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AMG GW&K High Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AMG GW&K High Income Fund (formerly AMG Managers Global Income Opportunity Fund)
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of AMG GW&K High Income Fund (the “Fund”) is to seek to provide a high level of current income.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Capital appreciation is a secondary objective.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below 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 examples below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 157% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 157.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expense information has been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example will help you compare the cost of investing in the Fund to the cost of investing in other mutual funds. The Example makes certain assumptions. It assumes that you invest $10,000
as an initial investment in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. It also assumes that your investment has a 5% total return each year and the Fund’s operating expenses remain the same. The Example includes the Fund’s contractual expense limitation through May 1, 2022. Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to invest principally in a diversified portfolio of short-term, below investment grade corporate bonds (commonly known as “junk bonds” or “high yield securities”). The Fund seeks to achieve a high level of current income while minimizing price volatility associated with credit and interest rate risk.
The Fund intends to invest primarily in below investment grade securities, although the Fund may also invest in investment grade securities. Below investment grade securities are rated below Baa3 by Moody’s Investors Service, Inc. (“Moody’s”) or below BBB- by S&P Global Ratings (“S&P”) or similarly rated by another nationally recognized statistical rating organization (“NRSRO”), or unrated but determined by GW&K Investment Management, LLC, the subadviser to the Fund (“GW&K” or the “Subadviser”), to be of comparable credit quality. In cases where the credit ratings agencies have assigned different credit ratings to the same security, the security will be considered to have the higher credit rating.
Although the Fund may invest in instruments of any duration or maturity, the Fund normally will seek to maintain a weighted average maturity of five years or less. The Fund seeks to avoid the lowest rated bonds in the high yield market by targeting bonds with a rating of B or higher by any NRSRO. The Fund’s average weighted portfolio maturity and duration may vary from time to time depending on the Subadviser’s views on the direction of interest rates.
The Fund may invest in debt securities issued by any of the following: public and private U.S. companies; the U.S. government and its agencies, such as the Federal Home Loan Bank; and state and local governments issuing taxable municipal securities. The Fund may also invest in privately placed securities, Rule 144A securities (securities that may be sold pursuant to Rule 144A under the Securities Act of 1933) and preferred securities. In selecting potential investments for the Fund, GW&K combines quantitative screening tools with in-depth security specific fundamental research. GW&K uses top-down research that focuses on duration, sector allocation, credit quality and yield curve, as well as bottom-up research that focuses on fundamental analysis, valuation analysis, technical analysis and environmental, social and governance (“ESG”) factor analysis. GW& K may adjust its assessment of an investment based on a number of considerations.
In selecting debt securities issued by public and private U.S. companies, including corporate bonds, privately placed securities, Rule 144A securities and preferred securities, and debt securities issued by state and local governments issuing taxable municipal securities, GW&K applies its ESG factor analysis as one element of the investment process. The goal of the ESG factor analysis is to seek investments with lesser exposure to, or better management of, ESG risks.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
There is the risk that you may lose money on your investment. All investments carry a certain amount of risk, and the Fund cannot guarantee that it will achieve its investment objective. An investment in the Fund is not a deposit or obligation of any bank, is not endorsed or guaranteed by any bank, and is not insured by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency.
Below are some of the risks of investing in the Fund. The risks are presented in an order intended to facilitate readability and their order does not imply that the realization of one risk is more likely to occur than another risk or likely to have a greater adverse impact than another risk. The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund’s portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund.
High Yield Risk
—below investment grade debt securities and unrated securities of similar credit quality (commonly known as “junk bonds” or “high yield securities”) may be subject to greater levels of interest rate, credit, liquidity, and market risk than higher-rated securities. These securities are considered predominately speculative with respect to the issuer’s continuing ability to make principal and interest payments.
Debt Securities Risk
—the value of a debt security changes in response to various factors, including, for example, market-related factors, such as changes in interest rates or changes in the actual or perceived ability of an issuer to meet its obligations. Investments in debt securities are subject to, among other risks, credit risk, interest rate risk, extension risk, prepayment risk and liquidity risk.
Market Risk
—market prices of investments held by the Fund may fall rapidly or unpredictably due to a variety of factors, including economic, political, or market conditions or other factors including terrorism, war, natural disasters and the spread of infectious illness or other public health issues, including epidemics or pandemics such as the COVID-19 outbreak in 2020, or in response to events that affect particular industries or companies.
Interest Rate Risk
—fixed coupon payments (cash flows) of bonds and debt securities may become less competitive with the market in periods of rising interest rates and cause bond prices to decline. During periods of increasing interest rates, the Fund may experience high levels of volatility and shareholder redemptions, and may have to sell securities at times when it would otherwise not do so, and at unfavorable prices, which could reduce the returns of the Fund.
Credit Risk
—the issuer of bonds or other debt securities may be unable or unwilling, or may be perceived as unable or unwilling, to make timely interest or principal payments or otherwise honor its obligations.
