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Income Taxes (Deferred income taxes) (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Tax Disclosure [Abstract]      
Differences in property, plant and equipment and intangible assets $ (54,541) $ (54,841)  
Capital and non-capital losses 26,540 25,169  
Tax benefit of scientific research expenditures 1,506 2,004  
Inventory basis differences 2,248 3,755  
Interest expense limitation 19,118 20,025  
Other accrued reserves 2,321 1,366  
Gross deferred income tax liability (2,808) (2,522)  
Less: valuation allowance (6,219) (5,445) $ (9,162)
Net deferred income tax liability $ (9,027) $ (7,967)