Solid detergent compositions according to the present invention include at least one alkali metal silicate, at least one polycarboxylic acid, at least one saccharide or sugar alcohol and water. Suitable saccharides include sucrose, fructose, inulin, maltose and lactulose, and may be present in the composition in a concentration of at least 0.5 wt %. Compositions according to certain embodiments form stable solid block detergent compositions that do not swell significantly even when subjected to elevated temperatures.