That's just slang! You can't actually steal an idea!
Once someone has made it possible for the idea to be shared -- even if they wrote it down and locked it in their safe -- then the information is already potentially accessible!
Breaking-in to someone's home to steal the paper you wrote your idea on is explicitly the theft, and getting the idea written on it is a side-effect.
Once someone has made it possible for the idea to be shared -- even if they wrote it down and locked it in their safe -- then the information is already potentially accessible!
Breaking-in to someone's home to steal the paper you wrote your idea on is explicitly the theft, and getting the idea written on it is a side-effect.