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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Aug. 21, 2013
Numerator:
Net (loss) income	$ (13.2)	$ (1.5)	$ (48.0)	$ 7.6
Denominator:
Basic	233.2	234.0	232.1	234.1
Effect of dilutive securities from stock-based benefit plans				3.6
Diluted	233.2	234.0	232.1	237.7
Basic net (loss) income per share from:
Basic	$ (0.06)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.21)us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic
Diluted net (loss) income per share from:
Diluted	$ (0.06)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.21)us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	14.1	14.8	14.4	4.0
0.625% Senior Convertible Debentures due 2033 ("notes")
Convertible notes
Interest rate on senior convertible notes (as a percent)	0.625%		0.625%		0.625%
Conversion price of debt (in dollars per share)	$ 18.83		$ 18.83
Employee stock options and ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	3.7	4.6	3.8	1.1
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	10.4	10.2	10.6	2.9