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Discontinued Operations - Narrative (Details) - USD ($)		3 Months Ended			6 Months Ended
Discontinued Operations - Narrative (Details) - USD ($)	Mar. 01, 2021	Dec. 26, 2021	Dec. 27, 2020	Sep. 27, 2020	Dec. 26, 2021	Dec. 27, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Costs of selling business						$ 27,400,000
Term of certain silicon carbide materials and fabrication services	4 years
Non-operating income		$ 100,000	$ 0		$ 900,000	0
Discontinued Operations, Disposed of by 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
Loss on sale						(29,100,000)
Goodwill impairment			$ 6,900,000			$ 112,600,000
Supply Agreement liability	$ 31,000,000	14,000,000			14,000,000
Non-operating income		100,000			900,000
Other assets		2,200,000			2,200,000
Discontinued Operations, Disposed of by 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, Disposed of by Sale \| LED Business \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Potential earn-out payment	$ 2,500,000
Discontinued Operations, Disposed of by 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
Discontinued Operations, Disposed of by Sale \| LED Business, Real Estate License Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Administrative fees		900,000			1,800,000
Discontinued Operations, Disposed of by Sale \| LED Business, Real Estate License Agreement \| Accounts Receivable, Net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Administrative fees					300,000
Discontinued Operations, Disposed of by Sale \| LED Business, Transition Services Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Administrative fees		$ 2,400,000			5,300,000
Discontinued Operations, Disposed of by Sale \| LED Business, Transition Services Agreement \| Accounts Receivable, Net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Administrative fees					$ 700,000
Discontinued Operations, Held-for-sale \| LED Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment				$ 105,700,000