Idaho Code § 20-506
If during the pendency of a criminal or quasi-criminal charge against any juvenile in any other court, it shall be ascertained that the juvenile was under the age of eighteen (18) years at the time of committing the alleged offense, except where such juvenile has left the state, or where said charge is that such juvenile is a juvenile traffic, beer, wine or other alcohol or tobacco violator, or is within the purview of section 20-508(1)(a) or (1)(b), Idaho Code, it shall be the duty of such court forthwith to transfer the case, together with all the papers, documents and testimony connected therewith, to the court having jurisdiction over the juvenile with respect to the offense charged. The court making such transfer shall order the juvenile to be taken forthwith to the court to which the transfer is being made or place of detention designated by the court or shall release the juvenile to the custody of some suitable person to be brought before the court at a time designated. The court to which the case is transferred shall then proceed as provided in this act.
Idaho Code § 20-506