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Accrued Warranties (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
Product Warranty Liability [Line Items]
Beginning Balance	$ 2,365	$ 1,857
Provision for warranty expense	2,231	2,033
Warranty expired	(2,350)	(1,717)
Ending Balance	$ 2,246	$ 2,173

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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