v3.25.2
Shareholder Report
 6 Months Ended 7 Months Ended
May 31, 2025
USD ($)
Holding
Jul. 01, 2025
Shareholder Report [Line Items]    
Document Type N-CSRS  
Amendment Flag false  
Registrant Name Natixis Funds Trust II  
Entity Central Index Key 0000052136  
Entity Investment Company Type N-1A  
Document Period End Date May 31, 2025  
C000167848    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Global Growth Fund  
Class Name Class A  
Trading Symbol LSAGX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Global Growth Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class A
$61
1.20%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 61  
Expense Ratio, Percent 1.20%  
AssetsNet $ 128,359,774  
Holdings Count | Holding 45  
Advisory Fees Paid, Amount $ 319,085  
InvestmentCompanyPortfolioTurnover 2.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$128,359,774
  • # of Portfolio Holdings (including overnight repurchase agreements)45
  • Portfolio Turnover Rate2%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$319,085
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.4%
Short-Term Investments
0.3%
Semiconductors & Semiconductor Equipment
3.6%
Aerospace & Defense
3.8%
Hotels, Restaurants & Leisure
3.9%
IT Services
4.4%
Biotechnology
5.4%
Automobiles
5.6%
Entertainment
5.8%
Pharmaceuticals
6.5%
Financial Services
8.7%
Software
10.7%
Broadline Retail
13.3%
Interactive Media & Services
15.6%
Footnote Description
Footnote*
 Net of other assets less liabilities

Country Weightings

Group By Country Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
7.1%
Canada
4.4%
Netherlands
5.2%
China
7.8%
Brazil
8.7%
United States
66.7%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

MercadoLibre, Inc.
7.1%
Meta Platforms, Inc., Class A
7.1%
Netflix, Inc.
5.8%
Tesla, Inc.
5.6%
Amazon.com, Inc.
5.3%
Alphabet, Inc., Class A
4.7%
Shopify, Inc., Class A
4.4%
Oracle Corp.
4.1%
Visa, Inc., Class A
4.0%
Adyen NV
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000167849    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Global Growth Fund  
Class Name Class C  
Trading Symbol LSCGX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Global Growth Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class C
$100
1.95%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 100  
Expense Ratio, Percent 1.95%  
AssetsNet $ 128,359,774  
Holdings Count | Holding 45  
Advisory Fees Paid, Amount $ 319,085  
InvestmentCompanyPortfolioTurnover 2.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$128,359,774
  • # of Portfolio Holdings (including overnight repurchase agreements)45
  • Portfolio Turnover Rate2%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$319,085
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.4%
Short-Term Investments
0.3%
Semiconductors & Semiconductor Equipment
3.6%
Aerospace & Defense
3.8%
Hotels, Restaurants & Leisure
3.9%
IT Services
4.4%
Biotechnology
5.4%
Automobiles
5.6%
Entertainment
5.8%
Pharmaceuticals
6.5%
Financial Services
8.7%
Software
10.7%
Broadline Retail
13.3%
Interactive Media & Services
15.6%
Footnote Description
Footnote*
 Net of other assets less liabilities

Country Weightings

Group By Country Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
7.1%
Canada
4.4%
Netherlands
5.2%
China
7.8%
Brazil
8.7%
United States
66.7%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

MercadoLibre, Inc.
7.1%
Meta Platforms, Inc., Class A
7.1%
Netflix, Inc.
5.8%
Tesla, Inc.
5.6%
Amazon.com, Inc.
5.3%
Alphabet, Inc., Class A
4.7%
Shopify, Inc., Class A
4.4%
Oracle Corp.
4.1%
Visa, Inc., Class A
4.0%
Adyen NV
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000188122    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Global Growth Fund  
Class Name Class N  
Trading Symbol LSNGX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Global Growth Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class N
$46
0.90%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 46  
Expense Ratio, Percent 0.90%  
AssetsNet $ 128,359,774  
Holdings Count | Holding 45  
Advisory Fees Paid, Amount $ 319,085  
InvestmentCompanyPortfolioTurnover 2.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$128,359,774
  • # of Portfolio Holdings (including overnight repurchase agreements)45
  • Portfolio Turnover Rate2%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$319,085
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.4%
Short-Term Investments
0.3%
Semiconductors & Semiconductor Equipment
3.6%
Aerospace & Defense
3.8%
Hotels, Restaurants & Leisure
3.9%
IT Services
4.4%
Biotechnology
5.4%
Automobiles
5.6%
Entertainment
5.8%
Pharmaceuticals
6.5%
Financial Services
8.7%
Software
10.7%
Broadline Retail
13.3%
Interactive Media & Services
15.6%
Footnote Description
Footnote*
 Net of other assets less liabilities

