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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 |  |

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