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(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Advantage Portfolio (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example below assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 57%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 57.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in established companies with capitalizations within the range of companies included in the Russell 1000® Growth Index. As of December 31, 2024, these market capitalizations ranged between $1.7 billion and $3.8 trillion.
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser typically invests in companies it believes have strong name recognition and sustainable competitive advantages with above average business visibility, the ability to deploy capital at high rates of return, strong balance sheets and an attractive risk/reward. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Adviser actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The Adviser seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The Adviser generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long-term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation.  Although consideration of ESG factors is incorporated into the investment process, it is only one of many tools the Adviser utilizes to make investment decisions.
The Fund may invest in foreign securities, which may include emerging market securities.
In addition to common stocks, the Fund may invest in other types of equity securities. The Fund may also invest in privately placed and restricted securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Pursuant to an agreement and plan of reorganization between the Company, on behalf of the Fund, and Van Kampen Equity Trust II, on behalf of the Van Kampen Core Growth Fund (the “Predecessor Fund”), on May 21, 2010 the Fund 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 Fund (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 Fund. As a result of the Reorganization, the Fund 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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance and one or more additional indexes. The additional index(es) in the table provides a means to compare the Fund’s average annual total returns to a benchmark that the Adviser believes is representative of the Fund’s investment universe. The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees. The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free (800) 869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance and one or more additional indexes.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
06/30/20
46.33%
Low Quarter
06/30/22
-37.97%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns1(for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the  U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed countries. Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange rates.  Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of  the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward
exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Information Technology Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Information Technology Sector Risk. To the extent the Fund invests a substantial portion of its assets in the information technology sector, the value of Fund shares may be particularly impacted by events that adversely affect the information technology sector, such as rapid changes in technology product cycles, product obsolescence, government regulation, and competition, and may fluctuate more than that of a fund that does not invest significantly in companies in the technology sector.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Consumer Discretionary Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Consumer Discretionary Sector Risk. To the extent that the Fund invests a substantial portion of its assets in the consumer discretionary sector, the Fund will be particularly susceptible to the risks associated with companies operating in such sector. Companies in the consumer discretionary sector are subject to risks, including fluctuations in the performance of the overall domestic and international economy, shipment and supply chain disruptions, interest rate changes, currency exchange rates, increased competition and consumer confidence. Performance of such companies may also be adversely affected by factors such as reduced disposable household income, reduced consumer spending, and changing demographics and consumer tastes.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 25.02% [1]
5 Years rr_AverageAnnualReturnYear05 14.53% [1]
10 Years rr_AverageAnnualReturnYear10 13.10% [1]
Since Inception rr_AverageAnnualReturnSinceInception 11.86% [1],[2]
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 33.36% [3]
5 Years rr_AverageAnnualReturnYear05 18.96% [3]
10 Years rr_AverageAnnualReturnYear10 16.78% [3]
Since Inception rr_AverageAnnualReturnSinceInception 14.34% [2],[3]
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.03% [6]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.18% [6]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.85% [6]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 310
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 551
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,243
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 87
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 310
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 551
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,243
Annual Return 2015 rr_AnnualReturn2015 12.56%
Annual Return 2016 rr_AnnualReturn2016 2.82%
Annual Return 2017 rr_AnnualReturn2017 32.06%
Annual Return 2018 rr_AnnualReturn2018 3.74%
Annual Return 2019 rr_AnnualReturn2019 26.60%
Annual Return 2020 rr_AnnualReturn2020 74.79%
Annual Return 2021 rr_AnnualReturn2021 (4.45%)
Annual Return 2022 rr_AnnualReturn2022 (54.54%)
Annual Return 2023 rr_AnnualReturn2023 46.28%
Annual Return 2024 rr_AnnualReturn2024 36.16%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 46.33%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (37.97%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 36.16% [7]
5 Years rr_AverageAnnualReturnYear05 8.62% [7]
10 Years rr_AverageAnnualReturnYear10 11.74% [7]
Since Inception rr_AverageAnnualReturnSinceInception 11.60% [7]
