Goodwill impairment	9 Months Ended
Sep. 28, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill Disclosure [Text Block]	7. Goodwill Opta Minerals performed its annual impairment test for goodwill as at September 30, 2013, and recognized a non-cash goodwill impairment loss of $ 3,552 related to one of its reporting units in the third quarter of 2013. Due to increased competition and reduced demand for industrial minerals in markets along the U.S. east coast, the operating profits and cash flows of the reporting unit were lower than expected in the fourth quarter of 2012 and first three quarters of 2013,reflecting reduced sales volumes, price concessions causing lower gross margins, and lower utilization of plant capacity. The fair value of the reporting unit was estimated based on the expected present value of future cash flows using unobservable (level 3) inputs, which included the following assumptions: (i) an estimated cumulative average operating income growth rate from 2014 to 2017 of 25.7%: (ii) a projected long-term annual operating income growth rate of 2.5%: and (iii) a risk-adjusted discount rate of 14.0%. The goodwill associated with the reporting unit was fully deductible for tax purposes. There was no indication of goodwill impairment related to the other reporting units of Opta Minerals based on the testing done as at September 30, 2013..

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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