LP2954A: no clear definition of what max output voltage can be present in the lack of an input voltage

The datasheet states that the output voltage can be programmed from 1.23 to 29 volts.  In section 7.3.3 (Output Isolation) the following is stated: "The regulator output can be left connected to an active voltage source (such as a battery) with the regulator input power turned off, as long as the regulator ground pin is connected to ground. If the ground pin is left floating, damage to the regulator can occur if the output is pulled up by an external voltage source."  So my question is what is the max voltage that can be left at the output when there is no input voltage.  An absolute max rating if you will.