Nevada led 45-39 with 16:50 left before going on a 10-2 run over the next four minutes.
Ray Kraemer's 3-pointer with about 12 minutes to go put the Wolf Pack up 55-41. Idaho could get no closer than nine points the rest of the way.
The Vandals led 21-11 midway through the first half before the Wolf Pack responded with a 25-9 run to close out the period leading 36-30. Johnson had 10 points during the run and Babbit had 8.