American Idol (season 9) spots of the season. Viewership for the Tuesday episodes averaged 22.974 million, while the Wednesday episodes averaged 21.951 million. American Idol (season 9) The ninth season of "American Idol" premiered on January 12, 2010 and concluded on May 26, 2010 on Fox. Simon Cowell, Randy Jackson and Kara DioGuardi returned to the judging panel. Ellen DeGeneres joined the panel as a replacement for Paula Abdul after guest judges filled in during the auditions. Idol Gives Back also returned for the season and was held on April 21, 2010, during the top seven results show. The top 24 semi-finals format used
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