Country Weightings

Group By Country Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
7.1%
Canada
4.4%
Netherlands
5.2%
China
7.8%
Brazil
8.7%
United States
66.7%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

MercadoLibre, Inc.
7.1%
Meta Platforms, Inc., Class A
7.1%
Netflix, Inc.
5.8%
Tesla, Inc.
5.6%
Amazon.com, Inc.
5.3%
Alphabet, Inc., Class A
4.7%
Shopify, Inc., Class A
4.4%
Oracle Corp.
4.1%
Visa, Inc., Class A
4.0%
Adyen NV
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000167850    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Global Growth Fund  
Class Name Class Y  
Trading Symbol LSGGX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Global Growth Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class Y
$49
0.95%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 49  
Expense Ratio, Percent 0.95%  
AssetsNet $ 128,359,774  
Holdings Count | Holding 45  
Advisory Fees Paid, Amount $ 319,085  
InvestmentCompanyPortfolioTurnover 2.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$128,359,774
  • # of Portfolio Holdings (including overnight repurchase agreements)45
  • Portfolio Turnover Rate2%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$319,085
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.4%
Short-Term Investments
0.3%
Semiconductors & Semiconductor Equipment
3.6%
Aerospace & Defense
3.8%
Hotels, Restaurants & Leisure
3.9%
IT Services
4.4%
Biotechnology
5.4%
Automobiles
5.6%
Entertainment
5.8%
Pharmaceuticals
6.5%
Financial Services
8.7%
Software
10.7%
Broadline Retail
13.3%
Interactive Media & Services
15.6%
Footnote Description
Footnote*
 Net of other assets less liabilities

Country Weightings

Group By Country Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
7.1%
Canada
4.4%
Netherlands
5.2%
China
7.8%
Brazil
8.7%
United States
66.7%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

MercadoLibre, Inc.
7.1%
Meta Platforms, Inc., Class A
7.1%
Netflix, Inc.
5.8%
Tesla, Inc.
5.6%
Amazon.com, Inc.
5.3%
Alphabet, Inc., Class A
4.7%
Shopify, Inc., Class A
4.4%
Oracle Corp.
4.1%
Visa, Inc., Class A
4.0%
Adyen NV
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000105118    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Senior Floating Rate and Fixed Income Fund  
Class Name Class A  
Trading Symbol LSFAX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Senior Floating Rate and Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class A
$50
0.99%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 50  
Expense Ratio, Percent 0.99%  
AssetsNet $ 629,533,739  
Holdings Count | Holding 257  
Advisory Fees Paid, Amount $ 2,087,106  
InvestmentCompanyPortfolioTurnover 53.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$629,533,739
  • # of Portfolio Holdings (including overnight repurchase agreements and derivatives)257
  • Portfolio Turnover Rate53%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,087,106
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
25.7%
Short-Term Investments
7.1%
Financial Other
3.0%
Industrial Other
3.0%
Transportation Services
3.0%
Brokerage
3.5%
Cable Satellite
4.1%
Building Materials
5.7%
Media Entertainment
5.7%
Healthcare
5.7%
Property & Casualty Insurance
6.2%
Retailers
6.3%
Consumer Cyclical Services
7.8%
Technology
13.2%
Footnote Description
Footnote*
 Net of other assets less liabilities (including futures contracts)

Credit QualityFootnote Reference† 

Group By Country Chart
Value
Value
Cash & equivalents
4.3
Not ratedFootnote Reference^
1.4
CCC
8.3
B
64.7
BB
20.7
BBB
0.6
Footnote Description
Footnote†
 Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Footnote^
 Not Rated category represents only those securities not rated by S&P Global Ratings. Such securities may be rated by other NRSROs not shown here.
  
