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Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2023	Sep. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 30, 2022	Sep. 30, 2022	Jul. 01, 2022	Apr. 01, 2022	Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 72,403	$ 75,856	$ 77,102	$ 71,229	$ 70,117	$ 72,033	$ 75,928	$ 75,664	$ 296,590	$ 293,742	$ 278,809
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									251,012	253,935	244,499
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									28,648	23,866	20,627
Other (Australia, Canada, India and Uruguay) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									16,930	15,941	13,683
Revenue from Continuing Operations Before Reimbursement [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 291,273	$ 289,688	$ 277,583

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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