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Employee Stock Purchase Plan (Tables)
12 Months Ended
Sep. 30, 2014
Text Block [Abstract]  
Weighted Average Assumptions of Employee Stock Purchase Plan

The following are the weighted-average assumptions used for the fiscal years ended September 30,

 

     2012     2013     2014  

Dividend yield

     0.0     0.0     0.0

Risk-free interest rate

     0.1     0.1     0.1

Volatility

     51.8     54.8     39.6

Expected life

     Six months        Six months        Six months