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SEGMENT INFORMATION (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Identifiable assets:    
Identifiable Assets $ 88,944 $ 91,276
Identifiable Assets (88,944) (91,276)
Frequency Electronics Inc New York [Member]    
Identifiable assets:    
Identifiable Assets 42,732 44,599
Identifiable Assets (42,732) (44,599)
Frequency Electronics Inc Zyfer [Member]    
Identifiable assets:    
Identifiable Assets 14,786 13,344
Identifiable Assets (14,786) (13,344)
Inter Segment [Member]    
Identifiable assets:    
Identifiable Assets 0 8,586
Identifiable Assets 0 (8,586)
Corporate Segment [Member]    
Identifiable assets:    
Identifiable Assets 31,426 41,919
Identifiable Assets $ (31,426) $ (41,919)