Equity-Based Compensation - Restricted Stock Units (Details) - Restricted stock units $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
	Jan. 31, 2021 USD ($) $ / shares shares
Number of Restricted Stock Units
Outstanding, beginning of the period (in shares) | shares	286
Granted (in shares) | shares	214
Vested (in shares) | shares	(110)
Forfeited (in shares) | shares	(28)
Outstanding, end of the period (in shares) | shares	362
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 22.71
Granted (in dollars per share) | $ / shares	23.48
Vested (in dollars per share) | $ / shares	23.21
Forfeited (in dollars per share) | $ / shares	23.93
Outstanding, end of the period (in dollars per share) | $ / shares	$ 22.92
Unrecognized compensation cost | $	$ 5.2
Weighted-average period for recognition of unrecognized compensation expense (in years)	1 year 9 months 18 days