Restructuring - Components of Restructuring Charges (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2022		Apr. 30, 2021	Apr. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 10,244,658		$ 0	$ 0
Severance and Employee-Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,187,558	[1]	0	0
Consulting Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,627,710		0	0
Employee relations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	368,484		0	0
Office Rent and Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 60,906		$ 0	$ 0

[1] None of these amounts have been paid as of April 30, 2022, and the balance has been recorded in accrued payroll and incentives on our balance sheet.