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Discontinued Operations - Narrative (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 29, 2019
Dec. 29, 2019
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  
Transmission Service Agreement      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Administrative fees $ 2.6 5.6  
LED Supply Agreement      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue 3.6 6.5  
Contract liability $ 11.6 11.6  
Accounts Receivable, Net | Transmission Service Agreement      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Administrative fees   0.8  
Accounts Receivable, Net | LED Supply Agreement      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue   $ 1.8