Objective, Primary [Text Block]

rr_ProspectusTable

Objective [Heading]

rr_ObjectiveHeading

Investment Goal

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 33 of the Prospectus, in Appendix A to the Prospectus and on page 105 in the section “Reduced Sales Charges” of the Statement of Additional Information (“SAI”).

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 $50,000 in the Natixis Funds Complex.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

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, 2025

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.

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 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:

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 24% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

24.00%

Strategy [Heading]

rr_StrategyHeading

Investments, Risks and PerformancePrincipal 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. This 40% minimum investment amount may be reduced to 30% if market conditions for these investments or specific foreign markets are deemed unfavorable. 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 and the security’s country of incorporation 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 interests in real estate investment trusts (“REITs”) and securities issued pursuant to Rule 144A under the Securities Act of 1933 (“Rule 144A securities”). In addition, the Fund may gain investment exposure to Chinese companies through the use of a structure known as a variable interest entity (“VIE”). The VIE structure allows investors, such as the Fund, to gain exposure to sectors or industries where non-Chinese ownership is restricted or prohibited by the Chinese government. 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

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, life-of-class and life-of-fund 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. To the extent that a class of shares was subject to the waiver or reimbursement of certain expenses during a period, had such expenses not been waived or reimbursed during the period, total returns would have been lower.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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.

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index performance reflects no deduction for fees, expenses or taxes

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.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:
Second Quarter 2020, 26.23%

Lowest Quarterly Return:
Second Quarter 2022, -19.88%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns(for the periods ended December 31, 2023)

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.

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Equity Securities Risk [Member]

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Market/Issuer Risk [Member]

rr_RiskTextBlock

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. Securities of real estate-related companies and REITs in which the Fund may invest may be considered equity securities, thus subjecting the Fund to the risks of investing in equity securities generally.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Management Risk [Member]

rr_RiskTextBlock

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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Liquidity Risk [Member]

rr_RiskTextBlock

Management Risk: A strategy used by the Fund’s portfolio manager may fail to produce the intended result.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Foreign Securities Risk [Member]

rr_RiskTextBlock

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. Markets may become illiquid quickly. 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. During times of market turmoil, there may be no buyers or sellers for securities in certain asset classes. 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 OTC derivatives, are generally subject to liquidity risk as well. In other circumstances, liquid investments may become illiquid. Liquidity issues may also make it difficult to value the Fund’s investments. The Fund may invest in liquid investments that become illiquid due to financial distress, or geopolitical events such as sanctions, trading halts or wars.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Emerging Markets Risk [Member]

rr_RiskTextBlock

Foreign Securities Risk: Investments in foreign securities may be subject to greater political, economic, environmental, credit/counterparty and information risks. The Fund’s investments in foreign securities also are subject to foreign currency fluctuations and other foreign currency-related risks. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Small- and Mid-Capitalization Companies Risk [Member]

rr_RiskTextBlock

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, war, nationalization or confiscatory taxation, currency exchange or repatriation restrictions, sanctions by other countries (such as the United States or the European Union), new or inconsistent government treatment of or restrictions on issuers and instruments, and an issuer’s unwillingness or inability to make dividend, principal or interest payments on its securities. Emerging markets companies may be smaller and have shorter operating histories than companies in developed markets.

The Fund’s exposure to VIEs may pose additional risks because, instead of directly investing in the underlying Chinese operating company, the Fund’s investment is in a holding company domiciled outside of China. The holding company has contractual arrangements with the operating company that are expected to provide investors, such as the Fund, with economic exposure to the operating company. However, the VIE structure is not formally recognized under Chinese law. The Chinese government may cease to tolerate VIE structures at any time or impose new restrictions. Similarly, these investments may face delisting or other adverse actions under U.S. or other non-Chinese law. Any of these events may reduce the value of the Fund’s investments in these companies or render them valueless.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | REITs Risk [Member]

rr_RiskTextBlock

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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Large Investor Risk [Member]

rr_RiskTextBlock

REITs Risk: Investments in the real estate industry, including REITs, are particularly sensitive to economic downturns and are sensitive to factors such as changes in real estate values, property taxes and tax laws, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents and the management skill and creditworthiness of the issuer. Companies in the real estate industry also may be subject to liabilities under environmental and hazardous waste laws. In addition, the value of a REIT is affected by changes in the value of the properties owned by the REIT or mortgage loans held by the REIT. REITs are also subject to default and prepayment risk. Many REITs are highly leveraged, increasing their risk. The Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Currency Risk [Member]

