497

Natixis Funds Trust II

Exhibit Index

Exhibits for Item 28 of Form N-1A

Exhibit	Exhibit Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

12 Months Ended

May. 01, 2015

ASG TACTICAL U.S. MARKET FUND

MCDONNELL INTERMEDIATE MUNICIPAL BOND FUND

Supplement dated July 1, 2015 to the Prospectuses of ASG Tactical U.S. Market Fund and McDonnell

Intermediate Municipal Bond Fund (the “Funds”), each dated May 1, 2015 as may be revised and

supplemented from time to time.

ASG Tactical U.S. Market Fund

Effective July 1, 2015, AlphaSimplex Group, 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, 2017.

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		0.80	%		0.80	%		0.80	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%		0.00	%
Other expenses1,2		0.50	%		0.51	%		0.51	%
Total annual fund operating expenses		1.55	%		2.31	%		1.31	%
Fee waiver and/or expense reimbursement3		0.29	%		0.30	%		0.30	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.26	%		2.01	%		1.01	%

1 Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

2 The expense information shown in the table above includes acquired fund fees and expenses of less than 0.01%; the ratios 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.

3 AlphaSimplex Group, LLC (“AlphaSimplex” 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, 2017 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, Class C and Class 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	$	696	$	986	$	1,323	$	2,271
Class C	$	304	$	668	$	1,184	$	2,602
Class Y	$	103	$	360	$	664	$	1,530

If shares are not redeemed:
	1 year		3 years		5 years		10 years
Class C	$	204	$	668	$	1,184	$	2,602

McDonnell Intermediate Municipal Bond Fund

Effective July 1, 2015, 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 0.70%, 1.45%, and 0.45% 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, 2017.

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		0.40	%		0.40	%		0.40	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%		0.00	%
Other expenses1		0.58	%		0.61	%		0.59	%
Total annual fund operating expenses		1.23	%		2.01	%		0.99	%
Fee waiver and/or expense reimbursement2		0.53	%		0.56	%		0.54	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		0.70	%		1.45	%		0.45	%

1 Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

2 The Fund’s investment adviser has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 0.70%, 1.45%, and 0.45% 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, 2017 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, Class C and Class 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 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	$	419	$	632	$	910	$	1,702
Class C	$	248	$	529	$	986	$	2,253
Class Y	$	46	$	214	$	448	$	1,121

If shares are not redeemed:
	1 year		3 years		5 years		10 years
Class C	$	148	$	529	$	986	$	2,253

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

Natixis Funds Trust II

Prospectus Date

rr_ProspectusDate

May 01, 2015

Supplement [Text Block]

nftii_SupplementTextBlock

ASG TACTICAL U.S. MARKET FUND

MCDONNELL INTERMEDIATE MUNICIPAL BOND FUND

Supplement dated July 1, 2015 to the Prospectuses of ASG Tactical U.S. Market Fund and McDonnell

Intermediate Municipal Bond Fund (the “Funds”), each dated May 1, 2015 as may be revised and

supplemented from time to time.

ASG Tactical U.S. Market Fund

Effective July 1, 2015, AlphaSimplex Group, 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, 2017.

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		0.80	%		0.80	%		0.80	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%		0.00	%
Other expenses1,2		0.50	%		0.51	%		0.51	%
Total annual fund operating expenses		1.55	%		2.31	%		1.31	%
Fee waiver and/or expense reimbursement3		0.29	%		0.30	%		0.30	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.26	%		2.01	%		1.01	%

1 Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

2 The expense information shown in the table above includes acquired fund fees and expenses of less than 0.01%; the ratios 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.

3 AlphaSimplex Group, LLC (“AlphaSimplex” 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, 2017 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, Class C and Class 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	$	696	$	986	$	1,323	$	2,271
Class C	$	304	$	668	$	1,184	$	2,602
Class Y	$	103	$	360	$	664	$	1,530

If shares are not redeemed:
	1 year		3 years		5 years		10 years
Class C	$	204	$	668	$	1,184	$	2,602

McDonnell Intermediate Municipal Bond Fund

Effective July 1, 2015, 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 0.70%, 1.45%, and 0.45% 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, 2017.

