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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Dec. 29, 2019 | Dec. 28, 2019 | Dec. 29, 2018
Disaggregation of Revenue |  |  |  |  |  |  |
Consulting services revenues | $ 123,031 | $ 110,573 | $ 249,189 | $ 216,422 |  |  |
Cumulative-effect adjustment to retained earnings | 208,784 |  | 208,784 |  |  | $ 200,249 |
Cumulative-effect adjustment to allowances for accounts receivable | 392 |  | 392 |  |  | 370 | $ 639
Cumulative-effect adjustment to unbilled services | 50,159 |  | 50,159 |  |  | $ 36,569 |
ASU 2016-13 Financial Instruments-Credit Losses Topic 326 | Cumulative-effect adjustment |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Cumulative-effect adjustment to retained earnings |  |  |  |  | $ 200 |  |
Cumulative-effect adjustment to allowances for accounts receivable |  |  |  |  | 200 |  |
Cumulative-effect adjustment to unbilled services |  |  |  |  | $ 200 |  |
United States |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Consulting services revenues | 99,416 | 87,475 | 200,156 | 171,004 |  |  |
United Kingdom |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Consulting services revenues | 17,931 | 17,404 | 36,997 | 35,911 |  |  |
Other |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Consulting services revenues | 5,684 | 5,694 | 12,036 | 9,507 |  |  |
Fixed Price |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Consulting services revenues | 30,783 | 25,179 | 59,771 | 46,565 |  |  |
Time-and-materials |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Consulting services revenues | $ 92,248 | $ 85,394 | $ 189,418 | $ 169,857 |  |  |

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