Acquired Developed Technology and Other Intangibles (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Dec. 27, 2014	Jan. 02, 2016	Dec. 27, 2014	Jun. 27, 2015
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles	$ 614.5			$ 614.5		$ 617.1
Accumulated Amortization	(537.7)			(537.7)		(528.3)
Net carrying amount of finite lived intangibles	76.8			76.8		88.8
Net carrying amount of in-process research and development intangibles	0.8			0.8		1.8
Gross Carrying Amount	615.3			615.3		618.9
Net carrying amount of intangibles	77.6			77.6		90.6
Amortization of acquired developed technologies	4.6		$ 9.2	8.9	$ 17.3
Amortization of other intangibles	3.7		4.9	7.5	9.9
Total amortization of intangible assets	8.3		$ 14.1	16.4	$ 27.2
Estimated future amortization expense
Remainder of 2016	15.4			15.4
2017	29.5			29.5
2018	20.9			20.9
2019	9.3			9.3
2020	1.3			1.3
Thereafter	0.4			0.4
Total amortization	76.8			76.8
Acquired developed technology
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles	420.6			420.6		418.9
Accumulated Amortization	(379.3)			(379.3)		(373.6)
Net carrying amount of finite lived intangibles	41.3			41.3		45.3
Transfer from indefinite to finite lived intangible assets		$ 1.8
Useful life		36 months
Customer relationships
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles	174.7			174.7		178.7
Accumulated Amortization	(139.6)			(139.6)		(135.8)
Net carrying amount of finite lived intangibles	35.1			35.1		42.9
Other
Acquired developed technology, customer relationships and other intangibles
Gross carrying amount of finite lived intangibles	19.2			19.2		19.5
Accumulated Amortization	(18.8)			(18.8)		(18.9)
Net carrying amount of finite lived intangibles	$ 0.4			$ 0.4		$ 0.6