Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Apr. 03, 2021	Mar. 28, 2020	Apr. 03, 2021	Mar. 28, 2020	May 29, 2018	Mar. 03, 2017
Numerator:
Net income (loss)	$ 11.8	$ (32.8)	$ 48.0	$ 2.0
Weighted-average shares outstanding:
Basic (in shares)	228.7	230.0	228.8	229.8
Shares issuable assuming conversion of convertible notes (in shares)	8.5	0.0	2.3	3.0
Effect of dilutive securities from stock-based benefit plans (in shares)	3.0	0.0	2.7	3.5
Diluted (in shares)	240.2	230.0	233.8	236.3
Net income (loss) per share:
Basic (in dollars per share)	$ 0.05	$ (0.14)	$ 0.21	$ 0.01
Dilutive (in dollars per share)	$ 0.05	$ (0.14)	$ 0.21	$ 0.01
Convertible notes
Total potentially dilutive securities (in shares)	0.3	9.8	0.4	0.2
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)			$ 13.94
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)			$ 13.22
Restricted stock units
Convertible notes
Total potentially dilutive securities (in shares)	0.3	7.3	0.4	0.2
Stock options and ESPP
Convertible notes
Total potentially dilutive securities (in shares)	0.0	1.2	0.0	0.0
Shares issuable from Convertible Notes
Convertible notes
Total potentially dilutive securities (in shares)	0.0	1.3	0.0	0.0