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Concentration of Risk (Details) - Customer Concentration Risk | 3 Months Ended
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Jul. 31, 2022 | Jul. 31, 2021
Customer receivables | Customer A |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) | 33.60% | 31.20%
Customer receivables | Customer B |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) | 17.20% | 19.60%
Sales revenue, gross | Customer A |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) | 30.30% | 31.80%
Sales revenue, gross | Customer B |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percent) | 14.20% | 15.50%

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