Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Number of Stock Options Outstanding
Balance at beginning of period (in shares)	38,487	32,877
Options granted (in shares)	6,327	14,504
Options exercised (in shares)	(4,651)	(5,799)
Options cancelled (in shares)	(3,825)	(3,095)
Balance at end of period (in shares)	36,338	38,487	32,877
Vested and exercisable at end of period (in shares)	16,300
Vested and expected to vest at end of period (in shares)	36,712
Weighted Average Exercise Price
Balance at beginning of period (in dollars per share)	$ 6.39	$ 3.48
Options granted (in dollars per share)	45.41	11.50
Options exercised (in dollars per share)	4.61	2.90
Options cancelled (in dollars per share)	15.29	5.89
Balance at end of period (in dollars per share)	12.44	$ 6.39	$ 3.48
Vested and exercisable at end of period (in dollars per share)	5.63
Vested and expected to vest at end of period (in dollars per share)	$ 12.44
Weighted Average Remaining Contractual Life (years)
Balance at beginning of period (in years)	7 years 4 months 2 days	7 years 11 months 23 days	8 years 10 days
Balance at end of period (in years)	7 years 4 months 2 days	7 years 11 months 23 days	8 years 10 days
Vested and exercisable at end of period (in years)	6 years 4 months 20 days
Vested and expected to vest at end of period (in years)	7 years 4 months 2 days
Aggregate Intrinsic Value
Balance at beginning of period	$ 165,436	$ 2,304,714	$ 116,962
Balance at end of period	165,436	$ 2,304,714	$ 116,962
Vested and exercisable at end of period	185,103
Vested and expected to vest at end of period	$ 167,138