Equity-Based Compensation - (Tables)

6 Months Ended

Oct. 31, 2018

Equity-Based Compensation

Summary of stock option activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number of	Exercise		Contractual	Intrinsic
	Options	Price		Life (years)	Value
	(shares and dollars in thousands)
Outstanding as of April 30, 2018	1,952	$	14.37	6.52	$	33,209
Options granted	374		25.58
Options exercised	(78)		12.44
Options forfeited	(5)		36.23
Options expired	—		—
Outstanding as of October 31, 2018	2,243	$	16.26	6.64	$	6,365
Exercisable as of October 31, 2018	1,708	$	13.14	5.83	$	6,330
Vested and expected to vest as of October 31, 2018	2,232	$	16.20	6.63	$	6,365

Schedule of weighted average assumptions used in Black-Scholes option-pricing model

	Six Months Ended
	October 31, 2018
Volatility	33.71	%
Expected life (years)	6.0
Risk-free interest rate	2.87	%
Dividend yield	—	%

Summary of restricted stock unity activity

		Weighted
	Number of	Average
	Restricted	Exercise
	Stock Units	Price
Outstanding as of April 30, 2018	21,766	$	37.49
Granted	166,973		25.58
Vested	(655)		37.49
Forfeited	(1,229)		35.37
Outstanding as of October 31, 2018	186,855	$	26.86