Idaho Code § 5-326
Judgments and decrees rendered in actions or proceedings when persons have been made parties and served by publication of summons, shall have the same effect in all respects as if such persons had been made parties by their own proper names, and had been served by publication and mailing of summons according to the statutes in such case made and provided. If in such action or proceeding persons are made parties by the designation of unknown heirs as aforesaid, the judgment or decree shall be conclusive as to all heirs of such deceased party. When in any action or proceeding persons are made defendants by the designation of unknown devisees as aforesaid, the judgment or decree in such proceeding shall be conclusive as against all devisees of such deceased person. When in any action or proceeding persons are made defendants by the designation of unknown owners as aforesaid, the judgment or decree rendered in such action or proceeding shall be conclusive as against the world, including all contingent interests in the controversy and persons not in being who may have an interest or contingent interest therein.
Idaho Code § 5-326