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Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000836487_SupplementTextBlock

Prospectus Supplement


October 1, 2013


Morgan Stanley Institutional Fund, Inc.


Supplement dated October 1, 2013 to the Morgan Stanley Institutional Fund, Inc. (the "Fund") Prospectus dated April 30, 2013 of:


Opportunity Portfolio (the "Portfolio")

Risk/Return [Heading] rr_RiskReturnHeading Opportunity Portfolio
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading The section of the Prospectus entitled "Portfolio Summary-Opportunity Portfolio-Performance Information" is hereby deleted and replaced with the following:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Pursuant to an agreement and plan of reorganization between the Fund, on behalf of the Portfolio, and Van Kampen Series Fund, Inc., on behalf of the Van Kampen Equity Growth Fund (the "Predecessor Fund"), on May 21, 2010 the Portfolio acquired substantially all of the assets and substantially all of the liabilities of the Predecessor Fund in exchange for Class I and Class L shares of the Portfolio (the "Reorganization").


Pursuant to the Reorganization, Class C and Class I shareholders of the Predecessor Fund received Class L and Class I shares, respectively, of the Portfolio. As a result of the Reorganization, the Portfolio is the accounting successor of the Predecessor Fund.


The historical performance information shown below reflects, for the period prior to the Reorganization, the historical performance of the Class C and Class I shares of the Predecessor Fund.


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 L 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 index 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 performance information in the bar chart does not reflect the deduction of sales charges; if these amounts were reflected, returns would be less than shown. The Portfolio's returns in the table 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 L 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 index 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 Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The performance information in the bar chart does not reflect the deduction of sales charges; if these amounts were reflected, returns would be less than shown.
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

*  Performance shown for the Portfolio's Class L shares reflects the performance of the Class C shares of the Predecessor Fund for periods prior to May 21, 2010. The Portfolio previously disclosed the total return of Class H shares. However, effective September 9, 2013, Class H shares were reclassified as Class P shares (subsequently renamed Class A shares). The bar chart now shows Class L shares which is the class of shares with the longest performance history.

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

High Quarter

 

6/30/09

   

23.87

%

 

Low Quarter

 

12/31/08

   

–28.99

%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.87%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.99%)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Portfolio's returns in the table 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 L 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 L 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.


Please retain this supplement for future reference.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the calendar periods ended December 31, 2012)
Russell 1000® Growth Index Class L Comparison (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.26% [1],[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.12% [1],[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.52% [1],[2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.75% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 28, 1998 [1],[2]
Lipper Multi-Cap Growth Funds Index Class L Comparison (reflects no deduction for taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.88% [1],[3]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.41% [1],[3]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.06% [1],[3]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.46% [1],[3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 28, 1998 [1],[3]
Russell 1000® Growth Index Class I Comparison (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.26% [1],[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.12% [1],[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10    [1],[2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.28% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 12, 2005 [1],[2]
Lipper Multi-Cap Growth Funds Index Class I Comparison (reflects no deduction for taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.88% [1],[3]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.41% [1],[3]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10    [1],[3]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.60% [1],[3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 12, 2005 [1],[3]
Russell 1000® Growth Index Class A Comparison (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.26% [1],[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05    [1],[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10    [1],[2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.27% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 21, 2010 [1],[2]
Lipper Multi-Cap Growth Funds Index Class A Comparison(reflects no deduction for taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.88% [1],[3]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05    [1],[3]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10    [1],[3]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 12.51% [1],[3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 21, 2010 [1],[3]
Class I
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.43% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.87% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10    [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.96% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 12, 2005 [1]
Class L
  
Risk/Return: rr_RiskReturnAbstract  
Annual Return 2003 rr_AnnualReturn2003 23.20%
Annual Return 2004 rr_AnnualReturn2004 5.97%
Annual Return 2005 rr_AnnualReturn2005 14.30%
Annual Return 2006 rr_AnnualReturn2006 4.83%
Annual Return 2007 rr_AnnualReturn2007 20.89%
Annual Return 2008 rr_AnnualReturn2008 (51.08%)
Annual Return 2009 rr_AnnualReturn2009 77.06%
Annual Return 2010 rr_AnnualReturn2010 18.57%
Annual Return 2011 rr_AnnualReturn2011 (1.17%)
Annual Return 2012 rr_AnnualReturn2012 8.62%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.62% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.97% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.62% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.35% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 28, 1998 [1]
Class L | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.62% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.97% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.62% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.15% [1]
Class L | After Taxes on Distributions and Sale of Portfolio Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.60% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.68% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.75% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.82% [1]
Class A
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.45% [1],[4]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05    [1],[4]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10    [1],[4]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.13% [1],[4]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 21, 2010 [1],[4]
[1] Performance shown for the Portfolio's Class I and Class L shares reflects the performance of the Class I and Class C shares, respectively, of the Predecessor Fund for periods prior to May 21, 2010.
[2] The Russell 1000® Growth Index measures the performance of the large-cap growth segment of the U.S. equity universe. It includes those Russell 1000® Index companies with higher price-to-book ratios and higher forecasted growth values. The Russell 1000® Index is an index of approximately 1,000 of the largest U.S. companies based on a combination of market capitalization and current index membership. It is not possible to invest directly in an index.
[3] The Lipper Multi-Cap Growth Funds Index is an equally weighted performance index of the largest qualifying funds (based on net assets) in the Lipper Multi-Cap Growth Funds classification. There are currently 30 funds represented in this Index.
[4] Effective September 9, 2013, Class P shares were renamed Class A shares. The historical performance of Class A shares has been restated to reflect the current maximum initial sales charge of 5.25%.