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Acquisition of Citizen Engagement Centers Business - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 16, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Cash payment to acquire business |  |  |  | $ 421,809,000 | $ 157,000 |
Payments to acquire software licenses |  |  |  | 18,541,000 | $ 13,175,000 |
Goodwill |  | $ 587,751,000 |  | 587,751,000 |  | $ 399,882,000
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 |  |  |  |  |
Estimated cash consideration |  | 430,573,000 | $ 429,335,000 |  |  |
Business combination, acquisition related costs |  |  |  | 2,700,000 |  | $ 500,000
Payments to acquire software licenses |  |  |  | 4,500,000 |  |
Goodwill | 188,100,000 | 188,062,000 | 187,877,000 | 188,062,000 |  |
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 2 months 12 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 7 months 6 days |  |
Trademarks and trade names | Weighted Average |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful life |  |  |  | 9 months 18 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 |  |

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