A carton decasing system for removing stacks of cartons or carton blanks from cases or containers includes a case infeed conveyor on which the cases with the cartons or carton blanks stacked therein are moved to an inverting assembly. The inverting assembly reorients the cases and places the cases with the cartons stacked therein on a decasing assembly which removes the cases from the stacks of cartons. The stacks of cartons are thereafter conveyed along a magazine conveyor with the stacks of cartons supported by a stack pusher assembly as the cartons are moved to a discharge point at the distal end of the magazine conveyor.