ID and $this->uri->segment(n) returning nothing

[eluser]jstnjns[/eluser]
I can't seem to get the ID value from my URI segment or segment from URI lib to register.

Requested URI:
http://localhost/events/detail/1

Controller

Code:

class Events extends Controller {
    function Events()
        {
        ...
        }

    function detail($id)
    {
        echo $id;
        echo $this->uri->segment(3);
    }
}

I'm autoloading the URI library, but that shouldn't have anything to do with $id.. I'm getting these errors:

Missing argument 1 for Events::detail()

Undefined variable: id

Not sure what could be going on here. Don't have any non-standard $routes[].. Upgraded system to 1.7.1, but that didn't help. Can provide source if needed.

Thanks in advance!