Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
May 31, 2019
Jun. 30, 2019
Nov. 30, 2018
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date May 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name CytoDyn Inc.    
Entity Central Index Key 0001175680    
Current Fiscal Year End Date --05-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Address, State or Province WA    
Entity Emerging Growth Company false    
Entity Public Float     $ 144,497,302
Entity Common Stock, Shares Outstanding   364,748,563