oef_RiskReturnHeading

Summary Section

oef_ObjectivePrimaryTextBlock

The investment objective of the MFG Global Sustainable Fund (formerly, the Frontier MFG Global Sustainable Fund) (the “Fund”) is to seek attractive risk-adjusted returns over the medium- to long-term while reducing the risk of permanent capital loss.

Expense Narrative [Text Block]

oef_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and example below.

Operating Expenses Caption [Optional Text]

oef_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

oef_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The “Total Annual Fund Operating Expenses” and “Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement” for Service Class shares do not correlate to the “Ratio of expenses to average net assets” figures in the Financial Highlights section of this Prospectus because Service Class shares accrued shareholder servicing fees in the amount of 0.10% for the fiscal year ended June 30, 2025.

Expense Example Narrative [Text Block]

oef_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the shares of the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The fee waiver/expense reimbursement arrangement included in the table above is reflected only through October 31, 2026.

Portfolio Turnover [Heading]

oef_PortfolioTurnoverHeading

Portfolio Turnover.

Portfolio Turnover, Rate

oef_PortfolioTurnoverRate

55.00%

Strategy Narrative [Text Block]

oef_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of issuers listed on U.S. and international stock exchanges that meet the criteria for environmental, social and governance (“ESG”) and low carbon investments of the Fund’s subadviser, Magellan Asset Management Limited doing business as Magellan Investment Partners (formerly MFG Asset Management) (“Magellan Investment Partners”). Equity securities in which the Fund will invest as a principal investment strategy consist of common stocks, American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”). In selecting investments for the Fund, Magellan Investment Partners reviews a broad spectrum of ESG issues for their materiality of impact on the future earnings and risks of companies. Magellan Investment Partners considers amongst other things and where applicable: environmental issues, such as climate change and pollution; social issues, such as human rights and health and safety; and corporate governance issues, such as governance and compensation structures. The choice of ESG factors for any company will vary by industry and company. In addition, Magellan Investment Partners incorporates a proprietary process that facilitates the identification of companies with materially lower carbon factor risk through the analysis of factors such as carbon emissions intensity and fossil fuel exposure.

The Fund invests in a non-diversified portfolio of high quality companies, which are companies that Magellan Investment Partners believes are market leaders in their industry, earn returns on capital above the cost of capital, and have long term and sustainable competitive advantages. The Fund will generally hold between 20 to 40 companies in its portfolio that meet these criteria. Under normal market conditions, the Fund will allocate its assets among issuers located in at least three different countries and will invest at least 40% of its net assets in non-U.S. companies. Magellan Investment Partners may reduce this 40% minimum investment amount to 30% if it deems market conditions to be unfavorable. With respect to its non-U.S. investments, the Fund invests in companies located in developed countries but may also invest in emerging markets as part of its principal investment strategy. The Fund may invest in companies of any size, but generally invests in companies with a market capitalization of at least $5 billion.

Performance Narrative [Text Block]

oef_PerformanceNarrativeTextBlock

The return information provided in the following bar chart and table illustrates how the performance of the Fund can vary, which is one indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from year to year, while the table compares the average annual total returns of the Fund to those of a broad measure of market performance. Please keep in mind that the Fund’s past performance (before and after taxes) does not necessarily represent how it will perform in the future. Updated performance data is available on the Company’s website at www.mfg-funds.com or by calling toll-free to 1-888-825-2100.

Performance Availability Phone [Text]

oef_PerformanceAvailabilityPhone

1-888-825-2100

Performance Past Does Not Indicate Future [Text]

oef_PerformancePastDoesNotIndicateFuture

Please keep in mind that the Fund’s past performance (before and after taxes) does not necessarily represent how it will perform in the future.

Bar Chart Closing [Text Block]

oef_BarChartClosingTextBlock

The Fund’s return from January 1, 2025, through September 30, 2025, was 20.03%.