rr_RiskTextBlock

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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Credit/Counterparty Risk [Member]

rr_RiskTextBlock

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 currency-related instruments 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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Cybersecurity and Technology Risk [Member]

rr_RiskTextBlock

sustain losses or be unable or delayed in its ability to realize gains. The Fund will be subject to credit/counterparty risk 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 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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Derivatives Risk [Member]

rr_RiskTextBlock

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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Leverage Risk [Member]

rr_RiskTextBlock

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 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 involves other risks, such as 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 any amounts paid or margin transferred 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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | MSCI All Country World Index (Net)

rr_RiskTextBlock

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.

rr_ProspectusTable

rr_AverageAnnualReturnYear01

22.20%

rr_AverageAnnualReturnYear05

11.72%

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class A

rr_AverageAnnualReturnSinceInception

10.04%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.38%

rr_ExpensesOverAssets

1.38%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.17%

^[2],[3]

rr_NetExpensesOverAssets

1.21%

rr_ExpenseExampleYear01

$ 691

rr_ExpenseExampleYear03

971

rr_ExpenseExampleYear05

1,272

rr_ExpenseExampleYear10

$ 2,123

rr_AverageAnnualReturnYear01

28.01%

rr_AverageAnnualReturnYear05

11.91%

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class C

rr_AverageAnnualReturnSinceInception

11.20%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.39%

rr_ExpensesOverAssets

2.14%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.18%

^[2],[3]

rr_NetExpensesOverAssets

1.96%

rr_ExpenseExampleYear01

$ 299

rr_ExpenseExampleYear03

653

rr_ExpenseExampleYear05

1,133

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleYear10

2,265

rr_ExpenseExampleNoRedemptionYear01

199

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

653

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,133

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,265

rr_AverageAnnualReturnYear01

33.84%

rr_AverageAnnualReturnYear05

12.42%

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class N

rr_AverageAnnualReturnSinceInception

11.21%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.31%

rr_ExpensesOverAssets

1.06%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.15%

^[2],[3]

rr_NetExpensesOverAssets

0.91%

rr_ExpenseExampleYear01

$ 93

rr_ExpenseExampleYear03

322

rr_ExpenseExampleYear05

570

rr_ExpenseExampleYear10

$ 1,281

rr_AverageAnnualReturnYear01

36.20%

rr_AverageAnnualReturnYear05

13.60%

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class N | MSCI All Country World Index (Net)

rr_AverageAnnualReturnSinceInception

11.95%

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class T

rr_AverageAnnualReturnSinceInception

9.32%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

2.50%

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.38%

^[4]

rr_ExpensesOverAssets

1.38%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.17%

^[2],[3]

rr_NetExpensesOverAssets

1.21%

rr_ExpenseExampleYear01

$ 370

rr_ExpenseExampleYear03

660

rr_ExpenseExampleYear05

971

rr_ExpenseExampleYear10

$ 1,852

rr_AverageAnnualReturnYear01

32.44%

rr_AverageAnnualReturnYear05

12.68%

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class Y

rr_AverageAnnualReturnSinceInception

11.69%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.39%

rr_ExpensesOverAssets

1.14%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.18%

^[2],[3]

rr_NetExpensesOverAssets

0.96%

rr_ExpenseExampleYear01

$ 98

rr_ExpenseExampleYear03

344

rr_ExpenseExampleYear05

610

Highest Quarterly Return, Label

rr_ExpenseExampleYear10

$ 1,370

Annual Return 2017

rr_AnnualReturn2017

32.00%

Annual Return 2018

rr_AnnualReturn2018

(6.71%)

Annual Return 2019

rr_AnnualReturn2019

30.58%

Annual Return 2020

rr_AnnualReturn2020

35.33%

Annual Return 2021

rr_AnnualReturn2021

5.86%

Annual Return 2022

rr_AnnualReturn2022

(25.89%)

