Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Feb. 28, 2017
Mar. 31, 2017
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Feb. 28, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3  
Trading Symbol CYDY  
Entity Registrant Name CYTODYN INC.  
Entity Central Index Key 0001175680  
Current Fiscal Year End Date --05-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   149,468,244