| Document and Entity Information | Nov. 17, 2023 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 17, 2023 |
| Entity Registrant Name | CytoDyn Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 000-49908 |
| Entity Tax Identification Number | 83-1887078 |
| Entity Address, Address Line One | 1111 Main Street |
| Entity Address, Adress 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001175680 |
| Amendment Flag | false |
