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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Disaggregation of Revenue
Consulting services revenues	$ 148,237	$ 123,031	$ 294,755	$ 249,189
United States
Disaggregation of Revenue
Consulting services revenues	120,810	99,416	238,057	200,156
United Kingdom
Disaggregation of Revenue
Consulting services revenues	19,740	17,931	43,026	36,997
Other
Disaggregation of Revenue
Consulting services revenues	7,687	5,684	13,672	12,036
Fixed-price
Disaggregation of Revenue
Consulting services revenues	36,245	30,783	69,678	59,771
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 111,992	$ 92,248	$ 225,077	$ 189,418

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