Nearly 22 million viewers tuned in to Idol to find out which two singers made it to next week's finale. The hourlong results show also drew a 6.3 rating in the adults 18-49 demo.
The Mentalist's two-hour finale, featuring the highly anticipated reveal of Red John, was the most-watched scripted show of the evening. The CBS drama averaged 14.11 million viewers and a 2.8 demo rating.
The Office, which welcomed guest stars Will Arnett, James Spader, Ray Romano, Ricky Gervais and Catherine Tate, was the top-rated scripted series of the night. The season finale nabbed a 3.9 demo rating, with 7.29 million viewers tuning in.
Against Idol, The Big Bang Theory attracted 11.3 million viewers, followed by Rules of Engagement (8.83 million) at 8:30/7:30c. ABC was third in the timeslot with the spring finale of Wipeout (5.6 million).