Business Combinations (Schedule of Identifiable Intangible Assets Acquired as Part of Acquisition) (Details) - USD ($) $ in Thousands	Oct. 27, 2017	Jul. 14, 2017
Data Center Business
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 32,800
Data Center Business | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 26,000
Data Center Business | Developed technology | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	2 years
Data Center Business | Developed technology | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	4 years
Data Center Business | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	4 years
Amount	$ 5,400
Data Center Business | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	4 years
Amount	$ 1,400
Campus Fabric Business
Acquired Finite-Lived Intangible Assets [Line Items]
Amount		$ 41,300
Campus Fabric Business | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Amount		$ 31,800
Campus Fabric Business | Developed technology | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)		2 years
Campus Fabric Business | Developed technology | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)		4 years
Campus Fabric Business | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)		4 years
Amount		$ 5,100
Campus Fabric Business | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Amount		$ 2,600
Campus Fabric Business | Trade names | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)		4 years
Campus Fabric Business | Trade names | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)		5 years
Campus Fabric Business | Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)		1 year
Amount		$ 1,800