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Revenue Recognition - Reserves for Variable Consideration and Credit Risk (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Dec. 28, 2019
Adjustments to the allowances for accounts receivable and unbilled services related to reserves for credit risk |  |  |  |  |
Beginning balance |  |  | $ 370 | $ 639 | $ 639
Cumulative effect of a change in accounting principle related to ASC 326 |  |  | 203 |  |
Provision for credit loss expense, net of recoveries |  |  | (43) |  | 173
Amounts written off |  |  | (138) |  | (442)
Ending balance | $ 392 |  | 392 |  | $ 370
Bad debt expense, net of recoveries of previously written off allowances |  |  |  |  |
Bad debt expense (recovery), net | (102) | $ 48 | (43) | 31 |
Roll forward of the variable consideration and allowances for unbilled services |  |  |  |  |
Additions to reserves for variable consideration | 1,705 | 2,725 | 3,119 | 4,158 |
Reimbursable expenses | $ 14,815 | $ 12,178 | $ 31,245 | $ 25,013 |

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