Scans when a PC is 'idle'

I am new to this forum having just gone back to Norton after a number of years. So forgive me if I get things wrong when using this Forum.

I have noticed that Norton informs you that various tasks are undertaken when the PC is idle. My question is that should 'Norton' be engaged, on say, a full scan, even a scheduled one, would it stop scanning if the PC started being used ?