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Segment Information (Details)	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Segment Information (Details) [Line Items]
Number of Reportable Segments	2
Number of Operating Segments	2
Frequency Electronics Inc New York [Member]
Segment Information (Details) [Line Items]
Number Of Principal Markets	3
Customer Concentration Risk [Member] | U.S. Government and U.S. Government Subcontractors [Member] | Revenue Benchmark [Member]
Segment Information (Details) [Line Items]
Concentration Risk, Percentage	83.00%	87.00%

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Number of Principal Markets

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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

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-Publisher FASB
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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