Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019	May 29, 2018	Mar. 03, 2017
Numerator:
(Loss) Income from continuing operations	$ (32.8)	$ (4.8)	$ 2.0	$ (4.7)
Loss from discontinued operations, net of taxes	0.0	0.0	0.0	(2.4)
Net (loss) income	$ (32.8)	$ (4.8)	$ 2.0	$ (7.1)
Weighted-average shares outstanding:
Basic (in shares)	230.0	228.3	229.8	227.9
Shares issuable assuming conversion of convertible notes (in shares)	0.0	0.0	3.0	0.0
Effect of dilutive securities from stock-based benefit plans (in shares)	0.0	0.0	3.5	0.0
Diluted (in shares)	230.0	228.3	236.3	227.9
Net (loss) income per share - basic:
Continuing operations (in dollars per share)	$ (0.14)	$ (0.02)	$ 0.01	$ (0.02)
Discontinued operations (in dollars per share)	0	0	0	(0.01)
Net income (loss) per share - basic (in dollars per share)	(0.14)	(0.02)	0.01	(0.03)
Net (loss) income per share - diluted:
Continuing operations (in dollars per share)	(0.14)	(0.02)	0.01	(0.02)
Discontinued operations (in dollars per share)	0	0	0	(0.01)
Net income (loss) per share - diluted (in dollars per share)	$ (0.14)	$ (0.02)	$ 0.01	$ (0.03)
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)	9.8	9.4	0.2	9.2
2024 Notes | Convertible Notes
Convertible notes
Interest rate on senior convertible notes	1.00%		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
Restricted stock units
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)	7.3	7.9	0.2	7.7
Stock options and ESPP
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)	1.2	1.5	0.0	1.5
Shares issuable assuming Convertible Notes
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)	1.3	0.0	0.0	0.0