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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022
Disaggregation of Revenue
Consulting services revenues	$ 152,845	$ 148,382
United States
Disaggregation of Revenue
Consulting services revenues	117,872	116,919
United Kingdom
Disaggregation of Revenue
Consulting services revenues	25,649	22,410
Other
Disaggregation of Revenue
Consulting services revenues	9,324	9,053
Fixed-price
Disaggregation of Revenue
Consulting services revenues	26,777	28,773
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 126,068	$ 119,609

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