Annual Return 2023

rr_AnnualReturn2023

36.10%

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

26.23%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.88%)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2022

rr_AverageAnnualReturnYear01

36.10%

rr_AverageAnnualReturnYear05

13.54%

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class Y | Return After Taxes on Distributions

rr_AverageAnnualReturnSinceInception

12.34%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

36.10%

rr_AverageAnnualReturnYear05

12.16%

(Natixis Funds Trust II) | (Loomis Sayles Global Growth Fund) | Class Y | Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnSinceInception

11.07%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

21.37%

rr_AverageAnnualReturnYear05

10.69%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund)

rr_AverageAnnualReturnSinceInception

9.84%

Objective, Primary [Text Block]

rr_ProspectusTable

Objective [Heading]

rr_ObjectiveHeading

Investment Goal

rr_ObjectivePrimaryTextBlock

The Fund seeks to provide a high level of current income.

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 33 of the Prospectus, in Appendix A to the Prospectus and on page 105 in the section “Reduced Sales Charges” of the Statement of Additional Information (“SAI”).

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

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, 2025

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.

Other Expenses, New Fund, Based on Estimates [Text]

rr_OtherExpensesNewFundBasedOnEstimates

Other expenses for Class T shares are estimated for the current fiscal year.

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

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The expense information shown in the table above includes acquired fund fees and expenses of less than 0.01%; the ratios differ from the expense information disclosed in the Fund’s financial highlights table because the financial highlights table reflects the operating expenses of the Fund and does not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

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:

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

67.00%

Strategy [Heading]

rr_StrategyHeading

Investments, Risks and PerformancePrincipal 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 a combination of adjustable floating rate loans and other floating rate debt instruments issued by U.S. and non-U.S. corporations or other business entities and fixed-income securities, including derivatives that reference the returns of these instruments.

Under normal market conditions, the Fund will invest at least 65% of its net assets (plus any borrowings made for investment purposes) in floating rate loans that either hold a senior position in the capital structure of the borrower, hold an equal ranking with other senior debt, or have characteristics (such as a senior position secured by liens with other senior debt) that the Adviser believes justify treatment as senior debt (“Senior Loans”). The Fund may invest in Senior Loans directly as an original lender or by assignment from a lender, or it may invest indirectly through participation agreements, interests in collateralized loan obligations (“CLOs”) and derivatives that reference such instruments. Derivatives that reference the returns of Senior Loans may pay returns at fixed rather than variable rates. The Fund’s investments may also include, but are not limited to, subordinated loans, below investment grade corporate bonds and investment grade fixed-income debt securities. The fixed-income securities in which the Fund may invest include preferred stocks. The Fund may invest in pay-in-kind (“PIK”) securities and zero-coupon securities. The Fund may receive debt, equity or other securities or instruments as a result of the general restructuring of the debt of an issuer, the restructuring of a floating rate loan or as part of a package of securities acquired with a loan.

The Fund may invest any portion of its assets in securities of Canadian issuers and up to 20% of its net assets (plus any borrowings made for investment purposes) in other foreign securities, including up to 10% of its net assets (plus any borrowings made for investment purposes) in emerging market securities. Although certain securities purchased by the Fund may be issued by domestic companies incorporated outside of the United States, the Adviser does not consider these securities to be foreign if the issuer is included in the U.S. fixed-income indices published by Bloomberg.

Floating rate loans are debt obligations that have interest rates that adjust or “float” periodically (normally on a monthly or quarterly basis) based on a generally recognized base rate, such as the Secured Overnight Financing Rate (“SOFR”) or the prime rate offered by one or more major U.S. banks. Floating rate loans are generally unrated or rated less than investment grade and may be subject to restrictions on resale. The Fund may invest without limit in securities of any rating, including those that are in default. The Fund has no requirements as to the range of maturities of the debt instruments in which it can invest or as to the market capitalization of the issuers of those instruments.

The Fund may use derivative instruments, including, but not limited to, futures contracts, forward contracts, swaps (including, among others, credit default swap indices, loan-only credit default swaps and loan-only credit default swap indices) and structured notes to enhance income, to hedge against fluctuations in interest rates or currency exchange rates, and/or as a substitute for the purchase or sale of securities.

