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Activity Related to Accrued Warranties (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Product Warranty Liability [Line Items]
Beginning Balance	$ 2,364	$ 2,359
Provision for warranty expense	2,697	2,639
Warranty expired	(2,604)	(2,571)
Ending Balance	$ 2,457	$ 2,427

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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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