Income Taxes (Components of provision for (recovery of) income taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Tax Disclosure [Line Items]
Current income tax provision (recovery)	$ (13,713)	$ (3,915)	$ (6,316)
Deferred income tax provision (recovery)	10,973	814	(7,250)
Provision for (recovery of) income taxes	(2,740)	(3,101)	(13,566)
Canada [Member]
Income Tax Disclosure [Line Items]
Current income tax provision (recovery)	(154)	(1,023)	(1,334)
Deferred income tax provision (recovery)	(291)	33	547
U.S. [Member]
Income Tax Disclosure [Line Items]
Current income tax provision (recovery)	(14,148)	(3,424)	(5,303)
Deferred income tax provision (recovery)	10,442	731	(7,880)
Other [Member]
Income Tax Disclosure [Line Items]
Current income tax provision (recovery)	589	532	321
Deferred income tax provision (recovery)	$ 822	$ 50	$ 83

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration