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
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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) |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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