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Goodwill and Other Identifiable Intangible Assets, Net Goodwill (Details) (USD $)
0 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2014
industry
Jun. 30, 2013
Sep. 30, 2013
Goodwill [Roll Forward]        
Beginning balance $ 104,329,000 $ 103,569,000 $ 86,209,000  
Acquisition of Etherios, Inc.   0 17,120,000  
Foreign currency translation adjustment   760,000 (718,000)  
Ending balance 104,329,000 104,329,000 102,611,000  
Goodwill [Line Items]        
Market capitalization 235,800,000 235,800,000    
Carrying value $ 273,352,000 $ 273,352,000   $ 274,585,000
Control premium percent 35.00%      
Percent fair value in excess of carrying value of goodwill 16.00% 16.00%    
Target companies equity benchmark 50.00% 50.00%    
Number of industries encompasses similar products 3 3    
Minimum [Member]
       
Goodwill [Line Items]        
Control premium percent 30.00%      
Maximum [Member]
       
Goodwill [Line Items]        
Control premium percent 40.00%