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Discontinued Operations - Narrative (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale - USD ($)
$ in Millions
12 Months Ended
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