This semi-annual shareholder report contains important information about Mirova Global Megatrends Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

You can find additional information (including tax information) about the Fund at im.natixis.com/funddocuments. You can also request the information by contacting us at (800) 225-5478 or by contacting your financial intermediary directly.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">im.natixis.com/funddocuments</span>

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class A	$60	1.21%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 60

Expense Ratio, Percent

1.21%

AssetsNet

$ 659,133,355

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,880,653

InvestmentCompanyPortfolioTurnover

12.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$659,133,355
# of Portfolio Holdings (including overnight repurchase agreements)53
Portfolio Turnover Rate12%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,880,653

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	20.4%
Commercial Services & Supplies	3.4%
Specialty Retail	3.8%
Life Sciences Tools & Services	3.9%
Machinery	4.2%
Pharmaceuticals	4.8%
Electrical Equipment	5.7%
Chemicals	5.8%
Financial Services	6.1%
Health Care Equipment & Supplies	6.4%
Electric Utilities	6.6%
Software	9.4%
Semiconductors & Semiconductor Equipment	19.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	4.5%
Japan	3.0%
United Kingdom	3.0%
Spain	3.2%
Germany	3.3%
France	4.1%
Canada	4.2%
Netherlands	4.6%
Taiwan	4.7%
United States	65.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	6.8%
Taiwan Semiconductor Manufacturing Co. Ltd., ADR	4.7%
Mastercard, Inc., Class A	3.7%
Microsoft Corp.	3.5%
Palo Alto Networks, Inc.	3.4%
Eli Lilly & Co.	3.2%
Iberdrola SA	3.2%
ASML Holding NV	3.0%
Broadcom, Inc.	2.7%
Vertiv Holdings Co., Class A	2.6%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000167846

Shareholder Report [Line Items]

Fund Name

Mirova Global Megatrends Fund

Class Name

Class C

Trading Symbol

ESGCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Mirova Global Megatrends Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class C	$98	1.96%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 98

Expense Ratio, Percent

1.96%

AssetsNet

$ 659,133,355

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,880,653

InvestmentCompanyPortfolioTurnover

12.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$659,133,355
# of Portfolio Holdings (including overnight repurchase agreements)53
Portfolio Turnover Rate12%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,880,653

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	20.4%
Commercial Services & Supplies	3.4%
Specialty Retail	3.8%
Life Sciences Tools & Services	3.9%
Machinery	4.2%
Pharmaceuticals	4.8%
Electrical Equipment	5.7%
Chemicals	5.8%
Financial Services	6.1%
Health Care Equipment & Supplies	6.4%
Electric Utilities	6.6%
Software	9.4%
Semiconductors & Semiconductor Equipment	19.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	4.5%
Japan	3.0%
United Kingdom	3.0%
Spain	3.2%
Germany	3.3%
France	4.1%
Canada	4.2%
Netherlands	4.6%
Taiwan	4.7%
United States	65.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	6.8%
Taiwan Semiconductor Manufacturing Co. Ltd., ADR	4.7%
Mastercard, Inc., Class A	3.7%
Microsoft Corp.	3.5%
Palo Alto Networks, Inc.	3.4%
Eli Lilly & Co.	3.2%
Iberdrola SA	3.2%
ASML Holding NV	3.0%
Broadcom, Inc.	2.7%
Vertiv Holdings Co., Class A	2.6%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000190736

Shareholder Report [Line Items]

Fund Name

Mirova Global Megatrends Fund

Class Name

Class N

Trading Symbol

ESGNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Mirova Global Megatrends Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class N	$45	0.90%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.90%

AssetsNet

$ 659,133,355

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,880,653

InvestmentCompanyPortfolioTurnover

12.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$659,133,355
# of Portfolio Holdings (including overnight repurchase agreements)53
Portfolio Turnover Rate12%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,880,653

