Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Deferred Tax Assets, Gross [Abstract]
Non-capital loss carryforwards	$ 23,363	$ 24,536
Capital loss carryforwards	9,740	12,674
Deferred interest expense	10,181	8,990
Pension and post-retirement liability	925	3,410
Amounts currently not deductible for tax purposes	19,222	16,683
Share based compensation	3,220	3,314
Income tax credits	6,632	5,694
Lease right-of-use assets	40,921
Other	2,075	2,114
Total deferred income tax assets	116,279	77,415
Valuation allowance	(15,569)	(16,373)	$ (13,912)	$ (36,800)
Total deferred income tax assets, net of valuation allowance	100,710	61,042
Deferred income tax liabilities:
Plant and equipment	(77,882)	(64,831)
Intangibles	(32,491)	(35,740)
Basis difference in subsidiaries	(7,771)	(7,070)
Unrealized foreign exchange gain	(328)	(5,102)
Lease liabilities	(37,930)
Other	(1,828)	(1,912)
Total deferred income tax liabilities	(158,230)	(114,655)
Net deferred tax liability	$ 57,520	$ 53,613