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Share-based Payments (Details) - USD ($)
6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Stock Options [Member]    
Summary of Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted [Abstract]    
Weighted average risk free interest rate 1.38% 1.73%
Weighted average expected holding period 5 years 10 months 2 days 5 years 9 months 4 days
Weighted average expected volatility 47.42% 46.84%
Weighted average expected dividend yield 0.00% 0.00%
Weighted average fair value of options granted (in dollars per share) $ 13.07 $ 14.13
Number of Shares [Roll Forward]    
Outstanding at beginning of period (in shares) 984,066  
Granted (in shares) 184,000 110,122
Exercised (in shares) (83,133)  
Cancelled (in shares) 0  
Outstanding at end of period (in shares) 1,084,933  
Weighted Average Exercise Price [Roll Forward]    
Outstanding at beginning of period (in dollars per share) $ 11.98  
Granted (in dollars per share) 28.67  
Exercised (in dollars per share) 12.60  
Cancelled (in dollars per share) 0  
Outstanding at end of period (in dollars per share) $ 14.76  
Number of stock options unvested (in shares) 283,469  
Weighted average exercise price of stock options unvested (in dollars per share) $ 13.02  
Total unrecognized compensation expense $ 3,418,000  
Weighted average vesting period over which compensation expense is expected to be recognized 2 years 3 months 18 days  
Restricted Stock (RSUs) [Member]    
Weighted Average Exercise Price [Roll Forward]    
Weighted average vesting period over which compensation expense is expected to be recognized 1 year 10 months 24 days  
Number of Shares [Roll Forward]    
Non-vested at beginning of period (in shares) 153,527  
Granted (in shares) 42,876 39,900
Vested (in shares) (86,854)  
Cancelled (in shares) 0  
Non-vested at end of period (in shares) 109,549  
Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested at beginning of period (in dollars per share) $ 22.28  
Granted (in dollars per share) 28.54  
Vested (in dollars per share) 17.67  
Cancelled (in dollars per share) 0  
Non-vested at end of period (in dollars per share) $ 28.39  
Total unrecognized compensation expense $ 2,648,000  
Estimated fair value of awards granted $ 1,224,000 $ 1,242,000