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Share-based Payments - Stock Options Activity (Details) - Stock Options [Member]
 6 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
$ / 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 0.44% 1.77%
Weighted average expected holding period 5 years 11 months 15 days 5 years 8 months 12 days
Weighted average expected volatility 44.90% 42.51%
Weighted average expected dividend yield 0.00% 0.00%
Weighted average fair value of options granted (in dollars per share) $ 6.43 $ 8.28
Number of Shares [Roll Forward]    
Outstanding at beginning of period (in shares) | shares 1,536,123  
Granted (in shares) | shares 345,423 300,039
Exercised (in shares) | shares (9,000)  
Forfeited (in shares) | shares (23,280)  
Outstanding at end of period (in shares) | shares 1,849,266  
Weighted Average Exercise Price [Roll Forward]    
Outstanding at beginning of period (in dollars per share) $ 18.18  
Granted (in dollars per share) 15.16  
Exercised (in dollars per share) 10.32  
Forfeited (in dollars per share) 21.97  
Outstanding at end of period (in dollars per share) $ 17.60  
Number of stock options unvested (in shares) | shares 616,682  
Weighted average exercise price of stock options unvested (in dollars per share) $ 17.13  
Total unrecognized compensation expense | $ $ 3,893,000  
Weighted average vesting period over which compensation expense is expected to be recognized 2 years 1 month 6 days