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Basis of Presentation and General Information (Summary of Disaggregation of Revenue before Reimbursements from Continuing Operations (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
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations									$ 278,809	$ 239,482	$ 282,472
Consulting [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations									267,282	228,080	257,423
Software License Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations									10,301	6,730	3,414
Revenue Before Reimbursements [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations	$ 69,776	$ 71,400	$ 72,997	$ 63,410	$ 59,223	$ 57,769	$ 52,632	$ 65,186	$ 277,583	$ 234,810	$ 260,837

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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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