American Idol (season 10) rating in the Adults 18–49 demographic. The show's success helped Fox network achieve the longest winning streak in broadcast history of seven consecutive season in the Adult 18–49 demo. American Idol (season 10) The tenth season of "American Idol" premiered on January 19, 2011 and concluded on May 25, 2011, on the Fox television network. The show underwent a number of changes from the ninth season, including the return of Nigel Lythgoe as executive producer. Randy Jackson returned as judge for his tenth season while Jennifer Lopez and Steven Tyler joined the judging panel following the departures of Simon Cowell,
American Idol (season 9) the show as the new permanent fourth judge for the rounds held at CBS Television City for Hollywood Week and thereafter, onto the live shows. In addition, Simon Cowell announced shortly before the ninth season began that it would be his last season on "American Idol". Cowell left the show to begin preparations for an American version of his talent show "The X-Factor". Also, DeGeneres announced on July 29, 2010 that she would not return to the judging panel because it was not the right fit for her. DioGuardi would also not return as a judge for the tenth season