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Acquisition Of Businesses (Details) (USD $)
Sep. 30, 2012
Jul. 20, 2012
Sep. 30, 2011
Business Acquisition [Line Items]      
Recognized liability of additional earn-out payment $ 13,100,000 $ 13,100,000 $ 6,850,000
Goodwill on acquisition 13,584,000   51,532,000
Umbian, Inc [Member]
     
Business Acquisition [Line Items]      
Percentage of outstanding shares acquired   100.00%  
Total purchase price of acquisition   5,600,000  
Additional potential earn-out payments based on the achievement of certain milestones   35,400,000  
Developed Technology [Member]
     
Business Acquisition [Line Items]      
Intangible assets   $ 7,300,000