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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	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Revenue contributed from acquired business	$ 163,381	$ 440,647
Gross profit contributed from acquired business	$ 31,943	$ 83,563

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