American Idol top producer to leave.

Niegel Lythgoe who has been the top producer of the prime-time juggernaut "American Idol" on Fox, is leaving the show to focus on a new joint venture with Simon Fuller , the creator and acerbic tongued judge on the show. Beside the new joint-venture, he said he plans to devote more time to another Fox reality series in which he is a creator, an executive producer and a judge, "So You Think You Can Dance" . He said to having plans to promote local versions of that show in other countries.