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Discontinued Operations - Loss from Discontinued Operations, Net of Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 27, 2021
Mar. 28, 2021
Dec. 27, 2020
Sep. 27, 2020
Jun. 28, 2020
Mar. 29, 2020
Dec. 29, 2019
Sep. 29, 2019
Jun. 27, 2021
Jun. 28, 2020
Jun. 30, 2019
Operating expenses:                      
Net (loss) income $ (2.4) $ (41.6) $ (28.4) $ (108.8) $ 5.3 $ (3.7) $ 3.9 $ 1.5 $ (181.2) $ 7.0 $ (256.6)
Net income from discontinued operations attributable to noncontrolling interest                 1.4 1.1 0.0
Net (loss) income from discontinued operations attributable to controlling interest                 (182.6) 5.9 (256.6)
LED Business | Discontinued Operations, Disposed of by Sale                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Revenue, net                 272.8 433.2 541.8
Cost of revenue, net                 213.3 343.4 394.5
Gross profit                 59.5 89.8 147.3
Operating expenses:                      
Research and development                 22.3 32.2 36.8
Sales, general and administrative                 29.4 29.7 31.8
Goodwill impairment     $ 6.9 $ 105.7         112.6 0.0 0.0
Impairment on assets held for sale   19.5             19.5 0.0 0.0
Gain on disposal or impairment of long-lived assets                 (1.6) (0.1) (0.3)
Other operating expense                 18.7 13.3 1.4
Operating loss                 (141.4) 14.7 77.6
Non-operating income                 (0.3) (0.5) (0.1)
(Loss) income before income taxes and loss on sale                 (141.1) 15.2 77.7
Loss on sale                 29.1 0.0 0.0
(Loss) income before income taxes                 (170.2) 15.2 77.7
Income tax expense   $ 4.1             11.0 8.2 17.1
Net (loss) income                 (181.2) 7.0 60.6
Net income from discontinued operations attributable to noncontrolling interest                 1.4 1.1 0.0
Net (loss) income from discontinued operations attributable to controlling interest                 $ (182.6) $ 5.9 $ 60.6