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Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Oct. 05, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]        
Goodwill   $ 109,448 $ 100,183 $ 101,484
Bluenica Corporation        
Business Acquisition [Line Items]        
Cash $ 2,888      
Purchase price payable upon completion of diligence matters 115      
Fair value of contingent consideration on acquired business 10,400      
Total purchase price consideration 13,403      
Fair value of net tangible assets acquired 129      
Goodwill 10,985      
Deferred tax liabilities, net (611)      
Total assets acquired and liabilities assumed 13,403      
Purchased and Core Technology | Bluenica Corporation        
Business Acquisition [Line Items]        
Fair value of identifiable intangible assets acquired 2,000      
Customer Relationships | Bluenica Corporation        
Business Acquisition [Line Items]        
Fair value of identifiable intangible assets acquired $ 900