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Loomis Sayles Global Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Loomis Sayles Global Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment goal is long-term growth of capital.
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 $50,000 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
32 of the Prospectus
, in Appendix A to the
Prospectus and on page 
104 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 March 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. During its most recently ended fiscal year, the Fund’s portfolio turnover
rate was
44
% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
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 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 $50,000 in the Natixis Funds Complex.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses for Class T shares 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 dates 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 primarily in equity securities, including common stocks and depositary receipts. The Fund will invest in securities that provide exposure to no fewer than three countries, which will include the U.S. In addition, the Fund will invest at least 40% of its assets in securities of companies that maintain their principal place of business or conduct their principal business activities outside the U.S., companies that have their securities traded on non-U.S. exchanges or companies that have been formed under the laws of non-U.S. countries. Notwithstanding the foregoing, the Adviser does not consider a security to be foreign if it is included in the U.S. equity indices published by S&P Global Ratings or Russell Investments or if the security’s country of risk defined by Bloomberg is the United States. The Fund may also invest up to 30% of its assets in emerging markets securities. The Fund considers a security to be an emerging markets security if its country of risk as defined by Bloomberg is included within the MSCI Emerging & Frontier Markets Index. The Fund focuses on stocks of large capitalization companies, but the Fund may invest in companies of any size.
The Fund normally invests across a wide range of sectors and industries. The Fund’s portfolio manager employs a growth style of equity management, which means that the Fund seeks to invest in companies with sustainable competitive advantages versus others, long-term structural growth drivers that will lead to above-average future cash flow growth, attractive cash flow returns on invested capital, and management teams focused on creating long-term value for shareholders. The Fund’s portfolio manager also aims to invest in companies when they trade at a significant discount to the estimate of intrinsic value (i.e., companies with share prices trading significantly below what the portfolio manager believes the share price should be).
The Fund will consider selling a portfolio investment when the portfolio manager believes an unfavorable structural change occurs within a given business or the markets in which it operates, when a critical underlying investment assumption is flawed, when a more attractive reward-to-risk opportunity becomes available, when the current price fully reflects intrinsic value, or for other investment reasons which the portfolio manager deems appropriate.
The Fund may also engage in foreign currency transactions (including foreign currency forwards and foreign currency futures) for hedging purposes, invest in options for hedging and investment purposes and invest in securities issued pursuant to Rule 144A under the Securities Act of 1933 (“Rule 144A securities”). Under normal market conditions, the Adviser does not intend to hedge currency risk, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged. Except as provided above, the Fund is not limited in the percentage of its assets that it may invest in these instruments.

 
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.
Equity Securities Risk:
The value of the Fund’s investments in equity securities could be subject to unpredictable declines in the value of individual
securities and periods of below-average performance in individual securities or in the equity market as a whole. Growth stocks are generally more sensitive
to market movements than other types of stocks primarily because their stock prices are based heavily on future expectations. If the Adviser’s assessment of
the prospects for a company’s growth is wrong, or if the Adviser’s judgment of how other investors will value the company’s growth is wrong, then the price
of the company’s stock may fall or not approach the value that the Adviser has placed on it. In the event an issuer is liquidated or declares bankruptcy, the
claims of owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock. 
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. 
Management Risk:
A strategy used by the Fund’s portfolio manager 
may fail to produce the intended result.
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. Derivatives, and particularly over-the-counter (“OTC’”) derivatives, are generally
subject to liquidity risk as well. Liquidity issues may also make it difficult to value the Fund’s investments.
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.
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 derivatives, 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.
Currency Risk:
Fluctuations in the exchange rates between different currencies may negatively affect an investment.
The Fund may be subject to currency
risk because it may invest in foreign currency forwards and foreign currency futures and may invest in securities or other instruments denominated in, or that
generate income denominated in, foreign currencies. Under normal market conditions, the Fund does not intend to hedge currency risk, which may cause the
Fund to incur losses that would not have been incurred had the risk been hedged.
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 foreign currency forwards, foreign currency futures and
options) 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 markets 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 involves other risks, such as
the credit 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 derivatives positions. There is also the risk that the
Fund may be unable to terminate or sell a derivative 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.
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 the 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.
Small- and Mid-Capitalization Companies Risk:
Compared to large-capitalization companies, small- and mid-capitalization companies are more likely to
have limited product lines, markets or financial resources. Stocks of these companies often trade less frequently and in limited volume and their prices may
fluctuate more than stocks of large-capitalization companies. As a result, it may be relatively more difficult for the Fund to buy and sell securities of small-
and mid-capitalization companies.
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 Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table shown below provide some indication of 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 average annual returns for the one-year,
life-of-class
and life-of-fund periods (as applicable) compare to 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.
The chart does not reflect any sales charge that you may be required to pay when you buy or redeem the Fund’s shares. A sales charge will reduce your
return.
Effective May 1, 2021, Class C shares will automatically convert to Class A shares after eight years. Class C total returns in the table below do not reflect the
automatic conversion of Class C shares to Class A shares after eight years.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table shown below provide some indication of 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 average annual returns for the one-year, life-of-class and life-of-fund periods (as applicable) compare to those of a broad measure of market performance.
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 [Heading] rr_BarChartHeading Total Returns for Class Y Shares
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The chart does not reflect any sales charge that you may be required to pay when you buy or redeem the Fund’s shares. A sales charge will reduce your return.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest Quarterly Return:

Second Quarter 2020,
26.23%


Lowest Quarterly Return:

First Quarter 2020,
-14.45%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2020)
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 Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after-tax returns are shown for only one class of the Fund. After-tax returns for the other classes of the Fund will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
The Fund did not have Class T shares outstanding during the periods shown above. The returns of Class T shares would have been substantially similar to the
returns of the Fund’s other share classes because they would have been invested in the same portfolio of securities and would only differ to the extent the
other share classes did not have the same expenses. Performance of Class T shares shown above is that of Class A shares, which have the same expenses as
Class T shares, restated to reflect the different sales load applicable to Class T shares.
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 shown are not relevant to investors who
hold their shares through tax-advantaged arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual
retirement accounts.
 
