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Share-based Payments - Stock Options Activity (Details) - Stock Options [Member] - USD ($)
 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
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 1.90% 1.38%
Weighted average expected holding period 5 years 9 months 25 days 5 years 10 months 2 days
Weighted average expected volatility 47.36% 47.42%
Weighted average expected dividend yield 0.00% 0.00%
Weighted average fair value of options granted (in dollars per share) $ 12.69 $ 13.07
Number of Shares [Roll Forward]    
Outstanding at beginning of period (in shares) 1,036,359  
Granted (in shares) 163,100 184,000
Exercised (in shares) (28,951)  
Forfeited (in shares) (1,000)  
Outstanding at end of period (in shares) 1,169,508  
Weighted Average Exercise Price [Roll Forward]    
Outstanding at beginning of period (in dollars per share) $ 14.92  
Granted (in dollars per share) 27.40  
Exercised (in dollars per share) 10.15  
Forfeited (in dollars per share) 29.66  
Outstanding at end of period (in dollars per share) $ 16.77  
Number of stock options unvested (in shares) 324,087  
Weighted average exercise price of stock options unvested (in dollars per share) $ 28.33  
Total unrecognized compensation expense $ 3,833,000  
Weighted average vesting period over which compensation expense is expected to be recognized 2 years 1 month 6 days