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SEGMENT INFORMATION (Details) - Disaggregation of Revenue - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 12,936	$ 13,990	$ 25,890	$ 26,940
Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenues	10,381	11,156	20,543	20,996
Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,648	3,430	5,783	7,353
Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	(93)	(596)	(436)	(1,409)
POC Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	12,228	12,940	24,629	24,591
POC Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,928	10,235	19,529	18,857
POC Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,300	2,706	5,100	5,744
POC Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	(1)	0	(10)
POT Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	708	1,050	1,261	2,349
POT Revenue [Member] | Frequency Electronics Inc New York [Member]
Disaggregation of Revenue [Line Items]
Revenues	453	921	1,014	2,139
POT Revenue [Member] | Frequency Electronics Inc Zyfer [Member]
Disaggregation of Revenue [Line Items]
Revenues	348	724	683	1,609
POT Revenue [Member] | Inter Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ (93)	$ (595)	$ (436)	$ (1,399)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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