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 35.42% [7],[8]
5 Years rr_AverageAnnualReturnYear05 5.89% [7],[8]
10 Years rr_AverageAnnualReturnYear10 9.66% [7],[8]
Since Inception rr_AverageAnnualReturnSinceInception 10.08% [7],[8]
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 21.46% [7]
5 Years rr_AverageAnnualReturnYear05 6.20% [7]
10 Years rr_AverageAnnualReturnYear10 9.16% [7]
Since Inception rr_AverageAnnualReturnSinceInception 9.52% [7]
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [9]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.39% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.29% [6]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.09% [6]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.20% [6]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 641
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 904
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,187
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,992
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 641
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 904
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,187
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,992
1 Year rr_AverageAnnualReturnYear01 28.59%
5 Years rr_AverageAnnualReturnYear05 7.12%
10 Years rr_AverageAnnualReturnYear10 10.78%
Since Inception rr_AverageAnnualReturnSinceInception 13.06%
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Class L  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75% [10]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.55% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.95% [6]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.96% [6],[10]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.99% [6]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 101
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 519
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 963
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,197
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 101
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 519
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 963
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,197
1 Year rr_AverageAnnualReturnYear01 35.97% [7]
5 Years rr_AverageAnnualReturnYear05 8.49% [7]
10 Years rr_AverageAnnualReturnYear10 11.62% [7]
Since Inception rr_AverageAnnualReturnSinceInception 11.47% [7]
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [11]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.39% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.04% [6]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.09% [6]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.95% [6]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 298
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 631
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,090
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,169
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 198
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 631
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,090
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,169
1 Year rr_AverageAnnualReturnYear01 33.81%
5 Years rr_AverageAnnualReturnYear05 7.51%
Since Inception rr_AverageAnnualReturnSinceInception 10.31% [12]
(MSIF - Counterpoint Global Portfolios) | (Advantage Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.31% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.96% [6]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.15% [6]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.81% [6]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 291
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 516
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,164
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 83
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 291
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 516
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,164
1 Year rr_AverageAnnualReturnYear01 36.19%
5 Years rr_AverageAnnualReturnYear05 8.67%
10 Years rr_AverageAnnualReturnYear10 11.79%
Since Inception rr_AverageAnnualReturnSinceInception 12.47%
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Global Endurance Portfolio (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 157%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 157.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in equity securities of established and emerging companies located throughout the world, with capitalizations within the range of companies included in the MSCI All Country World Index.
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser seeks to invest in companies with strong name recognition and sustainable competitive advantages. The Adviser typically favors companies with rising returns on invested capital, above-average business visibility, strong free cash flow generation and an attractive risk/reward. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Fund will make long-term investments in companies globally that the Adviser believes have the most durable long-term competitive advantages. The Fund may also invest in more moderate growth companies, companies with lower earnings volatility and/or companies with some cyclicality in their end markets.
The Fund may invest in foreign securities, which may include emerging market securities. Under normal market conditions, the Fund typically invests at least 40% of its total assets in the securities of issuers located outside of the United States, unless the Adviser determines, in its sole discretion, that conditions are not favorable. If the Adviser determines that conditions are not favorable, the Fund may invest under 40% of its total assets in the securities of issuers located outside the United States, provided that the Fund will not invest less than 30% of its total assets in such securities except for temporary defensive purposes. In addition, under normal market conditions, the Fund invests in the securities of issuers from at least three different countries, which may include the United States.
In addition to common stocks, the Fund may invest in other types of equity securities, including exchange-traded funds (“ETFs”) (including those which may be managed by the Adviser or its affiliates).
