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Share-based Payments, Stock Option Activity (Details) - USD ($) | 12 Months Ended
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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 |  |

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