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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Apr. 30, 2012
Opportunity Portfolio (Prospectus Summary): | Opportunity Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Opportunity 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:

Global Opportunity Portfolio
International Opportunity Portfolio
Opportunity 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 25 of this Prospectus.

 
Shareholder Fees, Caption rr_ShareholderFeesCaption With respect to each of the Global Opportunity and Opportunity 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 Opportunity 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.

 
Opportunity Portfolio | Class P
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol MEGPX
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 634
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 865
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,115
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,827
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class P (commenced operations on 5/21/10) Return before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.93%) [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 none [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 none [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.69% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 21, 2010 [1]
[1] The historical performance of Class P shares has been restated to reflect the current maximum initial sales charge of 5.25%.