Spread ice cream into crust; spread sherbet over ice cream. Freeze for at least 3 hours. Top with whipped topping. Cover and freeze. At least 30 minutes before serving, remove pie from freezer; arrange oranges on top and sprinkle with coconut.
Graham cracker crust (9 inches): Combine 1-1/2 cups crushed graham cracker crumbs (24 squares), 1/4 sugar and 1/3 cup melted butter. Press onto the bottom and up the sides of an ungreased 9-in. pie plate. Bake at 375 until lightly browned, 8-10 minutes. Cool on a wire rack before filling.