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Segmented Information (Revenues from External Customers) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Segment Reporting Information [Line Items]      
Revenues $ 1,190,022 $ 1,260,852 $ 1,279,593
U.S. [Member]      
Segment Reporting Information [Line Items]      
Revenues 929,320 984,122 1,001,417
Canada [Member]      
Segment Reporting Information [Line Items]      
Revenues 22,807 29,055 27,929
Europe and Other [Member]      
Segment Reporting Information [Line Items]      
Revenues $ 237,895 $ 247,675 $ 250,247