Net Assets Investment Company, Portfolio Turnover C000155766 [Member] Empower Bond Index Fund - Institutional Class [Member] C000069817 [Member] Empower Bond Index Fund - Investor Class [Member] C000155781 [Member] Empower Core Bond Fund - Institutional Class [Member] C000069832 [Member] Empower Core Bond Fund - Investor Class [Member] C000155784 [Member] Empower Global Bond Fund - Institutional Class [Member] C000069835 [Member] Empower Global Bond Fund - Investor Class [Member] C000155783 [Member] Empower High Yield Bond Fund - Institutional Class [Member] C000069834 [Member] Empower High Yield Bond Fund - Investor Class [Member] C000195600 [Member] Empower Inflation-Protected Securities Fund - Institutional Class [Member] C000195601 [Member] Empower Inflation-Protected Securities Fund - Investor Class [Member] C000155782 [Member] Empower Multi-Sector Bond Fund - Institutional Class [Member] C000069833 [Member] Empower Multi-Sector Bond Fund - Investor Class [Member] C000155765 [Member] Empower Short Duration Bond Fund - Institutional Class [Member] C000069816 [Member] Empower Short Duration Bond Fund - Investor Class [Member] C000155776 [Member] Empower U.S. Government Securities Fund - Institutional Class [Member] C000069827 [Member] Empower U.S. Government Securities Fund - Investor Class [Member] Investment Type [Axis] Aa1 [Member] Aaa [Member] Aa2 [Member] Aa3 [Member] Not Rated [Member] Short Term Investments [Member] Baa3 [Member] Baa2 [Member] A2 [Member] Baa1 [Member] A3 [Member] United States Treasury Note/Bond 4.13% [Member] United States Treasury Note/Bond 3.50% [Member] United States Treasury Note/Bond 3.75% [Member] United States Treasury Note/Bond 4.38% [Member] United States Treasury Note/Bond 4.63% [Member] United States Treasury Note/Bond 5.00% [Member] United States Treasury Note/Bond 4.25% [Member] United States Treasury Note/Bond 3.50% One [Member] United States Treasury Note/Bond 3.50% [Member] United States Treasury Note/Bond 4.13% One [Member] United States Treasury Note/Bond 4.13% [Member] United States Treasury Note/Bond 4.63% One [Member] United States Treasury Note/Bond 4.63% [Member] A1 [Member] Ba1 [Member] Ba3 [Member] B1 [Member] Ba2 [Member] United States Treasury Note/Bond 3.88% [Member] U.S. Treasury Bills 3.54% [Member] Federal Home Loan Bank 3.67% [Member] Goldman Sachs Group Inc 4.15% [Member] Bank of America Corp 6.20% [Member] BAT Capital Corp 4.91% [Member] AutoNation Inc [Member] Medline Borrower LP 3.88% [Member] Boeing Co 6.30% [Member] Federal Home Loan Bank 3.66% [Member] B3 [Member] B2 [Member] CCC, CC, C [Member] Equities [Member] United States Treasury Note/Bond 4.00% [Member] Dreyfus Institutional Preferred Government Money Market Fund Institutional Class [Member] Federal Home Loan Mortgage Corp 5.00% [Member] EchoStar Corp 10.75% Space Exploration Technologies Corp 5.88% [Member] Federal Home Loan Mortgage Corp 5.50% [Member] Beignet Investor LLC 6.58% [Member] U.S. Treasury Inflation Indexed Bonds TIPS 1.88% [Member] U.S. Treasury Inflation Indexed Bonds TIPS 0.13% [Member] U.S. Treasury Inflation Indexed Bonds TIPS 1.88% One [Member] U.S. Treasury Inflation Indexed Bonds TIPS 1.88% [Member] U.S. Treasury Inflation Indexed Bonds TIPS 1.13% [Member] Federal Home Loan Bank 3.70% [Mmember] U.S. Treasury Inflation Indexed Bonds TIPS 0.63% [Member] U.S. Treasury Inflation Indexed Bonds TIPS 2.13% [Member] U.S. Treasury Inflation Indexed Bonds TIPS 1.63% [Member] OCP Ltd 4.87% [Member] Western Digital Corp [Member] Lumentum Holdings Inc [Member] Iron Mountain Inc REIT 6.25% [Member] RR Donnelley & Sons Co 9.50% [Member] Boeing Co [Member] Efesto Bidco SpA Efesto US LLC 7.50% [Member] Kedrion SpA 6.50% [Member] Rain Carbon Inc 12.25% [Member] MPT Operating Partnership LP / MPT Finance Corp REIT 8.50% [Member] UNITED STATES GERMANY JAPAN UNITED KINGDOM MEXICO ITALY FRANCE CANADA COLOMBIA KOREA, REPUBLIC OF AUSTRALIA SPAIN BELGIUM NETHERLANDS LUXEMBOURG Countries [Member] Uniform Mortgage-Backed Security 5.50% [Member] United States Treasury Note/Bond 2.25% [Member] Bundesschatzanweisungen 2.00% [Member] Bundesrepublik Deutschland Bundesanleihe 2.30% [Member] Colombian TES 13.25% [Member] U.S. Treasury Bills 3.65% [Member] Uniform Mortgage-Backed Security 6.50% [Member] U.S. Treasury Bills 3.61% [Member] United States Treasury Note/Bond 4.50% [Member] Uniform Mortgage-Backed Security 6.00% [Member] United States Treasury Note/Bond 2.75% [Member] United States Treasury Note/Bond 1.38% [Member] United States Treasury Note/Bond 1.63% [Member] United States Treasury Note/Bond 0.88% [Member] United States Treasury Note/Bond 3.38% [Member] United States Treasury Note/Bond 0.50% [Member] Fairway Finance Co LLC [Member]