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Acquisition of Citizen Engagement Centers Business - Contribution of the acquired business (Details) - General Dynamics Information Technology's Citizen Engagement Centers - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Revenue contributed from acquired business	$ 176,003	$ 277,266
Gross profit contributed from acquired business	$ 32,672	$ 51,620

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