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BUSINESS COMBINATION (Narrative) (Details) - USD ($)
 12 Months Ended
Jan. 19, 2021
Oct. 02, 2021
Oct. 03, 2020
Sep. 28, 2019
Business Acquisition [Line Items]        
Net loss contributed   $ (367,161,000) $ (52,300,000) $ (11,653,000)
Uniqarta        
Business Acquisition [Line Items]        
Net loss contributed   200,000    
Uniqarta        
Business Acquisition [Line Items]        
Cash purchase price $ 26,500,000      
Amount held in escrow   3,500,000    
Goodwill deductible for income tax purposes 0      
Expenses incurred related to the acquisition   $ 1,700,000    
Uniqarta | Other Intangible Assets        
Business Acquisition [Line Items]        
Finite-lived intangible assets acquired $ 2,200,000      
Estimated useful life 6 years      
Uniqarta | IPR&D        
Business Acquisition [Line Items]        
Indefinite-lived intangible assets acquired $ 9,000,000      
Uniqarta | Maximum        
Business Acquisition [Line Items]        
Amount held in escrow, period from acquisition date 18 months