EQUITY INVESTMENTS (Details) - USD ($) $ in Thousands	Mar. 28, 2020		Sep. 28, 2019		Jan. 30, 2019
Equity Method Investments [Abstract]
Non-marketable equity securities(1)	$ 6,278	[1]	$ 5,000	[1]	$ 5,000
Equity method investments	1,149		1,250
Equity investments	$ 7,427		$ 6,250

[1] On January 30, 2019, the Company made a $5.0 million investment in one of our collaborative partners, over which the Company does not have significant influence. During the three and six months ended March 28, 2020, there was no impairment or adjustment to the observable price.