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Earnings Per Share - Weighted-Average Potentially Dilutive Securities (Details) - $ / shares shares in Millions	12 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jul. 01, 2017	May 29, 2018	Mar. 22, 2017	Mar. 03, 2017	Feb. 27, 2017	Aug. 17, 2015	Aug. 21, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	0.5	8.9	1.5
Convertible Debt \| Senior Convertible Notes due 2033
Convertible notes
Interest rate on senior convertible notes	0.625%	0.625%							0.625%
Conversion price of debt (usd per share)	$ 11.28							$ 11.28	$ 18.83
Convertible Debt \| Senior Convertible Notes due 2024
Convertible notes
Interest rate on senior convertible notes	1.00%	1.00%			1.00%	1.00%
Conversion price of debt (usd per share)	$ 13.22						$ 13.22
Convertible Debt \| Senior Convertible Notes due 2023
Convertible notes
Interest rate on senior convertible notes	1.75%	1.75%		1.75%
Conversion price of debt (usd per share)	$ 13.94			$ 13.94
Stock options and ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	0.1	1.6	0.9
Full Value Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	0.4	7.3	0.6