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Share-based Payments, Stock Option Activity (Details) - USD ($)
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options outstanding, shares (in shares) 1,536,123    
Options outstanding, weighted average exercise price (in dollars per share) $ 18.18    
Options outstanding, weighted average remaining life 5 years 11 months 26 days    
Options outstanding, aggregate intrinsic value $ 2,567,000    
Options exercisable, shares (in shares) 1,022,925    
Options exercisable, weighted average exercise price (in dollars per share) $ 17.10    
Options exercisable, weighted average remaining life 4 years 7 months 13 days    
Options exercisable, aggregate intrinsic value $ 2,567,000    
$5.20 to $6.47 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price of options, lower range (in dollars per share) $ 5.20    
Exercise price of options, upper range (in dollars per share) $ 6.47    
Options outstanding, shares (in shares) 311,634    
Options outstanding, weighted average exercise price (in dollars per share) $ 6.46    
Options outstanding, weighted average remaining life 2 years 9 months    
Options exercisable, shares (in shares) 311,634    
Options exercisable, weighted average exercise price (in dollars per share) $ 6.46    
Options exercisable, weighted average remaining life 2 years 9 months    
$6.48 to $18.20 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price of options, lower range (in dollars per share) $ 6.48    
Exercise price of options, upper range (in dollars per share) $ 18.20    
Options outstanding, shares (in shares) 223,600    
Options outstanding, weighted average exercise price (in dollars per share) $ 10.19    
Options outstanding, weighted average remaining life 3 years 7 months 10 days    
Options exercisable, shares (in shares) 204,300    
Options exercisable, weighted average exercise price (in dollars per share) $ 9.58    
Options exercisable, weighted average remaining life 3 years 22 days    
$18.21 to $22.83 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price of options, lower range (in dollars per share) $ 18.21    
Exercise price of options, upper range (in dollars per share) $ 22.83    
Options outstanding, shares (in shares) 524,251    
Options outstanding, weighted average exercise price (in dollars per share) $ 19.56    
Options outstanding, weighted average remaining life 8 years 9 months 7 days    
Options exercisable, shares (in shares) 83,183    
Options exercisable, weighted average exercise price (in dollars per share) $ 19.17    
Options exercisable, weighted average remaining life 8 years 2 months 23 days    
$22.84 to $28.04 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price of options, lower range (in dollars per share) $ 22.84    
Exercise price of options, upper range (in dollars per share) $ 28.04    
Options outstanding, shares (in shares) 216,499    
Options outstanding, weighted average exercise price (in dollars per share) $ 26.19    
Options outstanding, weighted average remaining life 6 years 5 months 8 days    
Options exercisable, shares (in shares) 163,669    
Options exercisable, weighted average exercise price (in dollars per share) $ 25.82    
Options exercisable, weighted average remaining life 6 years 2 months 5 days    
$28.05 to $34.17 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price of options, lower range (in dollars per share) $ 28.05    
Exercise price of options, upper range (in dollars per share) $ 34.17    
Options outstanding, shares (in shares) 260,139    
Options outstanding, weighted average exercise price (in dollars per share) $ 29.61    
Options outstanding, weighted average remaining life 5 years 11 months 8 days    
Options exercisable, shares (in shares) 260,139    
Options exercisable, weighted average exercise price (in dollars per share) $ 29.61    
Options exercisable, weighted average remaining life 5 years 11 months 8 days    
Stock Options [Member]      
Number of Shares [Roll Forward]      
Outstanding at beginning of period (in shares) 1,337,165    
Granted (in shares) 302,539    
Exercised (in shares) (59,600)    
Forfeited (in shares) (43,981)    
Outstanding at end of period (in shares) 1,536,123 1,337,165  
Weighted Average Exercise Price [Roll Forward]      
Outstanding at beginning of period (in dollars per share) $ 17.58    
Granted (in dollars per share) 19.72    
Exercised (in dollars per share) 7.65    
Forfeited (in dollars per share) 24.98    
Outstanding at end of period (in dollars per share) $ 18.18 $ 17.58  
Number of stock options unvested (in shares) 513,198    
Weighted average exercise price of stock options unvested (in dollars per share) $ 20.32    
Pre-tax intrinsic value of options exercised $ 508,000 $ 788,000 $ 913,000
Fair value of vested stock options $ 2,189,000 $ 1,973,000 $ 1,572,000
Closing stock price (in dollars per share) $ 12.58    
Total unrecognized compensation expense, options $ 2,883,000    
Weighted average vesting period over which compensation expense is expected to be recognized 1 year 9 months 18 days