Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Natixis Funds Trust I
Prospectus Date	rr_ProspectusDate	May 01, 2013
Hansberger International Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Hansberger International Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Goal
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	Fund Fees & Expenses
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Natixis Fund Complex. More information about these and other discounts is available from your financial professional and in the section “How Sales Charges Are Calculated” on page 78 of the Prospectus and on page 119 in the section “Reduced Sales Charges” of the Statement of Additional Information (“SAI”).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
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, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes for you if your Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During its most recently ended fiscal year, the Fund’s portfolio turnover rate was 119% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	119.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Natixis Fund Complex.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	The Fund’s fee waiver and/or expense reimbursement and total annual fund operating expenses after fee waiver and/or reimbursement have been restated to reflect current expense cap arrangements.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees	The expense information shown in the table 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 (expenses indirectly borne by the Fund through investments in certain pooled investment vehicles).
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 year and on the Total Annual Fund Operating Expenses for the remaining years. 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:
Strategy [Heading]	rr_StrategyHeading	Investments, Risks and Performance Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund seeks to attain its goal by normally investing substantially all of its assets in equity securities (including, but not limited to, common stock, preferred stock and convertible securities). The Fund is an international mutual fund, which means that it seeks to invest a significant portion of its net assets in equity securities of companies located outside the United States. The Fund invests in small-, mid-, and large-capitalization companies and expects to invest its assets across developed and emerging markets in Eastern and Western Europe, Asia and the Americas. The Fund’s portfolio typically holds approximately 40 to 60 stocks. Subject to the allocation policy adopted by the Board of Trustees, NGAM Advisors, L.P. (“NGAM Advisors”) generally allocates capital invested in the Fund equally between its two segments, each of which is managed by Hansberger Global Investors, Inc. (“Hansberger”) as described below. Under the allocation policy, NGAM Advisors monitors the relative size of the segments on a monthly basis and may allocate capital away or towards a segment from time to time. NGAM Advisors will generally reallocate capital away from or towards a segment in order to bring the segments back within the targeted allocation range. However, the target allocation may not always be met. Growth Segment: In managing this segment, Hansberger follows a flexible investment policy that allows it to select those investments it believes are best suited to achieve the Fund’s investment objective over the long-term, using a disciplined, long-term approach to international investing. The growth segment will primarily invest in the equity securities of companies organized or headquartered outside of the United States. This segment will invest in at least three different countries outside the United States and generally expects to be invested in more than three countries, including countries considered to be emerging market countries. In general, Hansberger seeks companies with the following characteristics, although not all of the companies selected will have these attributes: High secular growth Superior profitability Medium to large capitalizations, although there are no limitations on the size of the companies in which the segment may invest In making investment decisions, Hansberger generally employs the following methods: Securities are selected on the basis of fundamental company-by-company analysis. In choosing equity investments, Hansberger will typically focus on the market price of a company’s securities relative to its evaluation of the company’s long-term earnings and cash flow potential. In addition, a company’s valuation measures, including but not limited to price-to-earnings ratio and price-to-book ratio, will customarily be considered. Value Segment: In managing this segment, Hansberger employs an intensive fundamental approach to selecting stocks. Hansberger seeks to identify stocks with a market value that is believed to be less than a company’s intrinsic value, based on its long-term potential. Hansberger’s investment approach integrates extensive research (both internal and external), proprietary valuation