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Share-based Payments (Tables)
 6 Months Ended
Sep. 30, 2015
Share-based Payments [Abstract]  
Summary of Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted
The assumptions used to derive the weighted average fair value of the stock options granted were:

  
Six Months Ended
September 30,
 
  
2015
  
2014
 
Weighted average risk free interest rate
  
1.73
%
  
1.75
%
Weighted average expected holding period (years)
  
5.76
   
5.01
 
Weighted average expected volatility
  
46.84
%
  
46.02
%
Weighted average expected dividend yield
  
-
   
-
 
Weighted average fair value of options granted
 
$
14.13
  
$
9.65
 
 
Summary of stock option transactions
The following is a summary of stock option transactions for the six months ended September 30, 2015:

  
Number of
Shares
  
Weighted Average
Exercise Price
 
Outstanding at March 31, 2015
  
1,389,254
  
$
9.97
 
Granted
  
110,122
  
$
31.13
 
Exercised
  
(294,757
)
 
$
10.03
 
Cancelled
  
-
  
$
-
 
Outstanding at September 30, 2015
  
1,204,619
  
$
11.89
 
Schedule of restricted stock units activity
The following is a summary of non-vested restricted stock for the six months ended September 30, 2015:

  
Number of
Shares
  
Weighted Average
Grant Date Fair
Value
 
Non-vested stock at March 31, 2015
  
181,443
  
$
16.84
 
Granted
  
39,900
  
$
31.13
 
Vested
  
(75,519
)
 
$
15.34
 
Cancelled
  
-
  
$
-
 
Non-vested stock at September 30, 2015
  
145,824
  
$
21.53