Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

Natixis Funds Trust I

Prospectus Date

rr_ProspectusDate

May 01, 2011

Supplement [Text Block]

cik0000770540_SupplementTextBlock

 

NATIXIS FUNDS

Supplement dated June 24, 2011 to the Class A, Class C and Class Y Prospectuses, each dated May 1, 2011, as may be revised or supplemented from time to time for the following funds:

Absolute Asia Dynamic Equity Fund

Effective immediately, the Annual Fund Operating Expenses table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class AC Fund Summary is amended as follows:

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)	Class A			Class C
Management fees		1.00	%		1.00	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%
Other expenses (restated to reflect current expenses)		6.60	%		5.69	%
Total annual fund operating expenses		7.85	%		7.69	%
Fee waiver and/or expense reimbursement1		6.10	%		5.19	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.75	%		2.50	%

1 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 1.75% and 2.50% of the Fund's average daily net assets for Class A and C 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, 2012 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 1.75% and 2.50% of the Fund's average daily net assets for Class A and Class C shares, respectively. 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.

Effective immediately, the Example table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class AC Fund Summary is amended as follows:

	Class A		Class C
			If shares are redeemed		If shares are not redeemed
1 year	$	743	$	353	$	253
3 years	$	2,227	$	1,787	$	1,787
5 years	$	3,628	$	3,240	$	3,240
10 years	$	6,796	$	6,544	$	6,544

Effective immediately, the Annual Fund Operating Expenses table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class Y Fund Summary is amended as follows:

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)	Class Y
Management fees		1.00	%
Other expenses (restated to reflect current expenses)		6.10	%
Total annual fund operating expenses		7.10	%
Fee waiver and/or expense reimbursement1		5.60	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.50	%

1 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 1.50% of the Fund's average daily net assets for Class Y shares, 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, 2012 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 1.50% of the Fund's average daily net assets for 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.

Effective immediately, the Example table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class Y Fund Summary is amended as follows:

	Class Y
1 year	$	153
3 years	$	1,592
5 years	$	2,971
10 years	$	6,173

Retail Class | Absolute Asia Dynamic Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

cik0000770540_SupplementTextBlock

NATIXIS FUNDS

Supplement dated June 24, 2011 to the Class A, Class C and Class Y Prospectuses, each dated May 1, 2011, as may be revised or supplemented from time to time for the following funds:

Absolute Asia Dynamic Equity Fund 

Effective immediately, the Annual Fund Operating Expenses table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class AC Fund Summary is amended as follows:

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)	Class A			Class C
Management fees		1.00	%		1.00	%
Distribution and/or service (12b-1) fees		0.25	%		1.00	%
Other expenses (restated to reflect current expenses)		6.60	%		5.69	%
Total annual fund operating expenses		7.85	%		7.69	%
Fee waiver and/or expense reimbursement1		6.10	%		5.19	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.75	%		2.50	%

1 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 1.75% and 2.50% of the Fund's average daily net assets for Class A and C 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, 2012 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 1.75% and 2.50% of the Fund's average daily net assets for Class A and Class C shares, respectively. 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.

Effective immediately, the Example table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class AC Fund Summary is amended as follows:

	Class A		Class C
			If shares are redeemed		If shares are not redeemed
1 year	$	743	$	353	$	253
3 years	$	2,227	$	1,787	$	1,787
5 years	$	3,628	$	3,240	$	3,240
10 years	$	6,796	$	6,544	$	6,544

Class Y | Absolute Asia Dynamic Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

cik0000770540_SupplementTextBlock

Effective immediately, the Annual Fund Operating Expenses table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class Y Fund Summary is amended as follows:

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)	Class Y
Management fees		1.00	%
Other expenses (restated to reflect current expenses)		6.10	%
Total annual fund operating expenses		7.10	%
Fee waiver and/or expense reimbursement1		5.60	%
Total annual fund operating expenses after fee waiver and/or expense reimbursement		1.50	%

1 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 1.50% of the Fund's average daily net assets for Class Y shares, 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, 2012 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 1.50% of the Fund's average daily net assets for 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.

Effective immediately, the Example table under the section "Fund Fees & Expenses" in the Absolute Asia Dynamic Equity Fund Class Y Fund Summary is amended as follows:

	Class Y
1 year	$	153
3 years	$	1,592
5 years	$	2,971
10 years	$	6,173