It's probably not new. Just enjoy the thought "won't it be cool when somebody starts a company that does X" and realize that you are not that person (skill / life stage mismatch).
But you could also develop the idea quietly on the side while in school. If not the tech, then the legal aspects and some market and competitive research. Then if the opportunity is still not taken by others in a couple years, do more.
Also you should read some lists of business/tech ideas others have already had. There are plenty of such lists out on the interwebs. For example pet sitter for after you die, ok, whatever. If you find your idea on these lists, that tells you something... maybe there are better ideas. But if you don't, the converse is not necessarily true (it doesn't mean your idea is good).