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v3.19.3.a.u2

Concentration of Risk (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Customer receivables | Customer A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) |  |  | 30.30% | 26.40%
Customer receivables | Customer B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) |  |  | 24.50% | 24.40%
Sales revenue, gross | Customer A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) | 30.10% | 29.30% | 29.20% | 29.00%
Sales revenue, gross | Customer B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (as a percent) | 18.30% | 19.20% | 17.20% | 18.40%

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