| Cover Page | Jul. 22, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 22, 2021 |
| Entity Registrant Name | CHAMPIONS ONCOLOGY, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-11504 |
| Entity Tax Identification Number | 52-1401755 |
| Entity Address, Address Line One | 1 University Plaza, Suite 307 |
| Entity Address, City or Town | Hackensack |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07601 |
| City Area Code | 201 |
| Local Phone Number | 808-8400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000771856 |
| Amendment Flag | false |
