v2.4.0.8

Capital stock (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 02, 2010 | Jun. 11, 2010 | Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options |  |  | 2,172,811 |  |
Share Based Compensation Arrangement By Share Based Payment Award Expiration Period |  |  | 10 years | 6 years |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  | ratably |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 4.44 | $ 3.41 | $ 4.36
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award |  |  | Black-Scholes |  |
Share Based Compensation Estimated Percentage Of Options To Be Vested |  |  | 85.00% |  |
Allocated Share-based Compensation Expense |  |  | $ 3,255 | $ 2,753 | $ 2,090
Tax Benefit from Stock Options Exercised |  |  | 170 | 12 | 86
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  | 2 years 2 months 12 days |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options |  |  | 8,032 |  |
Exercise of options |  |  | 2,013 | 241 | 529
Proceeds from issuance of common shares |  |  | 2,562 | 787 | 1,155
Class of Warrant or Right, Date from which Warrants or Rights Exercisable | Feb. 05, 2010 | Jun. 11, 2010 |  |  |
Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights | 250,000 | 600,000 |  |  |
Class Of Warrant Or Right Exercise Price Of Warrants Or Rights | $ 3.25 | $ 5.11 |  |  |
Warrants and Rights Outstanding |  |  | 2,163 |  |
Warrants And Rights Exercised |  |  | 0 |  |
Two Thousand Two Plan [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  | 7,500,000 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options |  |  | 867,031 |  |
Two Thousand Thirteen Stock Incentive Plan [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Stock Incentive Plan Initiation Date |  |  | May 28, 2013 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options |  |  | 1,250,000 |  |
Minimum [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 |  |  | 1 year | 1 year |
Maximum [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 |  |  | 5 years | 5 years |
Employee Share Purchase Plan Compensation Grants [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options |  |  | 1,363,771 |  |
Stock Issued During Period, Shares, Employee Stock Ownership Plan |  |  | 80,215 | 111,078 | 119,028
Proceeds from issuance of common shares |  |  | 549 | 546 | 626
Opta Minerals Inc [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 485 | $ 501 | $ 354

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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