Net Assets Investment Company, Portfolio Turnover C000095791 [Member] Empower Conservative Profile Fund - Class L [Member] C000155780 [Member] Empower Conservative Profile Fund - Institutional Class C000069831 [Member] Empower Conservative Profile Fund - Investor Class C000095790 [Member] Empower Moderately Conservative Profile Fund - Class L C000155779 [Member] Empower Moderately Conservative Profile Fund - Institutional Class [Member] C000069830 [Member] Empower Moderately Conservative Profile Fund - Investor Class C000095789 [Member]  Empower Moderate Profile Fund - Class L C000155778 [Member] Empower Moderate Profile Fund - Institutional Class C000069829 [Member] Empower Moderate Profile Fund - Investor Class C000155777 [Member] Empower Moderately Aggressive Profile Fund - Institutional Class C000069828 [Member] Empower Moderately Aggressive Profile Fund - Investor Class C000155775 [Member]  Empower Aggressive Profile Fund - Institutional Class C000069826 [Member] Empower Aggressive Profile Fund - Investor Class Investment Type [Axis] Large Cap Equity [Member] International Equity [Member] Mid Cap Equity [Member] Small Cap Equity [Member] Real Estate Equity [Member] Empower Large Cap Value Fund Institutional Class [Member] Empower Large Cap Growth Fund Institutional Class [Member] Empower International Value Fund Institutional Class [Member] Empower Mid Cap Value Fund Institutional Class [Member] Empower International Growth Fund Institutional Class [Member] Empower T. Rowe Price Mid Cap Growth Fund Institutional Class [Member] Empower Emerging Markets Equity Fund Institutional Class [Member] Empower Small Cap Value Fund Institutional Class [Member] Empower Real Estate Index Fund Institutional Class [Member] Empower Small Cap Growth Fund Institutional Class [Member] Bond [Member] Fixed Interest Contract [Member] Empower of America Contract [Member] Empower Multi-Sector Bond Fund Institutional Class [Member] Empower Global Bond Fund Institutional Class [Member] Empower U.S. Government Mortgage Securities Fund Institutional Class [Member] Empower Core Bond Fund Institutional Class [Member] Empower Short Duration Bond Fund Institutional Class [Member] Empower Inflation-Protected Securities Fund Institutional Class [Member] Empower High Yield Bond Fund Institutional Class [Member]