good riddance
good riddance {n.}
A loss that you are glad about. Often used as an exclamation, and in the sentence "good riddance to bad rubbish". To show that you are glad that something or somebody has been taken or sent away.
The boys thought it was good riddance when the troublemaker was sent home.
When Mr. Roberts' old car was stolen he thought it was good riddance.
Betty thought it was good riddance when her little brother broke his toy drum.
"I'm going and won't come back," said John. "Good riddance to bad rubbish!" said Mary.
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Source: A Dictionary of American Idioms