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Inventories (Details) - USD ($)
$ in Thousands
Jul. 03, 2021
Jan. 02, 2021
Inventories    
Finished products $ 143,921 $ 98,527
Materials and work in process 74,526 70,264
Last-in, first-out ("LIFO") allowance (30,980) (30,980)
Total inventories $ 187,467 $ 137,811
Inventory valued by the LIFO costing method 75.00% 75.00%