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one and five year periods and since inception compare with those of a broad measure of market performance. The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees.  The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C  and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free 1-800-869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one and five year periods and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C  and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
06/30/20
75.29%
Low Quarter
06/30/22
-40.60%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the  U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed countries. Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange rates.  Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of  the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency
forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Information Technology Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Information Technology Sector Risk. To the extent the Fund invests a substantial portion of its assets in the information technology sector, the value of Fund shares may be particularly impacted by events that adversely affect the information technology sector, such as rapid changes in technology product cycles, product obsolescence, government regulation, and competition, and may fluctuate more than that of a fund that does not invest significantly in companies in the technology sector.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Consumer Discretionary Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Consumer Discretionary Sector Risk. To the extent that the Fund invests a substantial portion of its assets in the consumer discretionary sector, the Fund will be particularly susceptible to the risks associated with companies operating in such sector. Companies in the consumer discretionary sector are subject to risks, including fluctuations in the performance of the overall domestic and international economy, shipment and supply chain disruptions, interest rate changes, currency exchange rates, increased competition and consumer confidence. Performance of such companies may also be adversely affected by factors such as reduced disposable household income, reduced consumer spending, and changing demographics and consumer tastes.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | ETFs [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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ETFs. Shares of ETFs have many of the same risks as direct investments in common stocks or bonds and their market value may differ from their NAV because the supply and demand in the market for ETF shares at any point in time is not always identical to the supply and demand in the market for the underlying securities. As a shareholder in an ETF, the Fund would bear its ratable share of that entity’s expenses while continuing to pay its own investment management fees and other expenses. As a result, the Fund and its shareholders will, in effect, be absorbing fees at two levels. Furthermore, disruptions in the markets for the securities underlying ETFs purchased or sold by the Fund could result in losses on the Fund’s investment in ETFs.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Small and Mid Cap Companies [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Small and Mid Cap Companies. Investments in small and mid cap companies may involve greater risks than investments in larger, more established companies. The securities issued by small and mid cap companies may be less liquid and such companies may have more limited markets, financial resources and product lines, and may lack the depth of management of larger companies.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Healthcare Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Healthcare Sector Risk. The profitability of companies in the healthcare sector may be adversely affected by, among other things, extensive government regulation, restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure, costs associated with obtaining and protecting patents, product liability and other claims, an increased emphasis on outpatient services, changes in the demand for medical products and services, a limited number of products, industry innovation, changes in technologies and other market, economic and public health developments. To the extent that the Fund concentrates its investments in one or more individual industries comprising the healthcare sector (such as, but not limited to, biotechnology, pharmaceuticals, medical equipment and supplies, healthcare technology, healthcare providers and services, and life sciences tools and services companies), the Fund will be particularly susceptible to the risks associated with
such industry or industries, which may include the risks described above as well as other risks specific to such industry or industries.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Portfolio Turnover [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Portfolio Turnover. Consistent with its investment policies, the Fund will purchase and sell securities without regard to the effect on portfolio turnover. Higher portfolio turnover will cause the Fund to incur additional transaction costs.
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | MSCI All Country World Net Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 17.49% [13]
5 Years rr_AverageAnnualReturnYear05 10.06% [13]
Since Inception rr_AverageAnnualReturnSinceInception 12.66% [13],[14]
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.89%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69% [15]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.69% [15]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.00% [15]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 465
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 853
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,940
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 465
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 853
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,940
Annual Return 2019 rr_AnnualReturn2019 30.30%
Annual Return 2020 rr_AnnualReturn2020 110.03%
Annual Return 2021 rr_AnnualReturn2021 9.59%
Annual Return 2022 rr_AnnualReturn2022 (66.23%)
Annual Return 2023 rr_AnnualReturn2023 72.56%
Annual Return 2024 rr_AnnualReturn2024 5.98%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 75.29%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (40.60%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 5.98%
5 Years rr_AverageAnnualReturnYear05 7.28%
Since Inception rr_AverageAnnualReturnSinceInception 10.82%
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 5.85% [16]
5 Years rr_AverageAnnualReturnYear05 6.65% [16]
Since Inception rr_AverageAnnualReturnSinceInception 10.27% [16]
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 3.64%
5 Years rr_AverageAnnualReturnYear05 5.74%
Since Inception rr_AverageAnnualReturnSinceInception 8.71%
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [17]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.99%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.04% [15]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.69% [15]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.35% [15]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 655
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,068
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,505
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,717
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 655
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,068
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,505
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,717
1 Year rr_AverageAnnualReturnYear01 none
5 Years rr_AverageAnnualReturnYear05 5.73%
Since Inception rr_AverageAnnualReturnSinceInception 9.43%
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [18]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.16%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.96% [15]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.86% [15]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.10% [15]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 313
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 835
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,482
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,001
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 213
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 835
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,482
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,001
1 Year rr_AverageAnnualReturnYear01 3.83%
5 Years rr_AverageAnnualReturnYear05 6.11%
Since Inception rr_AverageAnnualReturnSinceInception 9.61%
(MSIF - Counterpoint Global Portfolios) | (Global Endurance Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 10.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 11.05% [15]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 10.10% [15]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.95% [15]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,168
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,017
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,259
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,168
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,017
1 Year rr_AverageAnnualReturnYear01 6.05%
5 Years rr_AverageAnnualReturnYear05 7.32%
Since Inception rr_AverageAnnualReturnSinceInception 10.86%
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Global Insight Portfolio (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example below assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement
for only the first year). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 54%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 54.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in established and emerging companies located throughout the world, with capitalizations within the range of companies included in the MSCI All Country World Net Index.
