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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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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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