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Loomis Sayles Credit Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Loomis Sayles Credit Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks high current income
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock with a secondary objective of capital growth.
Expense [Heading] rr_ExpenseHeading Fund Fees & Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The following 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 this table. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the Natixis Funds Complex.
More information about these and other discounts is
available from your financial professional and in the section “How Sales Charges Are Calculated” on page
62 of the Prospectus
, in Appendix A to the
Prospectus and on page 
120
in the section “Reduced Sales Charges” of the Statement of Additional Information (“SAI”).
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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 January 31, 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 for you if your 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. For the period from the Fund’s commencement of operations on
September 29, 2020 through September 30, 2020, the Fund’s portfolio turnover rate was 0% of the average value of its portfolio. 
Portfolio Turnover, Rate rr_PortfolioTurnoverRate none
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock
A 1.00% contingent deferred sales charge (“CDSC”) may apply to certain purchases of Class A shares of $1,000,000 or more that are redeemed within eighteen months of the
date of purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the Natixis Funds Complex.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses are estimated for the current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in 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 (except where indicated). The
example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, except that the example is
based on the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement assuming that such waiver and/or reimbursement will
only be in place through the date noted above and on the Total Annual Fund Operating Expenses for the remaining periods. The example does not take into
account brokerage commissions and other fees to financial intermediaries that you may pay on your purchases and sales of shares of the Fund. Although
your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If shares are redeemed:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If shares are not redeemed:
Strategy [Heading] rr_StrategyHeading Investments, Risks and Performance Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Fund will invest at least 80% of its net assets (plus any borrowings made for investment purposes) in fixed-income
securities (for example, bonds and other investments that Loomis Sayles believes have similar economic characteristics, such as notes, debentures and
loans).
The Fund will primarily invest in investment-grade-fixed-income securities. The Fund may also invest up to 35% of its assets in below investment-grade fixed-
income securities (commonly known as “junk bonds”). Below investment-grade fixed-income securities are rated below investment-grade quality (i.e., none of
the three major rating agencies (Moody’s Investors Service, Inc., Fitch Investor Services, Inc. or S&P Global Ratings) have rated the securities in one of their
respective top four ratings categories). The Fund’s fixed-income securities investments may include unrated securities (securities that are not rated by a rating
agency) if Loomis Sayles determines that the securities are of comparable quality to rated securities that the Fund may purchase. There is no minimum rating
for the securities in which the Fund may invest. The Fund may invest in fixed-income securities of any maturity. The Fund may invest in securities of any
duration.
The Fund will primarily invest in fixed-income securities of domestic and foreign corporate issuers. The Fund may invest up to 30% of its assets in foreign
securities, including emerging markets securities. Although certain securities purchased by the Fund may be issued by domestic companies incorporated
outside of the United States, Loomis Sayles does not consider these securities to be foreign if the issuer is included in the U.S. fixed-income indices published
by Bloomberg Barclays. The Fund will only invest in U.S. dollar denominated securities.
In deciding which securities to buy and sell, Loomis Sayles may consider a number of factors related to the bond issue and the current bond market, including,
for example, the financial strength of the issuer, current interest rates, current valuations and Loomis Sayles’ expectations regarding general trends in interest
rates. Loomis Sayles will also consider how purchasing or selling a bond would impact the overall portfolio’s risk profile (for example, its sensitivity to interest
rate risk and sector-specific risk) and potential return (income and capital gains).
Three themes typically drive the Fund’s investment approach. First, Loomis Sayles generally seeks fixed-income securities that are attractively valued relative
to the Loomis Sayles’ credit research team’s assessment of credit risk. This includes seeking to capture credit improvement situations based on forward-
looking proprietary research. The broad coverage combined with the objective of identifying attractive investment opportunities makes this an important
component of the investment approach. Second, the Fund may invest significantly in securities the prices of which Loomis Sayles believes are more sensitive
to events related to the underlying issuer than to changes in general interest rates or overall market default rates. These securities may not have a direct
correlation with changes in interest rates, thus helping to manage interest rate risk and to offer diversified sources for return. Third, Loomis Sayles analyzes
different sectors of the economy and differences in the yields (“spreads”) of various fixed-income securities (U.S. government securities, investment-grade
securities, securitized assets, high-yield securities, emerging market securities, non-U.S. sovereigns and credits, convertible securities, bank loans and
municipal securities) in an effort to find securities that it believes may produce attractive returns for the Fund in comparison to their risk.
