The crowds shouldn't be too bad, since you're coming right after the summer/Labor Day crowds. It's actually one of the better times to come.
Keep in mind, however, that weekends always draw the locals to Disneyland, so if you choose to go on a weekend, you'll probably be facing some crowds no matter what. Weekdays are definitely better. Still, like I said, this time of year is one of the best, so it shouldn't be too bad.
I'd have to agree with Avalanche. The locals come out on the weekends, i know, cuz thats when i would usually go and i live in san diego. But it shouldnt be as bad as a summer weekend, and hopefully the summer-y weather will be over.