Equity-Based Compensation - Restricted Stock Units (Details) - Restricted stock units $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jul. 31, 2020 USD ($) $ / shares shares
Number of Restricted Stock Units
Outstanding, beginning of the period (in shares) | shares	286
Vested (in shares) | shares	(14)
Forfeited (in shares) | shares	(22)
Outstanding, end of the period (in shares) | shares	250
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 22.71
Vested (in dollars per share) | $ / shares	18.04
Forfeited (in dollars per share) | $ / shares	23.81
Outstanding, end of the period (in dollars per share) | $ / shares	$ 22.87
Unrecognized compensation cost | $	$ 2.9
Weighted-average period for recognition of unrecognized compensation expense (in years)	1 year 8 months 12 days