Credit Quality Explanation [Text Block] Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000105119    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Senior Floating Rate and Fixed Income Fund  
Class Name Class C  
Trading Symbol LSFCX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Senior Floating Rate and Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class C
$88
1.74%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 88  
Expense Ratio, Percent 1.74%  
AssetsNet $ 629,533,739  
Holdings Count | Holding 257  
Advisory Fees Paid, Amount $ 2,087,106  
InvestmentCompanyPortfolioTurnover 53.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$629,533,739
  • # of Portfolio Holdings (including overnight repurchase agreements and derivatives)257
  • Portfolio Turnover Rate53%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,087,106
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
25.7%
Short-Term Investments
7.1%
Financial Other
3.0%
Industrial Other
3.0%
Transportation Services
3.0%
Brokerage
3.5%
Cable Satellite
4.1%
Building Materials
5.7%
Media Entertainment
5.7%
Healthcare
5.7%
Property & Casualty Insurance
6.2%
Retailers
6.3%
Consumer Cyclical Services
7.8%
Technology
13.2%
Footnote Description
Footnote*
 Net of other assets less liabilities (including futures contracts)

Credit QualityFootnote Reference† 

Group By Country Chart
Value
Value
Cash & equivalents
4.3
Not ratedFootnote Reference^
1.4
CCC
8.3
B
64.7
BB
20.7
BBB
0.6
Footnote Description
Footnote†
 Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Footnote^
 Not Rated category represents only those securities not rated by S&P Global Ratings. Such securities may be rated by other NRSROs not shown here.
  
Credit Quality Explanation [Text Block] Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000188118    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Senior Floating Rate and Fixed Income Fund  
Class Name Class N  
Trading Symbol LSFNX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Senior Floating Rate and Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class N
$35
0.69%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 35  
Expense Ratio, Percent 0.69%  
AssetsNet $ 629,533,739  
Holdings Count | Holding 257  
Advisory Fees Paid, Amount $ 2,087,106  
InvestmentCompanyPortfolioTurnover 53.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$629,533,739
  • # of Portfolio Holdings (including overnight repurchase agreements and derivatives)257
  • Portfolio Turnover Rate53%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,087,106
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
25.7%
Short-Term Investments
7.1%
Financial Other
3.0%
Industrial Other
3.0%
Transportation Services
3.0%
Brokerage
3.5%
Cable Satellite
4.1%
Building Materials
5.7%
Media Entertainment
5.7%
Healthcare
5.7%
Property & Casualty Insurance
6.2%
Retailers
6.3%
Consumer Cyclical Services
7.8%
Technology
13.2%
Footnote Description
Footnote*
 Net of other assets less liabilities (including futures contracts)

Credit QualityFootnote Reference† 

Group By Country Chart
Value
Value
Cash & equivalents
4.3
Not ratedFootnote Reference^
1.4
CCC
8.3
B
64.7
BB
20.7
BBB
0.6
Footnote Description
Footnote†
 Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Footnote^
 Not Rated category represents only those securities not rated by S&P Global Ratings. Such securities may be rated by other NRSROs not shown here.
  
Credit Quality Explanation [Text Block] Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000105120    
Shareholder Report [Line Items]    
Fund Name Loomis Sayles Senior Floating Rate and Fixed Income Fund  
Class Name Class Y  
Trading Symbol LSFYX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Loomis Sayles Senior Floating Rate and Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class Y
$37
0.74%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 37  
Expense Ratio, Percent 0.74%  
AssetsNet $ 629,533,739  
Holdings Count | Holding 257  
Advisory Fees Paid, Amount $ 2,087,106  
InvestmentCompanyPortfolioTurnover 53.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$629,533,739
  • # of Portfolio Holdings (including overnight repurchase agreements and derivatives)257
  • Portfolio Turnover Rate53%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,087,106
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
25.7%
Short-Term Investments
7.1%
Financial Other
3.0%
Industrial Other
3.0%
Transportation Services
3.0%
Brokerage
3.5%
Cable Satellite
4.1%
Building Materials
5.7%
Media Entertainment
5.7%
Healthcare
5.7%
Property & Casualty Insurance
6.2%
Retailers
6.3%
Consumer Cyclical Services
7.8%
Technology
13.2%
Footnote Description
Footnote*
 Net of other assets less liabilities (including futures contracts)

Credit QualityFootnote Reference† 

Group By Country Chart
Value
Value
Cash & equivalents
4.3
Not ratedFootnote Reference^
1.4
CCC
8.3
B
64.7
BB
20.7
BBB
0.6
Footnote Description
Footnote†
 Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.
Footnote^
 Not Rated category represents only those securities not rated by S&P Global Ratings. Such securities may be rated by other NRSROs not shown here.
  
