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Discontinued Operations - Loss from Discontinued Operations, Net of Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 27, 2020
Sep. 27, 2020
Dec. 29, 2019
Dec. 27, 2020
Dec. 29, 2019
Operating expenses:          
Net (loss) income $ (28.4)   $ 3.9 $ (137.2) $ 5.4
Net income from discontinued operations attributable to noncontrolling interest 0.3   0.3 0.6 0.3
Net (loss) income from discontinued operations attributable to controlling interest (28.7)   3.6 (137.8) 5.1
Discontinued Operations, Held-for-sale | LED Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenue, net 105.2   119.2 206.3 234.3
Cost of revenue, net 80.4   92.9 163.0 186.3
Gross profit 24.8   26.3 43.3 48.0
Operating expenses:          
Research and development 8.0   8.6 16.4 17.1
Sales, general and administrative 9.0   7.8 16.9 16.4
Goodwill impairment 6.9 $ 105.7 0.0 112.6 0.0
Impairment on assets held for sale 19.5   0.0 19.5 0.0
(Gain) loss on disposal or impairment of long-lived assets (0.5)   0.0 (1.0) 0.2
Other operating expense 7.7   2.9 12.5 4.0
Operating (loss) income (25.8)   7.0 (133.6) 10.3
Non-operating income (0.1)   (0.1) 0.0 (0.1)
(Loss) income before income taxes (25.7)   7.1 (133.6) 10.4
Income tax expense 2.7   3.2 3.6 5.0
Net (loss) income (28.4)   3.9 (137.2) 5.4
Net income from discontinued operations attributable to noncontrolling interest 0.3   0.3 0.6 0.3
Net (loss) income from discontinued operations attributable to controlling interest $ (28.7)   $ 3.6 $ (137.8) $ 5.1