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Share-based Payments - Stock Options Activity (Details) - Stock Options [Member]
 6 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
$ / shares
shares
Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted [Abstract]    
Weighted average risk free interest rate 1.77% 2.82%
Weighted average expected holding period 5 years 8 months 12 days 5 years 11 months 8 days
Weighted average expected volatility 42.51% 43.98%
Weighted average expected dividend yield 0.00% 0.00%
Weighted average fair value of options granted (in dollars per share) $ 8.28 $ 8.71
Number of Shares [Roll Forward]    
Outstanding at beginning of period (in shares) | shares 1,337,165  
Granted (in shares) | shares 300,039 245,400
Exercised (in shares) | shares (52,800)  
Forfeited (in shares) | shares (5,171)  
Outstanding at end of period (in shares) | shares 1,579,233  
Weighted Average Exercise Price [Roll Forward]    
Outstanding at beginning of period (in dollars per share) $ 17.58  
Granted (in dollars per share) 19.75  
Exercised (in dollars per share) 7.67  
Forfeited (in dollars per share) 20.62  
Outstanding at end of period (in dollars per share) $ 18.31  
Number of stock options unvested (in shares) | shares 522,677  
Weighted average exercise price of stock options unvested (in dollars per share) $ 20.37  
Total unrecognized compensation expense | $ $ 4,037,000  
Weighted average vesting period over which compensation expense is expected to be recognized 2 years 2 months 12 days