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Discontinued Operations - Financial Results (Details) - Lighting Products - Discontinued Operations, Held-for-sale or Disposed of by Sale - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 30, 2018
Dec. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue, net $ 132.5 $ 266.6
Cost of revenue, net 100.8 205.0
Gross profit 31.7 61.6
Research and development 8.9 18.6
Sales, general and administrative 23.2 47.0
Amortization or impairment of acquisition-related intangibles 2.5 7.1
Loss on disposal or impairment of long-lived assets 0.2 0.3
Other operating expense (0.5) 1.4
Operating loss (2.6) (12.8)
Non-operating income (0.1) (0.3)
Loss before income taxes (2.5) (12.5)
Income tax expense (0.2) 0.1
Net loss $ (2.3) $ (12.6)