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Geographic and Service Group Information (Geographic Revenue from Continuing Operations before Reimbursement) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2021	Sep. 25, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Jan. 01, 2021	Jan. 01, 2021	Dec. 27, 2019	Dec. 28, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursement									$ 239,482		$ 282,472	$ 285,887
Revenue from Continuing Operations Before Reimbursement [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursement	$ 59,223	$ 57,769	$ 52,632	$ 65,186	$ 63,736	$ 66,755	$ 67,976	$ 62,370	234,810	$ 234,810	260,837	264,523
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									208,329		221,823	222,054
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									$ 26,481		$ 39,014	$ 42,469

X

- Definition

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.

+ References

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