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	20.4%
Commercial Services & Supplies	3.4%
Specialty Retail	3.8%
Life Sciences Tools & Services	3.9%
Machinery	4.2%
Pharmaceuticals	4.8%
Electrical Equipment	5.7%
Chemicals	5.8%
Financial Services	6.1%
Health Care Equipment & Supplies	6.4%
Electric Utilities	6.6%
Software	9.4%
Semiconductors & Semiconductor Equipment	19.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	4.5%
Japan	3.0%
United Kingdom	3.0%
Spain	3.2%
Germany	3.3%
France	4.1%
Canada	4.2%
Netherlands	4.6%
Taiwan	4.7%
United States	65.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	6.8%
Taiwan Semiconductor Manufacturing Co. Ltd., ADR	4.7%
Mastercard, Inc., Class A	3.7%
Microsoft Corp.	3.5%
Palo Alto Networks, Inc.	3.4%
Eli Lilly & Co.	3.2%
Iberdrola SA	3.2%
ASML Holding NV	3.0%
Broadcom, Inc.	2.7%
Vertiv Holdings Co., Class A	2.6%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000167847

Shareholder Report [Line Items]

Fund Name

Mirova Global Megatrends Fund

Class Name

Class Y

Trading Symbol

ESGYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Mirova Global Megatrends Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class Y	$48	0.96%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 48

Expense Ratio, Percent

0.96%

AssetsNet

$ 659,133,355

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 2,880,653

InvestmentCompanyPortfolioTurnover

12.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$659,133,355
# of Portfolio Holdings (including overnight repurchase agreements)53
Portfolio Turnover Rate12%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,880,653

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	20.4%
Commercial Services & Supplies	3.4%
Specialty Retail	3.8%
Life Sciences Tools & Services	3.9%
Machinery	4.2%
Pharmaceuticals	4.8%
Electrical Equipment	5.7%
Chemicals	5.8%
Financial Services	6.1%
Health Care Equipment & Supplies	6.4%
Electric Utilities	6.6%
Software	9.4%
Semiconductors & Semiconductor Equipment	19.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	4.5%
Japan	3.0%
United Kingdom	3.0%
Spain	3.2%
Germany	3.3%
France	4.1%
Canada	4.2%
Netherlands	4.6%
Taiwan	4.7%
United States	65.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	6.8%
Taiwan Semiconductor Manufacturing Co. Ltd., ADR	4.7%
Mastercard, Inc., Class A	3.7%
Microsoft Corp.	3.5%
Palo Alto Networks, Inc.	3.4%
Eli Lilly & Co.	3.2%
Iberdrola SA	3.2%
ASML Holding NV	3.0%
Broadcom, Inc.	2.7%
Vertiv Holdings Co., Class A	2.6%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000094872

Shareholder Report [Line Items]

Fund Name

Natixis Oakmark International Fund

Class Name

Class A

Trading Symbol

NOIAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis Oakmark International Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class A	$66	1.32%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 66

Expense Ratio, Percent

1.32%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 246,697,371

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 771,464

InvestmentCompanyPortfolioTurnover

30.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$246,697,371
# of Portfolio Holdings (including overnight repurchase agreements)59
Portfolio Turnover Rate30%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$771,464

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.1%
Short-Term Investments	3.2%
Household Products	3.5%
Software	4.2%
Chemicals	4.2%
Pharmaceuticals	4.2%
Insurance	4.4%
Broadline Retail	5.1%
Beverages	5.4%
Hotels, Restaurants & Leisure	5.5%
Machinery	5.6%
Trading Companies & Distributors	8.0%
Banks	8.1%
Textiles, Apparel & Luxury Goods	8.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	12.1%
Switzerland	3.0%
Korea	4.7%
Japan	5.5%
Netherlands	7.7%
United States	8.1%
United Kingdom	15.6%
France	20.9%
Germany	22.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
BNP Paribas SA	3.4%
adidas AG	3.1%
Compass Group PLC	2.9%
Sunbelt Rentals Holdings, Inc.	2.7%
Symrise AG	2.7%
Accor SA	2.6%
SAP SE	2.5%
Reckitt Benckiser Group PLC	2.5%
LVMH Moet Hennessy Louis Vuitton SE	2.4%
DSV AS	2.3%

Material Fund Change [Text Block]

Material Fund Changes

For the six months ended June 30, 2026, the Fund had the following material changes, which were reported in a supplement to the Fund's prospectus. For more information, you may review the Fund's prospectus at im.natixis.com/funddocuments or upon request at (800) 225-5478 or through your financial intermediary.

