GEOGRAPHIC INFORMATION, PRODUCT GROUPS, MARKET APPLICATIONS AND CUSTOMER CONCENTRATION INFORMATION - Revenues by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 29, 2018	Sep. 30, 2017
Segment Information [Line Items]
Revenues	$ 131,658	$ 155,598
100 Gb/s transmission modules
Segment Information [Line Items]
Revenues	107,386	125,641
40 Gb/s and lower transmission modules
Segment Information [Line Items]
Revenues	$ 24,272	$ 29,957

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration