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Prospectus: rr_ProspectusTable  
Supplement Text Block natfdstrtii-20160630_SupplementTextBlock
 
NATIXIS FUNDS
Supplement dated June 30, 2016 to the Natixis Funds Summary Prospectuses and Statutory Prospectuses, dated April 1, 2016 and May 1, 2016 as may be revised or supplemented from time to time, for the following funds.
LOOMIS SAYLES DIVIDEND INCOME FUND
Effective July 1, 2016, Loomis, Sayles & Company, L.P. has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses (exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses) to 1.10%, 1.85% and 0.85% of the Fund's average daily net assets for Class A, Class C and Class Y shares, respectively.
This undertaking is in effect through March 31, 2018.
Accordingly, the Annual Fund Operating Expenses table and the Example table within the section "Fund Fees & Expenses" are amended and restated as follows with respect to the Fund:
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
 
                       
 
Class A
 
 
Class C
 
 
Class Y
 
Management fees
 
0.60
 
 
0.60
 
 
0.60
Distribution and/or service (12b-1) fees
 
0.25
 
 
1.00
 
 
0.00
Other expenses
 
0.75
 
 
0.75
 
 
0.72
Total annual fund operating expenses
 
1.60
 
 
2.35
 
 
1.32
Fee waiver and/or expense reimbursement1
 
0.50
 
 
0.50
 
 
0.47
Total annual fund operating expenses after fee waiver and/or expense reimbursement
 
1.10
 
 
1.85
 
 
0.85
 
1
Loomis, Sayles & Company, L.P. ("Loomis Sayles" or the "Adviser") has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses to 1.10%, 1.85% and 0.85% of the Fund's average daily net assets for Class A, C and Y shares, respectively, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through March 31, 2018 and may be terminated before then only with the consent of the Fund's Board of Trustees. The Adviser will be permitted to recover, on a class by class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below the applicable expense limitations for Class A, C and Y shares. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fees or expenses were waived/reimbursed.
Example
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 Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement for the first 21 months and on the Total Annual Fund Operating Expenses for the remaining periods. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
 
                                 
If shares are redeemed:
 
 
  
1 year
 
  
3 years
 
  
5 years
 
  
10 years
 
Class A
  
$
681
  
  
$
969
  
  
$
1,316
  
  
$
2,295
  
Class C
  
$
288
  
  
$
648
  
  
$
1,174
  
  
$
2,618
  
Class Y
  
$
87
  
  
$
335
  
  
$
643
  
  
$
1,517
  
 
                                 
If shares are not redeemed:
 
 
  
1 year
 
  
3 years
 
  
5 years
 
  
10 years
 
Class C
  
$
188
  
  
$
648
  
  
$
1,174
  
  
$
2,618
  
 
 

 
VAUGHAN NELSON SELECT FUND
Effective July 1, 2016, NGAM Advisors, L.P. has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses (exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses) to 1.30%, 2.05% and 1.05% of the Fund's average daily net assets for Class A, Class C and Class Y shares, respectively.
This undertaking is in effect through March 31, 2018.
Accordingly, the Annual Fund Operating Expenses table and the Example table within the section "Fund Fees & Expenses" are amended and restated as follows with respect to the Fund:
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
 
                       
 
Class A
 
 
Class C
 
 
Class Y
 
Management fees
 
0.85
 
 
0.85
 
 
0.85
Distribution and/or service (12b-1) fees
 
0.25
 
 
1.00
 
 
0.00
Other expenses
 
0.30
 
 
0.30
 
 
0.30
Acquired fund fees and expenses1,2
 
0.14
 
 
0.14
 
 
0.14
Total annual fund operating expenses
 
1.54
 
 
2.29
 
 
1.29
Fee waiver and/or expense reimbursement
 
0.10
 
 
0.10
 
 
0.10
Total annual fund operating expenses after the fee waiver and/or expense reimbursement
 
1.44
 
 
2.19
 
 
1.19
 
1
The expense information shown in the table above may 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.
2
NGAM Advisors, L.P. ("NGAM Advisors") has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses to 1.30%, 2.05% and 1.05% of the Fund's average daily net assets for Class A, C and Y shares, respectively, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, dividend expenses on securities sold short, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through March 31, 2018 and may be terminated before then only with the consent of the Fund's Board of Trustees. The Fund's investment adviser will be permitted to recover, on a class by class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below the applicable expense limitations for Class A, C and Y shares. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fees or expenses were waived/reimbursed.
Example
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 Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement for the first 21 months and on the Total Annual Fund Operating Expenses for the remaining periods. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
 
