Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2017	Jul. 15, 2017	Oct. 31, 2016
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	Smaller Reporting Company
Trading Symbol	CSBR
Entity Common Stock, Shares Outstanding		10,982,159
Document Type	10-K
Amendment Flag	false
Document Period End Date	Apr. 30, 2017
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2017
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 17.3