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		0.40	%		0.40	%		0.40	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%		0.00	%
Other expenses1		0.58	%		0.61	%		0.59	%
Total annual fund operating expenses		1.23	%		2.01	%		0.99	%
Fee waiver and/or expense reimbursement2		0.53	%		0.56	%		0.54	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		0.70	%		1.45	%		0.45	%

1 Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

2 The Fund’s investment adviser has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 0.70%, 1.45%, and 0.45% 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, 2017 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, Class C and Class 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 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	$	419	$	632	$	910	$	1,702
Class C	$	248	$	529	$	986	$	2,253
Class Y	$	46	$	214	$	448	$	1,121

If shares are not redeemed:
	1 year		3 years		5 years		10 years
Class C	$	148	$	529	$	986	$	2,253

ASG Tactical U.S. Market Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

nftii_SupplementTextBlock

ASG TACTICAL U.S. MARKET FUND

Supplement dated July 1, 2015 to the Prospectuses of ASG Tactical U.S. Market Fund and McDonnell

Intermediate Municipal Bond Fund (the “Funds”), each dated May 1, 2015 as may be revised and

supplemented from time to time.

ASG Tactical U.S. Market Fund

Effective July 1, 2015, AlphaSimplex Group, 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, 2017.

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		0.80	%		0.80	%		0.80	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%		0.00	%
Other expenses1,2		0.50	%		0.51	%		0.51	%
Total annual fund operating expenses		1.55	%		2.31	%		1.31	%
Fee waiver and/or expense reimbursement3		0.29	%		0.30	%		0.30	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.26	%		2.01	%		1.01	%

1 Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

2 The expense information shown in the table above includes acquired fund fees and expenses of less than 0.01%; the ratios 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.

3 AlphaSimplex Group, LLC (“AlphaSimplex” 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, 2017 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, Class C and Class 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	$	696	$	986	$	1,323	$	2,271
Class C	$	304	$	668	$	1,184	$	2,602
Class Y	$	103	$	360	$	664	$	1,530

If shares are not redeemed:
	1 year		3 years		5 years		10 years
Class C	$	204	$	668	$	1,184	$	2,602

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2017

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

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

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The expense information shown in the table above includes acquired fund fees and expenses of less than 0.01%; the ratios 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.

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:

ASG Tactical U.S. Market Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.80%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

^[1],[2]

rr_OtherExpensesOverAssets

0.50%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.55%

Fee waiver and/or expense reimbursement

^[3]

rr_FeeWaiverOrReimbursementOverAssets

0.29%

Total annual fund operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

1.26%

1 year

rr_ExpenseExampleYear01

$ 696

3 years

rr_ExpenseExampleYear03

986

5 years

rr_ExpenseExampleYear05

1,323

10 years

rr_ExpenseExampleYear10

$ 2,271

ASG Tactical U.S. Market Fund | Class C

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.80%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

^[1],[2]

rr_OtherExpensesOverAssets

0.51%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.31%

Fee waiver and/or expense reimbursement

^[3]

rr_FeeWaiverOrReimbursementOverAssets

0.30%

Total annual fund operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

2.01%

1 year

rr_ExpenseExampleYear01

$ 304

3 years

rr_ExpenseExampleYear03

668

5 years

rr_ExpenseExampleYear05

1,184

10 years

rr_ExpenseExampleYear10

2,602

1 year

rr_ExpenseExampleNoRedemptionYear01

204

3 years

rr_ExpenseExampleNoRedemptionYear03

668

5 years

rr_ExpenseExampleNoRedemptionYear05

1,184

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 2,602

ASG Tactical U.S. Market Fund | Class Y

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.80%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

^[1],[2]

rr_OtherExpensesOverAssets

0.51%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.31%

Fee waiver and/or expense reimbursement

^[3]

rr_FeeWaiverOrReimbursementOverAssets

0.30%

Total annual fund operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

1.01%

1 year

rr_ExpenseExampleYear01

$ 103

3 years

rr_ExpenseExampleYear03

360

5 years

rr_ExpenseExampleYear05

664

10 years

rr_ExpenseExampleYear10

$ 1,530

McDonnell Intermediate Municipal Bond Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

nftii_SupplementTextBlock

MCDONNELL INTERMEDIATE MUNICIPAL BOND FUND

Supplement dated July 1, 2015 to the Prospectuses of ASG Tactical U.S. Market Fund and McDonnell

Intermediate Municipal Bond Fund (the “Funds”), each dated May 1, 2015 as may be revised and

supplemented from time to time.