The Fund may also invest in securities issued pursuant to Rule 144A under the Securities Act of 1933 (“Rule 144A securities”), other privately placed investments such as private credit investments, convertible securities, exchange-traded funds (“ETFs”), and mortgage-related securities, including adjustable rate mortgage securities and collateralized mortgage obligations, asset-backed securities, and U.S. government securities (including its agencies, instrumentalities and sponsored entities). The Fund may also engage in currency-related transactions. Except as provided above, the Fund is not limited in the percentage of its assets that it may invest in these instruments.

When deciding which securities to buy and sell, the Adviser will consider credit quality and whether credit quality is improving or declining, as well as return potential, in the context of market and economic risks. In addition to security selection, the Adviser expects to use cycle evaluation in conjunction with sector rotation in an effort to enhance or offset cyclical influences.

The Fund expects to engage in active and frequent trading of securities and other instruments. Effects of frequent trading may include high transaction costs, which may lower the Fund’s return, and realization of short-term capital gains, distributions of which are taxable to shareholders who are individuals as ordinary income. Trading costs and tax effects associated with frequent trading may adversely affect the Fund’s performance.

With the exception of the 80% test described above, the percentage limitations set forth herein are not investment restrictions and the Fund may exceed these limits from time to time. In addition, when calculating these exposures, the Fund may use the notional value or an adjusted notional value of a derivative to reflect what the Adviser believes to be the most accurate assessment of the Fund’s real economic exposure.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

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-based securities market index that reflects the performance of the overall market applicable to the Fund and an additional index that represents the market sectors in which the Fund primarily invests. 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.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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.

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index performance reflects no deduction for fees, expenses or taxes

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

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.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:
Second Quarter 2020, 10.92%

Lowest Quarterly Return:
First Quarter 2020, -16.32%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns(for the periods ended December 31, 2023)

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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 Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Market/Issuer Risk [Member]

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Management Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Liquidity Risk [Member]

rr_RiskTextBlock

Management Risk: A strategy used by the Fund’s portfolio managers may fail to produce the intended result.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Foreign Securities Risk [Member]

rr_RiskTextBlock

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. Markets may become illiquid quickly. 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. During times of market turmoil, there may be no buyers or sellers for securities in certain asset classes. Securities acquired in a private placement, such as Rule 144A securities, and privately negotiated credit and other investments, 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 OTC derivatives, are generally subject to liquidity risk as well. In other circumstances, liquid investments may become illiquid. Liquidity issues may also make it difficult to value the Fund’s investments. The Fund may invest in liquid investments that become illiquid due to financial distress, or geopolitical events such as sanctions, trading halts or wars.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Emerging Markets Risk [Member]

rr_RiskTextBlock

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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Credit/Counterparty Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Cybersecurity and Technology Risk [Member]

rr_RiskTextBlock

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. In the event of bankruptcy of a borrower, the Fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing a Senior Loan. Senior Loans and other floating rate securities that are rated below investment-grade are considered predominantly speculative with respect to the ability of the issuer to make timely principal and interest payments. The value of loans made to such borrowers is likely to be more sensitive to adverse news about the borrower, markets or economy. 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 risk 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 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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Derivatives Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Leverage Risk [Member]

rr_RiskTextBlock

Derivatives Risk: Derivative instruments (such as those in which the Fund may invest, including futures contracts, forward contracts, swaps and structured notes) 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 involves other risks, such as 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 any amounts paid or margin transferred 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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Senior Loans Risk [Member]

rr_RiskTextBlock

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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Below Investment Grade Fixed-Income Securities Risk [Member]

rr_RiskTextBlock

Senior Loans Risk: The risks associated with Senior Loans are similar to the risks of investing in below investment-grade securities. The Senior Loans in which the Fund invests will generally not be rated investment grade by the rating agencies. Economic downturns generally lead to higher non-payment rates and a Senior Loan could lose a substantial part of its value prior to default. Senior Loans are subject to credit risk, and secured Senior Loans may not be adequately collateralized. The interest rates of Senior Loans reset frequently, and thus Senior Loans are subject to interest rate risk. Senior Loans are generally less liquid than many other debt securities and there may also be less public information available about Senior Loans as compared to other debt securities. Senior Loans may be difficult to value and may be subject to restrictions on resale, irregular trading activity, wide bid/ask spreads and extended trade settlement periods. Transactions in Senior Loans may take significantly longer than seven days to settle and, as a result, proceeds related to the sale of Senior Loans may not be readily available to make additional investments or to meet the Fund’s redemption obligations. In order to satisfy redemption requests pending settlement of Senior Loans, the Fund may take a variety of measures, including, without limitation drawing on its cash and other short term positions and borrowing from banks (including under the Fund’s line of credit), all of which may adversely affect the Fund’s performance. With limited exceptions, the Adviser will take steps intended to ensure that it does not receive material non-public information about the issuers of Senior Loans who also issue publicly traded securities, and therefore the Adviser may have less information than other investors about certain of the Senior Loans in which it seeks to invest. Investing in Senior Loan participations exposes the Fund to the credit of the counterparty issuing the participation in addition to the credit of the ultimate borrower.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Covenant-Lite Loan Risk [Member]

