Nationwide International Small Cap Fund S000055867 [Member] Class A Shares C000175982 [Member] Class R6 Shares C000175984 [Member] Institutional Service Class Shares C000175985 [Member] Eagle Class Shares C000279607 [Member] MSCI EAFE® Index (The Index does not pay sales charges, fees, expenses or taxes.)[Member] MSCI EAFE® Small Cap Index (The Index does not pay sales charges, fees, expenses or taxes.)[Member] Equity Securities Risk [Member] Market Risk [Member] Smaller Company Risk [Member] Foreign Securities Risk [Member] Foreign Currencies [Member] Emerging Markets Risk [Member] Country or Sector Risk [Member] Growth Style Risk [Member] Value Style Risk [Member] Derivatives Risk [Member] Currency Exposure [Member] Futures [Member] Swaps and Forwards [Member] Liquidity Risk [Member] Selection Risk [Member] Portfolio Turnover Risk [Member]