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Income Taxes (Components of earnings (loss) before income taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Income Tax Disclosure [Line Items]      
Loss from continuing operations before income taxes $ (50,042) $ (16,181) $ (141,036)
Canada [Member]      
Income Tax Disclosure [Line Items]      
Loss from continuing operations before income taxes (14,700) (11,295) (13,408)
U.S. [Member]      
Income Tax Disclosure [Line Items]      
Loss from continuing operations before income taxes (34,521) (5,548) (126,042)
Other [Member]      
Income Tax Disclosure [Line Items]      
Loss from continuing operations before income taxes $ (821) $ 662 $ (1,586)