Stock-Based Compensation - Narrative (Details) - USD ($)	1 Months Ended		12 Months Ended
	Sep. 30, 2020	Jan. 31, 2018	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019	Nov. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value for options granted (in dollars per share)			$ 6.17
Stock options exercised, total intrinsic value			$ 137,300,000
Stock options vested, total grant date fair value			15,000,000.0
Stock-based compensation expense			21,740,000	$ 8,310,000	$ 4,267,000
Chief Executive Officer (CEO)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Notes receivable		$ 24,500,000
Proceeds from notes receivable payment	$ 26,000,000.0
Chief Executive Officer (CEO) | Notes Receivable
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Interest income	$ 0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			$ 97,800,000
Unrecognized compensation cost, weighted-average recognition period			3 years 9 months 18 days
Vesting period			5 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, weighted-average recognition period			4 years 9 months 18 days
Vesting period			5 years
Stock-based compensation expense			$ 1,000,000.0
Unrecognized stock-based compensation expense, non-options			$ 32,200,000
2020 Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years
2020 Employee Stock Purchase Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of employee earnings participation (not exceeding)						15.00%
Class A Common Stock | 2020 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)						67,535,205
Class A Common Stock | 2020 Employee Stock Purchase Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)						3,000,000
Series F Preferred Stock | Chief Executive Officer (CEO)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period (in shares)		1,251,921