Idaho Rules of Civil Procedure Rule 84(e). Method and Scope of Review.
(1) Method of review. When judicial review is authorized by statute, and statute or law does not provide the procedure or standard, judicial review of agency action shall be based upon the record created before the agency. When the authorizing statute provides that the district court may take additional evidence itself upon judicial review, the district court may order the taking of additional evidence upon its own motion or motion of any party to the judicial review. When the statute provides that review is de novo, the appeal shall be tried in the district court on any and all issues, on a new record.
(2) Scope of review. The scope of judicial review on petition from an agency to the district court shall be as provided by statute.