What was the significance of thirty pieces of silver Judas was offered for betraying Jesus?

At Matthew 26:14-15 we read: > Then one of the twelve, who was called Judas Iscariot, went to the chief priests and said, “What will you give me if I betray him to you?” They paid him thirty pieces of silver. I would like to know if the amount of money Judas was paid had any specific significance, or was it a random amount offered for the life of Jesus by the High Priests? What do the Catholic teachings say on the subject ?