Best and Worst Quarterly Performance (during the periods shown above)

Best Quarter Return	Worst Quarter Return

16.02% (2^nd quarter, 2020)	(16.84)% (1^st quarter, 2020)

Bar Chart, Year to Date Return, Date

oef_BarChartYearToDateReturnDate

Sep. 30, 2025

Highest Quarterly Return, Label [Optional Text]

oef_HighestQuarterlyReturnLabel

Best Quarter Return

Highest Quarterly Return

oef_BarChartHighestQuarterlyReturn

16.02%

Lowest Quarterly Return, Date

oef_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

Performance Table Heading

oef_PerformanceTableHeading

Average Annual Total Returns (For the periods ended December 31, 2024)

Performance Table Uses Highest Federal Rate

oef_PerformanceTableUsesHighestFederalRate

After-tax returns for the Fund were calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table One Class of after Tax Shown [Text]

oef_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown only for Institutional Class shares, and the after-tax returns for Service Class shares will vary.

Performance Table Closing [Text Block]

oef_PerformanceTableClosingTextBlock

After-tax returns are shown only for Institutional Class shares, and the after-tax returns for Service Class shares will vary. After-tax returns for the Fund were calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred or other tax advantaged arrangements, such as a 401(k) plan or individual retirement account (“IRA”). In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Market Risks; Recent Market Events. The Fund’s investments are subject to market risk, which may cause the value of the Fund’s investments to decline. If the value of the Fund’s investments goes down, the share price of the Fund will go down, and you may lose money. U.S. and international markets have experienced volatility in recent months and years due to a number of economic, political and other global macro factors, including elevated inflation levels, trade tensions, tariffs and the ongoing wars in Europe and the Middle East. Uncertainties regarding the future of the Federal Reserve’s monetary policy, political events, rising government debt in the U.S. and the possibility of a national or global recession have also contributed to market volatility. During periods of volatility, the Fund may experience high levels of shareholder redemptions and may have to sell securities at times when the Fund would otherwise not do so, potentially at unfavorable prices. Certain securities may be difficult to value during such periods.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Stock Selection Risks. The stocks selected for the Fund may decline in value or not increase in value when the stock market in general is rising.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Emerging Markets Risks. Emerging market countries may have relatively unstable governments, weaker economies and less developed legal systems with fewer securities holder rights. Emerging market economies may be based on only a few industries and security issuers may be more susceptible to economic weakness and more likely to default. Emerging market securities also tend to be less liquid.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Non-Diversification Risks. The Fund is non-diversified, which means it may invest more of its assets in a smaller number of companies than funds that are diversified. Gains or losses on a single stock may have greater impact on the Fund than for other funds that invest in a greater number of companies.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

ESG and Low Carbon Investing Risks. In pursuing Magellan Investment Partners’ ESG and low carbon investment strategy, there is a risk that the Fund may invest in companies that underperform the global equity markets or other companies in a portfolio that do not employ such strategy because the Fund’s universe of investments may be smaller than that of other funds. The Fund may forgo opportunities to gain exposure to certain companies, industries, sectors or countries, and it may choose to sell a security when it might otherwise be disadvantageous to do so.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

ADR/GDR Risks. The risks of ADRs and GDRs include many of the risks associated with investing directly in foreign securities, such as currency rate fluctuations and political and economic instability.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Shareholder Concentration Risks. A large percentage of the Fund’s shares are held by a small number of shareholders, including affiliates of Magellan Investment Partners. A large redemption by one or more of these shareholders could result in the Fund selling securities when it otherwise would not have done so, accelerating the realization of capital gains and increasing transaction costs. A large redemption could also significantly reduce the Fund’s assets and increase the Fund’s expenses.

Prospectus [Line Items]

oef_ProspectusLineItems

Risk [Text Block]

oef_RiskTextBlock

Cybersecurity Risks. Despite the various protections utilized by the Fund and its service providers, systems, networks, or devices utilized by the Fund can be potentially breached. The Fund and its shareholders could be negatively impacted as a result of a cybersecurity breach.

Prospectus [Line Items]

oef_ProspectusLineItems

Management Fees (as a percentage of Assets)

oef_ManagementFeesOverAssets

0.80%

Shareholder Servicing Fee

oef_Component1OtherExpensesOverAssets

0.00%

Other Expenses (as a percentage of Assets):

oef_OtherExpensesOverAssets

1.33%

Fee Waiver or Reimbursement