v3.8.0.1
Document And Entity Information - shares
9 Months Ended
Jan. 31, 2018
Mar. 12, 2018
Document and Entity Information [Abstract]    
Entity Registrant Name FREQUENCY ELECTRONICS INC  
Document Type 10-Q  
Current Fiscal Year End Date --04-30  
Entity Common Stock, Shares Outstanding   8,729,682
Amendment Flag false  
Entity Central Index Key 0000039020  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Jan. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3