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Segment Information (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Identifiable assets:    
Identifiable Assets $ 91,276 $ 86,771
Identifiable Assets (91,276) (86,771)
Frequency Electronics Inc New York [Member]    
Identifiable assets:    
Identifiable Assets 44,599 54,295
Identifiable Assets (44,599) (54,295)
Frequency Electronics Inc Zyfer [Member]    
Identifiable assets:    
Identifiable Assets 13,344 10,478
Identifiable Assets (13,344) (10,478)
Inter Segment [Member]    
Identifiable assets:    
Identifiable Assets 8,586 8,346
Identifiable Assets (8,586) (8,346)
Corporate Segment [Member]    
Identifiable assets:    
Identifiable Assets 41,919 30,344
Identifiable Assets $ (41,919) $ (30,344)