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

The total expense ratio cap of Class IS shares of the Portfolio has 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 Leaders 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)
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example information under the section of the Prospectus entitled "Portfolio Summary—Emerging Markets Leaders 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 Leaders Portfolio | Class I  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.64%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.54% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.34%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.20% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 122
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 381
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 122
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 381
Emerging Markets Leaders Portfolio | Class A  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.33%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.48% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.93%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.55% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 674
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 989
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 674
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 989
Emerging Markets Leaders Portfolio | Class L  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 1.03%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.68% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.63%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.05% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 208
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 643
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 208
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 643
Emerging Markets Leaders Portfolio | Class C  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 1.03%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.93% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.63%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.30% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 333
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 718
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 233
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 718
Emerging Markets Leaders Portfolio | Class IS  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.90%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.63%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.53% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.43%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.10% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 350
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 112
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 350
[1] 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 reimbursements will continue for at least three years from the date of the applicable Emerging Markets Leaders Reorganization (as defined in the section of this Prospectus entitled "Fund Management-Advisory Fees") 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.