Valuation Reserves (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 27, 2019 |
Dec. 28, 2018 |
Dec. 29, 2017 |
|
| Allowance for doubtful accounts | |||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance at Beginning of Period | $ 7,460 | $ 8,026 | $ 6,848 |
| Additions Charged to Expense | 4,981 | 3,790 | 4,061 |
| Deductions | (3,595) | (4,356) | (2,883) |
| Balance at End of Period | 8,846 | 7,460 | 8,026 |
| Allowance for deferred tax assets | |||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance at Beginning of Period | 812 | 289 | 0 |
| Additions Charged to Expense | 95 | 523 | 289 |
| Deductions | 0 | 0 | 0 |
| Balance at End of Period | $ 907 | $ 812 | $ 289 |