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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue
Consulting services revenues	$ 185,891	$ 167,748	$ 554,620	$ 510,979
United States
Disaggregation of Revenue
Consulting services revenues	146,116	136,223	447,575	417,029
United Kingdom
Disaggregation of Revenue
Consulting services revenues	28,345	20,821	73,932	64,136
Other
Disaggregation of Revenue
Consulting services revenues	11,430	10,704	33,113	29,814
Fixed-price
Disaggregation of Revenue
Consulting services revenues	31,590	30,670	91,332	90,043
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 154,301	$ 137,078	$ 463,288	$ 420,936

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