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BUSINESS COMBINATION (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 19, 2021
Apr. 03, 2021
Jan. 02, 2021
Mar. 28, 2020
Dec. 28, 2019
Apr. 03, 2021
Mar. 28, 2020
Business Acquisition [Line Items]              
Net loss contributed   $ (71,320,000) $ (48,363,000) $ (11,888,000) $ (13,477,000) $ (119,683,000) $ (25,365,000)
Uniqarta              
Business Acquisition [Line Items]              
Net loss contributed   100,000          
Uniqarta              
Business Acquisition [Line Items]              
Cash purchase price $ 26,500,000            
Amount held in escrow   3,600,000       3,600,000  
Goodwill deductible for income tax purposes 0            
Expenses incurred related to the acquisition   $ 1,400,000       $ 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 $ 9,000,000.0            
Uniqarta | Minimum              
Business Acquisition [Line Items]              
Amount held in escrow, period from acquisition date 3 months            
Uniqarta | Maximum              
Business Acquisition [Line Items]              
Amount held in escrow, period from acquisition date 18 months