| Cover | Nov. 10, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 10, 2021 |
| Entity File Number | 001-38892 |
| Entity Registrant Name | Beyond Air, Inc. |
| Entity Central Index Key | 0001641631 |
| Entity Tax Identification Number | 47-3812456 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 900 Stewart Avenue |
| Entity Address, Address Line Two | Suite 301 |
| Entity Address, City or Town | Garden City |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 11530 |
| City Area Code | (516) |
| Local Phone Number | 665-8200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $.0001 per share |
| Trading Symbol | XAIR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
