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Discontinued Operations - Loss from Discontinued Operations, Net of Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 28, 2021
Dec. 27, 2020
Sep. 27, 2020
Mar. 29, 2020
Mar. 28, 2021
Mar. 29, 2020
Operating expenses:            
Net (loss) income $ (41.6)     $ (3.7) $ (178.8) $ 1.7
Net income from discontinued operations attributable to noncontrolling interest 0.8     0.2 1.4 0.5
Net (loss) income from discontinued operations attributable to controlling interest (42.4)     (3.9) (180.2) 1.2
Discontinued Operations, Disposed of by Sale | LED Business            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Revenue, net 66.5     101.7    
Cost of revenue, net 50.3     81.5    
Gross profit 16.2     20.2    
Operating expenses:            
Research and development 5.9     8.1    
Sales, general and administrative 12.5     8.1    
Goodwill impairment 0.0     0.0    
Impairment on assets held for sale 0.0     0.0    
(Gain) loss on disposal or impairment of long-lived assets (0.6)     0.2    
Other operating expense 6.2     5.6    
Operating (loss) income (7.8)     (1.8)    
Non-operating income (0.3)     (0.2)    
(Loss) income before income taxes and loss on sale (7.5)     (1.6)    
Loss on sale 26.3     0.0 26.3  
(Loss) income before income taxes (33.8)     (1.6)    
Income tax expense 7.8     2.1    
Net (loss) income (41.6)     (3.7)    
Net income from discontinued operations attributable to noncontrolling interest 0.8     0.2    
Net (loss) income from discontinued operations attributable to controlling interest $ (42.4)     $ (3.9)    
Discontinued Operations, Held-for-sale | LED Business            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Revenue, net         272.8 336.0
Cost of revenue, net         213.3 267.8
Gross profit         59.5 68.2
Operating expenses:            
Research and development         22.3 25.2
Sales, general and administrative         29.4 24.5
Goodwill impairment   $ 6.9 $ 105.7   112.6 0.0
Impairment on assets held for sale   $ 19.5     19.5 0.0
(Gain) loss on disposal or impairment of long-lived assets         (1.6) 0.4
Other operating expense         18.7 9.6
Operating (loss) income         (141.4) 8.5
Non-operating income         (0.3) (0.3)
(Loss) income before income taxes and loss on sale         (141.1) 8.8
Loss on sale           0.0
(Loss) income before income taxes         (167.4) 8.8
Income tax expense         11.4 7.1
Net (loss) income         (178.8) 1.7
Net income from discontinued operations attributable to noncontrolling interest         1.4 0.5
Net (loss) income from discontinued operations attributable to controlling interest         $ (180.2) $ 1.2