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Revenue and Allowances - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Disaggregation of Revenue |  |  |  |
Allowance for doubtful accounts | $ 500 | $ 700 |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Balance at, beginning of year | 3,595 | 3,838 |  |
Increases to reserves, net of recoveries | 2,612 | 2,092 |  |
Amounts written off and foreign currency translation | (2,951) | (2,335) |  |
Balance at, end of year | 3,256 | 3,595 | $ 3,838 |
Cumulative effect of a change in accounting principle | 205,834 | 209,019 | 197,751 | $ 196,472
Roll forward of the variable consideration and allowances for unbilled services |  |  |  |
Balance at beginning of year | 1,000 | 1,503 |  |
Increases to reserves, net of recoveries | 7,574 | 6,847 |  |
Amounts written off and foreign currency translation | (7,210) | (7,350) |  |
Balance at end of year | 1,364 | 1,000 | 1,503 |
Accounts receivable allowances | (337) | (479) | 47 |
Reimbursable expenses | 64,532 | 61,661 | 54,871 |
Retained Earnings |  |  |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Cumulative effect of a change in accounting principle | 215,784 | 216,999 | 200,249 | $ 186,229
Cumulative Effect Period of Adoption, Adjustment |  |  |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Cumulative effect of a change in accounting principle |  |  | (203) |
Cumulative Effect Period of Adoption, Adjustment | Retained Earnings |  |  |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |  |
Cumulative effect of a change in accounting principle |  |  | (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 |  |  | (200) |
Selling, general and administrative expenses |  |  |  |
Roll forward of the variable consideration and allowances for unbilled services |  |  |  |
Accounts receivable allowances | $ 27 | $ 227 | $ 173 |

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