Toggle Ignore in System Update

I am hoping I am just over-thinking this but I don't see the actual answer out there.... While getting a system update to a baseline state, if I toggle devices that are offline to be ignored then is that just for that schedule or forever. What I am trying to determine is whether or not those machines would get the SU pushed to them when they came back online since the zone would then be baselined to a version newer than what they have installed? Or will those devices ignore that system update going forward as well?

Thanks in advance.