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Revenues and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2026 | Jun. 28, 2025 | Jul. 04, 2026 | Jun. 28, 2025
Disaggregation of Revenue |  |  |  |
Consulting services revenues | $ 210,815 | $ 186,878 | $ 411,790 | $ 368,729
United States |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 165,217 | 151,745 | 325,230 | 301,458
United Kingdom |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 30,120 | 22,463 | 58,144 | 45,587
Other |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 15,478 | 12,670 | 28,416 | 21,684
Fixed-price |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | 48,053 | 29,413 | 83,873 | 59,742
Time-and-materials |  |  |  |
Disaggregation of Revenue |  |  |  |
Consulting services revenues | $ 162,762 | $ 157,465 | $ 327,917 | $ 308,987

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