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Business Combinations (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 31, 2013
Jun. 30, 2014
Business Acquisition [Line Items]    
Purchase price paid in acquisition   $ 180,000
Enterasys Networks, Inc.    
Business Acquisition [Line Items]    
Purchase price paid in acquisition $ 180,000  
Estimated Useful Life (in years) 3 years  
Increase in revenue   227,700
Increase in operating income   13,500
Enterasys Networks, Inc. | Acquisition and Integration Costs    
Business Acquisition [Line Items]    
Acquisition-related expenses   $ 6,000
Enterasys Networks, Inc. | In Process Research and Development    
Business Acquisition [Line Items]    
Fair value of indefinite lived intangibles $ 3,000  
Enterasys Networks, Inc. | Developed technology    
Business Acquisition [Line Items]    
Estimated Useful Life (in years) 3 years