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Acquisition (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Oct. 31, 2012
Etherios, Inc
Sep. 30, 2013
Etherios, Inc
Oct. 31, 2012
Maximum
Etherios, Inc
Oct. 31, 2012
Common Stock
Etherios, Inc
Business Acquisition [Line Items]              
Total purchase price       $ 20,437,000      
Cash, including cash in escrow       13,696,000      
Cash acquired       800,000      
Common stock       6,741,000      
Number of shares             715,571
Common stock issued per common share       9.42      
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 $ 103,569,000 $ 86,209,000 $ 86,012,000 $ 17,282,000