Technology's Citizen Engagement Centers          
Business Acquisition [Line Items]          
Estimated cash consideration   $ 429,300,000