Seriously?? I always turn Wifi and Bluetooth off when I don't need them. Saves battery life, frees up memory and processor cycles. It just makes sense. Do you leave all your lights and appliances on when your're not at home?
Just going to point out to you that it yeah it will save some battery but very little. Them in idle mode is pretty minor in battery usage.
As for CPU and memory usage chances are it is not even not even measurable. Reason being is it does not turn off that part of the OS. It is just not running. Still loaded in memory and cycle usage would be about the same as if it was on.