rr_RiskTextBlock

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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Interest Rate Risk [Member]

rr_RiskTextBlock

“Covenant-Lite” Loan Risk: Some of the loans in which the Fund invests or to which it otherwise gains exposure may be covenant-lite loans, which contain fewer or less restrictive constraints on the borrower than certain other types of loans.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Investments in Other Investment Companies Risk [Member]

rr_RiskTextBlock

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. Senior Loans typically have adjustable interest rates. As a result, it is expected that the values of Senior Loans held by the Fund will fluctuate less in response to interest rate changes than will fixed-rate debt securities; however, the interest rates paid by these loans will generally decrease if interest rates fall. On the other hand, because the interest rates paid on Senior Loans may be subject to floors or caps, changes in market interest rates will not necessarily increase the interest rates received from its Senior Loan investments. Senior Loans and other fixed-income securities are subject to the risk that borrowers pay off the debts sooner than expected, possibly requiring the Fund to re-invest in lower-yielding securities. The values of zero-coupon bonds may be more sensitive to fluctuations in interest rates than other fixed-income securities. 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 and/or central bank monetary policy and action may also affect the level of interest rates. Recently, there have been inflationary price movements, which have caused the fixed income securities markets to experience heightened levels of interest volatility and liquidity risk. Monetary policy measures have in the past, and may in the future, exacerbate risks associated with rising interest rates.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Mortgage-Related and Asset-Backed Securities Risk [Member]

rr_RiskTextBlock

Investments in Other Investment Companies Risk: The Fund will indirectly bear the management, service and other fees of any other investment companies, including exchange-traded funds, in which it invests in addition to its own expenses.

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Bloomberg U.S. Aggregate Bond Index

rr_RiskTextBlock

Mortgage-Related and Asset-Backed Securities Risk: In addition to the risks associated with investments in fixed-income securities generally (for example, credit, liquidity, inflation and valuation risk), mortgage-related and asset-backed securities are subject to the risks of the mortgages and assets underlying the securities as well as prepayment risk, the risk that the securities may be prepaid and result in the reinvestment of the prepaid amounts in

securities with lower yields than the prepaid obligations. Conversely, there is a risk that a rise in interest rates will extend the life of a mortgage-related or asset-backed security beyond the expected prepayment time, typically reducing the security’s value, which is called extension risk. The Fund also may incur a loss when there is a prepayment of securities that were purchased at a premium. The Fund’s investments in other asset-backed securities are subject to risks similar to those associated with mortgage-related securities, as well as additional risks associated with the nature of the assets and the servicing of those assets.

rr_ProspectusTable

rr_AverageAnnualReturnYear01

5.53%

^[5]

rr_AverageAnnualReturnYear05

1.10%

^[5]

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Morningstar LSTA US Leveraged Loan Index

rr_AverageAnnualReturnYear10

1.81%

^[5]

rr_ProspectusTable

rr_AverageAnnualReturnYear01

13.32%

rr_AverageAnnualReturnYear05

5.80%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class A

rr_AverageAnnualReturnYear10

4.42%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.50%

rr_MaximumDeferredSalesChargeOverOther

none

^[6]

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.60%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.32%

^[7]

rr_ExpensesOverAssets

1.17%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.16%

^[8],[9]

rr_NetExpensesOverAssets

1.01%

rr_ExpenseExampleYear01

$ 449

rr_ExpenseExampleYear03

693

rr_ExpenseExampleYear05

956

rr_ExpenseExampleYear10

$ 1,707

rr_AverageAnnualReturnYear01

8.13%

rr_AverageAnnualReturnYear05

2.71%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class C

rr_AverageAnnualReturnYear10

3.00%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.60%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.32%