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets will be 0.73% on the first $1 billion of assets, and 0.70% thereafter. The sub-advisory fee rate as a percentage of average daily net assets will be 0.50% on the first $1 billion of assets, and 0.45% thereafter.

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">im.natixis.com/funddocuments</span>

C000094873

Shareholder Report [Line Items]

Fund Name

Natixis Oakmark International Fund

Class Name

Class C

Trading Symbol

NOICX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis Oakmark International Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class C	$103	2.08%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 103

Expense Ratio, Percent

2.08%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 246,697,371

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 771,464

InvestmentCompanyPortfolioTurnover

30.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$246,697,371
# of Portfolio Holdings (including overnight repurchase agreements)59
Portfolio Turnover Rate30%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$771,464

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.1%
Short-Term Investments	3.2%
Household Products	3.5%
Software	4.2%
Chemicals	4.2%
Pharmaceuticals	4.2%
Insurance	4.4%
Broadline Retail	5.1%
Beverages	5.4%
Hotels, Restaurants & Leisure	5.5%
Machinery	5.6%
Trading Companies & Distributors	8.0%
Banks	8.1%
Textiles, Apparel & Luxury Goods	8.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	12.1%
Switzerland	3.0%
Korea	4.7%
Japan	5.5%
Netherlands	7.7%
United States	8.1%
United Kingdom	15.6%
France	20.9%
Germany	22.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
BNP Paribas SA	3.4%
adidas AG	3.1%
Compass Group PLC	2.9%
Sunbelt Rentals Holdings, Inc.	2.7%
Symrise AG	2.7%
Accor SA	2.6%
SAP SE	2.5%
Reckitt Benckiser Group PLC	2.5%
LVMH Moet Hennessy Louis Vuitton SE	2.4%
DSV AS	2.3%

Material Fund Change [Text Block]

Material Fund Changes

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address

C000190734

Shareholder Report [Line Items]

Fund Name

Natixis Oakmark International Fund

Class Name

Class N

Trading Symbol

NIONX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis Oakmark International Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class N	$52	1.04%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

1.04%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 246,697,371

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 771,464

InvestmentCompanyPortfolioTurnover

30.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$246,697,371
# of Portfolio Holdings (including overnight repurchase agreements)59
Portfolio Turnover Rate30%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$771,464

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.1%
Short-Term Investments	3.2%
Household Products	3.5%
Software	4.2%
Chemicals	4.2%
Pharmaceuticals	4.2%
Insurance	4.4%
Broadline Retail	5.1%
Beverages	5.4%
Hotels, Restaurants & Leisure	5.5%
Machinery	5.6%
Trading Companies & Distributors	8.0%
Banks	8.1%
Textiles, Apparel & Luxury Goods	8.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	12.1%
Switzerland	3.0%
Korea	4.7%
Japan	5.5%
Netherlands	7.7%
United States	8.1%
United Kingdom	15.6%
France	20.9%
Germany	22.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
BNP Paribas SA	3.4%
adidas AG	3.1%
Compass Group PLC	2.9%
Sunbelt Rentals Holdings, Inc.	2.7%
Symrise AG	2.7%
Accor SA	2.6%
SAP SE	2.5%
Reckitt Benckiser Group PLC	2.5%
LVMH Moet Hennessy Louis Vuitton SE	2.4%
DSV AS	2.3%

Material Fund Change [Text Block]

Material Fund Changes

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address

C000190735

Shareholder Report [Line Items]

Fund Name

Natixis Oakmark International Fund

Class Name

Class Y

Trading Symbol

NOIYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis Oakmark International Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class Y	$53	1.06%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.06%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 246,697,371

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 771,464

InvestmentCompanyPortfolioTurnover

30.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$246,697,371
# of Portfolio Holdings (including overnight repurchase agreements)59
Portfolio Turnover Rate30%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$771,464

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.1%
Short-Term Investments	3.2%
Household Products	3.5%
Software	4.2%
Chemicals	4.2%
Pharmaceuticals	4.2%
Insurance	4.4%
Broadline Retail	5.1%
Beverages	5.4%
Hotels, Restaurants & Leisure	5.5%
Machinery	5.6%
Trading Companies & Distributors	8.0%
Banks	8.1%
Textiles, Apparel & Luxury Goods	8.5%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Country Weightings