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser typically invests in unique companies it believes have sustainable competitive advantages with above average business visibility, the ability to deploy capital at high rates of return, strong balance sheets and an attractive risk/reward. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Adviser actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The Adviser seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The Adviser generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long-term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation. Although consideration of ESG factors is incorporated into the investment process, it is only one of many tools the Adviser utilizes to make investment decisions.
The Fund may invest in foreign securities, which may include emerging market securities. Under normal market conditions, the Fund typically invests at least 40% of its total assets in the securities of issuers located outside of the United States, unless the Adviser determines, in its sole discretion, that conditions are not favorable. If the Adviser determines that conditions are not favorable, the Fund may invest under 40% of its total assets in the securities of issuers located outside the United States, provided that the Fund will not invest less than 30% of its total assets in such securities except for temporary defensive purposes. In addition, under normal market conditions, the Fund invests in the securities of issuers from at least three different countries, which may include the United States.
In addition to common stocks, the Fund may invest in other types of equity securities. The Fund may also invest in privately placed and restricted securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance.  The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees. The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free 1-800-869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
06/30/20
57.81%
Low Quarter
06/30/22
-36.62%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions, such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed countries. Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange rates.  Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of  the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward
exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Information Technology Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Information Technology Sector Risk. To the extent the Fund invests a substantial portion of its assets in the information technology sector, the value of Fund shares may be particularly impacted by events that adversely affect the information technology sector, such as rapid changes in technology product cycles, product obsolescence, government regulation, and competition, and may fluctuate more than that of a fund that does not invest significantly in companies in the technology sector.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Consumer Discretionary Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Consumer Discretionary Sector Risk. To the extent that the Fund invests a substantial portion of its assets in the consumer discretionary sector, the Fund will be particularly susceptible to the risks associated with companies operating in such sector. Companies in the consumer discretionary sector are subject to risks, including fluctuations in the performance of the overall domestic and international economy, shipment and supply chain disruptions, interest rate changes, currency exchange rates, increased competition and consumer confidence. Performance of such companies may also be adversely affected by factors such as reduced disposable household income, reduced consumer spending, and changing demographics and consumer tastes.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its
discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Small and Mid Cap Companies [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Small and Mid Cap Companies. Investments in small and mid cap companies may involve greater risks than investments in larger, more established companies. The securities issued by small and mid cap companies may be less liquid and such companies may have more limited markets, financial resources and product lines, and may lack the depth of management of larger companies.
