Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended												12 Months Ended
	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 28, 2014	Jun. 29, 2013	Jun. 30, 2012	Jun. 28, 2014 Restricted stock units	Jun. 29, 2013 Restricted stock units	Jun. 30, 2012 Restricted stock units	Jun. 28, 2014 2033 Notes	Aug. 21, 2013 2033 Notes	Aug. 15, 2013 2033 Notes	Jun. 28, 2014 2026 Notes	Jun. 29, 2013 2026 Notes	Jun. 05, 2006 2026 Notes	Jun. 28, 2014 Stock options and ESPP	Jun. 29, 2013 Stock options and ESPP	Jun. 30, 2012 Stock options and ESPP
Numerator:
(Loss) income from continuing operations, net of tax	$ (25.4)	$ (1.5)	$ 8.8	$ 0.3	$ 91.5	$ (28.0)	$ 3.3	$ (9.8)	$ (17.8)	$ 57.0	$ (26.1)
Loss from discontinued operations, net of tax					1.0		0.8	(1.8)			(29.5)
Net (loss) income	(25.4)	(1.5)	8.8	0.3	92.5	(28.0)	4.1	(11.6)	(17.8)	57.0	(55.6)
Denominator:
Weighted-average number of common shares outstanding-Basic	234.3	234.0	233.0	235.3	236.9	235.9	234.4	232.8	234.2	235.0	230.0
Effect of dilutive securities from stock-based benefit plans (in shares)										4.3
Weighted-average number of common shares outstanding-Diluted	234.3	234.0	235.8	239.6	241.1	235.9	237.1	232.8	234.2	239.3	230.0
Basic net (loss) income per share from:
Continuing operations (in dollars per share)	$ (0.11)	$ (0.01)	$ 0.04	$ 0.00	$ 0.39	$ (0.12)	$ 0.02	$ (0.04)	$ (0.08)	$ 0.24	$ (0.11)
Discontinued operations (in dollars per share)								$ (0.01)			$ (0.13)
Net (loss) income (in dollars per share)	$ (0.11)	$ (0.01)	$ 0.04	$ 0.00	$ 0.39	$ (0.12)	$ 0.02	$ (0.05)	$ (0.08)	$ 0.24	$ (0.24)
Diluted net (loss) income per share from:
Continuing operations (in dollars per share)	$ (0.11)	$ (0.01)	$ 0.04	$ 0.00	$ 0.38	$ (0.12)	$ 0.02	$ (0.04)	$ (0.08)	$ 0.24	$ (0.11)
Discontinued operations (in dollars per share)								$ (0.01)			$ (0.13)
Net (loss) income (in dollars per share)	$ (0.11)	$ (0.01)	$ 0.04	$ 0.00	$ 0.38	$ (0.12)	$ 0.02	$ (0.05)	$ (0.08)	$ 0.24	$ (0.24)
Anti-dilutive securities excluded from computation of earnings per share
Total potentially dilutive securities (in shares)									15.0	4.5	17.6	10.1	2.2	7.7							4.9	2.3	9.9
Interest rate on senior convertible notes (as a percent)															0.625%	0.625%		1.00%		1.00%
Convertible notes
Conversion price of debt (in dollars per share)																	$ 18.83			$ 30.30
Carrying amounts of the liability and equity components:
Principal amount of notes															$ 650.0	$ 650.0		$ 0	$ 0