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Segment Information (Revenues from External Customers) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
Segment Reporting Information [Line Items]      
Segment revenues from external customers $ 812,624 $ 789,213 $ 721,596
U.S. [Member]      
Segment Reporting Information [Line Items]      
Segment revenues from external customers 772,333 752,000 691,838
Canada [Member]      
Segment Reporting Information [Line Items]      
Segment revenues from external customers 14,067 12,481 9,418
Other [Member]      
Segment Reporting Information [Line Items]      
Segment revenues from external customers $ 26,224 $ 24,732 $ 20,340