Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
12 Months Ended
May 31, 2021
Jul. 15, 2021
Nov. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date May 31, 2021    
Entity File Number 000-49908    
Entity Registrant Name CytoDyn Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 83-1887078    
Entity Address, Address Line One 1111 Main Street, Suite 660    
Entity Address, City or Town Vancouver    
Entity Address, State or Province WA    
Entity Address, Postal Zip Code 98660    
City Area Code 360    
Local Phone Number 980-8524    
Title of 12(g) Security Common Stock, par value $0.001 per share    
No Trading Symbol Flag true    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Common Stock, Shares Outstanding   632,586,877  
Entity Public Float     $ 1,534,001,633
Current Fiscal Year End Date --05-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001175680    
Amendment Flag false