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Inventories (Change in the inventory reserve) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Inventories [Roll Forward]    
Balance, beginning of year $ 9,461 $ 9,975
Additions to reserve during the year 12,487 12,169
Reserves applied and inventories written off during the year (10,697) (12,612)
Effect of foreign exchange rate differences (27) (71)
Balance, end of year $ 11,224 $ 9,461