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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Disaggregation of Revenue
Consulting services revenues	$ 171,442	$ 161,965	$ 343,230	$ 314,810
United States
Disaggregation of Revenue
Consulting services revenues	138,601	126,894	280,805	244,766
United Kingdom
Disaggregation of Revenue
Consulting services revenues	22,161	26,396	43,315	52,045
Other
Disaggregation of Revenue
Consulting services revenues	10,680	8,675	19,110	17,999
Fixed-price
Disaggregation of Revenue
Consulting services revenues	29,292	27,896	59,373	54,729
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 142,150	$ 134,069	$ 283,857	$ 260,081

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