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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Disaggregation of Revenue
Consulting services revenues	$ 186,878	$ 171,442	$ 368,729	$ 343,230
United States
Disaggregation of Revenue
Consulting services revenues	151,745	138,601	301,458	280,805
United Kingdom
Disaggregation of Revenue
Consulting services revenues	22,463	22,161	45,587	43,315
Other
Disaggregation of Revenue
Consulting services revenues	12,670	10,680	21,684	19,110
Fixed-price
Disaggregation of Revenue
Consulting services revenues	29,413	29,292	59,742	59,373
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 157,465	$ 142,150	$ 308,987	$ 283,857

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