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Discontinued Operations - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 18, 2020 | Jun. 28, 2020 | Jun. 30, 2019 | Jun. 24, 2018 | May 13, 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 |  |  |  |
Lighting Products | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Aggregate net proceeds from sale of business unit |  |  |  |  | $ 219,000,000.0
Loss on sale |  |  | $ 66,200,000 | $ 0 |
Transmission Service Agreement | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Administrative fees |  | $ 10,500,000 | 1,600,000 |  |
Transmission Service Agreement | Discontinued Operations, Held-for-sale or Disposed of by Sale | Sales, general and administrative |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Accrued administrative fees |  | 1,600,000 | 1,600,000 |  |
LED Supply Agreement | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Revenue |  | 12,000,000.0 | 2,100,000 |  |
Accounts receivable, net |  | 700,000 |  |  |
Contract liability |  | 9,900,000 | 13,400,000 |  |
LED Business | Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Accounts receivable, net |  | $ 41,600,000 | $ 59,700,000 |  |
Cash received from divestiture | $ 50,000,000 |  |  |  |
Unsecured promissory note issued to parent in disposition | $ 125,000,000 |  |  |  |
LED Business | Discontinued Operations, Held-for-sale | Purchase Price Note | Unsecured Debt | London Interbank Offered Rate (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% |  |  |  |
LED Business | Discontinued Operations, Held-for-sale | 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 |  |  |  |

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