How to get last inserted id from insert method laravel 5.1

I have inserted value in database from the Model, here is the code:

Controller:

class MovieController extends Controller
{   
    /**
     * Create a new movie model instance.
     *
     * @return void
     */
    public function __construct(MovieModel $movie){
        $this->movie = $movie;
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(MovieRequest $request)
    {               
        if($this->movie->createMovie($input)){
            return Redirect::back()->with('message', '<strong>' . $input['name'] . '</strong> movie has been created');
        }
    }
}

Model:

class Movie extends Model
{   
    public function createMovie($input) {
        return $this->insert($input);   // I need to return last inserted id here
    }

}

By using this insert method how can I get the last inserted id?

via Chebli Mohamed