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Concentration of Risk (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Apr. 30, 2017
Customer receivables | Customer A |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 31.30% | 8.20%
Customer receivables | Customer B |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 22.00% | 20.70%
Sales revenue, gross | Customer A |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 21.80% | 20.20%
Sales revenue, gross | Customer B |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 14.40% | 15.90%

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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