McDonnell Intermediate Municipal Bond Fund

Effective July 1, 2015, 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 0.70%, 1.45%, and 0.45% 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, 2017.

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		0.40	%		0.40	%		0.40	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%		0.00	%
Other expenses1		0.58	%		0.61	%		0.59	%
Total annual fund operating expenses		1.23	%		2.01	%		0.99	%
Fee waiver and/or expense reimbursement2		0.53	%		0.56	%		0.54	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		0.70	%		1.45	%		0.45	%

1 Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

2 The Fund’s investment adviser has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 0.70%, 1.45%, and 0.45% 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, 2017 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, Class C and Class 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 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	$	419	$	632	$	910	$	1,702
Class C	$	248	$	529	$	986	$	2,253
Class Y	$	46	$	214	$	448	$	1,121

If shares are not redeemed:
	1 year		3 years		5 years		10 years
Class C	$	148	$	529	$	986	$	2,253

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2017

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

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:

McDonnell Intermediate Municipal Bond Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.40%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

^[1]

rr_OtherExpensesOverAssets

0.58%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.23%

Fee waiver and/or expense reimbursement

^[4]

rr_FeeWaiverOrReimbursementOverAssets

0.53%

Total annual fund operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

0.70%

1 year

rr_ExpenseExampleYear01

$ 419

3 years

rr_ExpenseExampleYear03

632

5 years

rr_ExpenseExampleYear05

910

10 years

rr_ExpenseExampleYear10

$ 1,702

McDonnell Intermediate Municipal Bond Fund | Class C

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.40%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

^[1]

rr_OtherExpensesOverAssets

0.61%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.01%

Fee waiver and/or expense reimbursement

^[4]

rr_FeeWaiverOrReimbursementOverAssets

0.56%

Total annual fund operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

1.45%

1 year

rr_ExpenseExampleYear01

$ 248

3 years

rr_ExpenseExampleYear03

529

5 years

rr_ExpenseExampleYear05

986

10 years

rr_ExpenseExampleYear10

2,253

1 year

rr_ExpenseExampleNoRedemptionYear01

148

3 years

rr_ExpenseExampleNoRedemptionYear03

529

5 years

rr_ExpenseExampleNoRedemptionYear05

986

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 2,253

McDonnell Intermediate Municipal Bond Fund | Class Y

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.40%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

^[1]

rr_OtherExpensesOverAssets

0.59%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.99%

Fee waiver and/or expense reimbursement

^[4]

rr_FeeWaiverOrReimbursementOverAssets

0.54%

Total annual fund operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

0.45%

1 year

rr_ExpenseExampleYear01

$ 46

3 years

rr_ExpenseExampleYear03

214

5 years

rr_ExpenseExampleYear05

448

10 years

rr_ExpenseExampleYear10

$ 1,121

[1] Other expenses have been restated to reflect current custodian and transfer agency fees for the Fund effective October 1, 2014.

[2] The expense information shown in the table above includes acquired fund fees and expenses of less than 0.01%; the ratios 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.

[3] AlphaSimplex Group, LLC (“AlphaSimplex” 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, 2017 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, Class C and Class 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.

[4] The Fund’s investment adviser has given a binding contractual undertaking to the Fund to limit the amount of the Fund’s total annual fund operating expenses to 0.70%, 1.45%, and 0.45% 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, 2017 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, Class C and Class 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.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 31, 2014
Registrant Name	dei_EntityRegistrantName	Natixis Funds Trust II
Central Index Key	dei_EntityCentralIndexKey	0000052136
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jul. 01, 2015
Document Effective Date	dei_DocumentEffectiveDate	Jul. 01, 2015
Prospectus Date	rr_ProspectusDate	May 01, 2015

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Natixis Funds Trust II
Prospectus Date	rr_ProspectusDate	May 01, 2015
Document Creation Date	dei_DocumentCreationDate	Jul. 01, 2015