‘American Idol’ topped Tuesday’s ratings as the top 11 finalists, above, performed to 23.8 million viewers.

Fox, which again turned its entire night over to “American Idol,” crushed the competition on Tuesday, beating the other major nets combined. NBC’s “Parenthood” carried the final hour in demos, rising as expected when CBS’ “The Good Wife” went to repeat.

According to preliminary nationals from Nielsen, “American Idol” averaged an 8.3 rating/23 share in adults 18-49 and 23.8 million viewers overall from 8 to 10 p.m., rising week to week and year to year. As the top 11 finalists performed, Fox beat ABC, CBS and NBC combined in the time period among adults 18-49 (8.3 to 7.8).

NBC ran second in demos behind “The Biggest Loser” (3.0/8 in 18-49, 8.0 million viewers overall), which grew week to week, and “Parenthood” (2.7/8 in 18-49, 7.1 million viewers overall), which had its best delivery in three weeks and rose a healthy 17% week to week to dominate its hour in all under-55 adult categories. “Parenthood” took advantage of CBS airing a repeat of fellow rookie drama “The Good Wife” (1.4/4 in 18-49, 8.0 million viewers overall), with which it likely shares some potential female audience.

ABC again claimed the night’s top scripted program in demos with “Lost” (projected 4.0/10 in 18-49, 9.3 million viewers overall from 9 to 10:06 p.m.) after placing fourth in the evening’s opening hour with a repeat of the previous week’s “Lost” (1.5/4 in 18-49, 4.2 million viewers overall). Closing things out for the net was the special “V: The Arrival” (projected 1.6/4 in 18-49, 4.5 million viewers overall from 10:06 to 11 p.m.) in advance of the sci-fi drama’s return next week.

CBS didn’t do much demo-wise with its repeat lineup, which included “NCIS” (2.2/7 in 18-49, 12.8 million viewers overall) and “NCIS: Los Angeles” (2.0/5 in 18-49, 11.2 million viewers overall), although both still drew sizable overall crowds.

And CW remains a non-factor with its combo of “90210” (0.7/2 in 18-49, 1.6 million viewers overall) and “Melrose Place” (0.5/1 in 18-49, 1.0 million viewers overall).

Preliminary 18-49 averages for the night: Fox, 8.3/23; NBC, 2.9/8; ABC, 2.4/7; CBS, 1.9/5; Univision, 1.3/4; CW, 0.6/2.

In total viewers: Fox, 23.8 million; CBS, 10.7 million; NBC, 7.7 million; ABC, 6.1 million; Univision, 3.3 million; CW, 1.3 million.