Leases (Details)	3 Months Ended
	Jul. 31, 2020 USD ($) ft²
Lessee, Lease, Description [Line Items]
Amount of office and classroom space leased (in square feet) | ft²	88,600
Incremental borrowing rate (as a percent)	12.00%
Lease expense	$ 397,238
Tampa, Florida
Lessee, Lease, Description [Line Items]
Leases not yet commenced, liability	10,200,000
Phoenix, Arizona
Lessee, Lease, Description [Line Items]
Leases not yet commenced, liability	5,200,000
Austin, Texas
Lessee, Lease, Description [Line Items]
Leases not yet commenced, liability	$ 4,300,000