Discontinued Operations - Loss from Discontinued Operations, Net of Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 26, 2021	Dec. 27, 2020
Operating expenses:
Net loss	$ 0.0	$ (28.4)	$ 0.0	$ (137.2)
Net income from discontinued operations attributable to noncontrolling interest	0.0	0.3	0.0	0.6
Net loss from discontinued operations attributable to controlling interest	$ 0.0	(28.7)	$ 0.0	(137.8)
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		105.2		206.3
Cost of revenue, net		80.4		163.0
Gross profit		24.8		43.3
Operating expenses:
Research and development		8.0		16.4
Sales, general and administrative		9.0		16.9
Goodwill impairment		6.9		112.6
Impairment on assets held for sale		19.5		19.5
Gain on disposal or impairment of long-lived assets		(0.5)		(1.0)
Other operating expense		7.7		12.5
Operating loss		(25.8)		(133.6)
Non-operating income		(0.1)		0.0
Loss before income taxes		(25.7)		(133.6)
Income tax expense		2.7		3.6
Net loss		(28.4)		(137.2)
Net income from discontinued operations attributable to noncontrolling interest		0.3		0.6
Net loss from discontinued operations attributable to controlling interest		$ (28.7)		$ (137.8)