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BUSINESS COMBINATION (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 19, 2021
Jul. 03, 2021
Apr. 03, 2021
Jan. 02, 2021
Jun. 27, 2020
Mar. 28, 2020
Dec. 28, 2019
Jul. 03, 2021
Jun. 27, 2020
Business Acquisition [Line Items]                  
Net loss contributed   $ (113,766,000) $ (71,320,000) $ (48,363,000) $ (11,151,000) $ (11,888,000) $ (13,477,000) $ (233,450,000) $ (36,516,000)
Uniqarta                  
Business Acquisition [Line Items]                  
Net loss contributed   100,000           200,000  
Uniqarta                  
Business Acquisition [Line Items]                  
Cash purchase price $ 26,500,000                
Amount held in escrow   3,500,000           3,500,000  
Goodwill deductible for income tax purposes 0                
Expenses incurred related to the acquisition   $ 0           $ 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 | Maximum                  
Business Acquisition [Line Items]                  
Amount held in escrow, period from acquisition date 18 months