Quarterly report pursuant to Section 13 or 15(d)

Revenue - Narrative (Details)

v3.21.2
Revenue - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
Disaggregation of Revenue [Line Items]          
Deferred revenue $ 10,191,241   $ 10,191,241   $ 6,825,014
Recognition of deferred revenue     $ 5,407,735    
Revenue Benchmark | Non-US | Customer Concentration Risk          
Disaggregation of Revenue [Line Items]          
Percentage of revenues from students outside the United States 1.00% 1.00% 1.00% 1.00%