Shareholder Servicing Fee Additional Other Expenses MFG Core Infrastructure Fund Institutional Class Service Class Market Risks [Member] Common Stocks Risks [Member] Stock Selection Risks [Member] Stapled Securities Risks [Member] REIT Risks [Member] Foreign Securities Risks [Member] Emerging Markets Risks [Member] Currency Risks [Member] Management Risks [Member] Shareholder Ownership and Concentration Risks [Member] Infrastructure and Utilities Concentration Risks [Member] Small- and Medium-Capitalization Company Risks [Member] Large Capitalization Risks [Member] Cybersecurity Risks [Member] MSCI World Index (Net) (reflects no deductions for fees, expenses or taxes) S&P Global Infrastructure Index (reflects no deductions for fees, expenses or taxes) Stock Selection Risks Member Infrastructure And Utilities Concentration Risks Member Currency Risks Member Market Risks Member Small And Medium Capitalization Company Risks Member Management Risks Member Emerging Markets Risks Member Shareholder Ownership And Concentration Risks Member C000108790 Member Large Capitalization Risks Member Common Stocks Risks Member index_ SP_ Global_ Infrastructure_ Index_reflects_no_deductions_for_fees_expenses_or_taxes Member C000167328 Member Foreign Securities Risks Member REITRisks Member S000035417 Member Stapled Securities Risks Member index_ MSCI_ World_ Index_ Net_reflects_no_deductions_for_fees_expenses_or_taxes Member Cybersecurity Risks Member