1. A dishwasher appliance, comprising: a wash chamber for receipt of articles for washing; a pump for providing fluid flow for cleaning the articles; and a diverter for selectively controlling the fluid flow to a plurality of spray assemblies, the diverter defining an axial direction, a radial direction, and a circumferential direction, the diverter comprising: a housing; a fluid inlet for receiving fluid flow from the pump; a first plurality of fluid outlets defined through the housing, each of the first plurality of fluid outlets being disposed at a first radial distance along the radial direction, and a second plurality of fluid outlets defined by the housing, each of the second plurality of fluid outlets being disposed at a second radial distance along the radial direction, wherein at least one of the first plurality of fluid outlets and the second plurality of fluid outlets is circular; and a valve positioned within the housing, the valve being rotatable along the circumferential direction, the valve comprising: a disk defining a first set of apertures disposed at the first radial distance along the radial direction and a second set of apertures disposed at the second radial distance along the radial direction, wherein at least one of the first set of apertures and the second set of apertures is oblong and defines a constant cross section along a thickness of the disk; and a positioning assembly configured to rotate the disk to selectively control the flow of fluid by aligning at least one of the first set of apertures and the second set of apertures with at least one of the first plurality of fluid outlets and the second plurality of fluid outlets, wherein the first radial distance is different than the second radial distance.