The country singer, 44, was “Switzerland” during the incident, Kidman added with a laugh.
Urban put a positive spin on what was clearly an intense confrontation, saying it’s good to have people who care deeply about what they’re working on.
“I love it, I gotta say,” he said. “I love working with passionate people. I love artists. Everyone just sort of expressing themselves. It’s a very alive and very invigorating work environment. A lot of passion.”
He added jokingly: “Randy’s the craziest – so, you know, unpredictable.”
A friend of Carey’s told PEOPLE that she’s “not going to let this faze her.” And Idol host Ryan Seacrest has said there are bound to be disagreements between the judges, who are “very different individuals … with different perspective and different opinions.”