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Inventories (Schedule of inventory reserve) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Inventories [Roll Forward]    
Balance, beginning of year $ 5,742 $ 8,135
Additions to reserve during the year 5,854 3,081
Reserves applied and inventories written off during the year (6,812) (5,474)
Balance, end of year $ 4,784 $ 5,742