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Acquisitions - Preliminary identified intangible assets acquired (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 15, 2018	Aug. 09, 2017	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Business Acquisition [Line Items]
Goodwill			$ 336.3	$ 151.6	$ 152.1
AW
Business Acquisition [Line Items]
Tangible assets acquired	$ 65.5
Intangible assets acquired			232.0
Goodwill	172.3
Total consideration transferred	469.8
AW | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired	113.5
AW | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired	75.0
AW | Trade names
Business Acquisition [Line Items]
Intangible assets acquired	28.0
AW | In-process research and development
Business Acquisition [Line Items]
Intangible assets acquired	9.0
AW | Customer backlog
Business Acquisition [Line Items]
Intangible assets acquired	$ 6.5
Trilithic
Business Acquisition [Line Items]
Tangible assets acquired		$ 11.8
Intangible assets acquired			$ 26.8
Goodwill		17.8
Total consideration transferred		56.4
Trilithic | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired		15.5
Trilithic | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired		11.0
Trilithic | Other
Business Acquisition [Line Items]
Intangible assets acquired		$ 0.3

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