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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading EMERGING MARKETS DOMESTIC DEBT PORTFOLIO
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Emerging Markets Domestic Debt Portfolio (the "Portfolio") seeks high total return by investing primarily in fixed income securities of government and government-related issuers and, to a lesser extent, of corporate issuers in emerging market countries.

Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value ("NAV") of Class A shares of the Portfolio purchased in a single transaction, together with the NAV of all Class A shares of other portfolios of Morgan Stanley Institutional Fund, Inc. (the "Fund") or Class A shares of other Morgan Stanley Multi-Class Funds (as defined in the section of this Prospectus entitled "Shareholder Information—Exchange Privilege") held in Related Accounts (as defined in the section of this Prospectus entitled "Shareholder Information—How To Purchase Class A Shares"), amounts to $25,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary and in the section of this Prospectus entitled "Shareholder Information—How To Purchase Class A Shares."

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Portfolio pays transaction costs 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 when Portfolio shares are held in a taxable account. These costs, which are not reflected in Total Annual Portfolio Operating Expenses or in the Example, affect Portfolio performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 117% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 117.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds.


The example assumes that you invest $10,000 in the Portfolio, your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal circumstances, at least 80% of the Portfolio's assets will be invested in debt securities of issuers located in emerging market countries that are denominated in the local currency. This policy may be changed without shareholder approval; however, you would be notified in writing of any changes.


The Adviser seeks high total return by investing primarily in fixed income securities of government and government-related issuers and, to a lesser extent, of corporate issuers in emerging market countries. The Adviser implements a top down assessment of the global economic environment and the sensitivity of emerging economies in general to worldwide events. In selecting the Portfolio's investments, the Adviser analyzes the ability of an emerging market country's government to formulate and implement fiscal and economic policies; socio-political factors, including political risks, election calendars, human development and social stability; and exchange rate and interest rate valuation.


The Portfolio's holdings may range in maturity from overnight to 30 years or more and will not be subject to any minimum credit rating standard. The Adviser generally considers selling a portfolio holding when it determines that the holding no longer satisfies its investment criteria.


The Portfolio may invest in fixed income securities that are rated below "investment grade" or are not rated, but are of equivalent quality. These fixed income securities are often referred to as "high yield securities" or "junk bonds." High yield securities are fixed income securities rated below Baa by Moody's Investors Service, Inc. ("Moody's") or below BBB by Standard & Poor's Rating Group, a division of The McGraw-Hill Companies, Inc. ("S&P"), or if unrated considered by the Adviser to be an appropriate investment for the Portfolio.


The Portfolio may, but it is not required to, use derivative instruments for a variety of purposes, including hedging, risk management, portfolio management or to earn income. The Portfolio's use of derivatives may involve the purchase and sale of derivative instruments such as futures, options, swaps, structured investments and other related instruments and techniques. The Portfolio may utilize foreign currency forward exchange contracts, which are also derivatives, in connection with its investments in foreign securities. The Portfolio may also invest in restricted and illiquid securities. Derivative instruments used by the Portfolio will be counted toward the Portfolio's 80% policy discussed above to the extent they have economic characteristics similar to the securities included within that policy.

Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There is no assurance that the Portfolio will achieve its investment objective and you can lose money investing in this Portfolio. The principal risks of investing in the Portfolio include:


•  Fixed Income Securities. Fixed income securities are subject to the risk of the issuer's inability to meet principal and interest payments on its obligations (i.e., credit risk) and are subject to price volatility resulting from, among other things, interest rate sensitivity, market perception of the creditworthiness of the issuer and general market liquidity (i.e., market risk). The historically low interest rate environment increases the risks associated with rising interest rates, including the potential for periods of volatility and increased redemptions. The Portfolio may face a heightened level of risk, especially since the Federal Reserve Board has begun tapering its quantitative easing program and may begin to raise rates. The Portfolio is not limited as to the maturities of the securities in which it may invest. Securities with longer durations are likely to be more sensitive to changes in interest rates, generally making them more volatile than securities with shorter durations. Lower rated fixed income securities have greater volatility because there is less certainty that principal and interest payments will be made as scheduled. Investing in emerging markets intensifies this risk, because lower quality fixed income securities are more volatile in price.


•  High Yield Securities ("Junk Bonds"). The Portfolio's investments in high yield securities expose it to a substantial degree of credit risk. Investing in emerging markets intensifies risk, because high yield securities may be more volatile in price in certain environments. High yield securities may be issued by companies that are restructuring, are smaller and less creditworthy or are more highly indebted than other companies, and therefore they may have more difficulty making scheduled payments of principal and interest. High yield securities are subject to greater risk of loss of income and principal than higher rated securities and may be considered speculative. High yield securities may experience reduced liquidity, and sudden and substantial decreases in price. An economic downturn affecting an issuer of high yield securities may result in an increased incidence of default. In the event of a default, the Portfolio may incur additional expenses to seek recovery.


