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Activity Related to Accrued Warranties (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Product Warranty Liability [Line Items]
Beginning Balance	$ 2,359	$ 2,365
Provision for warranty expense	873	805
Warranty expired	(1,084)	(700)
Ending Balance	$ 2,148	$ 2,470

- 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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