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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Disaggregation of Revenue
Consulting services revenues	$ 148,441	$ 136,412	$ 445,925	$ 431,167
United States
Disaggregation of Revenue
Consulting services revenues	121,496	109,387	358,583	347,444
United Kingdom
Disaggregation of Revenue
Consulting services revenues	20,069	20,177	63,322	63,203
Other
Disaggregation of Revenue
Consulting services revenues	6,876	6,848	24,020	20,520
Fixed-price
Disaggregation of Revenue
Consulting services revenues	24,201	31,741	80,515	101,419
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 124,240	$ 104,671	$ 365,410	$ 329,748

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