Net Assets Investment Company, Portfolio Turnover Empower Real Estate Index Fund - Institutional Class Apartment REITS [Member] Diversified REITS [Member] Government Money Market Funds [Member] Health Care REITS [Member] Hotels REITS [Member] Manufactured Homes REITS [Member] Office Property REITS [Member] Regional Malls REITS [Member] Shopping Centers REITS [Member] Short Term Investments [Member] Single Tenant REITS [Member] Storage REITS [Member] Warehouse/Industry REITS [Member] Welltower Inc REIT [Member] Simon Property Group Inc REIT [Member] Ventas Inc REIT [Member] Digital Realty Trust Inc REIT [Member] Dreyfus Institutional Preferred Government Money Market Fund Institutional Class [Member] Equinix Inc REIT [Member] Extra Space Storage Inc REIT [Member] Prologis Inc REIT [Member] Public Storage REIT [Member] Realty Income Corp REIT [Member] Empower Real Estate Index Fund - Investor Class