BALANCE SHEET COMPONENTS (Narrative) (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018
Restructuring Cost and Reserve [Line Items]
Severance	$ 1,500	$ 1,415

Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment.

No definition available.

Name:	us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant