Discontinued Operations - Loss from Discontinued Operations, Net of Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 25, 2023	Jun. 26, 2022	Jun. 27, 2021
Operating expenses:
Net loss			$ 0.0	$ 94.2	$ (181.2)
Net income from discontinued operations attributable to noncontrolling interest			0.0	0.0	1.4
Net income (loss) from discontinued operations attributable to controlling interest			$ 0.0	94.2	(182.6)
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
Cost of revenue, net					213.3
Gross profit					59.5
Operating expenses:
Research and development					22.3
Sales, general and administrative					29.4
Goodwill impairment	$ 6.9	$ 105.7			112.6
Impairment on assets held for sale					19.5
Gain on disposal or impairment of long-lived assets					(1.6)
Other operating expense					18.7
Operating loss					(141.4)
Non-operating income					(0.3)
Loss before income taxes and loss on sale					(141.1)
Loss on sale					29.1
Loss before income taxes					(170.2)
Income tax expense				$ 3.9	11.0
Net loss					(181.2)
Net income from discontinued operations attributable to noncontrolling interest					1.4
Net income (loss) from discontinued operations attributable to controlling interest					$ (182.6)