+3
Your question isn't exactly clear.
Everyone in the movie business has a great idea for a film and everyone is aggressively looking for them. Trust me, go out to Hollywood and throw a rock.
So technically, you could go to say, beauty school, get your degree as a stylist, go to Hollywood, get a job for a movie shoot, chat up the star during her make-up period, She loves the way you do her hair, once the star is comfortable with you, pitch your idea.
What then?
Do you merely want to sell this one idea? Or do you want a career in the biz?
But to answer your question. The Directors you mentioned have already been burned so many times; they keep 2 or 3 lawyers on retainer, since every time they release a film, inevitably some knucklehead will sue them for 200 million dollars claiming they ripped off their original idea. You'd never even get within a mile of them.