screens, and fundamental analysis of stocks with a long-term investment perspective. This analysis involves evaluating a company’s prospects by focusing on such factors as the quality of a company’s management, the competitive position of a company within its industry, the financial strength of the company, the quality and growth potential of its earnings, and the outlook for the company’s future based on these and other similar factors. Hansberger will also consider other factors in its analysis, including country and political risks, economic and market conditions, the issuer’s structural company and industry specific factors, changes in shareholder orientation (for example, a shift from treating all shareholders fairly to disadvantaging minority shareholders), and the company’s management. Hansberger seeks to broaden the scope and increase the effectiveness of its fundamental analysis by searching for undervalued stocks in many countries around the world, including emerging markets. This global search provides Hansberger with more diverse opportunities and with the flexibility to shift portfolio investments, not only from company to company and industry to industry, but also from country to country, in search of undervalued stocks. Hansberger’s objective is to identify undervalued securities, to hold them for the long-term, and to achieve long-term capital growth as the marketplace realizes the value of these securities over time. Hansberger expects to invest in securities across a broad spectrum of market capitalizations. In terms of both industry representation and capitalization, the segment’s holdings may differ significantly from those of the typical international equity fund. Hansberger generally sells a security if its price target is met, the company’s fundamentals change, or if the Fund is fully invested and a better investment opportunity arises. Although the Fund normally invests substantially all of its assets in equity securities, the Fund may temporarily hold up to 20% of its assets in cash (U.S. dollars) and/or invest in money market instruments or other high quality debt securities as it seeks other investment opportunities. The Fund may engage in active and frequent trading of securities and other instruments. Effects of frequent trading may include high transaction costs, which may lower the Fund’s returns, and realization of short-term capital gains, distributions of which are taxable to shareholders who are individuals as ordinary income. Trading costs and tax effects associated with frequent trading may adversely affect the Fund’s performance.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund. Currency Risk: Fluctuations in the exchange rates between different currencies may negatively affect an investment. The Fund may elect not to hedge currency risk, or may hedge such risk imperfectly, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged. Emerging Markets Risk: Investing in emerging markets companies, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in companies in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization, accounting standards and transparency, and regulatory oversight in emerging market economies is generally less than in more developed markets. Equity Securities Risk: The value of the Fund’s investments in equity securities could be subject to unpredictable declines in the value of individual securities and periods of below-average performance in individual securities or in the equity market as a whole. Growth stocks are generally more sensitive to market movements than other types of stocks primarily because their stock prices are based heavily on future expectations. If the subadviser’s assessment of the prospects for a company’s growth is wrong, or if the subadviser’s judgment of how other investors will value the company’s growth is wrong, then the price of the company’s stock may fall or not approach the value that the subadviser has placed on it. Value stocks can perform differently from the market as a whole and from other types of stocks. Value stocks also present the risk that their lower valuations fairly reflect their business prospects and that investors will not agree that the stocks represent favorable investment opportunities, and they may fall out of favor with investors and underperform growth stocks during any given period. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock. Focused Investment Risk: Because the Fund may invest in a small number of industries or securities, it may have more risk because the impact of a single economic, political or regulatory occurrence may have a greater adverse impact on the Fund’s net asset value. Foreign Securities Risk: Investments in foreign securities may be subject to greater political, economic, environmental, credit and information risks. The Fund’s investments in foreign securities also are subject to foreign currency fluctuations and other foreign currency-related risks. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. Management Risk: A strategy used by the Fund’s portfolio managers may fail to produce the intended result. Market Risk: The market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions. Small- and Mid-Capitalization Companies Risk: Compared to large-capitalization companies, small- and mid-capitalization companies are more likely to have limited product lines, markets or financial resources. Stocks of these companies often trade less frequently and in limited volume and their prices may fluctuate more than stocks of large-cap companies. As a result, it may be relatively more difficult for the Fund to buy and sell securities of small- and mid-cap companies.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Risk/Return Bar Chart and Table
