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Document and Entity Information (USD $)
 3 Months Ended
Aug. 31, 2012
Oct. 10, 2012
Document And Entity Information    
Entity Registrant Name Taylor Devices Inc  
Entity Central Index Key 0000096536  
Document Type 10-Q  
Document Period End Date Aug. 31, 2012  
Amendment Flag false  
Current Fiscal Year End Date --05-31  
Is Entity a Well-known Seasoned Issuer? No  
Is Entity a Voluntary Filer? No  
Is Entity's Reporting Status Current? Yes  
Entity Filer Category Smaller Reporting Company  
Entity Public Float   $ 28,204,000
Entity Common Stock, Shares Outstanding   3,310,341
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2013