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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 |  |  |

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