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Share-based Payments, Stock Option Activity (Details) - USD ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options outstanding, shares (in shares) 1,143,298    
Options outstanding, weighted average exercise price (in dollars per share) $ 16.97    
Options outstanding, weighted average remaining life 6 years 2 months 26 days    
Options outstanding, aggregate intrinsic value $ 8,555,000    
Options exercisable, shares (in shares) 818,024    
Options exercisable, weighted average exercise price (in dollars per share) $ 12.49    
Options exercisable, aggregate intrinsic value $ 8,555,000    
$4.17 to $6.25 [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) $ 4.17    
Exercise price of options, upper range (in dollars per share) $ 6.25    
Options outstanding, shares (in shares) 49,000    
Options outstanding, weighted average exercise price (in dollars per share) $ 4.87    
Options outstanding, weighted average remaining life 1 year 4 months 6 days    
Options exercisable, shares (in shares) 49,000    
Options exercisable, weighted average exercise price (in dollars per share) $ 4.87    
$6.26 to $7.43 [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) 6.26    
Exercise price of options, upper range (in dollars per share) $ 7.43    
Options outstanding, shares (in shares) 354,534    
Options outstanding, weighted average exercise price (in dollars per share) $ 6.48    
Options outstanding, weighted average remaining life 4 years 8 months 12 days    
Options exercisable, shares (in shares) 354,534    
Options exercisable, weighted average exercise price (in dollars per share) $ 6.48    
$7.44 to $19.94 [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) 7.44    
Exercise price of options, upper range (in dollars per share) $ 19.94    
Options outstanding, shares (in shares) 211,132    
Options outstanding, weighted average exercise price (in dollars per share) $ 9.86    
Options outstanding, weighted average remaining life 5 years 2 months 23 days    
Options exercisable, shares (in shares) 211,132    
Options exercisable, weighted average exercise price (in dollars per share) $ 9.86    
$19.95 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) 19.95    
Exercise price of options, upper range (in dollars per share) $ 34.17    
Options outstanding, shares (in shares) 528,632    
Options outstanding, weighted average exercise price (in dollars per share) $ 27.96    
Options outstanding, weighted average remaining life 8 years 1 month 13 days    
Options exercisable, shares (in shares) 203,358    
Options exercisable, weighted average exercise price (in dollars per share) $ 27.54    
Stock Options [Member]      
Number of Shares [Roll Forward]      
Outstanding at beginning of period (in shares) 1,036,359    
Granted (in shares) 170,890    
Exercised (in shares) (55,351)    
Forfeited (in shares) (8,600)    
Outstanding at end of period (in shares) 1,143,298 1,036,359  
Weighted Average Exercise Price [Roll Forward]      
Outstanding at beginning of period (in dollars per share) $ 14.92    
Granted (in dollars per share) 27.27    
Exercised (in dollars per share) 8.65    
Forfeited (in dollars per share) 28.92    
Outstanding at end of period (in dollars per share) $ 16.97 $ 14.92  
Number of stock options unvested (in shares) 325,274    
Weighted average exercise price of stock options unvested (in dollars per share) $ 28.23    
Pre-tax intrinsic value of options exercised $ 913,000 $ 2,477,000 $ 14,002,000
Fair value of vested stock options $ 1,572,000 $ 1,290,000 $ 905,000
Closing stock price (in dollars per share) $ 21.43    
Total unrecognized compensation expense, options $ 2,795,000    
Weighted average vesting period over which compensation expense is expected to be recognized 1 year 8 months 12 days