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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Disaggregation of Revenue
Consulting services revenues	$ 149,102	$ 148,237	$ 297,484	$ 294,755
United States
Disaggregation of Revenue
Consulting services revenues	120,168	120,810	237,087	238,057
United Kingdom
Disaggregation of Revenue
Consulting services revenues	20,843	19,740	43,253	43,026
Other
Disaggregation of Revenue
Consulting services revenues	8,091	7,687	17,144	13,672
Fixed-price
Disaggregation of Revenue
Consulting services revenues	27,541	36,245	56,314	69,678
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 121,561	$ 111,992	$ 241,170	$ 225,077

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