Idaho Code § 32-802
The district courts of the several judicial districts of this state shall have jurisdiction of actions for divorce under the provisions of this chapter; and such action shall be brought in the county of this state in which the plaintiff resides. And the court in which such action is about to be commenced shall, upon the filing by the plaintiff of a petition, duly verified, showing that a cause of action exists under this chapter, appoint some person to act as guardian of such insane person in such action, and the summons and complaint in such action shall be served upon the defendant by delivering a copy of such summons and complaint to such guardian, and by delivering a copy thereof to the county attorney of the county in which such action is brought.
Idaho Code § 32-802