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Concentration of Risk (Details) - Customer Concentration Risk | 3 Months Ended | 9 Months Ended
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Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2025 | Jan. 31, 2024
Customer receivables | Customer A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) |  |  | 41.10% | 33.50%
Customer receivables | Customer B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) |  |  | 15.50% | 18.60%
Sales revenue, gross | Customer A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) | 31.70% | 29.10% | 28.70% | 28.40%
Sales revenue, gross | Customer B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) | 11.90% | 12.20% | 11.50% | 13.10%

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