Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018	May 29, 2018
Numerator:
Loss from continuing operations, net of taxes	$ (4.8)	$ (10.7)	$ (4.7)	$ (19.4)
Loss from discontinued operations, net of taxes	0.0	0.0	(2.4)	0.0
Net loss	$ (4.8)	$ (10.7)	$ (7.1)	$ (19.4)
Weighted-average shares outstanding:
Basic and diluted (in shares)	228.3	226.3	227.9	227.3
Net loss per share - basic and dilutive:
Continuing operations (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.02)	$ (0.09)
Discontinued operations (in dollars per share)	0.00	0.00	(0.01)	0.00
Net loss per share - basic and diluted (in dollars per share)	$ (0.02)	$ (0.05)	$ (0.03)	$ (0.09)
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)	9.4	8.4	9.2	9.1
2033 Notes | Convertible Notes
Convertible notes
Interest rate on senior convertible notes	0.625%		0.625%
2024 Notes | Convertible Notes
Convertible notes
Interest rate on senior convertible notes	1.00%		1.00%
Conversion price of debt (in dollars per share)			$ 13.22
2023 Notes | Convertible Notes
Convertible notes
Interest rate on senior convertible notes	1.75%		1.75%		1.75%
Conversion price of debt (in dollars per share)			$ 13.94
Stock options and ESPP
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)	1.5	1.6	1.5	1.6
Restricted Stock Units
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)	7.9	6.8	7.7	7.5