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Natixis Oakmark Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Natixis Oakmark Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks long-term capital appreciation.
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
75 of the Prospectus
, in Appendix A to the
Prospectus and on page 
136 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 April 30, 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
22% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 22.00%
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 for
Class N 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
for Class C shares for the ten-year period reflects the conversion to Class A shares after eight years. 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 primarily invests in common stocks of U.S. companies. The Fund generally invests in securities of larger
capitalization companies in any industry. Harris Associates L.P. (“Harris Associates”) uses a value investment philosophy in selecting equity securities,
including common stocks. This value investment philosophy is based upon the belief that, over time, a company’s stock price converges with the company’s
intrinsic value. By “intrinsic value,” Harris Associates means its estimate of the price a knowledgeable buyer would pay to acquire the entire business. Harris
Associates believes that investing in securities priced significantly below what Harris Associates believes is a company’s intrinsic value presents the best
opportunity to achieve the Fund’s investment objectives.
Harris Associates uses this value investment philosophy to identify companies that it believes have discounted stock prices compared to what Harris
Associates believes are the companies’ intrinsic values. In assessing such companies, Harris Associates looks for the following characteristics, although not
all of the companies selected will have these attributes: (1) free cash flows and intelligent investment of excess cash; (2) earnings that are growing and are
reasonably predictable; and (3) high level of company management ownership.
Once Harris Associates identifies a stock that it believes is selling at a significant discount to Harris Associates’ estimate of intrinsic value and that the issuer
has one or more of the additional qualities mentioned above, Harris Associates generally will consider buying that security for the Fund. Harris Associates
usually sells a security when the price approaches its estimated value or the issuer’s fundamentals change. Harris Associates monitors each holding and
adjusts its price targets as warranted to reflect changes in the issuer’s fundamentals. The Fund’s portfolio typically holds 30 to 60 stocks.
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. 
Value stocks can perform differently from the
market as a whole and from other types of stocks. Value stocks also present the risk that their lower valuations fairly reflect their business prospects and that
investors will not agree that the stocks represent favorable investment opportunities, and they may fall out of favor with investors and underperform growth
stocks during any given period. 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.
Focused Investment Risk:
Because the Fund may invest in a small number of industries or securities, it may have more risk because the impact of a single
economic, political or regulatory occurrence may have a greater adverse impact on the Fund’s net asset value.
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.
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.
Management Risk:
A strategy used by the Fund’s 
portfolio managers may fail to produce the intended result.
 
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
.
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, five-year, ten-year, and life-of-class periods (as applicable) compare to those
of
a broad measure of market performance.
Class C shares will automatically convert to Class A shares after eight years
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.
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, five-year, ten-year, and life-of-class 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:

Fourth Quarter 2020,
23.76%



Lowest Quarterly Return:

First Quarter 2020,
-29.68%
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 Fund 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.
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 Fund 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.
Natixis Oakmark 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_RedemptionFee none
Management fees rr_ManagementFeesOverAssets 0.69%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 1.20%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2],[3]
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 934
5 years rr_ExpenseExampleYear05 1,197
10 years rr_ExpenseExampleYear10 $ 1,946
Past 1 Year rr_AverageAnnualReturnYear01 6.51%
Past 5 Years rr_AverageAnnualReturnYear05 10.91%
Past 10 Years rr_AverageAnnualReturnYear10 10.90%
Natixis Oakmark 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_RedemptionFee none
Management fees rr_ManagementFeesOverAssets 0.69%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 1.95%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2],[3]
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 612
5 years rr_ExpenseExampleYear05 1,052
10 years rr_ExpenseExampleYear10 2,080
1 year rr_ExpenseExampleNoRedemptionYear01 198
3 years rr_ExpenseExampleNoRedemptionYear03 612
5 years rr_ExpenseExampleNoRedemptionYear05 1,052
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,080
Past 1 Year rr_AverageAnnualReturnYear01 11.15%
Past 5 Years rr_AverageAnnualReturnYear05 11.40%
Past 10 Years rr_AverageAnnualReturnYear10 10.90%
Natixis Oakmark 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_RedemptionFee none
Management fees rr_ManagementFeesOverAssets 0.69%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.36%
Total annual fund operating expenses rr_ExpensesOverAssets 1.05%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.19% [2],[3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.86%
1 year rr_ExpenseExampleYear01 $ 88
3 years rr_ExpenseExampleYear03 315
5 years rr_ExpenseExampleYear05 561
10 years rr_ExpenseExampleYear10 $ 1,265
Past 1 Year rr_AverageAnnualReturnYear01 13.41%
Life of Class N rr_AverageAnnualReturnSinceInception 10.77%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2017
Natixis Oakmark 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_RedemptionFee none
Management fees rr_ManagementFeesOverAssets 0.69%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.26% [4]
Total annual fund operating expenses rr_ExpensesOverAssets 1.20%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2],[3]
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 621
5 years rr_ExpenseExampleYear05 893
10 years rr_ExpenseExampleYear10 $ 1,668
Past 1 Year rr_AverageAnnualReturnYear01 10.17%
Past 5 Years rr_AverageAnnualReturnYear05 11.68%
Past 10 Years rr_AverageAnnualReturnYear10 11.28%
Natixis Oakmark 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_RedemptionFee none
Management fees rr_ManagementFeesOverAssets 0.69%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 0.95%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2],[3]
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 303
5 years rr_ExpenseExampleYear05 525
10 years rr_ExpenseExampleYear10 $ 1,166
2011 rr_AnnualReturn2011 (1.40%)
2012 rr_AnnualReturn2012 17.33%
2013 rr_AnnualReturn2013 38.21%
2014 rr_AnnualReturn2014 10.70%
2015 rr_AnnualReturn2015 (4.18%)
2016 rr_AnnualReturn2016 18.69%
2017 rr_AnnualReturn2017 21.05%
2018 rr_AnnualReturn2018 (12.76%)
2019 rr_AnnualReturn2019 27.06%
2020 rr_AnnualReturn2020 13.28%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.76%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.68%)
Past 1 Year rr_AverageAnnualReturnYear01 13.28%
Past 5 Years rr_AverageAnnualReturnYear05 12.52%
Past 10 Years rr_AverageAnnualReturnYear10 11.83%
Natixis Oakmark Fund | Return After Taxes on Distributions | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 11.05%
Past 5 Years rr_AverageAnnualReturnYear05 10.65%
Past 10 Years rr_AverageAnnualReturnYear10 10.29%
Natixis Oakmark Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 9.41%
Past 5 Years rr_AverageAnnualReturnYear05 9.72%
Past 10 Years rr_AverageAnnualReturnYear10 9.49%
Natixis Oakmark Fund | S&P 500® Index  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 18.40%
Past 5 Years rr_AverageAnnualReturnYear05 15.22%
Past 10 Years rr_AverageAnnualReturnYear10 13.88%
Life of Class N rr_AverageAnnualReturnSinceInception 15.30%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 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] 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 April 30, 2022 and may be terminated before then only with the consent of the Fund’s Board of Trustees.
[3] The Fund’s investment adviser has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 1.30%, 2.05%, 1.00%, 1.30% and 1.05% 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 April 30, 2022 and may be terminated before then only with the consent of the Fund’s Board of Trustees. The Fund’s investment 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.
[4] Other expenses for Class T shares are estimated for the current fiscal year.