                                 
If shares are redeemed:
 
 
  
1 year
 
  
3 years
 
  
5 years
 
  
10 years
 
Class A
  
$
713
  
  
$
1,017
  
  
$
1,350
  
  
$
2,290
  
Class C
  
$
322
  
  
$
698
  
  
$
1,209
  
  
$
2,612
  
Class Y
  
$
121
  
  
$
391
  
  
$
691
  
  
$
1,541
  
 
                                 
If shares are not redeemed:
 
 
  
1 year
 
  
3 years
 
  
5 years
 
  
10 years
 
Class C
  
$
222
  
  
$
698
  
  
$
1,209
  
  
$
2,612
  
 
 

 
SEEYONDSM MULTI-ASSET ALLOCATION FUND
Effective July 1, 2016, Natixis Asset Management U.S., LLC has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses (exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses) to 1.25%, 2.00%, and 1.00% of the Fund's average daily net assets for Class A, Class C and Class Y shares, respectively.
This undertaking is in effect through April 30, 2018.
Additionally, effective July 1, 2016, Natixis Asset Management U.S., LLC has reduced the advisory fee for the Fund.
Accordingly, the Annual Fund Operating Expenses table and the Example table within the section "Fund Fees & Expenses" are amended and restated as follows with respect to the Fund:
Annual Fund Operating Expenses1
(expenses that you pay each year as a percentage of the value of your investment)
 
                         
 
  
Class A
 
 
Class C
 
 
Class Y
 
Management fees
  
 
0.80
 
 
0.80
 
 
0.80
Distribution and/or service (12b-1) fees
  
 
0.25
 
 
1.00
 
 
0.00
Other expenses
  
 
0.50
 
 
0.48
 
 
0.44
Acquired fund fees and expenses2
  
 
0.05
 
 
0.05
 
 
0.05
Total annual fund operating expenses
  
 
1.60
 
 
2.33
 
 
1.29
Fee waiver and/or expense reimbursement3
  
 
0.25
 
 
0.23
 
 
0.20
Total annual fund operating expenses after fee waiver and/or expense reimbursement
  
 
1.35
 
 
2.10
 
 
1.09
 
1
The Fund's operating expenses have been restated to reflect a reduction in management fees, effective as of July 1, 2016, as if such reduction had been in effect during the fiscal year ended December 31, 2015. The information has been restated to better reflect anticipated expenses of the Fund.
2
The expense information shown in the table differs 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.
3
Natixis Asset Management U.S., LLC ("Natixis AM US" or the "Adviser") has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses to 1.25%, 2.00% and 1.00% of the Fund's average daily net assets for Class A, Class C and Class Y shares, respectively, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through April 30, 2018 and may be terminated before then only with the consent of the Fund's Board of Trustees. The Adviser will be permitted to recover, on a class-by-class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below the applicable expense limitations for Class A, C and Y shares. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fee/expense was waived/reimbursed.
Example
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 for the first 22 months and on the Total Annual Fund Operating Expenses for the remaining periods. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
 
                                 
If shares are redeemed:
 
 
  
1 year
 
  
3 years
 
  
5 years
 
  
10 years
 
Class A
  
$
705
  
  
$
1,008
  
  
$
1,354
  
  
$
2,329
  
Class C
  
$
313
  
  
$
686
  
  
$
1,206
  
  
$
2,633
  
Class Y
  
$
111
  
  
$
372
  
  
$
672
  
  
$
1,524
  
 
                                 
If shares are not redeemed:
 
 
  
1 year
 
  
3 years
 
  
5 years
 
  
10 years
 
Class C
  
$
213
  
  
$
686
  
  
$
1,206
  
  
$
2,633
  
 
(Natixis Funds Trust II) | (Loomis Sayles Dividend Income Fund)  
Prospectus: rr_ProspectusTable  
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, 2018
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 Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement for the first 21 months and on the Total Annual Fund Operating Expenses for the remaining periods. 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:

(Natixis Funds Trust II) | (Loomis Sayles Dividend Income Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.75%
Total annual fund operating expenses rr_ExpensesOverAssets 1.60%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.50% [1]
Net Expenses Over Assets rr_NetExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 681
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 969
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,316
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,295
(Natixis Funds Trust II) | (Loomis Sayles Dividend Income Fund) | Class C  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.75%
Total annual fund operating expenses rr_ExpensesOverAssets 2.35%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.50% [1]
Net Expenses Over Assets rr_NetExpensesOverAssets 1.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 288
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 648
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,174
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,618
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 188
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 648
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,174
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,618
(Natixis Funds Trust II) | (Loomis Sayles Dividend Income Fund) | Class Y  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.72%
Total annual fund operating expenses rr_ExpensesOverAssets 1.32%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.47% [1]
Net Expenses Over Assets rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 335
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 643
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,517
(Natixis Funds Trust II) | (Vaughan Nelson Select Fund)  
Prospectus: rr_ProspectusTable  
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, 2018
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 Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement for the first 21 months and on the Total Annual Fund Operating Expenses for the remaining periods. 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:

