Idaho quarterback Nate Enderle hit Eddie Williams with a 3-yard touchdown pass with 2:42 left in the fourth quarter. But San Jose's Jeff Clark snagged the ball on the ensuing onside kick at the Idaho 36, allowing the Spartans (6-3, 4-1 Western Athletic Conference) to run out the clock.
Eden had hit Richmond with a 35-yard touchdown pass late in the third quarter, making the score 30-10 going into the fourth.
Princeton McCarty scored on a 14-yard run for Idaho (2-8, 1-5) with 12:33 left. Tino Amancio hit the extra point, narrowing the Spartans' lead to 30-17.
Ten minutes later, Enderle hit Williams with the 3-yard scoring pass to bring the Vandals within 6 points before their failed onside kick.
Eden was starting in his second game of the year, filling in for Kyle Reed, who was out with a bruised tailbone. He finished 23-of-31 with an interception and two touchdown passes.
Richmond finished with eight catches for 138 yards and two touchdowns. Yonus Davis led the San Jose ground attack with 10 carries for 49 yards.
For the Vandals, Enderle finished 10-of-19 for 138 yards with one interception and two touchdown passes.
Deonte Jackson had 10 carries for 78 yards for Idaho, and Max Komar had four catches for 69 yards.
Joey Counts scored on a 1-yard run on fourth-and-goal with 2 seconds left to give Montana a 38-35 victory over four-time defending FCS champion North Dakota State on Saturday.
Transfer Vernon Adams will be the starting quarterback when Oregon begins its season against Eastern Washington on Sept. 5.
Tim Beckman is threatening legal action after Illinois fired him as football coach Friday amid allegations of influencing medical decisions and pressuring players to play hurt.
LSU offensive coordinator Cam Cameron revealed in a post-practice news conference that he has been treated for prostate cancer but plans to coach this season.
The woman who accused former Baylor defensive end Sam Ukwuachu of raping her in 2013 has hired a Title IX law firm to represent her in potential civil litigation.
Arkansas tight end C.J. O'Grady has been arrested by Fayetteville police and charged with driving while intoxicated and being a minor in possession of alcohol.