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Geographic and Group Information (Geographic Revenue before Reimbursements) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2021
Jun. 26, 2020
Jul. 02, 2021
Jun. 26, 2020
Jun. 26, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue from continuing operations before reimbursements $ 73,197 $ 52,751 $ 136,683 $ 122,284  
Revenue from Continuing Operations Before Reimbursement [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue from continuing operations before reimbursements 72,997 52,632 136,407 117,818 $ 117,818
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 reimbursements 66,569 47,515 123,707 104,569  
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 reimbursements $ 6,428 $ 5,117 $ 12,700 $ 13,249