v2.4.0.8
Income taxes (Deferred income taxes) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Income Tax Disclosure [Abstract]        
Deferred Tax Assets Property Plant And Equipment Intangibles $ (32,654) $ (33,476) $ (29,088)  
Deferred Tax Assets Capital And Non Capital Loss Carryforwards 14,822 16,076 16,240  
Deferred Tax Assets, Tax Credit Carryforwards, Research 4,974 5,086 4,908  
Deferred Tax Assets Share Issuance Costs 354 368 191  
Deferred Tax Assets, Inventory 2,106 1,944 2,423  
Deferred Tax Assets, Other 3,863 1,241 2,124  
Deferred Tax Assets, Gross (6,535) (8,761) (3,202)  
Valuation Allowance, Amount 6,535 3,145 4,547 5,880
Deferred Tax Assets, Net, Total $ (13,070) $ (11,906) $ (7,749)