Randy Jackson (centre) is embraced by Mariah Carey (left) and Nicki Minaj as he finishes his final season as a judge during the finale of American Idol on May 16. Photo: Phil McCarten/Reuters

Pop singer Mariah Carey and rapper Nicki Minaj will leave American Idol after just one season as judges on the singing contest show, following long-time judge Randy Jackson.

“Thank you American Idol for a life-changing experience! Would not trade it for the world! Time to focus on the music!!!” Minaj wrote on her Twitter page.

Carey’s departure was also announced on Twitter by her public relations firm PMK BNC, which said the singer “says goodbye 2 idol” before a world tour.

Carey, 43, joined the judging panel with Minaj, country singer Keith Urban and Jackson, a music producer, for the show’s 12th season.

Carey reportedly earned €13.8 million, Minaj €9 million and Urban €6 million for the season.

Carey and Minaj, 30, grabbed headlines for their on-camera arguments and off-camera feuding, with Carey saying she had hired extra security following threats reportedly made by Minaj.

Carey and Minaj, 30, grabbed headlines throughout the season for their on-camera arguments and off-camera feuding

Despite the added star power of Carey, Minaj and Urban, the show’s ratings slumped to the lowest in 12 seasons, with the May 16 season finale of Idol drawing 14.2 million to see vocal powerhouse Candice Glover win the competition.

Fox released statements following both judges’ announcements.

“Mariah Carey is a true global icon and we feel extremely fortun-ate that she was able to bring her wisdom and experience to the American Idol contestants this season,” Fox said.

“Nicki Minaj is a superstar who brought a level of honesty and passion to American Idol and who had a tremendous positive impact on so many contestants this season. We understand and respect her decision and wish her the best.”