With "American Idol" dominating Thursday night’s ratings, ‘Grey’s Anatomy’ dropped 11% in the 18-49 demo, and "CSI" was down 7% to a series low in the demo, reports TVBytheNumbers.com.

On the positive side of the ledger, "30 Rock" was up 15% in the 18-49 demo, and "Parks & Recreation" was up 9%, the report says. And "Big Bang Theory" was up a tenth of a rating point in the 18-49 demo, the story says.

As for "Idol," the article notes that "revealing the final 24 [contestants] scored a 7.2/20 rating/share in adults 18-49. That’s down 5% from last week’s one hour episode, though for the night overall Fox was about 30% better off than last week due to the extra hour of Idol. It was also ahead of the equivalent telecast last year."