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Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000836487_SupplementTextBlock

Prospectus Supplement


February 27, 2015


Morgan Stanley Institutional Fund, Inc.


Supplement dated February 27, 2015 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated April 30, 2014


Advantage Portfolio
Global Advantage Portfolio
(collectively, the "Portfolios")


The contractual advisory fee rates of the Portfolios have been decreased, effective March 2, 2015. Accordingly, effective March 2, 2015, the Prospectus is hereby amended as follows:


With respect to the Global Advantage Portfolio:

Risk/Return [Heading] rr_RiskReturnHeading Global Advantage Portfolio
Expense [Heading] rr_ExpenseHeading The Portfolio's Annual Portfolio Operating Expenses table under the section of the Prospectus entitled "Portfolio Summary—Global Advantage Portfolio—Fees and Expenses—Annual Portfolio Operating Expenses" is hereby deleted in its entirety and replaced with the following:
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The Advisory Fee has been restated to reflect the decrease in the advisory fee schedule effective March 2, 2015.
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

***


Please retain this supplement for future reference.

Class I
 
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
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[1]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 7.17%rr_OtherExpensesOverAssets
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Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 7.97%rr_ExpensesOverAssets
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[2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (6.87%)rr_FeeWaiverOrReimbursementOverAssets
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[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.10%rr_NetExpensesOverAssets
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[2]
Class A
 
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
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[1],[3]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
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[3]
Other Expenses rr_OtherExpensesOverAssets 7.28%rr_OtherExpensesOverAssets
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= ck0000836487_S000030616Member
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= ck0000836487_C000094893Member
[3]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 8.33%rr_ExpensesOverAssets
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[2],[3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (6.88%)rr_FeeWaiverOrReimbursementOverAssets
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= ck0000836487_S000030616Member
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= ck0000836487_C000094893Member
[2],[3]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.45%rr_NetExpensesOverAssets
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[2],[3]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments that are not subject to any sales charges at the time of purchase are subject to a contingent deferred sales charge ("CDSC") of 1.00% that will be imposed if you sell your shares within 18 months after the last day of the month of purchase, except for certain specific circumstances. See "Shareholder Information—How to Redeem Portfolio Shares—CDSC on Class A Shares" for further information about the CDSC waiver categories.
Class L
 
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
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[1]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%rr_DistributionAndService12b1FeesOverAssets
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= ck0000836487_C000094892Member
Other Expenses rr_OtherExpensesOverAssets 7.42%rr_OtherExpensesOverAssets
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= ck0000836487_S000030616Member
/ rr_ProspectusShareClassAxis
= ck0000836487_C000094892Member
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 8.97%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= ck0000836487_S000030616Member
/ rr_ProspectusShareClassAxis
= ck0000836487_C000094892Member
[2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (7.02%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= ck0000836487_S000030616Member
/ rr_ProspectusShareClassAxis
= ck0000836487_C000094892Member
[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.95%rr_NetExpensesOverAssets
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[2]
[1] The Advisory Fee has been restated to reflect the decrease in the advisory fee schedule effective March 2, 2015.
[2] 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 1.10% for Class I, 1.45% for Class A and 1.95% 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.
[3] Effective September 9, 2013, Class P shares were renamed Class A shares.