Changing Distribution Level Risk
—the Fund will normally receive income which may include interest, dividends and/or capital gains, depending upon its investments. The distribution amount paid by the Fund will vary and generally depends on the amount of income the Fund earns (less expenses) on its portfolio holdings, and capital gains or losses it recognizes. A decline in the Fund’s income or net capital gains arising from its investments may reduce its distribution level.
ESG Investing Risk
—the subadviser incorporates ESG criteria into its investment process, which may result in the selection or exclusion of securities of certain issuers for reasons other than financial performance, and carries the risk that the Fund’s investment returns may underperform funds that do not utilize an ESG investment strategy. The application of this strategy may affect the Fund’s investment exposure to certain companies, sectors, regions, countries or types of investments, which could negatively impact the Fund’s performance depending on whether such investments are in or out of favor. Applying ESG criteria to investment decisions is qualitative and subjective by nature, and there is no guarantee that the criteria utilized by the Subadviser or any judgment exercised by the Subadviser will reflect the beliefs or values of any particular investor. Socially responsible norms differ by region and industry, and a company’s ESG practices or the Subadviser’s assessment of a company’s ESG practices may change over time.
Extension Risk
—during periods of rising interest rates, a debtor may pay back a bond or other fixed income security slower than expected or required, and the value of such security may fall.
Inflation/Deflation Risk
—Inflation risk is the risk that the value of assets or income from investments will be worth less in the future. Deflation risk is the risk that the prices throughout the economy decline over time—the opposite of inflation. Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio.
Liquidity Risk
—the Fund may not be able to dispose of particular investments, such as illiquid securities, readily at favorable times or prices or the Fund may have to sell them at a loss.
Management Risk
—because the Fund is an actively managed investment portfolio, security selection or focus on securities in a particular style, market sector or group of companies may cause the Fund to incur losses or underperform relative to its benchmarks or other funds with a similar investment objective. There can be no guarantee that the Subadviser’s investment techniques and risk analysis will produce the desired result.
Prepayment Risk
—a debtor may exercise its right to pay back a bond or other debt security earlier than expected or required during periods of decreasing interest rates.
Reinvestment Risk
—the Fund may have difficulty reinvesting payments from debtors and may receive lower rates than from its original investments.
Rule 144A Securities Risk
—investing in Rule 144A securities may reduce the liquidity of the Fund’s investments in the event that an adequate trading market does not exist for these securities. An insufficient number of qualified institutional buyers interested in purchasing Rule 144A securities at a particular time could adversely affect the marketability of the securities, and the Fund may be unable to sell the security at the desired time or price, if at all. The purchase price and subsequent valuation of Rule 144A securities normally reflect a discount, which may be significant, from the market price of comparable unrestricted securities for which a liquid trading market exists.
U.S. Government Securities Risk
—obligations issued by some U.S. Government agencies, authorities, instrumentalities, or sponsored enterprises such as Government National Mortgage Association (“GNMA”) are backed by the full faith and credit of the U.S. Government, while obligations issued by others, such as Federal National Mortgage Association (“FNMA”), Federal Home Loan Mortgage Corporation (“FHLMC”), and Federal Home Loan Banks (“FHLBs”), are not backed by the full faith and credit of the U.S. Government and are backed solely by the entity’s own resources or by the ability of the entity to borrow from the U.S. Treasury. If one of these agencies defaults on a loan, there is no guarantee that the U.S. Government will provide financial support.
Risk Lose Money [Text] rr_RiskLoseMoney There is the risk that you may lose money on your investment.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit or obligation of any bank, is not endorsed or guaranteed by any bank, and is not insured by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information illustrates the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s performance compares to that of a broad-based securities market index. As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future. Effective February 27, 2017, outstanding Class S shares of the Fund (formerly shares of the Fund’s sole share class, which were reclassified and redesignated as Class S shares on October 1, 2016) were renamed Class N shares. To obtain updated performance information please visit www.amgfunds.com or call 800.548.4539.
As of December 4, 2020, GW&K was appointed as subadviser to the Fund and the Fund changed its name to “AMG GW&K High Income Fund,” adopted its current investment strategies and
began comparing its performance to the Bloomberg Barclays U.S. High Yield 1-5 Year Ba Index. The Fund’s performance information for periods prior to December 4, 2020 reflects the Fund’s investment strategy that was in effect at that time and may have been different had the Fund’s current investment strategy been in effect.
Because the Fund’s Class I shares have not operated for a full calendar year, performance history for this share class is not available.​​​​​​​ Class I shares would have similar annual returns as Class N shares because both of the classes are invested in the same portfolio of securities. However, Class I shares are subject to different expenses than Class N shares, and Class I performance would vary to that extent.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information illustrates the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s performance compares to that of a broad-based securities market index.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Fund’s Class I shares have not operated for a full calendar year, performance history for this share class is not available.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.548.4539
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.amgfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns as of 12/31/20 (Class N)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 7.07% (2nd Quarter 2020)
Worst Quarter: -6.80% (4th Quarter 2016)
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.07%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12/31/20
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class N shares only, and after-tax returns for Class I shares will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
After-tax returns are 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. After-tax returns are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
After-tax returns are shown for Class N shares only, and after-tax returns for Class I shares will vary.
