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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
	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
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations									$ 239,482		$ 282,472	$ 285,887
Consulting [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations										$ 228,080	257,423	260,853
Software License Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations										6,730	3,414	3,670
Revenue Before Reimbursements [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from continuing operations	$ 59,223	$ 57,769	$ 52,632	$ 65,186	$ 63,736	$ 66,755	$ 67,976	$ 62,370	$ 234,810	$ 234,810	$ 260,837	$ 264,523

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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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