As soon as the baby is born, suppose she has a girl, she immediately wants to get a boy the next time. A similar situation develops when someone does not get his wishes fulfilled. Here also he develops a certain type of detachment. All these attitudes are temporary. Permanent detachment is something quite different.
Permanent detachment is an intense detachment, as opposed to dull or weak detachment.
For example, a person may have resolved to go on a pilgrimage to one of the holy places in India, but then there may be a strong tendency to postpone it to the next month. If it is a matter of doing something good such as going on a pilgrimage, one will tend to postpone it. On the other hand, if it is a matter of doing something bad, one prefers to do it right on the spot, without wasting any time. People usually will not make very great efforts to perform good deeds. This may be seen as a type of weak detachment which tends to postpone implementing good resolutions and performing good actions.