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Cover - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2024
Jul. 18, 2024
Oct. 31, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Apr. 30, 2024    
Current Fiscal Year End Date --04-30    
Document Transition Report false    
Entity File Number 001-11504    
Entity Registrant Name CHAMPIONS ONCOLOGY, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 52-1401755    
Entity Address, Address Line One One University Plaza    
Entity Address, Address Line Two Suite 307    
Entity Address, Postal Zip Code 07601    
Entity Address, City or Town Hackensack    
Entity Address, State or Province NJ    
City Area Code 201    
Local Phone Number 808-8400    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol CSBR    
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    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 22.0
Entity Common Stock, Shares Outstanding (in shares)   13,593,766  
Documents Incorporated by Reference
Portions of the Registrant’s definitive Proxy Statement for its 2024 Annual Meeting of Shareholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, are incorporated by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0000771856    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024