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/A    
Amendment Flag true    
Document Period End Date May 31, 2021    
Document Fiscal Year Focus 2021    
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 Large Accelerated Filer    
Entity Small Business true    
Entity File Number 000-49908    
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    
Entity Emerging Growth Company false    
Entity Public Float     $ 1,534,001,633
Entity Common Stock, Shares Outstanding   632,586,877  
Amendment Description This Amendment No. 1 on Form 10-K/A (this “Form 10-K/A”) to the Annual Report on Form 10-K of CytoDyn Inc. for the fiscal year ended May 31, 2021, filed with the Securities and Exchange Commission (the “SEC”) on July 30, 2021 (the “Original 10-K”) is being filed solely for the purpose of including the information required by Part III of Form 10-K. This information was previously omitted from the Original 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information in the above referenced items to be incorporated in the Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are filing this Amendment No. 1 to include Part III information in our Form 10-K because we will not file a definitive proxy statement containing such information within 120 days after the end of the fiscal year covered by the Original 10-K. In addition, this Form 10-K/A deletes the reference on the cover of the Original 10-K to the incorporation by reference of portions of our proxy statement into Part III of the Original 10-K and corrects exhibits 10.41 and 10.44. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), this Form 10-K/A also contains certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. Because no financial statements have been included in this Form 10-K/A and this Form 10-K/A does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. Except as described above, this Form 10-K/A does not modify or update disclosure in, or exhibits to, the Original 10-K. Furthermore, this Form 10-K/A does not change any previously reported financial results. Information not affected by this Form 10-K/A remains unchanged and reflects the disclosures made at the time the Original 10-K was filed.    
ICFR Auditor Attestation Flag true    
Document Annual Report true    
Document Transition Report false