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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Disaggregation of Revenue
Consulting services revenues	$ 136,412	$ 121,762	$ 431,167	$ 370,951
United States
Disaggregation of Revenue
Consulting services revenues	109,387	96,117	347,444	296,273
United Kingdom
Disaggregation of Revenue
Consulting services revenues	20,177	20,358	63,203	57,355
Other
Disaggregation of Revenue
Consulting services revenues	6,848	5,287	20,520	17,323
Fixed-price
Disaggregation of Revenue
Consulting services revenues	31,741	26,197	101,419	85,968
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 104,671	$ 95,565	$ 329,748	$ 284,983

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