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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Disaggregation of Revenue |  |  |  |
Allowance for doubtful accounts | $ 700 | $ 400 |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Balance at, beginning of year | 3,838 | 3,764 |  |
Increases to reserves, net of recoveries | 2,092 | 2,926 |  |
Amounts written off and foreign currency translation | (2,335) | (2,852) |  |
Balance at, end of year | 3,595 | 3,838 | $ 3,764 |
Cumulative effect of a change in accounting principle related to ASC 326 | 209,019 | 197,751 | 196,472 | $ 207,229
Roll forward of the variable consideration and allowances for unbilled services |  |  |  |
Balance at beginning of year | 1,503 | 415 |  |
Increases to reserves, net of recoveries | 6,847 | 5,548 |  |
Amounts written off and foreign currency translation | (7,350) | (4,460) |  |
Balance at end of year | 1,000 | 1,503 | 415 |
Accounts receivable allowances | (479) | 47 | (1,410) |
Reimbursable expenses | 61,661 | 54,871 | 48,817 |
Retained Earnings |  |  |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Cumulative effect of a change in accounting principle related to ASC 326 | 216,999 | 200,249 | 186,229 | $ 169,390
Cumulative Effect Period of Adoption, Adjustment | ASC 326 |  |  |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Cumulative effect of a change in accounting principle related to ASC 326 |  | (203) |  |
Cumulative Effect Period of Adoption, Adjustment | Retained Earnings | ASC 326 |  |  |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Cumulative effect of a change in accounting principle related to ASC 326 |  | (203) |  |
Selling, general and administrative expenses |  |  |  |
Roll forward of the variable consideration and allowances for unbilled services |  |  |  |
Accounts receivable allowances | $ 227 | $ 173 | $ 1,237 |

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