•  Foreign and Emerging Market Securities. Investments in foreign markets entail special risks such as currency, political, economic and market risks. There also may be greater market volatility, less reliable financial information, higher transaction and custody costs, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets, which have historically been considered stable, may become more volatile and subject to increased risk due to ongoing developments and changing conditions in such markets. Moreover, the growing interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments, the imposition of economic sanctions against a particular country or countries, organizations, entities and/or individuals, changes in international trading patterns, trade barriers, and other protectionist or retaliatory measures. Economic sanctions could, among other things, effectively restrict or eliminate the Portfolio's ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Portfolio's investments in such securities harder to value. Investments in foreign markets may also be adversely affected by governmental actions such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets, or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Portfolio, particularly during periods of market turmoil. When the Portfolio holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than risks associated with investments in foreign developed countries. In addition, a substantial portion of the Portfolio's investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of the investment will fluctuate with the U.S. dollar exchange rates. To the extent hedged by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Portfolio's securities are not denominated. The use of foreign currency forward exchange contracts involves the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.


•  Sovereign Debt Securities. Investing in sovereign debt securities will expose the Portfolio to the direct or indirect consequences of political, social or economic changes in the countries that issue the securities. The issuer or governmental authority that controls the repayment of sovereign debt may not be willing or able to repay the principal and/or pay interest when it becomes due, due to factors such as debt service burden, political constraints, cash flow problems and other national economic factors. In addition, foreign governments may default on their debt securities, which may require holders of such securities to participate in debt rescheduling or additional lending to defaulting governments. Moreover, there is no bankruptcy proceeding by which defaulted sovereign debt may be collected in whole or in part.


•  Leverage. The Portfolio may borrow money for investment purposes. Borrowing for investment purposes is a speculative activity that creates leverage. Leverage will magnify the effect of increases and decreases in prices of portfolio securities.


•  Liquidity. The Portfolio's investments in restricted and illiquid securities may entail greater risk than investments in publicly traded securities. These securities may be more difficult to sell, particularly in times of market turmoil. Additionally, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Illiquid securities may be more difficult to value. If the Portfolio is forced to sell an illiquid security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss.


•  Derivatives. A derivative instrument often has risks similar to its underlying asset and may have additional risks, including imperfect correlation between the value of the derivative and the underlying asset, risks of default by the counterparty to certain transactions, magnification of losses incurred due to changes in the market value of the securities, instruments, indices or interest rates to which the derivative instrument relates and risks that the transactions may not be liquid. Certain derivative transactions may give rise to a form of leverage. Leverage magnifies the potential for gain and the risk of loss.


•  Non-Diversification. Because the Portfolio is non-diversified, it may be more susceptible to an adverse event affecting a portfolio investment than a diversified portfolio and a decline in the value of that instrument would cause the Portfolio's overall value to decline to a greater degree.


Shares of the Portfolio are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney There is no assurance that the Portfolio will achieve its investment objective and you can lose money investing in this Portfolio.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Because the Portfolio is non-diversified, it may be more susceptible to an adverse event affecting a portfolio investment than a diversified portfolio and a decline in the value of that instrument would cause the Portfolio's overall value to decline to a greater degree.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Shares of the Portfolio are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio's Class I shares' performance from year-to-year and by showing how the Portfolio's average annual returns for the past one, five and 10 year periods and since inception compare with those of a broad measure of market performance, as well as an average that represents a group of similar mutual funds, over time. The performance of the other Classes, which is shown in the table below, will differ because the Classes have different ongoing fees. The Portfolio's returns include the maximum applicable sales charge for Class A and assume you sold your shares at the end of each period (unless otherwise noted). The Portfolio's past performance, before and after taxes, is not necessarily an indication of how the Portfolio will perform in the future. Updated performance information is available online at www.morganstanley.com/im.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio's Class I shares' performance from year-to-year and by showing how the Portfolio's average annual returns for the past one, five and 10 year periods and since inception compare with those of a broad measure of market performance, as well as an average that represents a group of similar mutual funds, over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio's past performance, before and after taxes, is not necessarily an indication of how the Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns-Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

High Quarter

 

6/30/09

   

14.49

%

 

Low Quarter

 

9/30/11

   

