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Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2022	Sep. 30, 2022	Jul. 01, 2022	Apr. 01, 2022	Dec. 31, 2021	Oct. 01, 2021	Jul. 02, 2021	Apr. 02, 2021	Dec. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 70,117	$ 72,033	$ 75,928	$ 75,664	$ 70,232	$ 71,894	$ 73,197	$ 63,486	$ 293,742	$ 278,809	$ 239,482
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									253,935	244,499	205,203
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									23,866	20,627	23,764
Other (Australia, Canada, India and Uruguay) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									15,941	13,683	10,515
Revenue from Continuing Operations Before Reimbursement [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 289,688	$ 277,583	$ 234,810

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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