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	12.1%
Switzerland	3.0%
Korea	4.7%
Japan	5.5%
Netherlands	7.7%
United States	8.1%
United Kingdom	15.6%
France	20.9%
Germany	22.4%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
BNP Paribas SA	3.4%
adidas AG	3.1%
Compass Group PLC	2.9%
Sunbelt Rentals Holdings, Inc.	2.7%
Symrise AG	2.7%
Accor SA	2.6%
SAP SE	2.5%
Reckitt Benckiser Group PLC	2.5%
LVMH Moet Hennessy Louis Vuitton SE	2.4%
DSV AS	2.3%

Material Fund Change [Text Block]

Material Fund Changes

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address

C000018161

Shareholder Report [Line Items]

Fund Name

Natixis U.S. Equity Opportunities Fund

Class Name

Class A

Trading Symbol

NEFSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis U.S. Equity Opportunities Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class A	$52	1.06%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

1.06%

AssetsNet

$ 1,157,855,419

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 4,080,214

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,157,855,419
# of Portfolio Holdings (including overnight repurchase agreements)74
Portfolio Turnover Rate14%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$4,080,214

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.9%
Insurance	3.2%
Pharmaceuticals	3.2%
Entertainment	3.6%
Broadline Retail	3.7%
Oil, Gas & Consumable Fuels	4.2%
Automobiles	4.7%
Beverages	5.1%
Financial Services	5.5%
Capital Markets	6.4%
Banks	6.5%
Semiconductors & Semiconductor Equipment	7.5%
Software	7.5%
Interactive Media & Services	8.0%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	5.7%
Alphabet, Inc., Class A	5.1%
Amazon.com, Inc.	3.7%
Tesla, Inc.	3.5%
Meta Platforms, Inc., Class A	2.9%
Netflix, Inc.	2.8%
Citigroup, Inc.	2.2%
Keurig Dr. Pepper, Inc.	2.1%
Salesforce, Inc.	2.1%
Monster Beverage Corp.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000018163

Shareholder Report [Line Items]

Fund Name

Natixis U.S. Equity Opportunities Fund

Class Name

Class C

Trading Symbol

NECCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis U.S. Equity Opportunities Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class C	$89	1.81%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 89

Expense Ratio, Percent

1.81%

AssetsNet

$ 1,157,855,419

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 4,080,214

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,157,855,419
# of Portfolio Holdings (including overnight repurchase agreements)74
Portfolio Turnover Rate14%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$4,080,214

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.9%
Insurance	3.2%
Pharmaceuticals	3.2%
Entertainment	3.6%
Broadline Retail	3.7%
Oil, Gas & Consumable Fuels	4.2%
Automobiles	4.7%
Beverages	5.1%
Financial Services	5.5%
Capital Markets	6.4%
Banks	6.5%
Semiconductors & Semiconductor Equipment	7.5%
Software	7.5%
Interactive Media & Services	8.0%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	5.7%
Alphabet, Inc., Class A	5.1%
Amazon.com, Inc.	3.7%
Tesla, Inc.	3.5%
Meta Platforms, Inc., Class A	2.9%
Netflix, Inc.	2.8%
Citigroup, Inc.	2.2%
Keurig Dr. Pepper, Inc.	2.1%
Salesforce, Inc.	2.1%
Monster Beverage Corp.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000190732

Shareholder Report [Line Items]

Fund Name

Natixis U.S. Equity Opportunities Fund

Class Name

Class N

Trading Symbol

NESNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis U.S. Equity Opportunities Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class N	$37	0.76%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.76%

AssetsNet

$ 1,157,855,419

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 4,080,214

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,157,855,419
# of Portfolio Holdings (including overnight repurchase agreements)74
Portfolio Turnover Rate14%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$4,080,214

