Should I repot this?

[rcamp]

Hello,

Two weeks ago I bought this orchid from a grocery store. It's generally healthy, but I noticed some roots seem rotten. You can see a few in the middle two photos. The aerial roots look a little odd to me, but maybe they are fine. There were some rotten roots coming out of the bottom of the pot, too. These I trimmed away.

The roots were pretty green when I bought it, so I've been watering sparingly. Should I re-pot because of the rotten roots or just ignore them?