Share-based Payments (Details) - USD ($)	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Stock Options [Member]
Summary of Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted [Abstract]
Weighted average risk-free interest rate	1.73%	1.75%
Weighted average expected holding period	5 years 9 months 4 days	5 years 4 days
Weighted average expected volatility	46.84%	46.02%
Weighted average expected dividend yield	0.00%	0.00%
Weighted average fair value of options granted (in dollars per share)	$ 14.13	$ 9.65
Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	1,389,254
Granted (in shares)	110,122	82,537
Exercised (in shares)	(294,757)
Cancelled (in shares)	0
Outstanding at end of period (in shares)	1,204,619
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 9.97
Granted (in dollars per share)	31.13
Exercised (in dollars per share)	10.03
Cancelled (in dollars per share)	0
Outstanding at end of period (in dollars per share)	$ 11.89
Number of stock options exercisable (in shares)	906,082
Weighted average exercise price of stock options exercisable (in dollars per share)	$ 9.12
Total unrecognized compensation expense	$ 2,547,000
Weighted average vesting period over which compensation expense is expected to be recognized	1 year 8 months 12 days
Restricted Stock (RSUs) [Member]
Weighted Average Exercise Price [Roll Forward]
Weighted average vesting period over which compensation expense is expected to be recognized	1 year 9 months 18 days
Number of Shares [Roll Forward]
Non-vested stock at beginning of period (in shares)	181,443
Granted (in shares)	39,900	95,645
Vested (in shares)	(75,519)
Cancelled (in shares)	0
Non-vested stock at end of period (in shares)	145,824
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested restricted stock at beginning of period (in dollars per share)	$ 16.84
Restricted stock granted (in dollars per share)	31.13
Restricted stock vested (in dollars per share)	15.34
Restricted stock cancelled (in dollars per share)	0
Non-vested restricted stock at end of period (in dollars per share)	$ 21.53
Total unrecognized compensation expense	$ 2,946,000
Estimated fair value of awards granted	$ 1,242,000	$ 2,316,000