LANSING, Mich. (AP) — Michigan Gov. Rick Snyder's administration said Wednesday it plans to save the state money by requiring unionized state workers to take at least four unpaid furlough days off and by introducing legislation requiring them to contribute to their defined benefit retirement plans if they want to keep them.

It also plans to close one prison and look into privatizing another, cut 367 vacant positions and refinance debts issued by the State Building Authority.

The governor wants state workers to agree to $145 million in concessions in the budget year that starts Saturday. But a coalition of state employee unions argues that the state can save as much as $170 million, without requiring further sacrifices from state workers, by requiring state vendors to pay more and by cutting the number of managers in state government.