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and table shown below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year-to-year and by showing how the Fund’s average annual returns for the one-year, five-year, ten-year and life-of-Class Y periods compare to those of two broad measures of market performance. The MSCI EAFE Index (Europe, Australasia, Far East) is an unmanaged index that is designed to measure the equity market performance of developed markets, excluding the United States and Canada. The MSCI All Country World Index (ACWI) ex USA is an unmanaged index that is designed to measure the equity market performance of developed markets, excluding the United States. The return information for the index includes both price performance and income from dividend payments, but does not include tax credits. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at ngam.natixis.com and/or by calling the Fund toll-free at 800-225-5478. The chart does not reflect any sales charge that you may be required to pay when you buy or redeem the Fund’s shares. A sales charge will reduce your return.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and table shown below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year-to-year and by showing how the Fund’s average annual returns for the one-year, five-year, ten-year and life-of-Class Y periods compare to those of two broad measures of market performance.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800-225-5478
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	ngam.natixis.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Total Returns for Class A Shares
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The chart does not reflect any sales charge that you may be required to pay when you buy or redeem the Fund’s shares.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Highest Quarterly Return: Second Quarter 2009, 29.29% Lowest Quarterly Return: Third Quarter 2011, -25.24%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (for the periods ended December 31, 2012)
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index performance reflects no deduction for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	The after-tax returns are shown for only one class of the Fund. After-tax returns for the other classes of the Fund will vary.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	The Return After Taxes on Distributions & Sale of Fund Shares for the 5-year period exceeds the Return Before Taxes due to an assumed tax benefit from the pass-through of foreign tax credits and losses on a sale of Fund shares at the end of the measurement period.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	Class B total returns in the table below do not reflect the automatic conversion of Class B shares to Class A shares after eight years.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	Prior to March 1, 2004, the Fund had multiple subadvisers, including the current subadviser. The performance results shown above for the periods prior to March 1, 2004 reflect results achieved by the previous subadvisers using different investment strategies. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts. The after-tax returns are shown for only one class of the Fund. After-tax returns for the other classes of the Fund will vary. The Return After Taxes on Distributions & Sale of Fund Shares for the 5-year period exceeds the Return Before Taxes due to an assumed tax benefit from the pass-through of foreign tax credits and losses on a sale of Fund shares at the end of the measurement period. Index performance reflects no deduction for fees, expenses or taxes.
Hansberger International Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Redemption fees	rr_RedemptionFeeOverRedemption	none
Management fees	rr_ManagementFeesOverAssets	0.80%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.67%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.72%
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.12%	[2],[3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement	rr_NetExpensesOverAssets	1.60%	[2]
1 year	rr_ExpenseExampleYear01	728
3 years	rr_ExpenseExampleYear03	1,075
5 years	rr_ExpenseExampleYear05	1,444
10 years	rr_ExpenseExampleYear10	2,479
2003	rr_AnnualReturn2003	39.02%
2004	rr_AnnualReturn2004	13.60%
2005	rr_AnnualReturn2005	16.12%
2006	rr_AnnualReturn2006	24.08%
2007	rr_AnnualReturn2007	16.38%
2008	rr_AnnualReturn2008	(47.63%)
2009	rr_AnnualReturn2009	45.82%
