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Property plant and equipment (Tables)
12 Months Ended
Dec. 29, 2012
Property, Plant and Equipment, Net, by Type [Abstract]  
Property Plant And Equipment [Text Block]
    December 29, 2012
    CostAccumulated depreciationNet book value
    
    $$$
Land 7,659 - 7,659
Buildings 59,388 15,793 43,595
Machinery and equipment 153,204 69,841 83,363
Enterprise software 7,164 5,878 1,286
Office furniture and equipment 7,581 4,897 2,684
Vehicles 6,028 4,036 1,992
     241,024 100,445 140,579
       
       
    December 31, 2011
    CostAccumulated depreciationNet book value
    
    $$$
Land 6,256 - 6,256
Buildings 47,498 13,044 34,454
Machinery and equipment 135,542 61,325 74,217
Enterprise software 6,818 5,220 1,598
Office furniture and equipment 6,238 4,163 2,075
Vehicles 5,352 3,368 1,984
     207,704 87,120 120,584