Fox cruised to a primetime victory Wednesday behind “American Idol,” topping “Survivor”-led CBS.

“American Idol” (3.2 rating/9 share in 18-49, 12.2 million viewers overall) slipped off the five-week high it established last week but still topped “Survivor” (2.7/8, 9.8 million) at 8 p.m., according to preliminary nationals from Nielsen. NBC’s “Dateline” (1.3/4, 5.5 million – a three-week high) finished third in the timeslot, followed by ABC sitcom repeats “The Middle” (1.2/4, 4.7 million) and “Modern Family” (1.4/4, 4.4 million) and the CW’s new episode of “Arrow” (1.0/3, 3.1 million, best since Feb. 27).

“Idol” had an even easier time of it at 9 p.m., going from a 3.0 rating to a 3.4 while topping NBC’s “Law & Order: SVU” (1.8/5, 7.2 million)  another “Modern Family” (1.8/5, 5.3 million in its usual time period), the Alphabet net’s “How To Live with Your Parents” (1.5/4, 4.8 million), CBS’ “Criminal Minds” repeat (1.5/4, 6.0 million) and the CW’s “Supernatural” (1.0/3, 2.4 million). Coming off two consecutive repeats, “SVU” generated its best numbers since Jan. 9, while “Supernatural” had its No. 2 performance of the season.

In a battle of reruns at 10 p.m., CBS’ “CSI” (1.5/4, 7.6 million) finished ahead of NBC’s “Chicago Fire” (1.0/3, 4.1 million) and ABC’s “Nashville” (0.8/2, 3.0 million).

Meanwhile, in latenight, ABC’s “Jimmy Kimmel Live” took advantage of reruns for NBC’s “The Tonight Show with Jay Leno” and CBS’ “The Late Show with David Letterman” last week to post its best 18-49 numbers since its January premiere in the pre-midnight timeslot. “Leno” still led “Kimmel” for the week in total viewers and key demos, however.

After 15 weeks against each other, “Leno” leads “Kimmel” in 18-49 with 1.02 million viewers to 928,000, with “Letterman” at 868,000. On Wednesday, “Leno” (2.5/7 in households) edged “Letterman” (2.4/6)  while “Kimmel” (1.7/5) ran a more distant third, as measured in Nielsen’s 56 metered markets.

Preliminary 18-49 averages for the night: Fox 3.2/9, CBS 1.9/5, Univision 1.5/4, NBC 1.4/4, ABC 1.3/4, CW 1.0/3.

In total viewers: Fox 12.2 million, CBS 7.8 million, NBC 5.6 million, ABC 4.2 million, Univision 3.5 million, CW 2.7 million.