Discontinued Operations - Loss from Discontinued Operations, Net of Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
Operating expenses:
Non-operating expense, net	$ 0.8	$ 0.0
Net loss	0.0	(108.8)
Net income from discontinued operations attributable to noncontrolling interest	0.0	0.3
Net loss from discontinued operations attributable to controlling interest	0.0	(109.1)
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		101.1
Cost of revenue, net		82.6
Gross profit		18.5
Operating expenses:
Research and development		8.4
Sales, general and administrative		7.9
Goodwill impairment		105.7
Gain on disposal or impairment of long-lived assets		(0.5)
Other operating expense		4.8
Operating loss		(107.8)
Non-operating expense, net	$ 0.8	0.1
Loss before income taxes		(107.9)
Income tax expense		0.9
Net loss		(108.8)
Net income from discontinued operations attributable to noncontrolling interest		0.3
Net loss from discontinued operations attributable to controlling interest		$ (109.1)