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Goodwill (Details) (USD $)	3 Months Ended
	Mar. 30, 2013 item	Dec. 29, 2012	Mar. 31, 2012
Goodwill
Number of reporting units	1
Goodwill impairment	$ 0	$ 71,400,000	$ 0
Changes in the carrying amount of goodwill
Balance at the beginning of the period	70,765,000
Goodwill, gross	147,400,000	142,658,000
Accumulated impairment losses	(71,893,000)	(71,893,000)
Goodwill adjustments related to acquisition	5,565,000
Effect of foreign currency translation	(823,000)
Balance at the end of the period	$ 75,507,000	$ 70,765,000

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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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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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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