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Credit Concentration (Details) | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Accounts Receivable [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 12.40% | 14.40% |
Accounts Receivable [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 21.00% | 21.90% |
Sales Revenue, Gross [Member] | Customer A [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 23.90% | 26.50% | 28.60%
Sales Revenue, Gross [Member] | Customer B [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 17.20% | 18.60% | 20.60%

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