GEOGRAPHIC INFORMATION, PRODUCT GROUPS, MARKET APPLICATIONS AND CUSTOMER CONCENTRATION INFORMATION - Additional Information (Details) - customer	3 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Jul. 01, 2017	Jun. 30, 2018
Revenues
Revenue, Major Customer [Line Items]
Number of major customers	4	5
Revenues | Customer A
Revenue, Major Customer [Line Items]
Percentage of revenues	16.00%	17.00%
Revenues | Customer B
Revenue, Major Customer [Line Items]
Percentage of revenues	15.00%	11.00%
Revenues | Customer C
Revenue, Major Customer [Line Items]
Percentage of revenues	14.00%	11.00%
Revenues | Customer D
Revenue, Major Customer [Line Items]
Percentage of revenues	12.00%	10.00%
Revenues | Customer E
Revenue, Major Customer [Line Items]
Percentage of revenues		10.00%
Accounts Receivable
Revenue, Major Customer [Line Items]
Number of major customers	4		2
Accounts Receivable | Customer A
Revenue, Major Customer [Line Items]
Percentage of accounts receivable	16.00%			22.00%
Accounts Receivable | Customer B
Revenue, Major Customer [Line Items]
Percentage of accounts receivable	12.00%			14.00%
Accounts Receivable | Customer C
Revenue, Major Customer [Line Items]
Percentage of accounts receivable	12.00%
Accounts Receivable | Customer D
Revenue, Major Customer [Line Items]
Percentage of accounts receivable	11.00%