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.9%
Insurance	3.2%
Pharmaceuticals	3.2%
Entertainment	3.6%
Broadline Retail	3.7%
Oil, Gas & Consumable Fuels	4.2%
Automobiles	4.7%
Beverages	5.1%
Financial Services	5.5%
Capital Markets	6.4%
Banks	6.5%
Semiconductors & Semiconductor Equipment	7.5%
Software	7.5%
Interactive Media & Services	8.0%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	5.7%
Alphabet, Inc., Class A	5.1%
Amazon.com, Inc.	3.7%
Tesla, Inc.	3.5%
Meta Platforms, Inc., Class A	2.9%
Netflix, Inc.	2.8%
Citigroup, Inc.	2.2%
Keurig Dr. Pepper, Inc.	2.1%
Salesforce, Inc.	2.1%
Monster Beverage Corp.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000018164

Shareholder Report [Line Items]

Fund Name

Natixis U.S. Equity Opportunities Fund

Class Name

Class Y

Trading Symbol

NESYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Natixis U.S. Equity Opportunities Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class Y	$40	0.81%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.81%

AssetsNet

$ 1,157,855,419

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 4,080,214

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,157,855,419
# of Portfolio Holdings (including overnight repurchase agreements)74
Portfolio Turnover Rate14%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$4,080,214

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	30.9%
Insurance	3.2%
Pharmaceuticals	3.2%
Entertainment	3.6%
Broadline Retail	3.7%
Oil, Gas & Consumable Fuels	4.2%
Automobiles	4.7%
Beverages	5.1%
Financial Services	5.5%
Capital Markets	6.4%
Banks	6.5%
Semiconductors & Semiconductor Equipment	7.5%
Software	7.5%
Interactive Media & Services	8.0%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
NVIDIA Corp.	5.7%
Alphabet, Inc., Class A	5.1%
Amazon.com, Inc.	3.7%
Tesla, Inc.	3.5%
Meta Platforms, Inc., Class A	2.9%
Netflix, Inc.	2.8%
Citigroup, Inc.	2.2%
Keurig Dr. Pepper, Inc.	2.1%
Salesforce, Inc.	2.1%
Monster Beverage Corp.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000018172

Shareholder Report [Line Items]

Fund Name

Vaughan Nelson Small Cap Fund

Class Name

Class A

Trading Symbol

NEFJX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Vaughan Nelson Small Cap Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class A	$66	1.25%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 66

Expense Ratio, Percent

1.25%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 1,523,241,726

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,003,150

InvestmentCompanyPortfolioTurnover

96.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,523,241,726
# of Portfolio Holdings (including overnight repurchase agreements)67
Portfolio Turnover Rate96%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$6,003,150

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	35.4%
Exchange-Traded Funds	4.8%
Aerospace & Defense	3.0%
Trading Companies & Distributors	3.2%
Gas Utilities	3.3%
Capital Markets	3.5%
Life Sciences Tools & Services	4.4%
Chemicals	4.7%
Insurance	4.8%
Machinery	5.1%
Specialty Retail	5.7%
Hotels, Restaurants & Leisure	5.9%
Banks	16.2%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
iShares Russell 2000 Value ETF	4.8%
Revvity, Inc.	2.6%
Sensient Technologies Corp.	2.6%
Carlisle Cos., Inc.	2.6%
Garrett Motion, Inc.	2.4%
GATX Corp.	2.4%
Cushman & Wakefield Ltd.	2.3%
Valmont Industries, Inc.	2.2%
Coca-Cola Consolidated, Inc.	2.2%
Valvoline, Inc.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Material Fund Change Expenses [Text Block]

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address

C000018174

Shareholder Report [Line Items]

Fund Name

Vaughan Nelson Small Cap Fund

Class Name

Class C

Trading Symbol

NEJCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Vaughan Nelson Small Cap Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class C	$105	2.00%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 105

Expense Ratio, Percent

2.00%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 1,523,241,726

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,003,150

InvestmentCompanyPortfolioTurnover

96.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,523,241,726
# of Portfolio Holdings (including overnight repurchase agreements)67
Portfolio Turnover Rate96%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$6,003,150