The after-tax returns are shown for only one class of the Fund. After-tax returns for the other classes of the Fund will vary.
Index
performance reflects no deduction for fees, expenses or taxes.
Loomis Sayles Global Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.75% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.39%
Total annual fund operating expenses rr_ExpensesOverAssets 1.39%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.19% [3],[4],[5]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.20%
1 year rr_ExpenseExampleYear01 $ 690
3 years rr_ExpenseExampleYear03 972
5 years rr_ExpenseExampleYear05 1,275
10 years rr_ExpenseExampleYear10 $ 2,132
Past 1 Year rr_AverageAnnualReturnYear01 27.27%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 17.47%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Loomis Sayles Global Growth 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_MaximumDeferredSalesChargeOverOther 1.00%
Redemption fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.75% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.39%
Total annual fund operating expenses rr_ExpensesOverAssets 2.14%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.19% [3],[4],[5]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.95%
1 year rr_ExpenseExampleYear01 $ 298
3 years rr_ExpenseExampleYear03 652
5 years rr_ExpenseExampleYear05 1,132
10 years rr_ExpenseExampleYear10 2,457
1 year rr_ExpenseExampleNoRedemptionYear01 198
3 years rr_ExpenseExampleNoRedemptionYear03 652
5 years rr_ExpenseExampleNoRedemptionYear05 1,132
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,457
Past 1 Year rr_AverageAnnualReturnYear01 33.04%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 18.04%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Loomis Sayles Global Growth 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_MaximumDeferredSalesChargeOverOther none
Redemption fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.75% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.33%
Total annual fund operating expenses rr_ExpensesOverAssets 1.08%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.18% [4],[5]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.90%
1 year rr_ExpenseExampleYear01 $ 92
3 years rr_ExpenseExampleYear03 326
5 years rr_ExpenseExampleYear05 578
10 years rr_ExpenseExampleYear10 $ 1,301
Past 1 Year rr_AverageAnnualReturnYear01 35.47%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 20.35%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2017
Loomis Sayles Global Growth Fund | Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOther none
Redemption fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.75% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.39% [6]
Total annual fund operating expenses rr_ExpensesOverAssets 1.39%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.19% [3],[4],[5]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.20%
1 year rr_ExpenseExampleYear01 $ 369
3 years rr_ExpenseExampleYear03 661
5 years rr_ExpenseExampleYear05 974
10 years rr_ExpenseExampleYear10 $ 1,861
Past 1 Year rr_AverageAnnualReturnYear01 31.65%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 18.30%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Loomis Sayles Global Growth 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_MaximumDeferredSalesChargeOverOther none
Redemption fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.75% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.39%
Total annual fund operating expenses rr_ExpensesOverAssets 1.14%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.19% [3],[4],[5]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.95%
1 year rr_ExpenseExampleYear01 $ 97
3 years rr_ExpenseExampleYear03 343
5 years rr_ExpenseExampleYear05 609
10 years rr_ExpenseExampleYear10 $ 1,369
2017 rr_AnnualReturn2017 32.00%
2018 rr_AnnualReturn2018 (6.71%)
2019 rr_AnnualReturn2019 30.58%
2020 rr_AnnualReturn2020 35.33%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.23%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.45%)
Past 1 Year rr_AverageAnnualReturnYear01 35.33%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 19.25%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Loomis Sayles Global Growth Fund | Return After Taxes on Distributions | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 33.46%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 17.89%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Loomis Sayles Global Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 22.24%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 15.29%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Loomis Sayles Global Growth Fund | MSCI All Country World Index (Net)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 16.25%
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 12.83%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2016
Loomis Sayles Global Growth Fund | MSCI All Country World Index (Net) (3/31/17)  
Risk/Return: rr_RiskReturnAbstract  
Life of Class N / Life of Fund rr_AverageAnnualReturnSinceInception 12.27%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2017
[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] The Fund’s operating expenses have been restated to reflect a reduction in management fees, effective as of December 15, 2020, as if such reduction had been in effect during the fiscal year ended November 30, 2020. The information has been restated to better reflect anticipated expenses of the Fund.
[3] In order to ensure that the total annual fund operating expenses after fee waiver and/or expense reimbursement do not exceed the amounts disclosed in the table, the Adviser may voluntarily waive additional advisory fees. This may result in the Class A, C, T and Y shareholders realizing a total annual fund operating expense after fee waiver and/or expense reimbursement lower than 1.20%, 1.95%, 1.20%, and 0.95% of the Fund’s average daily net assets for Class A, C, T and Y shares, respectively. This additional waiver may be terminated at any time.
[4] 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 1.20%, 1.95%, 0.90%, 1.20% and 0.95% of the Fund’s average daily net assets for Class A, C, N, T 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 March 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, T 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.
[5] 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 March 31, 2022 and may be terminated before then only with the consent of the Fund’s Board of Trustees.
[6] Other expenses for Class T shares are estimated for the current fiscal year.