Geographic Information, Product Groups and Customer Concentration - Revenues by Product Group (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jul. 01, 2017	Jul. 02, 2016	Jun. 27, 2015
Revenue from External Customer [Line Items]
Revenues	$ 149,380	$ 162,182	$ 153,914	$ 135,492	$ 125,185	$ 101,050	$ 94,129	$ 87,550	$ 600,968	$ 407,914	$ 341,276
100 Gb/s transmission modules
Revenue from External Customer [Line Items]
Revenues									457,975	228,619	119,276
40 Gb/s and lower transmission modules
Revenue from External Customer [Line Items]
Revenues									142,993	179,295	212,636
Industrial and consumer
Revenue from External Customer [Line Items]
Revenues									$ 0	$ 0	$ 9,364