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	35.4%
Exchange-Traded Funds	4.8%
Aerospace & Defense	3.0%
Trading Companies & Distributors	3.2%
Gas Utilities	3.3%
Capital Markets	3.5%
Life Sciences Tools & Services	4.4%
Chemicals	4.7%
Insurance	4.8%
Machinery	5.1%
Specialty Retail	5.7%
Hotels, Restaurants & Leisure	5.9%
Banks	16.2%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
iShares Russell 2000 Value ETF	4.8%
Revvity, Inc.	2.6%
Sensient Technologies Corp.	2.6%
Carlisle Cos., Inc.	2.6%
Garrett Motion, Inc.	2.4%
GATX Corp.	2.4%
Cushman & Wakefield Ltd.	2.3%
Valmont Industries, Inc.	2.2%
Coca-Cola Consolidated, Inc.	2.2%
Valvoline, Inc.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Material Fund Change Expenses [Text Block]

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address

C000190733

Shareholder Report [Line Items]

Fund Name

Vaughan Nelson Small Cap Fund

Class Name

Class N

Trading Symbol

VSCNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Vaughan Nelson Small Cap Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class N	$50	0.95%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.95%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 1,523,241,726

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,003,150

InvestmentCompanyPortfolioTurnover

96.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,523,241,726
# of Portfolio Holdings (including overnight repurchase agreements)67
Portfolio Turnover Rate96%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$6,003,150

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	35.4%
Exchange-Traded Funds	4.8%
Aerospace & Defense	3.0%
Trading Companies & Distributors	3.2%
Gas Utilities	3.3%
Capital Markets	3.5%
Life Sciences Tools & Services	4.4%
Chemicals	4.7%
Insurance	4.8%
Machinery	5.1%
Specialty Retail	5.7%
Hotels, Restaurants & Leisure	5.9%
Banks	16.2%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
iShares Russell 2000 Value ETF	4.8%
Revvity, Inc.	2.6%
Sensient Technologies Corp.	2.6%
Carlisle Cos., Inc.	2.6%
Garrett Motion, Inc.	2.4%
GATX Corp.	2.4%
Cushman & Wakefield Ltd.	2.3%
Valmont Industries, Inc.	2.2%
Coca-Cola Consolidated, Inc.	2.2%
Valvoline, Inc.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Material Fund Change Expenses [Text Block]

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address

C000069268

Shareholder Report [Line Items]

Fund Name

Vaughan Nelson Small Cap Fund

Class Name

Class Y

Trading Symbol

NEJYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Vaughan Nelson Small Cap Fund for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

(800) 225-5478

Additional Information Website

Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference†}
Class Y	$53	1.00%

Footnote	Description
Footnote^†	Annualized for periods less than one year (if applicable).

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.00%

Material Change Date

Jun. 30, 2026

AssetsNet

$ 1,523,241,726

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 6,003,150

InvestmentCompanyPortfolioTurnover

96.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,523,241,726
# of Portfolio Holdings (including overnight repurchase agreements)67
Portfolio Turnover Rate96%
Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$6,003,150

Holdings [Text Block]

Industry Summary

Table Summary
Value	Value
Other investments less than 3% of net assets^{Footnote Reference*}	35.4%
Exchange-Traded Funds	4.8%
Aerospace & Defense	3.0%
Trading Companies & Distributors	3.2%
Gas Utilities	3.3%
Capital Markets	3.5%
Life Sciences Tools & Services	4.4%
Chemicals	4.7%
Insurance	4.8%
Machinery	5.1%
Specialty Retail	5.7%
Hotels, Restaurants & Leisure	5.9%
Banks	16.2%

Footnote	Description
Footnote^*	Net of other assets less liabilities

Largest Holdings [Text Block]

Top Ten Holdings

Table Summary
iShares Russell 2000 Value ETF	4.8%
Revvity, Inc.	2.6%
Sensient Technologies Corp.	2.6%
Carlisle Cos., Inc.	2.6%
Garrett Motion, Inc.	2.4%
GATX Corp.	2.4%
Cushman & Wakefield Ltd.	2.3%
Valmont Industries, Inc.	2.2%
Coca-Cola Consolidated, Inc.	2.2%
Valvoline, Inc.	2.1%

Material Fund Change [Text Block]

Material Fund Changes

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Material Fund Change Expenses [Text Block]

Fees: Effective July 1, 2026, the advisory fee rate as a percentage of average daily net assets was reduced from 0.85% to 0.83%.

Summary of Change Legend [Text Block]

Updated Prospectus Phone Number

(800) 225-5478

Updated Prospectus Web Address