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EMERGING MARKETS PORTFOLIO  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000836487_SupplementTextBlock

Prospectus Supplement


September 22, 2015


Morgan Stanley Institutional Fund, Inc.


Supplement dated September 22, 2015 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated April 30, 2015


Emerging Markets Portfolio
(the "Portfolio")
Risk/Return [Heading] rr_RiskReturnHeading EMERGING MARKETS PORTFOLIO
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The contractual advisory fee rate of the Portfolio and total expense ratio caps of each share class of the Portfolio have been decreased, effective September 30, 2015. Accordingly, effective September 30, 2015, the Prospectus is hereby amended as follows:


The Portfolio's Annual Portfolio Operating Expenses table under the section of the Prospectus entitled "Portfolio Summary—Emerging Markets Portfolio—Fees and Expenses—Annual Portfolio Operating Expenses" is hereby deleted in its entirety and replaced with the following:
Operating Expenses Caption [Text] rr_OperatingExpensesCaption 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 September 30, 2015.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example information under the section of the Prospectus entitled "Portfolio Summary—Emerging Markets Portfolio—Fees and Expenses—Example" is hereby deleted in its entirety and replaced with the following:


Example
The example below is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds.


The example assumes that you invest $10,000 in the Portfolio, your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If You SOLD Your Shares:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If You HELD Your Shares:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

Please retain this supplement for future reference.
EMERGING MARKETS PORTFOLIO | CLASS I  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90% [1]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.20% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.20% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 122
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 381
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 660
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,455
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 122
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 381
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 660
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,455
EMERGING MARKETS PORTFOLIO | CLASS A  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90% [1]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.35%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.50% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.50% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 670
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 974
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,300
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,222
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 670
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 974
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,300
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,222
EMERGING MARKETS PORTFOLIO | Class L  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90% [1]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 1.00%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.65% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.60%) [2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.05% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 208
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 643
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,103
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,379
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 208
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 643
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,103
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,379
EMERGING MARKETS PORTFOLIO | Class C  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90% [1]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 1.00%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.90% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.60%) [2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.30% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 333
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 718
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,230
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,636
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 233
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 718
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,230
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,636
EMERGING MARKETS PORTFOLIO | Class IS  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90% [1]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.20%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.10% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.10% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 350
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 606
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,340
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 112
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 350
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 606
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,340
[1] The Advisory Fee has been restated to reflect the decrease in the advisory fee schedule effective September 30, 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 1.20% for Class I, 1.55% for Class A, 2.05% for Class L, 2.30% for Class C and 1.10% for Class IS. The fee waivers and/or expense reimbursement 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.