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Document and Entity Information - shares
 6 Months Ended
Nov. 30, 2016
Jan. 07, 2017
Document And Entity Information    
Entity Registrant Name Taylor Devices Inc  
Entity Central Index Key 0000096536  
Document Type 10-Q/A  
Document Period End Date Nov. 30, 2016  
Amendment Flag true  
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 Common Stock, Shares Outstanding   3,431,312
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2017  
Amendment Description Changed context dates of Statements of Operations from 8-1 beginning to 9-1 beginning.