The Fund may also invest in U.S. government securities, bank loans, collateralized loan obligations, convertible securities and securities issued pursuant to
Rule 144A under the Securities Act of 1933 (“Rule 144A securities”). The Fund may also invest in futures, forward contracts and swaps (including credit
default swaps) for hedging and investment purposes.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money
by investing in the Fund. 
 
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.
Credit/Counterparty Risk:
Credit/counterparty risk is the risk that the issuer or guarantor of a fixed-income security, or the counterparty to a derivative or
other transaction, will be unable or unwilling to make timely payments of interest or principal or to otherwise honor its obligations. As a result, the Fund may
sustain losses or be unable or delayed in its ability to realize gains. The Fund will be subject to credit/counterparty risks with respect to the counterparties to
its derivatives transactions. This risk will be heightened to the extent the Fund enters into derivative transactions with a single counterparty (or affiliated
counterparties that are part of the same organization), causing the Fund to have significant exposure to such counterparty. Many of the protections afforded
to participants on organized exchanges and clearing houses, such as the performance guarantee given by a central clearing house, are not available in
connection with over-the-counter (“OTC”) derivatives transactions, such as foreign currency transactions. For centrally cleared
d
erivat
iv
es, such as cleared
swaps, futures and many options, the primary credit/counterparty risk is the creditworthiness of the Fund’s clearing broker and the central clearing house
itself. 
Interest Rate Risk:
Interest rate risk is the risk that the value of the Fund’s investments will fall if interest rates rise.
 Generally, the value of fixed-income
securities rises when prevailing interest rates fall and falls when interest rates rise.  Interest rate risk generally is greater for funds that invest in fixed-income
securities with relatively longer durations than for funds that invest in fixed-income securities with shorter durations. 
 In addition, an economic downturn or
period of rising interest rates could adversely affect the market for these securities and reduce the Fund’s ability to sell them, negatively impacting the
performance of the Fund. Potential future changes in government monetary policy may affect the level of interest rates. 
Below Investment Grade Fixed-Income Securities Risk:
The Fund’s investments in below investment grade fixed-income securities, also known as
“junk bonds,” may be subject to greater risks than other fixed-income securities, including being subject to greater levels of interest rate risk,
credit/counterparty risk (including a greater risk of default) and liquidity risk. The ability of the issuer to make principal and interest payments is predominantly
speculative for below investment grade fixed-income securities.
Market/Issuer Risk:
The market value of the Fund’s investments will move up and down, sometimes rapidly and unpredictably, based upon overall market
and economic conditions, as well as a number of reasons that directly relate to the issuers of the Fund’s investments, such as management performance,
financial condition and demand for the issuers’ goods and services. 
Large Investor Risk:
Ownership of shares of the Fund may be concentrated in one or a few large investors. Such investors may redeem shares in large
quantities or on a frequent basis. Redemptions by a large investor can affect the performance of the Fund, may increase realized capital gains, including
short-term capital gains taxable as ordinary income, may accelerate the realization of taxable income to shareholders and may increase transaction costs.
These transactions potentially limit the use of any capital loss carryforwards and certain other losses to offset future realized capital gains (if any). Such
transactions may also increase the Fund’s expenses.
Leverage Risk:
Leverage is the risk associated with securities or investment practices (e.g., borrowing and use of certain derivatives) that multiply small
index, market or asset-price movements into larger changes in value. The use of leverage increases the impact of gains and losses on the Fund’s returns, and
may lead to significant losses if investments are not successful.
Liquidity Risk:
  Liquidity risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it
expects. Decreases in the number of financial institutions willing to make markets in the Fund’s investments or in their capacity or willingness to transact may
increase the Fund’s exposure to this risk. Events that may lead to increased redemptions, such as market disruptions or increases in interest rates, may also
negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time
and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Securities acquired in a private
placement, such as Rule 144A securities, are generally subject to significant liquidity risk because they are subject to strict restrictions on resale and there
may be no liquid secondary market or ready purchaser for such securities.
 Liquidity issues may also make it difficult to value the Fund’s investments.
