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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue
Revenues	$ 687,414	$ 623,976	$ 590,901
United States
Disaggregation of Revenue
Revenues	558,803	493,923	470,233
United Kingdom
Disaggregation of Revenue
Revenues	86,533	94,445	89,235
Other
Disaggregation of Revenue
Revenues	42,078	35,608	31,433
Fixed-price
Disaggregation of Revenue
Revenues	126,657	113,983	110,129
Time-and-materials
Disaggregation of Revenue
Revenues	$ 560,757	$ 509,993	$ 480,772

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