Been ~1 year here waiting on the criminal rehabilitation to go through. Was hoping it would go quick as they didn't ask for it until the very end of the PR application and had heard that they sometimes speed those up.
As far as documentation, had to get a background check from every state I've been to since I was 18. Official-mailed-to-you versions, the ones you can pay for and see on the internet don't count. Had to wait on all those. And like other people have said, printed out the local laws, found the Canadian equivalent, then attached those as well.
They also asked for a written explanation of anything that showed up.
This was from a couple misdemeanors from 15 years ago. So take that 10 year thing with a grain of salt.