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Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2024	Sep. 27, 2024	Jun. 28, 2024	Mar. 29, 2024	Dec. 29, 2023	Sep. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 79,235	$ 79,777	$ 77,656	$ 77,187	$ 72,403	$ 75,856	$ 77,102	$ 71,229	$ 313,855	$ 296,590	$ 293,742
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									259,443	251,012	253,935
Europe (U.K., Germany, France and Switzerland)
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									35,287	28,648	23,866
Other (Australia, Canada, India and Uruguay) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 19,125	$ 16,930	$ 15,941

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