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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 |  |

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