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Acquisition (Details) (USD $)
6 Months Ended 0 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Oct. 31, 2012
Etherios [Member]
Oct. 31, 2012
Maximum [Member]
Business Acquisition [Line Items]            
Total purchase price         $ 20,500,000  
Cash, including cash in escrow         13,696,000  
Cash acquired         800,000  
Common stock         6,804,000  
Common stock issued per common share         9.508  
Amount in escrow         2,350,000  
Escrow holdback         300,000  
Escrow cash         2,050,000  
Escrow cash period           18 months
Acquisition Related Costs 200,000          
Goodwill $ 102,473,000 $ 86,209,000 $ 86,114,000 $ 86,012,000 $ 17,120,000