Idaho Code § 43-1004

The board of directors, at the time mentioned in said notice or at such other time to which the hearing may be adjourned, shall hear the petition and all the objections thereto. The failure of any person to appear and object shall be taken as an assent on his part to a change of the boundaries of the district as prayed for in said petition, or to such a change thereof as will include a part of said lands.