DOCUMENT AND ENTITY INFORMATION (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Jul. 06, 2012	Oct. 31, 2011
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		47,074,942
Document Type	10-K
Amendment Flag	false
Document Period End Date	Apr. 30, 2012
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2012
Entity Well-Known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 18.7