Revenue - Narrative (Details) - USD ($)	3 Months Ended
Jul. 31, 2022	Jul. 31, 2021	Apr. 30, 2022
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 6,245,530		$ 5,889,911
Recognition of deferred revenue	$ 4,634,974
Revenue Benchmark \| Non-US \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenues from students outside the United States	2.00%	1.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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