Business Combinations (Schedule of Finite-Lived Intangible Assets Acquired) (Details) - Enterasys Networks, Inc. $ in Thousands	Oct. 31, 2013 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	3 years
Amount	$ 108,900
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	3 years
Amount	$ 45,000
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	3 years
Amount	$ 37,000
Maintenance contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	5 years
Amount	$ 17,000
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	3 years
Amount	$ 2,500
Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	1 year
Amount	$ 7,400