Idaho Constitution Art. IV, § 10. Veto power

Every bill passed by the legislature shall, before it becomes a law, be presented to the governor. If he approve, he shall sign it, and thereupon it shall become a law; but if he do not approve, he shall return it with his objections to the house in which it originated, which house shall enter the objections at large upon its journals and proceed to reconsider the bill. If then two-thirds of the members present agree to pass the same, it shall be sent, together with the objections, to the other house, by which it shall likewise be reconsidered; and if approved by two-thirds of the members present in that house, it shall become a law, notwithstanding the objections of the governor. In all such cases the vote of each house shall be determined by yeas and nays, to be entered on the journal. Any bill which shall not be returned by the governor to the legislature within five days (Sundays excepted) after it shall have been presented to him, shall become a law in like manner as if he had signed it, unless the legislature shall, by adjournment, prevent its return, in which case it shall be filed, with his objections, in the office of the secretary of state within ten days after such adjournment (Sundays excepted) or become a law.