v3.26.1
Cover - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2026
Jun. 23, 2026
Sep. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Mar. 31, 2026    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2026    
Current Fiscal Year End Date --03-31    
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    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol XAIR    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 15.5
Entity Common Stock, Shares Outstanding   14,410,621  
Documents Incorporated by Reference None    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Listing, Par Value Per Share $ 0.0001    
Auditor Firm ID 100    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheets of Beyond Air, Inc. (the “Company”) as of March 31, 2026 and 2025, and the related consolidated statements of operations and comprehensive loss, changes in stockholders’ equity, and cash flows for each of the two years in the period ended March 31, 2026, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of Beyond Air, Inc. as of March 31, 2026 and 2025, and the results of its operations and its cash flows for each of the two years in the period ended March 31, 2026, in conformity with accounting principles generally accepted in the United States of America.    
Auditor Name WithumSmith+Brown, PC    
Auditor Location East Brunswick, New Jersey