Collateralized Loan Obligation (“CLO”) Risk:
Investments in CLOs involve risks in addition to the risks associated with investments in debt obligations
and other fixed-income securities such as credit risk, interest rate risk, liquidity risk and market/issuer risk. The degree of such risk will generally correspond
to the type of underlying assets and the specific tranche in which the Fund is invested. A CLO’s performance is linked to the expertise of the CLO manager and
its ability to manage the CLO’s portfolio. Changes in the regulation of CLOs may adversely affect the value of the CLO investments held by the Fund. The
tranche of the CLO held by the Fund may be subordinate to other classes of the CLO’s debt. CLO debt is payable solely from the proceeds of the CLO’s
underlying assets and, therefore, if the income from the underlying loans is insufficient to make payments on one or more tranches of the CLO’s debt, no other
assets will be available for payment. CLO debt securities may be subject to redemption and the timing of redemptions may adversely affect the returns on
CLO debt. The CLO manager may not find suitable assets in which to invest and the CLO manager’s opportunities to invest may be limited.
Convertible Securities Risk:
 Convertible securities have investment characteristics of both equity and debt securities. Investments in convertible securities
are subject to the usual risks associated with debt instruments, such as interest rate risk and credit risk. Convertible securities also react to changes in the
value of the common stock into which they convert, and are thus subject to many of the same risks as investing in common stock. The Fund may also be
forced to convert a convertible security at an inopportune time, which may decrease the Fund’s return.
Cybersecurity and Technology Risk:
The Fund, its service providers, and other market participants increasingly depend on complex information
technology and communications systems, which are subject to a number of different threats and risks that could adversely affect the Fund and its
shareholders. Cybersecurity and other operational and technology issues may result in financial losses to the Fund and its shareholders.
Derivatives Risk:
Derivative instruments (such as those in which the Fund may invest, including swap transactions (including credit default swaps)) are
subject to changes in the value of the underlying assets or indices on which such instruments are based. There is no guarantee that the use of derivatives will
be effective or that suitable transactions will be available. Even a small investment in derivatives may give rise to leverage risk and can have a significant
impact on the Fund’s exposure to securities market values, interest rates or currency exchange rates. It is possible that the Fund’s liquid assets may be
insufficient to support its obligations under its derivatives positions. The use of derivatives for other than hedging purposes may be considered a speculative
activity, and involves greater risks than are involved in hedging. The use of derivatives may cause the Fund to incur losses greater than those that would have
occurred had derivatives not been used. The Fund’s use of derivatives, such as
forward currency contracts and swap transactions (including credit default
swaps)) involves other risks, such as the credit/counterparty risk relating to the other party to a derivative contract (which is greater for forward currency
contracts, uncleared swaps and other OTC derivatives), the risk of difficulties in pricing and valuation, the risk that changes in the value of a derivative may
not correlate as expected with changes in the value of relevant assets, rates or indices, liquidity risk, allocation risk and the risk of losing more than the initial
margin (if any) required to initiate derivative positions. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an
advantageous time or price. The Fund’s derivative counterparties may experience financial difficulties or otherwise be unwilling or unable to honor their
obligations, possibly resulting in losses to the Fund. 
Emerging Markets Risk:
In addition to the risks of investing in foreign investments generally, emerging markets investments are subject to greater risks
arising from political or economic instability, nationalization or confiscatory taxation, currency exchange restrictions, sanctions by other countries (such as the
United States) and an issuer’s unwillingness or inability to make principal or interest payments on its obligations. Emerging markets companies may be
smaller and have shorter operating histories than companies in developed markets.
Foreign Securities Risk:
Investments in foreign securities may be subject to greater political, economic, environmental, credit/counterparty
and information
risks. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity.
LIBOR Risk:
LIBOR risk is the risk that the transition away from the London Interbank Offered Rate (“LIBOR”) may lead to increased volatility and illiquidity in
markets that are tied to LIBOR. LIBOR is a benchmark interest rate that is used extensively as a “reference rate” for financial instruments, including many
corporate and municipal bonds, bank loans, asset-backed and mortgage-related securities, interest rate swaps and other derivatives. Additionally, the Fund
may borrow money at rates that are based on LIBOR. In July 2017, the head of the United Kingdom Financial Conduct Authority, the agency that oversees
LIBOR, announced that after 2021 it will cease its active encouragement of banks to provide the quotations needed to sustain LIBOR. That announcement
suggests that LIBOR may cease to be published after that time. The transition away from LIBOR poses a number of other risks, including changed values of
LIBOR-related investments and reduced effectiveness of hedging strategies, each of which may adversely affect the Fund’s performance.
