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Discontinued Operations - Narrative (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale - USD ($) $ in Millions | 12 Months Ended |
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Jun. 28, 2020 | Jun. 30, 2019 | Jun. 24, 2018 | May 13, 2019
Lighting Products |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Aggregate net proceeds from sale of business unit |  |  |  | $ 219.0
Loss on sale |  | $ 66.2 | $ 0.0 |
Transmission Service Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Administrative fees | $ 10.5 | 1.6 |  |
Transmission Service Agreement | Sales, general and administrative |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Accrued administrative fees | 1.6 | 1.6 |  |
LED Supply Agreement |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue | 12.0 | 2.1 |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | 0.7 | 0.0 |  |
Contract liability | $ 9.9 | $ 13.4 |  |

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