Acquired Developed Technology and Other Intangibles (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Jun. 29, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 671.7		$ 671.7		$ 666.8
Accumulated Amortization	(492.4)		(492.4)		(455.2)
Net	179.3		179.3		211.6
Cost of revenues	8.4	$ 8.5	16.8	$ 17.9
Operating expenses	8.8	10.4	17.5	20.2
Total amortization of intangible assets	17.2	$ 18.9	34.3	$ 38.1
Estimated future amortization expense
Remainder of 2020	34.0		34.0
2021	64.4		64.4
2022	37.7		37.7
2023	23.8		23.8
2024	9.2		9.2
Thereafter	10.2		10.2
Total amortization	179.3		179.3
Acquired developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	439.7		439.7		437.0
Accumulated Amortization	(329.4)		(329.4)		(311.1)
Net	110.3		110.3		125.9
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	195.3		195.3		193.7
Accumulated Amortization	(141.9)		(141.9)		(126.3)
Net	53.4		53.4		67.4
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	36.7		36.7		36.1
Accumulated Amortization	(21.1)		(21.1)		(17.8)
Net	$ 15.6		$ 15.6		$ 18.3