Relationship of Tables Laravel

I have a bank with the following relationships:

I'd like to bring the Menu relationship to the Perfil of the user.

In tiker I take the following steps:

$user = App\Models\User::find(1);
$perfil = $user->perfil;
$itemMenu = $perfil->itemMenu;

When I get the Menu, I can not

$menu = $itemMenu->menu;

In my class User.php

class User extends Authenticatable implements Transformable
{
    use TransformableTrait;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name',
        'email',
        'password'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password',
        'remember_token'
    ];

    public function perfil()
    {
        return $this->belongsTo('App\Models\Perfil','id_perfil');
    }
}

In class Perfil

class Perfil extends Model implements Transformable
{
    use TransformableTrait;

    protected $table = 'perfil';

    /**
     * The primary key for the model.
     *
     * @var string
     */
    protected $primaryKey = 'id_perfil';

    protected $fillable = [
        'id_perfil',
        'no_perfil'
    ];

    public function itemMenu()
    {
        return $this->belongsToMany('App\Models\ItemMenu', 'perfil_item_menu', 'id_perfil', 'id_item_menu');
    }    
}

Class Menu

    class Menu extends Model implements Transformable
    {
        use TransformableTrait;

        protected $table = 'menu';

        /**
         * The primary key for the model.
         *
         * @var string
         */
        protected $primaryKey = 'id_menu';

        protected $fillable = [
            'id_menu',
            'no_menu',
            'ic_menu'
        ];

        public function itemMenu()
        {
            return $this->hasMany('App\Models\ItemMenu', 'id_menu');
        }

        public function perfil()
        {
            return $this->belongsToMany('App\Models\Perfil', 'perfil_menu', 'id_menu', 'id_perfil');
        }
    }

Class ItemMenu

class ItemMenu extends Model implements Transformable
{
    use TransformableTrait;

    protected $table = 'item_menu';

    /**
     * The primary key for the model.
     *
     * @var string
     */
    protected $primaryKey = 'id_item_menu';

    protected $fillable = [
        'id_item_menu',
        'id_menu',
        'no_item_menu'
    ];

    public function menu()
    {
        return $this->belongsTo('App\Models\Menu', 'id_menu');
    }

    public function perfil()
    {
        return $this->belongsToMany('App\Models\Perfil', 'perfil_item_menu', 'id_item_menu', 'id_perfil');
    }
}