Credit Quality Explanation [Text Block] Credit ratings are by S&P Global Ratings. A credit rating is an assessment provided by a nationally recognized statistical rating organization (NRSRO) of the creditworthiness of an issuer with respect to debt obligations except for those debt obligations that are only privately rated. Ratings are measured on a scale that generally ranges from AAA (highest) to D (lowest). The credit ratings shown relate to the creditworthiness of the issuers of the underlying securities in the Fund, and not to the Fund or its shares. Credit ratings are subject to change.  
Material Fund Change [Text Block]

Material Fund Changes 

There were no material fund changes during the period. 

  
C000115831    
Shareholder Report [Line Items]    
Fund Name Vaughan Nelson Select Fund  
Class Name Class A  
Trading Symbol VNSAX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vaughan Nelson Select Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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.  
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 <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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class A
$54
1.10%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 54  
Expense Ratio, Percent 1.10%  
Material Change Date   Jul. 01, 2025
AssetsNet $ 551,060,839  
Holdings Count | Holding 27  
Advisory Fees Paid, Amount $ 2,255,971  
InvestmentCompanyPortfolioTurnover 44.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$551,060,839
  • # of Portfolio Holdings (including overnight repurchase agreements)27
  • Portfolio Turnover Rate44%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,255,971
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.7%
Short-Term Investments
1.7%
Specialty Retail
3.1%
Capital Markets
3.1%
Electrical Equipment
3.2%
Trading Companies & Distributors
3.2%
Chemicals
3.5%
Food Products
3.7%
Pharmaceuticals
3.8%
Banks
4.2%
Oil, Gas & Consumable Fuels
4.6%
Financial Services
4.6%
Broadline Retail
6.4%
Entertainment
6.5%
Interactive Media & Services
9.9%
Software
11.6%
Semiconductors & Semiconductor Equipment
14.2%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

Microsoft Corp.
7.6%
Amazon.com, Inc.
6.4%
NVIDIA Corp.
6.1%
Meta Platforms, Inc., Class A
5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.2%
Alphabet, Inc., Class A
4.7%
Berkshire Hathaway, Inc., Class B
4.6%
JPMorgan Chase & Co.
4.2%
Spotify Technology SA
4.1%
ServiceNow, Inc.
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

Effective July 1, 2025, 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: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Material Fund Change Expenses [Text Block]

Fees: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Summary of Change Legend [Text Block]

Effective July 1, 2025, 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.

  
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>  
C000115832    
Shareholder Report [Line Items]    
Fund Name Vaughan Nelson Select Fund  
Class Name Class C  
Trading Symbol VNSCX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vaughan Nelson Select Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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.  
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 <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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class C
$90
1.85%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 90  
Expense Ratio, Percent 1.85%  
Material Change Date   Jul. 01, 2025
AssetsNet $ 551,060,839  
Holdings Count | Holding 27  
Advisory Fees Paid, Amount $ 2,255,971  
InvestmentCompanyPortfolioTurnover 44.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$551,060,839
  • # of Portfolio Holdings (including overnight repurchase agreements)27
  • Portfolio Turnover Rate44%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,255,971
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.7%
Short-Term Investments
1.7%
Specialty Retail
3.1%
Capital Markets
3.1%
Electrical Equipment
3.2%
Trading Companies & Distributors
3.2%
Chemicals
3.5%
Food Products
3.7%
Pharmaceuticals
3.8%
Banks
4.2%
Oil, Gas & Consumable Fuels
4.6%
Financial Services
4.6%
Broadline Retail
6.4%
Entertainment
6.5%
Interactive Media & Services
9.9%
Software
11.6%
Semiconductors & Semiconductor Equipment
14.2%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

Microsoft Corp.
7.6%
Amazon.com, Inc.
6.4%
NVIDIA Corp.
6.1%
Meta Platforms, Inc., Class A
5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.2%
Alphabet, Inc., Class A
4.7%
Berkshire Hathaway, Inc., Class B
4.6%
JPMorgan Chase & Co.
4.2%
Spotify Technology SA
4.1%
ServiceNow, Inc.
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

Effective July 1, 2025, 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: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Material Fund Change Expenses [Text Block]

Fees: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Summary of Change Legend [Text Block]

Effective July 1, 2025, 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.

