Quarterly report pursuant to Section 13 or 15(d)

Cover Page

Cover Page - shares
3 Months Ended
Aug. 31, 2021
Sep. 30, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Aug. 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  
Entity Address, Address Line Two 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(b) Security None.  
No Trading Symbol Flag true  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   660,191,552
Current Fiscal Year End Date --05-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0001175680  
Amendment Flag false