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Employee Stock Purchase Plan (Tables)
3 Months Ended
Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [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,

 

 

 

2014

 

 

2015

 

Dividend yield

 

 

0.0%

 

 

 

0.0%

 

Risk-free interest rate

 

 

0.1%

 

 

 

0.1%

 

Volatility

 

 

30.0%

 

 

 

47.6%

 

Expected life

 

Six months

 

 

Six months