Share-based Payments - Stock Options Activity (Details) - Stock Options [Member] - USD ($)	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted [Abstract]
Weighted average risk free interest rate	2.82%	1.90%
Weighted average expected holding period	5 years 11 months 8 days	5 years 9 months 25 days
Weighted average expected volatility	43.98%	47.36%
Weighted average expected dividend yield	0.00%	0.00%
Weighted average fair value of options granted (in dollars per share)	$ 8.71	$ 12.69
Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	1,143,298
Granted (in shares)	245,400	163,100
Exercised (in shares)	(39,032)
Forfeited (in shares)	(9,700)
Outstanding at end of period (in shares)	1,339,966
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 16.97
Granted (in dollars per share)	19.02
Exercised (in dollars per share)	6.24
Forfeited (in dollars per share)	26.43
Outstanding at end of period (in dollars per share)	$ 17.59
Number of stock options unvested (in shares)	418,539
Weighted average exercise price of stock options unvested (in dollars per share)	$ 22.66
Total unrecognized compensation expense	$ 3,721,000
Weighted average vesting period over which compensation expense is expected to be recognized	2 years 1 month 6 days