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Credit Concentration (Tables) | 12 Months Ended
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Apr. 30, 2014
Credit Concentration [Abstract] |
Summary Of Percentage Of Sales |
| PERCENT OF ANNUAL GROSS SALES
| 2014 |  | 2013 |  | 2012
Customer A | 28.6 |  | 35.7 |  | 41.5
Customer B | 20.6 |  | 22.8 |  | 26.0

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