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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Disaggregation of Revenue
Consulting services revenues	$ 148,382	$ 146,518
United States
Disaggregation of Revenue
Consulting services revenues	116,919	117,247
United Kingdom
Disaggregation of Revenue
Consulting services revenues	22,410	23,286
Other
Disaggregation of Revenue
Consulting services revenues	9,053	5,985
Fixed-price
Disaggregation of Revenue
Consulting services revenues	28,773	33,433
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 119,609	$ 113,085

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