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | MSCI All Country World Net Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 17.49% [19]
5 Years rr_AverageAnnualReturnYear05 10.06% [19]
10 Years rr_AverageAnnualReturnYear10 9.23% [19]
Since Inception rr_AverageAnnualReturnSinceInception 9.01% [19],[20]
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [21]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.60% [22]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.40% [23]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.40% [23]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.00% [23]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 404
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 728
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,645
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 404
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 728
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,645
Annual Return 2015 rr_AnnualReturn2015 3.85%
Annual Return 2016 rr_AnnualReturn2016 0.21%
Annual Return 2017 rr_AnnualReturn2017 41.56%
Annual Return 2018 rr_AnnualReturn2018 (5.75%)
Annual Return 2019 rr_AnnualReturn2019 31.49%
Annual Return 2020 rr_AnnualReturn2020 94.98%
Annual Return 2021 rr_AnnualReturn2021 (14.25%)
Annual Return 2022 rr_AnnualReturn2022 (57.65%)
Annual Return 2023 rr_AnnualReturn2023 50.84%
Annual Return 2024 rr_AnnualReturn2024 48.13%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 57.81%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (36.62%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 48.13%
5 Years rr_AverageAnnualReturnYear05 9.61%
10 Years rr_AverageAnnualReturnYear10 11.19%
Since Inception rr_AverageAnnualReturnSinceInception 11.61%
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 47.41% [24]
5 Years rr_AverageAnnualReturnYear05 7.04% [24]
10 Years rr_AverageAnnualReturnYear10 9.21% [24]
Since Inception rr_AverageAnnualReturnSinceInception 9.78% [24]
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 28.54%
5 Years rr_AverageAnnualReturnYear05 7.36%
10 Years rr_AverageAnnualReturnYear10 8.87%
Since Inception rr_AverageAnnualReturnSinceInception 9.39%
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [25]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [21]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.64% [22]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69% [23]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.37% [23]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.32% [23]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 652
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 995
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,389
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 652
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 995
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,362
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,389
1 Year rr_AverageAnnualReturnYear01 39.88%
5 Years rr_AverageAnnualReturnYear05 8.12%
10 Years rr_AverageAnnualReturnYear10 10.24%
Since Inception rr_AverageAnnualReturnSinceInception 10.84%
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Class L  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [21]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.52% [22]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.07% [23]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 1.22% [23]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.85% [23]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 188
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 834
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,298
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 188
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 834
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,504
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,298
1 Year rr_AverageAnnualReturnYear01 46.85%
5 Years rr_AverageAnnualReturnYear05 8.69%
10 Years rr_AverageAnnualReturnYear10 10.25%
Since Inception rr_AverageAnnualReturnSinceInception 10.69%
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [26]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [21]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.67% [22]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.47% [23]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.37% [23]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.10% [23]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 313
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 734
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,282
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,585
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 213
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 734
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,282
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,585
1 Year rr_AverageAnnualReturnYear01 45.49%
5 Years rr_AverageAnnualReturnYear05 8.45%
Since Inception rr_AverageAnnualReturnSinceInception 9.86% [27]
(MSIF - Counterpoint Global Portfolios) | (Global Insight Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [21]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 9.15% [22]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 9.95% [23]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 9.00% [23]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.95% [23]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,066
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,845
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 7,578
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,066
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,845
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 7,578
1 Year rr_AverageAnnualReturnYear01 48.11%
Since Inception rr_AverageAnnualReturnSinceInception (5.35%)
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Global Permanence Portfolio (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The
example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 62%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 62.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in equity securities of established companies located throughout the world, with capitalizations within the range of companies included in the MSCI All Country World Index.
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser typically invests in companies it believes have strong name recognition and sustainable competitive advantages with above average business visibility, the ability to deploy capital at high rates of return, strong balance sheets and an attractive risk/reward. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Fund will make long-term investments in companies globally that the Adviser believes have the most durable long-term competitive advantages. The Fund may also invest in more moderate growth companies, companies with lower earnings volatility and/or companies with some cyclicality in their end markets.
The Adviser actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The Adviser seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The Adviser generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long-term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation.  Although consideration of ESG factors is incorporated into the investment process, it is only one of many tools the Adviser utilizes to make investment decisions.
The Fund may invest in foreign securities, which may include emerging market securities. Under normal market conditions, the Fund typically invests at least 40% of its total assets in the securities of issuers located outside of the United States, unless the Adviser determines, in its sole discretion, that conditions are not favorable. If the Adviser determines that conditions are not favorable, the Fund may invest under 40% of its total assets in the securities of issuers located outside the United States, provided that the Fund will not invest less than 30% of its total assets in such securities except for temporary defensive purposes. In addition, under normal market conditions, the Fund invests in the securities of issuers from at least three different countries, which may include the United States.
