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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Disaggregation of Revenue
Consulting services revenues	$ 167,748	$ 147,553	$ 510,979	$ 462,363
United States
Disaggregation of Revenue
Consulting services revenues	136,223	117,420	417,029	362,186
United Kingdom
Disaggregation of Revenue
Consulting services revenues	20,821	21,227	64,136	73,272
Other
Disaggregation of Revenue
Consulting services revenues	10,704	8,906	29,814	26,905
Fixed-price
Disaggregation of Revenue
Consulting services revenues	30,670	26,856	90,043	81,585
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 137,078	$ 120,697	$ 420,936	$ 380,778

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