Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2020	Jul. 17, 2020	Oct. 31, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	CHAMPIONS ONCOLOGY, INC.
Entity Central Index Key	0000771856
Current Fiscal Year End Date	--04-30
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Amendment Flag	false
Document Period End Date	Apr. 30, 2020
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 31.0
Entity Common Stock, Shares Outstanding		12,726,728,000,000