In addition to common stocks, the Fund may invest in other types of equity securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s Class I shares’ performance from year to year and by showing how the Fund’s average annual returns for the past one and five year periods and since inception compare with those of a broad measure of market performance. The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees. The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free 1-800-869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year to year and by showing how the Fund’s average annual returns for the past one and five year periods and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
06/30/20
26.97%
Low Quarter
03/31/20
-17.69%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions, such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed countries. Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange
rates.  Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of  the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Small and Mid Cap Companies [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Small and Mid Cap Companies. Investments in small and mid cap companies may involve greater risks than investments in larger, more established companies. The securities issued by small and mid cap companies may be less liquid and such companies may have more limited markets, financial resources and product lines, and may lack the depth of management of larger companies.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Portfolio Turnover [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Portfolio Turnover. Consistent with its investment policies, the Fund will purchase and sell securities without regard to the effect on portfolio turnover. Higher portfolio turnover will cause the Fund to incur additional transaction costs.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Industrials Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Industrials Sector Risk. To the extent that the Fund invests significantly in the industrials sector, the Fund will be particularly susceptible to the risks associated with companies operating in this sector. For example, the value of securities issued by companies in the industrials sector may be adversely affected by changes in government regulations, domestic and world events and economic conditions. In addition, companies in the industrials sector may be adversely affected by, among other developments, environmental damages, product liability claims, commodity prices and exchange rates as well as changes in the supply of and demand for both their specific products or services and for industrials sector products in general.
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | MSCI All Country World Net Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 17.49% [28]
5 Years rr_AverageAnnualReturnYear05 10.06% [28]
Since Inception rr_AverageAnnualReturnSinceInception 10.52% [28],[29]
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [30]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 6.80% [31]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 7.60% [32]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 6.60% [32]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.00% [32]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,642
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,103
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 6,436
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,642
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,103
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 6,436
Annual Return 2020 rr_AnnualReturn2020 27.06%
Annual Return 2021 rr_AnnualReturn2021 19.73%
Annual Return 2022 rr_AnnualReturn2022 (19.88%)
Annual Return 2023 rr_AnnualReturn2023 20.92%
Annual Return 2024 rr_AnnualReturn2024 10.69%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.97%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.69%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
1 Year rr_AverageAnnualReturnYear01 10.69%
5 Years rr_AverageAnnualReturnYear05 10.28%
Since Inception rr_AverageAnnualReturnSinceInception 10.19%
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 5.49% [33]
5 Years rr_AverageAnnualReturnYear05 8.01% [33]
Since Inception rr_AverageAnnualReturnSinceInception 8.18% [33]
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 9.03%
5 Years rr_AverageAnnualReturnYear05 7.87%
Since Inception rr_AverageAnnualReturnSinceInception 7.88%
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [34]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [30]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 7.17% [31]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 8.22% [32]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 6.87% [32]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.35% [32]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 655
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,218
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,682
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 6,949
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 655
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,218
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,682
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 6,949
1 Year rr_AverageAnnualReturnYear01 4.55%
5 Years rr_AverageAnnualReturnYear05 8.71%
Since Inception rr_AverageAnnualReturnSinceInception 8.78%
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [35]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [30]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 7.86% [31]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 9.66% [32]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 7.56% [32]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.10% [32]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 313
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,109
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,833
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 7,302
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 213
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,109
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,833
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 7,302
1 Year rr_AverageAnnualReturnYear01 8.70%
5 Years rr_AverageAnnualReturnYear05 9.08%
Since Inception rr_AverageAnnualReturnSinceInception 9.01%
(MSIF - Counterpoint Global Portfolios) | (Global Permanence Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80% [30]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.64% [31]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 21.44% [32]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 20.49% [32]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.95% [32]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,855
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 6,480
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 10,078
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 3,855
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 6,480
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 10,078
1 Year rr_AverageAnnualReturnYear01 10.83%
5 Years rr_AverageAnnualReturnYear05 10.34%
Since Inception rr_AverageAnnualReturnSinceInception 10.26%
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Growth Portfolio (the “Fund”) seeks long-term capital appreciation by investing primarily in growth-oriented equity securities of large capitalization companies.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same. After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 39%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 39.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in established and emerging  companies, with capitalizations within the range of companies included in the Russell 1000® Growth Index. As of December 31, 2024, these market capitalizations ranged between $1.7 billion and $3.8 trillion.
