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Share-based Payments, Stock Option Activity (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares (in shares)	1,337,165
Options outstanding, weighted average exercise price (in dollars per share)	$ 17.58
Options outstanding, weighted average remaining life	6 years 1 month 10 days
Options outstanding, aggregate intrinsic value	$ 6,436,000
Options exercisable, shares (in shares)	916,195
Options exercisable, weighted average exercise price (in dollars per share)	$ 15.28
Options exercisable, aggregate intrinsic value	$ 6,436,000
$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)	345,534
Options outstanding, weighted average exercise price (in dollars per share)	$ 6.43
Options outstanding, weighted average remaining life	3 years 7 months 24 days
Options exercisable, shares (in shares)	345,534
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.43
$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)	229,200
Options outstanding, weighted average exercise price (in dollars per share)	$ 9.55
Options outstanding, weighted average remaining life	4 years 1 month 6 days
Options exercisable, shares (in shares)	229,200
Options exercisable, weighted average exercise price (in dollars per share)	$ 9.55
$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)	254,126
Options outstanding, weighted average exercise price (in dollars per share)	$ 19.14
Options outstanding, weighted average remaining life	9 years 2 months 26 days
Options exercisable, shares (in shares)	630
Options exercisable, weighted average exercise price (in dollars per share)	$ 22.73
$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)	230,166
Options outstanding, weighted average exercise price (in dollars per share)	$ 26.05
Options outstanding, weighted average remaining life	7 years 4 months 10 days
Options exercisable, shares (in shares)	121,197
Options exercisable, weighted average exercise price (in dollars per share)	$ 24.91
$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)	278,139
Options outstanding, weighted average exercise price (in dollars per share)	$ 29.62
Options outstanding, weighted average remaining life	6 years 11 months 8 days
Options exercisable, shares (in shares)	219,634
Options exercisable, weighted average exercise price (in dollars per share)	$ 29.86
Stock Options [Member]
Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	1,143,298
Granted (in shares)	259,136
Exercised (in shares)	(42,032)
Forfeited (in shares)	(23,237)
Outstanding at end of period (in shares)	1,337,165	1,143,298
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 16.97
Granted (in dollars per share)	19.13
Exercised (in dollars per share)	6.09
Forfeited (in dollars per share)	25.46
Outstanding at end of period (in dollars per share)	$ 17.58	$ 16.97
Number of stock options unvested (in shares)	420,970
Weighted average exercise price of stock options unvested (in dollars per share)	$ 22.58
Pre-tax intrinsic value of options exercised	$ 788,000	$ 913,000	$ 2,477,000
Fair value of vested stock options	$ 1,973,000	$ 1,572,000	$ 1,290,000
Closing stock price (in dollars per share)	$ 18.87
Total unrecognized compensation expense, options	$ 2,682,000
Weighted average vesting period over which compensation expense is expected to be recognized	1 year 9 months 18 days

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