Detecting "Idleness"

Is there any way to do it? I'm assuming its an orderstring or something similar, but my trigger that detected if the units current order was equal to stop didnt work. Any help? I want to have it so my worker units always default move to a certain spot unless their repairing or building, i've got the trigger that cancels orders to them, but i cant detect if their idle or not.

just change the worker to a normal unit. to do this, find the worker and change his class type (i think it is) from worker to Nothing.

I believe that there is an orderstring called "idle".

yep :) check every second or something if units current order is "idle".

*slaps head* damnit, now why didnt i think of that. Thanks.