Quarterly Financial Information (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 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
Quarterly consolidated statements of operations
Net revenue	$ 448.6	$ 418.0	$ 447.6	$ 429.0	$ 421.3	$ 405.3	$ 429.4	$ 420.9	$ 1,743.2	$ 1,676.9	$ 1,662.4
Cost of sales	228.2	222.3	232.8	232.4	229.0	233.0	225.8	231.2	915.7	919.0	898.3
Amortization of acquired technologies	10.9	11.0	9.9	11.4	14.6	17.0	14.6	17.1	43.2	63.3	58.6
Gross profit	209.5	184.7	204.9	185.2	177.7	155.3	189.0	172.6	784.3	694.6	705.5
Operating expenses:
Research and development	80.0	74.1	72.3	69.6	67.6	65.8	63.5	61.6	296.0	258.5	244.0
Selling, general and administrative	120.9	113.4	109.0	107.1	111.9	107.3	105.4	104.7	450.4	429.3	427.0
Amortization of other intangibles	5.1	5.2	2.8	2.7	3.9	3.1	2.2	3.5	15.8	12.7	21.7
Restructuring and related charges	20.0	3.6	1.0	(0.8)	12.9	0.4	3.0	2.7	23.8	19.0	12.4
Total operating expenses	226.0	196.3	185.1	178.6	196.3	176.6	174.1	172.5	786.0	719.5	705.1
(Loss) income from operations	(16.5)	(11.6)	19.8	6.6	(18.6)	(21.3)	14.9	0.1	(1.7)	(24.9)	0.4
Interest and other income (expense), net	0.1	0.6	0.4	(0.6)	(0.4)	(0.9)	(2.4)	(0.4)	0.5	(4.1)	12.8
Interest expense	(8.4)	(7.7)	(8.4)	(5.2)	(2.5)	(4.2)	(5.1)	(6.1)	(29.7)	(17.9)	(27.3)
Loss from continuing operations before income taxes	(24.8)	(18.7)	11.8	0.8	(21.5)	(26.4)	7.4	(6.4)	(30.9)	(46.9)	(14.1)
(Loss) income from continuing operations, net of tax	0.6	(17.2)	3.0	0.5	(113.0)	1.6	4.1	3.4	(13.1)	(103.9)	12.0
(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)
Basic and diluted net loss 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)
Shares used in per share calculation:
Basic (in shares)	234.3	234.0	233.0	235.3	236.9	235.9	234.4	232.8	234.2	235.0	230.0
Diluted net income (loss) per share from: (in shares)	234.3	234.0	235.8	239.6	241.1	235.9	237.1	232.8	234.2	239.3	230.0