Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Oct. 04, 2015	Jul. 05, 2015	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Dec. 31, 2013
Deferred Revenue Arrangement
Extended warranty	$ 47,489	$ 43,299	$ 43,300	$ 43,497	$ 40,052	$ 34,909
Product maintenance and training	37,976		30,500
Customer advances	6,133		8,875
Undelivered elements and other	12,210		8,857
Total deferred revenue and customer advances	$ 103,808		$ 91,532