“American Idol” was off 13% from a week ago but Fox had little trouble dominating the ratings Thursday night, TVbytheNumbers.com reported. With ABC and CBS airing all repeats, NBC was the only rival network with a chance to put up a fight, and it didn’t put up much of one.

Fox finished the night with a 4.4 average rating in adults 18-49 for prime time, well ahead of NBC (2.1 average), CBS (1.8), Univision (1.3) and ABC (1.1). The results were comparable in total viewers, where Fox averaged 15.4 million to 8.5 million for CBS, 4.5 million for NBC, 3.8 million for ABC and 3.2 million for Univision.

At 8 p.m. "Idol" logged a 5.6 average rating in the 18-49 demo, while NBC’s "Community" collected a 1.5. NBC’s fledgling "The Paul Reiser Show" continued to struggle at 8:30, managing a 0.9 average in 18-49. CW’s "Vampire Diaries" had a 1.1 for the hour in the 18-49 demographic.

At 9 p.m. NBC’s "The Office" and "Parks & Recreation" had a 3.3 and a 2.5, respectively, in the 18-49 demographic, while Fox’s "Bones" had a 3.2 in the same demo for the hour. CW’s "Nikita" trailed with a 0.8 in the same demo.

Against all reruns at 10 p.m., two episodes of NBC’s "30 Rock" had a 2.3 and a 2.1, respectively, in the 18-49 demo.