Equity-Based Compensation - Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Number of Options
Outstanding, beginning of the period (in shares)	1,487
Options granted (in shares)	321
Options exercised (in shares)	(467)
Options forfeited (in shares)	(52)
Outstanding, end of the period (in shares)	1,289	1,487
Exercisable at end of period (in shares)	676
Vested and expected to vest at end of period (in shares)	1,284
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 18.85
Options granted (in dollars per share)	23.43
Options exercised (in dollars per share)	15.68
Options forfeited (in dollars per share)	25.79
Outstanding, end of the period (in dollars per share)	20.86	$ 18.85
Exercisable at end of period (in dollars per share)	18.99
Vested and expected to vest at end of period (in dollars per share)	$ 20.85
Other disclosures
Weighted Average Remaining Contractual Life, Outstanding (in years)	6 years 9 months 18 days	6 years 4 months 24 days
Weighted Average Remaining Contractual Life, Exercisable at end of period (in years)	5 years 1 month 6 days
Weighted Average Remaining Contractual Life, Vested and expected to vest at end of period (in years)	6 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 29,465	$ 3,895
Aggregate Intrinsic Value, Exercisable at end of period	16,720
Aggregate Intrinsic Value, Vested and expected to vest at end of period	29,361
Intrinsic value of options exercised	9,900	$ 11,500	$ 1,600
Unrecognized compensation cost	$ 3,900
Weighted-average period for recognition of unrecognized compensation expense (in years)	1 year 9 months 18 days