Back in the late 80's I got a DUI and I didn't disclose it to my next employer, which was Sony. The job I got was outside sales so I had to drive as I was on the road all the time. They did not do a license check and never knew about it and as long as I was making my quota I doubt if they would have cared after the fact but they might not have hired ne if they knew in the first place.
Dui is a criminal offence in Canada so it would show up on a criminal check.
I say if they don't ask don't tell.