Idris Elba has again teased the idea of turning his cult BBC detective drama “Luther” into a feature, more than a year after Season 5 aired on British television.The actor told a press junket for Season 3 of his Sky comedy “In The Long Run” that there are no “formal plans” for another “Luther” series, according to Sky News.But Elba added: “I’ve made it very clear that I’d like to see ‘Luther’ come back as a film.