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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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