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Acquisition of Citizen Engagement Centers Business - Schedule of Asset Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 16, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 583,703 |  | $ 399,882
General Dynamics Information Technology's Citizen Engagement Centers |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration | $ 430,700 | 430,699 | $ 430,573 |
Measurement period adjustments, consideration transferred |  | 126 |  |
Billed and unbilled receivables |  | 142,165 | 141,869 |
Measurement period adjustments, billed and unbilled receivables |  | 296 |  |
Property and equipment |  | 8,974 | 6,454 |
Measurement period adjustment, property, plant, and equipment |  | 2,520 |  |
Other assets |  | 4,508 | 4,093 |
Measurement period adjustment, other assets |  | 415 |  |
Intangible assets | 122,300 | 122,300 | 122,300 |
Measurement period adjustment, intangible assets |  | 0 |  |
Total identifiable assets acquired |  | 277,947 | 274,716 |
Measurement period adjustment, total identifiable assets acquired |  | 3,231 |  |
Accounts payable and other liabilities |  | 31,862 | 32,205 |
Measurement period adjustment, accounts payable and other liabilities |  | (343) |  |
Net identifiable assets acquired |  | 246,085 | 242,511 |
Measurement period adjustment, net identifiable assets acquired |  | 3,574 |  |
Goodwill | $ 184,600 | 184,614 | 188,062 |
Measurement period adjustments, goodwill |  | (3,448) |  |
Net assets acquired |  | 430,699 | $ 430,573 |
Measurement period adjustment, net assets acquired |  | $ 126 |  |

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