GEOGRAPHIC INFORMATION, PRODUCT GROUPS AND CUSTOMER CONCENTRATION INFORMATION - Revenues by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Segment Information [Line Items]
Revenues	$ 139,335	$ 153,914	$ 294,933	$ 289,406
100 Gb/s transmission modules
Segment Information [Line Items]
Revenues	105,371	113,835	231,012	211,606
40 Gb/s and lower transmission modules
Segment Information [Line Items]
Revenues	$ 33,964	$ 40,079	$ 63,921	$ 77,800