Acquired Developed Technology and Other Intangibles (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Jun. 30, 2018
Acquired developed technology, customer relationships and other intangibles
Gross Carrying Amount	$ 698.1		$ 698.1		$ 675.0
Accumulated Amortization	(475.2)		(475.2)		(439.9)
Net	222.9		222.9		235.1
Cost of revenues	8.5	$ 4.1	17.9	$ 8.2
Operating expenses	10.4	3.4	20.2	6.5
Total amortization of intangible assets	18.9	$ 7.5	38.1	$ 14.7
Estimated future amortization expense
Remainder of 2019	32.8		32.8
2020	62.9		62.9
2021	58.6		58.6
2022	32.3		32.3
2023	18.5		18.5
Thereafter	8.8		8.8
Total amortization	213.9		213.9
In-process research and development
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	9.0		9.0		9.0
Acquired developed technology
Acquired developed technology, customer relationships and other intangibles
Gross Carrying Amount	465.4		465.4		447.8
Accumulated Amortization	(346.8)		(346.8)		(326.4)
Net	118.6		118.6		121.4
Customer relationships
Acquired developed technology, customer relationships and other intangibles
Gross Carrying Amount	187.1		187.1		175.4
Accumulated Amortization	(113.0)		(113.0)		(97.1)
Net	74.1		74.1		78.3
Other
Acquired developed technology, customer relationships and other intangibles
Gross Carrying Amount	36.6		36.6		42.8
Accumulated Amortization	(15.4)		(15.4)		(16.4)
Net	$ 21.2		$ 21.2		$ 26.4