Among the four schools of Buddhism, Sarvastivada1 and Sautrantika did not maintain any idealistic viewpoints at all, neither did the Madhyamaka (Middle Way) school of the Mahayana tradition.

 

The Yogachara (Consciousness Only) school of Mahayana had a number of sects, of those only one posited a small portion of its views that was somewhat similar to that of idealism.

- Quote from The Right View, "Buddhism—the Definition"