A document validating/stacking device is provided that has a validator 1 provided with a swingable rocker 10 formed with a head 16 and a stacker 2 detachably attached to validator 1. Stacker 2 comprises an X-linkage 20 having a driver arm 41 that is separably pushed by head 16 in the same rotational direction as head 16 swings to expand X-linkage 20, to thereby move pusher plate 18 from the initial position to the extended position and to stow the document within interim chamber 24 into storage 7.