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Employee Stock Purchase Plan (Tables)
3 Months Ended
Dec. 31, 2014
Text Block [Abstract]  
Weighted Average Assumptions of Employee Stock Purchase Plan

The following are the weighted average assumptions used for each respective period:

 

     Three Months Ended
December 31,
 
     2013     2014  

Dividend yield

     0.0     0.0

Risk-free interest rate

     0.1     0.1

Volatility

     41.3     30.0

Expected life

     six months        six months