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Income Taxes (Components of income tax expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Tax Disclosure [Abstract]      
Earnings (Loss) before income taxes $ 2,617 $ (114,521) $ (170,397)
Canadian statutory rate 26.50% 26.50% 26.50%
Income tax provision (recovery) at statutory rate $ 694 $ (30,348) $ (45,155)
Impact of changes in enacted tax rates (441) 1,976 (8,437)
Foreign tax rate differential 126 2,562 (9,324)
Impact of stock-based compensation and other non- deductible expenses 1,975 2,019 1,590
Change in valuation allowance 774 (3,717) 72
Goodwill impairment loss 0 22,239 30,475
Change in unrecognized tax benefits 0 0 (452)
Other 93 (109) (4,598)
Provision for (recovery of) income taxes $ 3,221 $ (5,378) $ (35,829)