2010	rr_AnnualReturn2010	8.70%
2011	rr_AnnualReturn2011	(19.80%)
2012	rr_AnnualReturn2012	22.68%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest Quarterly Return:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	29.29%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest Quarterly Return:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(25.24%)
Past 1 Year	rr_AverageAnnualReturnYear01	15.63%
Past 5 Years	rr_AverageAnnualReturnYear05	(5.10%)
Past 10 Years	rr_AverageAnnualReturnYear10	7.38%
Hansberger International Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOfferingPrice	5.00%
Redemption fees	rr_RedemptionFeeOverRedemption	none
Management fees	rr_ManagementFeesOverAssets	0.80%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.68%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.48%
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.13%	[2],[3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement	rr_NetExpensesOverAssets	2.35%	[2]
1 year	rr_ExpenseExampleYear01	738
3 years	rr_ExpenseExampleYear03	1,060
5 years	rr_ExpenseExampleYear05	1,509
10 years	rr_ExpenseExampleYear10	2,619
1 year	rr_ExpenseExampleNoRedemptionYear01	238
3 years	rr_ExpenseExampleNoRedemptionYear03	760
5 years	rr_ExpenseExampleNoRedemptionYear05	1,309
10 years	rr_ExpenseExampleNoRedemptionYear10	2,619
Past 1 Year	rr_AverageAnnualReturnYear01	16.80%
Past 5 Years	rr_AverageAnnualReturnYear05	(5.04%)
Past 10 Years	rr_AverageAnnualReturnYear10	7.22%
Hansberger International Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Redemption fees	rr_RedemptionFeeOverRedemption	none
Management fees	rr_ManagementFeesOverAssets	0.80%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.67%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.47%
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.12%	[2],[3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement	rr_NetExpensesOverAssets	2.35%	[2]
1 year	rr_ExpenseExampleYear01	338
3 years	rr_ExpenseExampleYear03	758
5 years	rr_ExpenseExampleYear05	1,305
10 years	rr_ExpenseExampleYear10	2,797
1 year	rr_ExpenseExampleNoRedemptionYear01	238
3 years	rr_ExpenseExampleNoRedemptionYear03	758
5 years	rr_ExpenseExampleNoRedemptionYear05	1,305
10 years	rr_ExpenseExampleNoRedemptionYear10	2,797
Past 1 Year	rr_AverageAnnualReturnYear01	20.78%
Past 5 Years	rr_AverageAnnualReturnYear05	(4.69%)
Past 10 Years	rr_AverageAnnualReturnYear10	7.22%
Hansberger International Fund | Class Y
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Redemption fees	rr_RedemptionFeeOverRedemption	none
Management fees	rr_ManagementFeesOverAssets	0.80%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.65%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.45%
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.10%	[2],[3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement	rr_NetExpensesOverAssets	1.35%	[2]
1 year	rr_ExpenseExampleYear01	137
3 years	rr_ExpenseExampleYear03	449
5 years	rr_ExpenseExampleYear05	783
10 years	rr_ExpenseExampleYear10	1,727
Past 1 Year	rr_AverageAnnualReturnYear01	22.94%
Life of Class Y	rr_AverageAnnualReturnSinceInception	15.12%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 14, 2011
Hansberger International Fund | Return After Taxes on Distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	15.70%
Past 5 Years	rr_AverageAnnualReturnYear05	(5.18%)
Past 10 Years	rr_AverageAnnualReturnYear10	6.82%
Hansberger International Fund | Return After Taxes on Distributions & Sale of Fund Shares | Class A
Risk/Return:	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	10.34%
Past 5 Years	rr_AverageAnnualReturnYear05	(4.17%)
Past 10 Years	rr_AverageAnnualReturnYear10	6.51%
Hansberger International Fund | MSCI EAFE Index
Risk/Return:	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	17.90%
Past 5 Years	rr_AverageAnnualReturnYear05	(3.21%)
Past 10 Years	rr_AverageAnnualReturnYear10	8.70%
Life of Class Y	rr_AverageAnnualReturnSinceInception	13.40%
Hansberger International Fund | MSCI ACWI ex USA
Risk/Return:	rr_RiskReturnAbstract
Past 1 Year	rr_AverageAnnualReturnYear01	17.39%
Past 5 Years	rr_AverageAnnualReturnYear05	(2.44%)
Past 10 Years	rr_AverageAnnualReturnYear10	10.22%
Life of Class Y	rr_AverageAnnualReturnSinceInception	12.03%

[1] The expense information shown in the table 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 (expenses indirectly borne by the Fund through investments in certain pooled investment vehicles).

[2] The Fund's fee waiver and/or expense reimbursement and total annual fund operating expenses after fee waiver and/or reimbursement have been restated to reflect current expense cap arrangements.

[3] 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 1.60%, 2.35%, 2.35% and 1.35% of the Fund's average daily net assets for Class A, B, 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 April 30, 2014 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 the expenses in later periods fall below 1.60%, 2.35%, 2.35% and 1.35% of the Fund's average daily net assets for Class A, B, C and Y 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 fee or expenses were waived/reimbursed.