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Credit Concentration (Tables) | 12 Months Ended
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Apr. 30, 2017
Risks and Uncertainties [Abstract] |
Summary Of Percentage Of Sales | The following table summarizes the percentage of sales to the Company's two largest customers for the last three fiscal years:
| PERCENT OF ANNUAL GROSS SALES
| 2017 |  | 2016 |  | 2015
Customer A | 20.7% |  | 23.9% |  | 26.5%
Customer B | 16.5% |  | 17.2% |  | 18.6%

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