v2.4.0.8

Goodwill (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Goodwill Line Items
Goodwill impairment	$ 3,552	$ 0	$ 3,552	$ 0
Opta Minerals Inc [Member]
Goodwill Line Items
Goodwill impairment			$ 3,552
Projected long-term annual operating income growth			2.50%
Fair Value Inputs Discount Rate			14.00%
Estimated Cumulative Average Operating Income Growth			25.70%

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Estimated cumulative average operating income growth

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Projected long-term annual operating income growth

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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