Quarterly report pursuant to Section 13 or 15(d)

Revenue - Narrative (Details)

v3.21.2
Revenue - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Disaggregation of Revenue [Line Items]    
Total revenue earned, deferred revenue $ 6.8 $ 3.7
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%