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Acquisition of Citizen Engagement Centers Business - Components of Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 258,898 | $ 139,359
Accumulated Amortization | 63,544 | 51,324
Intangible Assets, net | 195,354 | 88,035
Customer contracts and relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 248,770 | 129,113
Accumulated Amortization | 54,838 | 42,683
Intangible Assets, net | 193,932 | 86,430
Technology based intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 5,648 | 5,750
Accumulated Amortization | 4,267 | 4,212
Intangible Assets, net | 1,381 | 1,538
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 4,480 | 4,496
Accumulated Amortization | 4,439 | 4,429
Intangible Assets, net | $ 41 | $ 67

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