Quarterly report pursuant to Section 13 or 15(d)

Acquisition of Citizen Engagement Centers Business - Narrative (Details)

v3.19.2
Acquisition of Citizen Engagement Centers Business - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Nov. 16, 2018
Nov. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Business Acquisition [Line Items]                
Cash payment to acquire business           $ 422,049,000 $ 157,000  
Payments to acquire software licenses           39,033,000 21,552,000  
Goodwill     $ 583,703,000     583,703,000   $ 399,882,000
Amortization of intangible assets     9,049,000 $ 2,525,000   24,026,000 $ 7,846,000  
Goodwill, impairment loss           0    
General Dynamics Information Technology's Citizen Engagement Centers                
Business Acquisition [Line Items]                
Cash payment to acquire business $ 400,000,000.0 $ 421,800,000            
Estimated cash consideration 430,700,000   430,699,000   $ 430,573,000      
Business combination, acquisition related costs           2,700,000   $ 500,000
Payments to acquire software licenses           4,500,000    
Goodwill 184,600,000   184,614,000   188,062,000 184,614,000    
Intangible assets 122,300,000   122,300,000   $ 122,300,000 $ 122,300,000    
Average weighted intangible assets useful life (years)           7 years 7 months 6 days    
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 1 month 6 days    
Customer contracts and relationships | Weighted Average                
Business Acquisition [Line Items]                
Useful life           9 years 2 months 12 days    
Technology-based Rights | Weighted Average                
Business Acquisition [Line Items]                
Useful life           4 years 3 months 18 days    
Trademarks and trade names | Weighted Average                
Business Acquisition [Line Items]                
Useful life           7 months 6 days    
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    
Pro Forma | Customer relationships - U.S. Census | General Dynamics Information Technology's Citizen Engagement Centers                
Business Acquisition [Line Items]                
Amortization of intangible assets     $ 4,600,000     $ 13,900,000