Supplemental Information Major Customers (Details) - Revenue from Contract with Customer, Product and Service Benchmark [Member]	12 Months Ended
Apr. 30, 2021	Apr. 30, 2020
Largest Customer [Member]
Percentage of Net Sales from Major Customers [Abstract]
Concentration Risk, Percentage	19.00%	18.00%
Second Largest Customer [Member]
Percentage of Net Sales from Major Customers [Abstract]
Concentration Risk, Percentage	13.00%	13.00%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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