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Inventories (Details) - USD ($)
$ in Thousands
Apr. 03, 2021
Jan. 02, 2021
Inventories    
Finished products $ 113,531 $ 98,527
Materials and work in process 71,625 70,264
Last-in, first-out ("LIFO") allowance (30,980) (30,980)
Total inventories $ 154,176 $ 137,811
Inventory valued by the LIFO costing method 77.00% 75.00%