(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.85%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.30%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.14% [2],[3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.54%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.10%
Net Expenses Over Assets rr_NetExpensesOverAssets 1.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 713
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,017
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,350
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,290
(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class C  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.85%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.30%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.14% [2],[3]
Total annual fund operating expenses rr_ExpensesOverAssets 2.29%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.10%
Net Expenses Over Assets rr_NetExpensesOverAssets 2.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 322
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 698
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,209
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,612
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 222
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 698
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,209
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,612
(Natixis Funds Trust II) | (Vaughan Nelson Select Fund) | Class Y  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.85%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.30%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.14% [2],[3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.29%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.10%
Net Expenses Over Assets rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 391
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 691
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,541
(Natixis Funds Trust II) | (Seeyond℠ Multi-Asset Allocation Fund)  
Prospectus: rr_ProspectusTable  
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)

[4]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 31, 2018
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 for the first 22 months and on the Total Annual Fund Operating Expenses for the remaining periods. 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:

(Natixis Funds Trust II) | (Seeyond℠ Multi-Asset Allocation Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.50%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 1.60%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.25% [6]
Net Expenses Over Assets rr_NetExpensesOverAssets 1.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 705
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,008
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,354
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,329
(Natixis Funds Trust II) | (Seeyond℠ Multi-Asset Allocation Fund) | Class C  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.48%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 2.33%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.23% [6]
Net Expenses Over Assets rr_NetExpensesOverAssets 2.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 313
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 686
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,206
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,633
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 213
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 686
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,206
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,633
(Natixis Funds Trust II) | (Seeyond℠ Multi-Asset Allocation Fund) | Class Y  
Prospectus: rr_ProspectusTable  
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.44%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 1.29%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.20% [6]
Net Expenses Over Assets rr_NetExpensesOverAssets 1.09%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 372
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 672
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,524
[1] Loomis, Sayles & Company, L.P. ("Loomis Sayles" or the "Adviser") has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses to 1.10%, 1.85% and 0.85% of the Fund's average daily net assets for Class A, C and Y shares, respectively, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through March 31, 2018 and may be terminated before then only with the consent of the Fund's Board of Trustees. The Adviser will be permitted to recover, on a class by class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below the applicable expense limitations for Class A, C and Y shares. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fees or expenses were waived/reimbursed.
[2] NGAM Advisors, L.P. ("NGAM Advisors") has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses to 1.30%, 2.05% and 1.05% of the Fund's average daily net assets for Class A, C and Y shares, respectively, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, dividend expenses on securities sold short, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through March 31, 2018 and may be terminated before then only with the consent of the Fund's Board of Trustees. The Fund's investment adviser will be permitted to recover, on a class by class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below the applicable expense limitations for Class A, C and Y shares. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fees or expenses were waived/reimbursed.
[3] The expense information shown in the table above may 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.
[4] The Fund's operating expenses have been restated to reflect a reduction in management fees, effective as of July 1, 2016, as if such reduction had been in effect during the fiscal year ended December 31, 2015. The information has been restated to better reflect anticipated expenses of the Fund.
[5] The expense information shown in the table differs 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.
[6] Natixis Asset Management U.S., LLC ("Natixis AM US" or the "Adviser") has given a binding contractual undertaking to the Fund to limit the amount of the Fund's total annual fund operating expenses to 1.25%, 2.00% and 1.00% of the Fund's average daily net assets for Class A, Class C and Class Y shares, respectively, exclusive of brokerage expenses, interest expense, taxes, acquired fund fees and expenses, organizational and extraordinary expenses, such as litigation and indemnification expenses. This undertaking is in effect through April 30, 2018 and may be terminated before then only with the consent of the Fund's Board of Trustees. The Adviser will be permitted to recover, on a class-by-class basis, management fees waived and/or expenses reimbursed to the extent that expenses in later periods fall below the applicable expense limitations for Class A, C and Y shares. The Fund will not be obligated to repay any such waived/reimbursed fees and expenses more than one year after the end of the fiscal year in which the fee/expense was waived/reimbursed.