^[7]

rr_ExpensesOverAssets

1.92%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.16%

^[8],[9]

rr_NetExpensesOverAssets

1.76%

rr_ExpenseExampleYear01

$ 279

rr_ExpenseExampleYear03

588

rr_ExpenseExampleYear05

1,022

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleYear10

2,035

rr_ExpenseExampleNoRedemptionYear01

179

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

588

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,022

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,035

rr_AverageAnnualReturnYear01

10.19%

rr_AverageAnnualReturnYear05

2.67%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class N

rr_AverageAnnualReturnYear10

2.74%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.60%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.29%

^[7]

rr_ExpensesOverAssets

0.89%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.18%

^[8],[9]

rr_NetExpensesOverAssets

0.71%

rr_ExpenseExampleYear01

$ 73

rr_ExpenseExampleYear03

266

rr_ExpenseExampleYear05

475

rr_ExpenseExampleYear10

$ 1,080

rr_AverageAnnualReturnYear01

12.35%

rr_AverageAnnualReturnYear05

3.74%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class N | Bloomberg U.S. Aggregate Bond Index

rr_AverageAnnualReturnSinceInception

3.38%

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class N | Morningstar LSTA US Leveraged Loan Index

rr_AverageAnnualReturnSinceInception

1.23%

^[5]

rr_ProspectusTable

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class T

rr_AverageAnnualReturnSinceInception

4.78%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

2.50%

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.60%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.32%

^[7],[10]

rr_ExpensesOverAssets

1.17%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.16%

^[8],[9]

rr_NetExpensesOverAssets

1.01%

rr_ExpenseExampleYear01

$ 350

rr_ExpenseExampleYear03

597

rr_ExpenseExampleYear05

863

rr_ExpenseExampleYear10

$ 1,621

rr_AverageAnnualReturnYear01

9.17%

rr_AverageAnnualReturnYear05

2.93%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class Y

rr_AverageAnnualReturnYear10

3.10%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.60%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.32%

^[7]

rr_ExpensesOverAssets

0.92%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.16%

^[8],[9]

rr_NetExpensesOverAssets

0.76%

rr_ExpenseExampleYear01

$ 78

rr_ExpenseExampleYear03

277

rr_ExpenseExampleYear05

494

Highest Quarterly Return, Label

rr_ExpenseExampleYear10

$ 1,117

Annual Return 2014

rr_AnnualReturn2014

2.41%

Annual Return 2015

rr_AnnualReturn2015

(1.14%)

Annual Return 2016

rr_AnnualReturn2016

11.51%

Annual Return 2017

rr_AnnualReturn2017

5.06%

Annual Return 2018

rr_AnnualReturn2018

0.39%

Annual Return 2019

rr_AnnualReturn2019

5.41%

Annual Return 2020

rr_AnnualReturn2020

1.42%

Annual Return 2021

rr_AnnualReturn2021

4.86%

Annual Return 2022

rr_AnnualReturn2022

(4.69%)

Annual Return 2023

rr_AnnualReturn2023

12.29%

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.92%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(16.32%)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

rr_AverageAnnualReturnYear01

12.29%

rr_AverageAnnualReturnYear05

3.71%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class Y | Return After Taxes on Distributions

rr_AverageAnnualReturnYear10

3.63%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

8.19%

rr_AverageAnnualReturnYear05

1.16%

(Natixis Funds Trust II) | (Loomis Sayles Senior Floating Rate and Fixed Income Fund) | Class Y | Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear10

1.07%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

7.16%

rr_AverageAnnualReturnYear05

1.72%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund)

rr_AverageAnnualReturnYear10

1.60%

Objective, Primary [Text Block]

rr_ProspectusTable

Objective [Heading]

rr_ObjectiveHeading

Investment Goal

rr_ObjectivePrimaryTextBlock

The Fund seeks long-term capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fund Fees & Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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 $50,000 in the Natixis Funds Complex.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

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, 2025

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.

