As an aside, I was surprised to find that that article, which I wrote a long time ago, was the fourth most-read article on Science Careers in 2012. Damn.
I was at a career event at about the same time--I believe it was the first HHMI/BWF Lab Management course--when someone asked a similar question, about revealing too much and having your ideas scooped. The response from a very senior, very well-known scientist (if I could remember who it was I'd tell you, but all I can remember now was that it was someone impressive) was something like, "most faculty have more ideas than they have time to pursue. Don't worry about having your ideas stolen."
Knowing what I know now, 10 years later, I realize that her perspective (yeah, I also remember that it was a 'her') was a little naive. Just because she had more ideas than she had time to pursue--just because SHE would never be interested in stealing your idea--doesn't mean there aren't a few folks out there with impoverished scientific imaginations.
Still, I think you're best off not to worry about the risk. Jut go in there and present your ideas.
OK, so what about the level of detail? If you're writing this for a research university hiring committee, provide enough information to be convincing. Don't hold back on detail. On the other hand, make sure it's clear that you get the big picture, too--that you understand why it matters and how it connects to other work being done in the field.
Good luck. Let us know how it turns out.
Jim Austin, Editor