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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Apr. 30, 2012
EMERGING MARKETS DOMESTIC DEBT PORTFOLIO (Prospectus Summary): | EMERGING MARKETS DOMESTIC DEBT PORTFOLIO
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Emerging Markets Domestic Debt Portfolio
Supplement Text ck0000836487_SupplementTextBlock

Prospectus Supplement

January 14, 2013

Morgan Stanley Institutional Fund, Inc.

Supplement dated January 14, 2013 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated April 30, 2012 of:

Emerging Markets Domestic Debt Portfolio
(the "Portfolio")

 
Expense, Heading rr_ExpenseHeading The first paragraph in the section of the Prospectus entitled "Portfolio Summary—Fees and Expenses" is hereby deleted and replaced with the following:  
Expense, Narrative rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. For shareholders of Class P and Class H shares, you may qualify for sales charge discounts if the cumulative net asset value ("NAV") of Class P or Class H shares of the Portfolio purchased in a single transaction, together with the NAV of all Class P or Class H shares of a portfolio of Morgan Stanley Institutional Fund, Inc. (the "Fund") or of a portfolio of Morgan Stanley Institutional Fund Trust held in related accounts, amounts to $25,000 or more with respect to Class P and $50,000 or more with respect to Class H. More information about these and other discounts is available from your financial adviser and in the "Shareholder Information—How To Purchase Class P and Class H Shares" section on page 13 of this Prospectus.

 
Shareholder Fees, Caption rr_ShareholderFeesCaption The following replaces the "Shareholder Fees" table and related footnote thereto with respect to Class P and Class H shares only in the section of the Prospectus entitled "Portfolio Summary—Fees and Expenses:"  
Operating Expenses, Caption rr_OperatingExpensesCaption The following replaces the "Annual Portfolio Operating Expenses" table and related footnotes thereto with respect to Class L shares only in the section of the Prospectus entitled "Portfolio Summary—Fees and Expenses—Annual Portfolio Operating Expenses:"  
Expense Example, Heading rr_ExpenseExampleHeading The following table replaces the "Example" table with respect to Class P, Class H and Class L shares only in the section of the Prospectus entitled "Portfolio Summary—Example:"  
Average Annual Returns, Caption rr_AverageAnnualReturnCaption The following table replaces the "Average Annual Total Returns" table with respect to Class P and Class H shares only in the section of the Prospectus entitled "Portfolio Summary—Performance Information—Average Annual Total Returns:"  
Supplement Closing ck0000836487_SupplementClosingTextBlock

Please retain this supplement for future reference.

 
EMERGING MARKETS DOMESTIC DEBT PORTFOLIO | Class P
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol IEDBX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.25%
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase) rr_RedemptionFeeOverRedemption (2.00%)
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 532
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 760
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,005
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,708
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class P (commenced operations on 1/2/96) Return before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.01%) [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.95% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.99% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.48% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 02, 1996 [1]
EMERGING MARKETS DOMESTIC DEBT PORTFOLIO | Class H
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MSEHX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase) rr_RedemptionFeeOverRedemption (2.00%)
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 508
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 736
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 982
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,687
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class H (commenced operations on 1/2/08) Return before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (7.71%) [2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 none [2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 none [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.96% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 02, 2008 [2]
EMERGING MARKETS DOMESTIC DEBT PORTFOLIO | Class L
  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.50% [3]
Other Expenses rr_OtherExpensesOverAssets 0.44%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.69% [4]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.34%) [4]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.35% [4]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 137
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 428
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 739
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,624
[1] The historical performance of Class P shares has been restated to reflect the current maximum initial sales charge of 4.25%.
[2] The historical performance of Class H shares has been restated to reflect the current maximum initial sales charge of 4.00%.
[3] 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 Service (12b-1) Fees shown in the table above have been restated to reflect such change.
[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, will not exceed 0.85% for Class I, 1.10% for Class P, 1.10% for Class H and 1.35% 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.