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 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:

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

69.00%

Strategy [Heading]

rr_StrategyHeading

Investments, Risks and PerformancePrincipal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund, under normal market conditions, will invest primarily in equity securities, including common stocks, preferred stocks, limited partnership interests, interests in limited liability companies, real estate investment trusts (“REITs”) or other trusts and similar securities. The Fund is non-diversified, which means that it may invest a greater percentage of its assets in a particular issuer and may invest in fewer issuers than a diversified fund. Typically, the Fund’s portfolio will hold 20 to 40 securities. The Fund may invest in companies with any market capitalization, although, it will typically focus its investments in mid- to large-capitalization companies. While the Fund typically invests in equity securities, it may also invest in debt securities, including below investment grade fixed-income securities (commonly known as “junk bonds”). A fixed-income security is considered below investment grade quality when 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 top four ratings categories.

Vaughan Nelson Investment Management, L.P. (“Vaughan Nelson”) invests in companies of all market capitalizations with a focus on those companies meeting Vaughan Nelson’s return expectations.

Vaughan Nelson uses a bottom-up value oriented investment process in constructing the Fund’s portfolio. Vaughan Nelson seeks companies with the following characteristics, although not all of the companies selected will have these attributes:

•	Companies earning a positive return on capital with stable-to-improving returns.

•	Companies valued at discount to their asset value.

•	Companies with an attractive and sustainable dividend level.

In selecting investments for the Fund, Vaughan Nelson generally employs the following strategies:

•	Vaughan Nelson employs a value-driven investment philosophy that selects securities selling at a relatively low value based on discounted cash flow models. Vaughan Nelson selects companies that it believes are out-of-favor or misunderstood.

•	Vaughan Nelson starts with the entire U.S. exchange-traded equity investment universe. Vaughan Nelson then narrows the investment universe by using fundamental analysis to construct a portfolio of 20 to 40 securities.

•	Vaughan Nelson uses fundamental analysis to construct a portfolio that, in the opinion of Vaughan Nelson, is made up of quality companies with the potential to provide significant increases in share price over a three year period.

•	Vaughan Nelson will also employ its value driven investment philosophy to identify out-of-favor or misunderstood debt securities.

•	Vaughan Nelson will generally sell a security when it reaches Vaughan Nelson’s price target or when the issuer shows a change in financial condition, competitive pressures, poor management decisions or internal or external forces reducing future expected returns from the investment thesis.

The Fund also may:

•	Invest in convertible preferred stock and convertible debt securities.

•	Invest in publicly traded master limited partnerships.

•	Invest in foreign securities, including emerging market securities, traded in U.S. markets directly or through depositary receipt programs such as American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”).

•	Invest in REITs.

•	Invest in securities offered in initial public offerings (“IPOs”), securities issued pursuant to Rule 144A under the Securities Act of 1933 (“Rule 144A securities”) and other privately placed investments such as private equity investments.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

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.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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.

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index performance reflects no deduction for fees, expenses or taxes

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

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.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:
Second Quarter 2020, 25.72%

Lowest Quarterly Return:
First Quarter 2020, -21.55%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns(for the periods ended December 31, 2023)

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Equity Securities Risk [Member]

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Market/Issuer Risk [Member]

rr_RiskTextBlock

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. Securities issued in IPOs tend to involve greater market risk than other equity securities due, in part, to public perception and the lack of publicly available information and trading history. 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. Securities of real estate-related companies and REITs in which the Fund may invest may be considered equity securities, thus subjecting the Fund to the risks of investing in equity securities generally.

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Management Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Liquidity Risk [Member]

rr_RiskTextBlock

Management Risk: A strategy used by the Fund’s portfolio managers may fail to produce the intended result.

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Foreign Securities Risk [Member]

rr_RiskTextBlock

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. Markets may become illiquid quickly. 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. During times of market turmoil, there may be no buyers or sellers for securities in certain asset classes. Securities acquired in a private placement, such as Rule 144A securities, and privately negotiated credit and other investments, 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 OTC derivatives, are generally subject to liquidity risk as well. In other circumstances, liquid investments may become illiquid. Liquidity issues may also make it difficult to value the Fund’s investments. The Fund may invest in liquid investments that become illiquid due to financial distress, or geopolitical events such as sanctions, trading halts or wars.

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Emerging Markets Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | REITs Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Credit/Counterparty Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Cybersecurity and Technology Risk [Member]

rr_RiskTextBlock

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 risk 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.

