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Geographic and Service Group Information (Geographic Revenue before Reimbursement) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Oct. 01, 2021 | Jul. 02, 2021 | Apr. 02, 2021 | Jan. 01, 2021 | Sep. 25, 2020 | Jun. 26, 2020 | Mar. 27, 2020 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 27, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement |  |  |  |  |  |  |  |  | $ 278,809 | $ 239,482 | $ 282,472
Revenue from Continuing Operations Before Reimbursement [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement | $ 69,776 | $ 71,400 | $ 72,997 | $ 63,410 | $ 59,223 | $ 57,769 | $ 52,632 | $ 65,186 | 277,583 | 234,810 | 260,837
Revenue from Continuing Operations Before Reimbursement [Member] | North America [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement |  |  |  |  |  |  |  |  | 254,107 | 208,329 | 221,823
Revenue from Continuing Operations Before Reimbursement [Member] | International (Primarily European Countries) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from continuing operations before reimbursement |  |  |  |  |  |  |  |  | $ 23,476 | $ 26,481 | $ 39,014

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