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Discontinued Operations - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 18, 2020
Dec. 27, 2020
Sep. 27, 2020
Dec. 29, 2019
Dec. 27, 2020
Dec. 29, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Term of certain silicon carbide materials and fabrication services 4 years          
Discontinued Operations, Held-for-sale | LED Business            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash received from divestiture $ 50,000,000          
Unsecured promissory note issued to parent in disposition $ 125,000,000          
Goodwill impairment   $ 6,900,000 $ 105,700,000 $ 0 $ 112,600,000 $ 0
Impairment on assets held for sale   $ 19,500,000   $ 0 $ 19,500,000 $ 0
Discontinued Operations, Held-for-sale | LED Business | Purchase Price Note | Unsecured Promissory Note | LIBOR            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Basis spread on variable rate of debt instrument (as a percent) 3.00%          
Discontinued Operations, Held-for-sale | LED Business | Maximum            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Potential earn-out payment $ 125,000,000          
Term of real estate license agreement 24 months