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Leverage Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Below Investment Grade Fixed-Income Securities Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Interest Rate Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | S&P 500® Index

rr_RiskTextBlock

rr_ProspectusTable

rr_AverageAnnualReturnYear01

26.29%

rr_AverageAnnualReturnYear05

15.69%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class A

rr_AverageAnnualReturnYear10

12.03%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

rr_MaximumDeferredSalesChargeOverOther

none

^[11]

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.70%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.20%

rr_ExpensesOverAssets

1.15%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.05%

^[12],[13]

rr_NetExpensesOverAssets

1.10%

rr_ExpenseExampleYear01

$ 681

rr_ExpenseExampleYear03

915

rr_ExpenseExampleYear05

1,167

rr_ExpenseExampleYear10

$ 1,888

rr_AverageAnnualReturnYear01

14.93%

rr_AverageAnnualReturnYear05

14.93%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class C

rr_AverageAnnualReturnYear10

11.04%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.70%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.20%

rr_ExpensesOverAssets

1.90%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.05%

^[12],[13]

rr_NetExpensesOverAssets

1.85%

rr_ExpenseExampleYear01

$ 288

rr_ExpenseExampleYear03

592

rr_ExpenseExampleYear05

1,022

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleYear10

2,023

rr_ExpenseExampleNoRedemptionYear01

188

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

592

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,022

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,023

rr_AverageAnnualReturnYear01

20.05%

rr_AverageAnnualReturnYear05

15.44%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class N

rr_AverageAnnualReturnYear10

11.04%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.70%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.45%

rr_ExpensesOverAssets

1.15%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.35%

^[12],[13]

rr_NetExpensesOverAssets

0.80%

rr_ExpenseExampleYear01

$ 82

rr_ExpenseExampleYear03

331

rr_ExpenseExampleYear05

599

rr_ExpenseExampleYear10

$ 1,366

rr_AverageAnnualReturnYear01

22.35%

rr_AverageAnnualReturnYear05

16.64%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class N | S&P 500® Index

rr_AverageAnnualReturnSinceInception

13.74%

rr_ProspectusTable

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class T

rr_AverageAnnualReturnSinceInception

12.92%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

2.50%

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.70%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.20%

^[14]

rr_ExpensesOverAssets

1.15%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.05%

^[12],[13]

rr_NetExpensesOverAssets

1.10%

rr_ExpenseExampleYear01

$ 359

rr_ExpenseExampleYear03

601

rr_ExpenseExampleYear05

862

rr_ExpenseExampleYear10

$ 1,608

rr_AverageAnnualReturnYear01

18.95%

rr_AverageAnnualReturnYear05

15.72%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class Y

rr_AverageAnnualReturnYear10

11.42%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_RedemptionFee

none

rr_ManagementFeesOverAssets

0.70%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.20%

rr_ExpensesOverAssets

0.90%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.05%

^[12],[13]

rr_NetExpensesOverAssets

0.85%

rr_ExpenseExampleYear01

$ 87

rr_ExpenseExampleYear03

282

rr_ExpenseExampleYear05

494

Highest Quarterly Return, Label

rr_ExpenseExampleYear10

$ 1,103

Annual Return 2014

rr_AnnualReturn2014

10.76%

Annual Return 2015

rr_AnnualReturn2015

2.81%

Annual Return 2016

rr_AnnualReturn2016

6.94%

Annual Return 2017

rr_AnnualReturn2017

23.79%

Annual Return 2018

rr_AnnualReturn2018

(4.56%)

Annual Return 2019

rr_AnnualReturn2019

27.81%

Annual Return 2020

rr_AnnualReturn2020

18.59%

Annual Return 2021

rr_AnnualReturn2021

39.57%

Annual Return 2022

rr_AnnualReturn2022

(16.65%)

Annual Return 2023

rr_AnnualReturn2023

22.23%

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

25.72%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.55%)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

rr_AverageAnnualReturnYear01

22.23%

rr_AverageAnnualReturnYear05

16.60%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class Y | Return After Taxes on Distributions

rr_AverageAnnualReturnYear10

11.98%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

22.19%

rr_AverageAnnualReturnYear05

13.65%

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class Y | Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear10

9.90%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

13.19%

rr_AverageAnnualReturnYear05

12.62%