Management Risk:
A strategy used by the Fund’s 
portfolio managers may fail to produce the intended result.
 
Prepayment and Extension Risk:
Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment
risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as
expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to
invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund.
U.S. Government Securities Risk:
Investments in certain U.S. government securities may not be supported by the full faith and credit of the U.S.
government. Accordingly, no assurance can be given that the U.S. government will provide financial support to U.S. government agencies, instrumentalities or
sponsored enterprises if it is not obligated to do so by law. The maximum potential liability of the issuers of some U.S. government securities held by the Fund
may greatly exceed their current resources, and it is possible that these issuers will not have the funds to meet their payment obligations in the future. In
such a case, the Fund would have to look principally to the agency, instrumentality or sponsored enterprise issuing or guaranteeing the security for ultimate
repayment, and the Fund may not be able to assert a claim against the U.S. government itself in the event the agency, instrumentality or sponsored enterprise
does not meet its commitment. Concerns about the capacity of the U.S. government to meet its obligations may raise the interest rates payable on its
securities, negatively impacting the price of such securities already held by the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money by investing in the Fund. 
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Risk/Return Bar Chart and Table
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information provided by the Fund in the future will give some indication of the risks of an investment in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns compare against those of a broad measure of market performance.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Fund has not yet completed a full calendar year, information related to Fund performance, including a bar chart showing annual returns, has not been included in this Prospectus.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-225-5478
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress im.natixis.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
Because the Fund has not yet completed a full calendar year, information related to Fund performance, including a bar chart showing annual returns, has not been included in this Prospectus.
The performance information provided by the Fund in the future will give some indication of the risks of an investment in the
Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns compare against those of a broad measure of market performance.
The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the
future.
Updated performance information is available online at im.natixis.com and/or by calling the Fund toll-free at 800-225-5478.
Loomis Sayles Credit Income Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.25%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.42%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.69% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.36%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.54%) [3],[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.82%
1 year rr_ExpenseExampleYear01 $ 505
3 years rr_ExpenseExampleYear03 786
5 years rr_ExpenseExampleYear05 1,089
10 years rr_ExpenseExampleYear10 $ 1,946
Loomis Sayles Credit Income Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.42%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.69% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 2.11%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.54%) [3],[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.57%
1 year rr_ExpenseExampleYear01 $ 260
3 years rr_ExpenseExampleYear03 609
5 years rr_ExpenseExampleYear05 1,084
10 years rr_ExpenseExampleYear10 2,399
1 year rr_ExpenseExampleNoRedemptionYear01 160
3 years rr_ExpenseExampleNoRedemptionYear03 609
5 years rr_ExpenseExampleNoRedemptionYear05 1,084
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,399
Loomis Sayles Credit Income Fund | Class N  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.42%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 1.00% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.42%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.90%) [3],[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.52%
1 year rr_ExpenseExampleYear01 $ 53
3 years rr_ExpenseExampleYear03 361
5 years rr_ExpenseExampleYear05 690
10 years rr_ExpenseExampleYear10 $ 1,624
Loomis Sayles Credit Income Fund | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.42%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.69% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.11%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.54%) [3],[4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.57%
1 year rr_ExpenseExampleYear01 $ 58
3 years rr_ExpenseExampleYear03 299
5 years rr_ExpenseExampleYear05 559
10 years rr_ExpenseExampleYear10 $ 1,303
[1] A 1.00% contingent deferred sales charge (“CDSC”) may apply to certain purchases of Class A shares of $1,000,000 or more that are redeemed within eighteen months of the date of purchase.
[2] Other expenses are estimated for the current fiscal year.
[3] Loomis, Sayles & Company, L.P. (“Loomis Sayles” or the “Adviser”) has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 0.82%, 1.57%, 0.52% and 0.57% of the Fund’s average daily net assets for Class A, C, N and Y shares, respectively, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through January 31, 2022 and may be terminated before then only with the consent of the Fund’s Board of Trustees. The Adviser will be permitted to recover, on a class by class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below the applicable expense limitations for Class A, C, N and Y shares. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fees or expenses were waived/reimbursed.
[4] Natixis Advisors, L.P. (“Natixis Advisors”) has given a binding contractual undertaking to the Fund to reimburse any and all transfer agency expenses for Class N shares. This undertaking is in effect through January 31, 2022 and may be terminated before then only with the consent of the Fund’s Board of Trustees.