Extended Product Warranty Included in Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 46,499	$ 43,300
Deferral of new extended warranty revenue	6,827	4,204
Recognition of extended warranty deferred revenue	(7,211)	(6,800)
Balance at end of period	$ 46,115	$ 40,704