v2.4.0.8

Goodwill and intangible assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			9 Months Ended	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Sep. 30, 2013 Opta Minerals Inc [Member]	Dec. 28, 2013 Opta Minerals Inc [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 3,552	$ 0	$ 0		$ 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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