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DOCUMENT AND ENTITY INFORMATION - USD ($)
 12 Months Ended
Jul. 31, 2021
Sep. 06, 2021
Jan. 31, 2021
Document And Entity Information [Abstract]      
Entity Registrant Name MAYS J W INC    
Entity Central Index Key 0000054187    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jul. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Incorporation State Country Code NY    
Entity File Number 1-3647    
Current Fiscal Year End Date --07-31    
Entity Well-Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   2,015,780  
Entity Public Float     $ 10,510,864