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Concentration of Risk (Details) - Customer Concentration Risk | 3 Months Ended | 6 Months Ended
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Oct. 31, 2022 | Oct. 31, 2021 | Oct. 31, 2022 | Oct. 31, 2021
Customer receivables | Customer A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) |  |  | 31.70% | 31.20%
Customer receivables | Customer B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) |  |  | 17.50% | 19.60%
Sales revenue, gross | Customer A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) | 28.90% | 31.70% | 29.60% | 31.80%
Sales revenue, gross | Customer B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) | 13.40% | 15.80% | 13.80% | 15.60%

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