–10.08

%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.49%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.08%)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Portfolio's returns include the maximum applicable sales charge for Class A and assume you sold your shares at the end of each period (unless otherwise noted).
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the table above are calculated using the historical highest individual federal marginal income tax rates during the period shown 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 the investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their Portfolio shares through tax deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for the Portfolio's other Classes will vary from Class I shares' returns.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher After-tax returns may be higher than before-tax returns due to an assumed benefit from capital losses that would have been realized had Portfolio shares been sold at the end of the relevant periods, as applicable.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table above are calculated using the historical highest individual federal marginal income tax rates during the period shown and do not reflect the impact of state and local taxes. After-tax returns for the Portfolio's other Classes will vary from Class I shares' returns. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their Portfolio shares through tax deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns may be higher than before-tax returns due to an assumed benefit from capital losses that would have been realized had Portfolio shares been sold at the end of the relevant periods, as applicable.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the calendar periods ended December 31, 2013)
JP Morgan EMBI Global Bond Index/JP Morgan GBI-EM Global Diversified Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (8.98%) [1]
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 8.06% [1]
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 7.33% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.12% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 01, 1994 [1]
Lipper Emerging Markets Local Currency Debt Funds Average (reflects no deduction for taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (9.05%) [3]
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 8.08% [3]
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 5.99% [3]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.41% [2],[3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 01, 1994 [3]
CLASS I
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Advisory Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.64%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.39% [4]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.54%) [4]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.85% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 271
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 471
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,049
Annual Return 2004 rr_AnnualReturn2004 10.07%
Annual Return 2005 rr_AnnualReturn2005 12.78%
Annual Return 2006 rr_AnnualReturn2006 11.08%
Annual Return 2007 rr_AnnualReturn2007 4.68%
Annual Return 2008 rr_AnnualReturn2008 (10.07%)
Annual Return 2009 rr_AnnualReturn2009 23.75%
Annual Return 2010 rr_AnnualReturn2010 15.07%
Annual Return 2011 rr_AnnualReturn2011 (3.66%)
Annual Return 2012 rr_AnnualReturn2012 16.89%
Annual Return 2013 rr_AnnualReturn2013 (12.54%)
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (12.54%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 7.00%
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 6.12%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.70%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 01, 1994
CLASS I | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (13.80%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 5.09%
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 4.03%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.66%
CLASS I | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (7.05%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 4.86%
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 4.08%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.22%
CLASS A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.25% [5]
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%) [5]
Advisory Fee rr_ManagementFeesOverAssets 0.75% [5]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25% [5]
Other Expenses rr_OtherExpensesOverAssets 0.72% [5]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.72% [4],[5]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [4],[5]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.20% [4],[5]
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value ("NAV") of Class A shares of the Portfolio purchased in a single transaction, together with the NAV of all Class A shares of other portfolios of Morgan Stanley Institutional Fund, Inc. (the "Fund") or Class A shares of other Morgan Stanley Multi-Class Funds (as defined in the section of this Prospectus entitled "Shareholder Information-Exchange Privilege") held in Related Accounts (as defined in the section of this Prospectus entitled "Shareholder Information-How To Purchase Class A Shares"), amounts to $25,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 542 [5]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 790 [5]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,057 [5]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,818 [5]
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (16.47%) [5]
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 5.82% [5]
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 5.40% [5]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.49% [5]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 02, 1996 [5]
Class L
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Advisory Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.50% [6]
Other Expenses rr_OtherExpensesOverAssets 0.70%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.95% [4]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [4]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.45% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 148
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 459
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 792
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,735
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (13.00%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 6.24%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.24%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 16, 2008
[1] The JP Morgan EMBI Global Bond Index/JP Morgan GBI-EM Global Diversified Bond Index is a custom index represented by performance of the JP Morgan EMBI Global Bond Index (which tracks the performance of U.S. dollar-denominated debt instruments issued by emerging markets) for periods from the Portfolio's inception to September 30, 2007 and the JP Morgan GBI-EM Global Diversified Bond Index (which tracks local currency government bonds issued by emerging markets) for periods thereafter. It is not possible to invest directly in an index.
[2] Since Inception reflects the inception date of Class I.
[3] The Lipper Emerging Markets Local Currency Debt Funds Average tracks the performance of all funds in the Lipper Emerging Markets Local Currency Debt Funds classification.
[4] The Portfolio's "Adviser," Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee and/or reimburse the Portfolio so that Total Annual Portfolio Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.85% for Class I, 1.20% for Class A and 1.45% for Class L. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Directors acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[5] Effective September 9, 2013, Class P shares were renamed Class A shares.
[6] The Board of Directors approved an amendment to the Distribution and Shareholder Services Plan reducing the distribution and shareholder services (12b-1) fee for the Portfolio's Class L shares from 0.75% to 0.50% of the average daily net assets of such Class, effective February 25, 2013. The Distribution and/or Shareholder Service (12b-1) Fee shown in the table above has been restated to reflect such change.