AMG GW&K High Income Fund | Class N  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.39% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.39% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.78%
Fee Waiver and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.94%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements rr_NetExpensesOverAssets 0.84% [2]
1 Year rr_ExpenseExampleYear01 $ 86
3 Years rr_ExpenseExampleYear03 455
5 Years rr_ExpenseExampleYear05 864
10 Years rr_ExpenseExampleYear10 $ 2,006
2011 rr_AnnualReturn2011 3.39%
2012 rr_AnnualReturn2012 10.63%
2013 rr_AnnualReturn2013 (1.40%)
2014 rr_AnnualReturn2014 1.84%
2015 rr_AnnualReturn2015 (6.22%)
2016 rr_AnnualReturn2016 4.79%
2017 rr_AnnualReturn2017 10.55%
2018 rr_AnnualReturn2018 (4.18%)
2019 rr_AnnualReturn2019 7.67%
2020 rr_AnnualReturn2020 12.16%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.80%)
1 Year rr_AverageAnnualReturnYear01 12.16%
5 Years rr_AverageAnnualReturnYear05 6.04%
10 Years rr_AverageAnnualReturnYear10 3.74%
AMG GW&K High Income Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.39% [1],[3]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [3]
Other Expenses rr_OtherExpensesOverAssets 1.19% [1],[3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.58% [3]
Fee Waiver and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.94%) [2],[3]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements rr_NetExpensesOverAssets 0.64% [2],[3]
1 Year rr_ExpenseExampleYear01 $ 65
3 Years rr_ExpenseExampleYear03 390
5 Years rr_ExpenseExampleYear05 756
10 Years rr_ExpenseExampleYear10 $ 1,784
AMG GW&K High Income Fund | Return After Taxes on Distributions | Class N  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.40%
5 Years rr_AverageAnnualReturnYear05 5.42%
10 Years rr_AverageAnnualReturnYear10 2.90%
AMG GW&K High Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class N  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.03%
5 Years rr_AverageAnnualReturnYear05 4.55%
10 Years rr_AverageAnnualReturnYear10 2.60%
AMG GW&K High Income Fund | Bloomberg Barclays U.S. High Yield 1-5 Year Ba Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.79% [4]
5 Years rr_AverageAnnualReturnYear05 6.31% [4]
10 Years rr_AverageAnnualReturnYear10 5.81% [4]
AMG GW&K High Income Fund | Bloomberg Barclays Global Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.20% [4]
5 Years rr_AverageAnnualReturnYear05 4.79% [4]
10 Years rr_AverageAnnualReturnYear10 2.83% [4]
[1] Expense information has been restated to reflect current fees.
[2] AMG Funds LLC (the “Investment Manager”) has contractually agreed, through at least May 1, 2022, to waive management fees and/or pay or reimburse the Fund’s expenses in order to limit Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of taxes, interest (including interest incurred in connection with bank and custody overdrafts and in connection with securities sold short), shareholder servicing fees, distribution and service (12b-1) fees, brokerage commissions and other transaction costs, dividends payable with respect to securities sold short, acquired fund fees and expenses, and extraordinary expenses) of the Fund to the annual rate of 0.59% of the Fund’s average daily net assets (this annual rate or such other annual rate that may be in effect from time to time, the “Expense Cap”), subject to later reimbursement by the Fund in certain circumstances. In general, for a period of up to 36 months after the date any amounts are paid, waived or reimbursed by the Investment Manager, the Investment Manager may recover such amounts from the Fund, provided that such repayment would not cause the Fund’s Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of the items noted in the parenthetical above) to exceed either (i) the Expense Cap in effect at the time such amounts were paid, waived or reimbursed, or (ii) the Expense Cap in effect at the time of such repayment by the Fund. The contractual expense limitation may only be terminated in the event the Investment Manager or a successor ceases to be the investment manager of the Fund or a successor fund, by mutual agreement between the Investment Manager and the AMG Funds III Board of Trustees or in the event of the Fund’s liquidation unless the Fund is reorganized or is a party to a merger in which the surviving entity is successor to the accounting and performance information of the Fund.
[3] Because Class I shares commenced operations on or following the date of this Prospectus, these amounts are based on estimates for the current fiscal year.
[4] The Bloomberg Barclays U.S. High Yield 1-5 Year Ba Index replaced the Bloomberg Barclays Global Aggregate Bond Index as the Fund's benchmark on December 4, 2020 because the Investment Manager and Subadviser believe the new benchmark is more representative of the Fund's current investment strategies.