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Organization and Basis of Presentation	12 Months Ended
Organization and Basis of Presentation	Apr. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Background Champions Oncology, Inc. (the “Company”), is engaged in an end-to-end range of research and development technology solutions and services to improve the development and use of oncology drugs. The Company’s TumorGraft Technology Platform is a novel approach to personalizing cancer care based upon the implantation of human tumors in immune-deficient mice. The Company uses this technology, in conjunction with related services, to offer solutions for two consumer groups: Translational Oncology Solutions (“TOS”) and Personalized Oncology Solutions (“POS”). The Company’s TOS business offers a technology platform to pharmaceutical and biotechnology companies using proprietary TumorGraft studies, which the Company believes may be predictive of how drugs may perform in clinical settings. POS assists physicians in developing personalized treatment options for their cancer patients through tumor specific data obtained from drug panels and related personalized oncology services. The Company has two operating subsidiaries: Champions Oncology (Israel), Limited and Champions Biotechnology U.K., Limited. For the years ended April 30, 2020 and 2019, there were no revenues earned by these subsidiaries. Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Company operates in one reportable business segment.