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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Apr. 30, 2012
ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (Prospectus Summary): | ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Active International Allocation 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:

Active International Allocation Portfolio
Asian Equity Portfolio
Emerging Markets Portfolio
Global Franchise Portfolio
International Equity Portfolio
International Small Cap Portfolio
Select Global Infrastructure Portfolio
(collectively, the "Portfolios")

 
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 50,000
Expense, Heading rr_ExpenseHeading The first paragraph in each Portfolio's 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 52 of this Prospectus.

 
Shareholder Fees, Caption rr_ShareholderFeesCaption With respect to each of the Active International Allocation, Asian Equity, Emerging Markets, International Equity and International Small Cap Portfolios, the following table replaces the "Shareholder Fees" table with respect to Class P shares only in each such Portfolio's section of the Prospectus entitled "Portfolio Summary—Fees and Expenses:"  
Expense Example, Heading rr_ExpenseExampleHeading The following tables replace the "Example" tables with respect to Class P shares only in each Portfolio's section of the Prospectus entitled "Portfolio Summary—Example:"  
Average Annual Returns, Caption rr_AverageAnnualReturnCaption With respect to the Active International Allocation Portfolio, the following table replaces the "Average Annual Total Returns" table with respect to Class P shares only in such Portfolio's section of the Prospectus entitled "Portfolio Summary—Performance Information—Average Annual Total Returns:"  
Supplement Closing ck0000836487_SupplementClosingTextBlock

Please retain this supplement for future reference.

 
ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO | Class P
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MSIBX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase) rr_RedemptionFeeOverRedemption (2.00%)
Expense Example, By Year, Column rr_ExpenseExampleByYearColumnName Class P
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 636
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 871
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,125
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,849
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class P Return before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (19.22%) [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (4.93%) [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.01% [1]
[1] The historical performance of Class P shares has been restated to reflect the current maximum initial sales charge of 5.25%.