Idaho will drop to the Football Championship Subdivision beginning in 2018 and intends to join the Big Sky Conference, school President Chuck Staben said Thursday. The Vandals will remain at the Football Bowl Subdivision level for the next two seasons as part of the transition to the lower division. The move was expected after the program struggled for a number of years with competitiveness and conference stability at the higher division, and is pending approval from the Idaho State Board of Education.