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Share-based Payments, Stock Option Activity (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Options outstanding, shares (in shares) | 1,036,359 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 14.92 |  |
Options outstanding, weighted average remaining life | 6 years 5 months 23 days |  |
Options outstanding, aggregate intrinsic value | $ 16,384,000 |  |
Options exercisable, shares (in shares) | 751,746 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 9.67 |  |
Options exercisable, aggregate intrinsic value | $ 15,832,000 |  |
$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) | 74,000 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 5.29 |  |
Options outstanding, weighted average remaining life | 1 year 10 months 24 days |  |
Options outstanding, aggregate intrinsic value | $ 1,883,000 |  |
Options exercisable, shares (in shares) | 74,000 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 5.29 |  |
Options exercisable, aggregate intrinsic value | $ 1,883,000 |  |
$6.46 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) | $ 6.46 |  |
Exercise price of options, upper range (in dollars per share) | $ 7.43 |  |
Options outstanding, shares (in shares) | 359,167 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 6.48 |  |
Options outstanding, weighted average remaining life | 5 years 8 months 8 days |  |
Options outstanding, aggregate intrinsic value | $ 8,710,000 |  |
Options exercisable, shares (in shares) | 359,167 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 6.48 |  |
Options exercisable, aggregate intrinsic value | $ 8,710,000 |  |
$9.32 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) | $ 9.32 |  |
Exercise price of options, upper range (in dollars per share) | $ 19.94 |  |
Options outstanding, shares (in shares) | 235,450 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 9.96 |  |
Options outstanding, weighted average remaining life | 5 years 9 months 29 days |  |
Options outstanding, aggregate intrinsic value | $ 4,891,000 |  |
Options exercisable, shares (in shares) | 235,450 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 9.96 |  |
Options exercisable, aggregate intrinsic value | $ 4,891,000 |  |
$22.93 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) | $ 22.93 |  |
Exercise price of options, upper range (in dollars per share) | $ 34.17 |  |
Options outstanding, shares (in shares) | 367,742 |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 28.28 |  |
Options outstanding, weighted average remaining life | 8 years 7 months 6 days |  |
Options outstanding, aggregate intrinsic value | $ 900,000 |  |
Options exercisable, shares (in shares) | 83,129 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 26.55 |  |
Options exercisable, aggregate intrinsic value | $ 348,000 |  |
Stock Options [Member] |  |  |
Number of Shares [Roll Forward] |  |  |
Outstanding at beginning of period (in shares) | 984,066 |  |
Granted (in shares) | 186,924 |  |
Exercised (in shares) | (133,731) |  |
Forfeited (in shares) | (900) |  |
Outstanding at end of period (in shares) | 1,036,359 | 984,066 |
Weighted Average Exercise Price [Roll Forward] |  |  |
Outstanding at beginning of period (in dollars per share) | $ 11.98 |  |
Granted (in dollars per share) | 28.70 |  |
Exercised (in dollars per share) | 12.43 |  |
Forfeited (in dollars per share) | 29.50 |  |
Outstanding at end of period (in dollars per share) | $ 14.92 | $ 11.98 |
Number of stock options unvested (in shares) | 284,613 |  |
Weighted average exercise price of stock options unvested (in dollars per share) | $ 13.04 |  |
Pre-tax intrinsic value of options exercised | $ 2,477,000 | $ 14,002,000 | $ 1,955,000
Fair value of vested stock options | $ 1,290,000 | $ 905,000 | $ 978,000
Closing stock price (in dollars per share) | $ 30.73 |  |
Total unrecognized compensation expense, options | $ 2,666,000 |  |
Weighted average vesting period over which compensation expense is expected to be recognized | 1 year 10 months 24 days |  |

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