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Business Combinations (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 14, 2017
Mar. 07, 2017
Oct. 28, 2016
Sep. 30, 2017
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Business Acquisition [Line Items]              
Acquisition-related expenses         $ 4,244   $ 2,321
Avaya Networking              
Business Acquisition [Line Items]              
Asset purchase agreement closing date Jul. 14, 2017            
Business acquisition, purchase price   $ 100,000          
Business acquisition, deposits amount           $ 10,200  
Business acquisition, provisional consideration   $ 79,800          
Avaya Networking | Acquisition and Integration Costs              
Business Acquisition [Line Items]              
Acquisition-related expenses       $ 5,100 2,900    
Avaya Networking | In-Process Research and Development              
Business Acquisition [Line Items]              
Fair value of indefinite lived intangibles       $ 2,300 $ 2,300    
Zebra Technologies Corporation              
Business Acquisition [Line Items]              
Net cash consideration     $ 49,500