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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 27, 2014	Dec. 28, 2013	Aug. 21, 2013
Numerator:
Net (loss) income	$ (25.1)	$ 8.8	$ (34.8)	$ 9.1
Denominator:
Basic	232.1	233.0	231.5	234.2
Effect of dilutive securities from stock-based benefit plans		2.8		3.6
Diluted	232.1	235.8	231.5	237.8
Basic net (loss) income per share from:
Basic	$ (0.11)us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ (0.15)us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic
Diluted net (loss) income per share from:
Diluted	$ (0.11)us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ (0.15)us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	14.9	2.1	14.6	2.5
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	3.8	1.7	3.8	1.1
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	11.1	0.4	10.8	1.4