Cover - shares	3 Months Ended
	Jul. 31, 2022	Sep. 09, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jul. 31, 2022
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, 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 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 Common Stock, Shares Outstanding		13,522,441
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000771856
Current Fiscal Year End Date	--04-30