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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Disaggregation of Revenue
Consulting services revenues	$ 161,965	$ 149,102	$ 314,810	$ 297,484
United States
Disaggregation of Revenue
Consulting services revenues	126,894	120,168	244,766	237,087
United Kingdom
Disaggregation of Revenue
Consulting services revenues	26,396	20,843	52,045	43,253
Other
Disaggregation of Revenue
Consulting services revenues	8,675	8,091	17,999	17,144
Fixed-price
Disaggregation of Revenue
Consulting services revenues	28,082	27,541	54,859	56,314
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 133,883	$ 121,561	$ 259,951	$ 241,170

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