  
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>  
C000188120    
Shareholder Report [Line Items]    
Fund Name Vaughan Nelson Select Fund  
Class Name Class N  
Trading Symbol VNSNX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vaughan Nelson Select Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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.  
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 <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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class N
$36
0.73%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 36  
Expense Ratio, Percent 0.73%  
Material Change Date   Jul. 01, 2025
AssetsNet $ 551,060,839  
Holdings Count | Holding 27  
Advisory Fees Paid, Amount $ 2,255,971  
InvestmentCompanyPortfolioTurnover 44.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$551,060,839
  • # of Portfolio Holdings (including overnight repurchase agreements)27
  • Portfolio Turnover Rate44%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,255,971
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.7%
Short-Term Investments
1.7%
Specialty Retail
3.1%
Capital Markets
3.1%
Electrical Equipment
3.2%
Trading Companies & Distributors
3.2%
Chemicals
3.5%
Food Products
3.7%
Pharmaceuticals
3.8%
Banks
4.2%
Oil, Gas & Consumable Fuels
4.6%
Financial Services
4.6%
Broadline Retail
6.4%
Entertainment
6.5%
Interactive Media & Services
9.9%
Software
11.6%
Semiconductors & Semiconductor Equipment
14.2%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

Microsoft Corp.
7.6%
Amazon.com, Inc.
6.4%
NVIDIA Corp.
6.1%
Meta Platforms, Inc., Class A
5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.2%
Alphabet, Inc., Class A
4.7%
Berkshire Hathaway, Inc., Class B
4.6%
JPMorgan Chase & Co.
4.2%
Spotify Technology SA
4.1%
ServiceNow, Inc.
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

Effective July 1, 2025, 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: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Material Fund Change Expenses [Text Block]

Fees: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Summary of Change Legend [Text Block]

Effective July 1, 2025, 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.

  
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>  
C000115833    
Shareholder Report [Line Items]    
Fund Name Vaughan Nelson Select Fund  
Class Name Class Y  
Trading Symbol VNSYX  
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vaughan Nelson Select Fund for the period of December 1, 2024 to May 31, 2025.  
Shareholder Report Annual or Semi-Annual Semi-annual Shareholder Report  
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.  
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 <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)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference†
Class Y
$41
0.85%
Footnote Description
Footnote†
 Annualized for periods less than one year (if applicable).
  
Expenses Paid, Amount $ 41  
Expense Ratio, Percent 0.85%  
Material Change Date   Jul. 01, 2025
AssetsNet $ 551,060,839  
Holdings Count | Holding 27  
Advisory Fees Paid, Amount $ 2,255,971  
InvestmentCompanyPortfolioTurnover 44.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Total Net Assets$551,060,839
  • # of Portfolio Holdings (including overnight repurchase agreements)27
  • Portfolio Turnover Rate44%
  • Total Advisory Fees Paid (after waiver/reimbursement, if applicable)$2,255,971
  
Holdings [Text Block]

Industry Summary

Group By Sector Chart
Value
Value
Other investments less than 3% of net assetsFootnote Reference*
12.7%
Short-Term Investments
1.7%
Specialty Retail
3.1%
Capital Markets
3.1%
Electrical Equipment
3.2%
Trading Companies & Distributors
3.2%
Chemicals
3.5%
Food Products
3.7%
Pharmaceuticals
3.8%
Banks
4.2%
Oil, Gas & Consumable Fuels
4.6%
Financial Services
4.6%
Broadline Retail
6.4%
Entertainment
6.5%
Interactive Media & Services
9.9%
Software
11.6%
Semiconductors & Semiconductor Equipment
14.2%
Footnote Description
Footnote*
 Net of other assets less liabilities
  
Largest Holdings [Text Block]

Top Ten Holdings

Microsoft Corp.
7.6%
Amazon.com, Inc.
6.4%
NVIDIA Corp.
6.1%
Meta Platforms, Inc., Class A
5.2%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.2%
Alphabet, Inc., Class A
4.7%
Berkshire Hathaway, Inc., Class B
4.6%
JPMorgan Chase & Co.
4.2%
Spotify Technology SA
4.1%
ServiceNow, Inc.
4.0%
  
Material Fund Change [Text Block]

Material Fund Changes 

Effective July 1, 2025, 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: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Material Fund Change Expenses [Text Block]

Fees: The advisory fee rate was reduced from 0.70% to 0.66% and the sub-advisory fee rate was reduced from 0.47% to 0.4425%.

  
Summary of Change Legend [Text Block]

Effective July 1, 2025, 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.

  
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>