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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 |  |  |  |  |  |

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