Extended Product Warranty Included in Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jul. 05, 2015	Jul. 03, 2016	Jul. 05, 2015
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 46,115	$ 40,704	$ 46,499	$ 43,300
Acquisition		699		699
Deferral of new extended warranty revenue	8,898	8,172	15,725	12,376
Recognition of extended warranty deferred revenue	(7,290)	(6,276)	(14,501)	(13,076)
Balance at end of period	$ 47,723	$ 43,299	$ 47,723	$ 43,299