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Concentration of Risk (Details) | 3 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017
Customer receivables | Customer A |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 28.40% | 10.30%
Customer receivables | Customer B |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 22.00% | 15.60%
Sales revenue, gross | Customer A |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 29.10% | 18.40%
Sales revenue, gross | Customer B |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 18.70% | 13.90%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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