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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Allowance for doubtful accounts | $ 400 | $ 700 |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |
Balance at, beginning of year | 3,764 | 5,252 |
Increases to reserves | 2,926 | 3,675 |
Amounts written off | (2,866) | (5,173) |
Effects of foreign currency translation | 14 | 10 |
Balance at, end of year | 3,838 | 3,764 | $ 5,252
Roll forward of the variable consideration and allowances for unbilled services |  |  |
Balance at beginning of year | 415 | 704 |
Increases to reserves | 5,548 | 4,755 |
Amounts written off | (4,467) | (5,042) |
Effects of foreign currency translation | (7) | 2 |
Balance at end of year | 1,503 | 415 | 704
Reimbursable expenses | 54,871 | 48,817 | $ 41,465
Selling, general and administrative expenses |  |  |
Roll forward of the variable consideration and allowances for accounts receivable |  |  |
Amounts written off | $ (173) | $ (1,237) |

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