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Summary of Significant Accounting Policies (Inventories) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Inventory, Net [Abstract]    
Finished products $ 98,527 $ 118,633
Materials and work in process 70,264 75,526
Last-in, first-out ("LIFO") allowance (30,980) (30,694)
Inventories, net $ 137,811 $ 163,465
Inventory valued by the LIFO costing method 75.00% 65.00%
Effect of LIFO inventory, decrease (increase) in cost of goods sold $ (600) $ (2,200)