Document And Entity Information - shares	9 Months Ended
	Jan. 31, 2019	Mar. 14, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jan. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	CHAMPIONS ONCOLOGY, INC.
Entity Central Index Key	0000771856
Current Fiscal Year End Date	--04-30
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Trading Symbol	CSBR
Entity Common Stock, Shares Outstanding		11,615,272