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser typically invests in unique companies it believes have sustainable competitive advantages with above average business visibility, the ability to deploy capital at high rates of return, strong balance sheets and an attractive risk/reward. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Adviser actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The Adviser seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The Adviser generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long-term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation.  Although consideration of ESG factors is incorporated into the investment process, it is only one of many tools the Adviser utilizes to make investment decisions.
In addition to common stocks, the Fund may invest in other types of equity securities. The Fund may also invest in privately placed and restricted securities.
The Adviser may invest up to 25% of the Fund’s total assets in foreign securities, including emerging market securities and securities classified as American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), American Depositary Shares (“ADSs”) or Global Depositary Shares (“GDSs”), foreign U.S. dollar-denominated securities that are traded on a U.S. exchange or local shares of non-U.S. issuers.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance and one or more additional indexes. The
additional index(es) in the table provides a means to compare the Fund’s average annual total returns to a benchmark that the Adviser believes is representative of the Fund’s investment universe. The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees. The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class  C and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free 1-800-869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance and one or more additional indexes.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class  C and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
06/30/20
58.32%
Low Quarter
06/30/22
-41.20%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it
is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions, such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed countries. Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange rates.  Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of  the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and
there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Information Technology Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Information Technology Sector Risk. To the extent the Fund invests a substantial portion of its assets in the information technology sector, the value of Fund shares may be particularly impacted by events that adversely affect the information technology sector, such as rapid changes in technology product cycles, product obsolescence, government regulation, and competition, and may fluctuate more than that of a fund that does not invest significantly in companies in the technology sector.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Consumer Discretionary Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Consumer Discretionary Sector Risk. To the extent that the Fund invests a substantial portion of its assets in the consumer discretionary sector, the Fund will be particularly susceptible to the risks associated with companies operating in such sector. Companies in the consumer discretionary sector are subject to risks, including fluctuations in the performance of the overall domestic and international economy, shipment and supply chain disruptions, interest rate changes, currency exchange rates, increased competition and consumer confidence. Performance of such companies may also be adversely affected by factors such as reduced disposable household income, reduced consumer spending, and changing demographics and consumer tastes.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 33.36% [36]
5 Years rr_AverageAnnualReturnYear05 18.96% [36]
10 Years rr_AverageAnnualReturnYear10 16.78% [36]
Since Inception rr_AverageAnnualReturnSinceInception 11.08% [36],[37]
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Russell 1000® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 24.51% [38]
5 Years rr_AverageAnnualReturnYear05 14.28% [38]
10 Years rr_AverageAnnualReturnYear10 12.87% [38]
Since Inception rr_AverageAnnualReturnSinceInception 10.73% [37],[38]
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [39]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20% [40]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 63
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 199
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 346
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 774
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 63
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 199
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 346
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 774
Annual Return 2015 rr_AnnualReturn2015 11.91%
Annual Return 2016 rr_AnnualReturn2016 (1.91%)
Annual Return 2017 rr_AnnualReturn2017 43.83%
Annual Return 2018 rr_AnnualReturn2018 7.66%
Annual Return 2019 rr_AnnualReturn2019 23.16%
Annual Return 2020 rr_AnnualReturn2020 115.57%
Annual Return 2021 rr_AnnualReturn2021 0.43%
Annual Return 2022 rr_AnnualReturn2022 (60.34%)
Annual Return 2023 rr_AnnualReturn2023 50.25%
Annual Return 2024 rr_AnnualReturn2024 46.63%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 58.32%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (41.20%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 46.63%
5 Years rr_AverageAnnualReturnYear05 13.60%
10 Years rr_AverageAnnualReturnYear10 14.76%
Since Inception rr_AverageAnnualReturnSinceInception 11.64%
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 46.33% [41]
5 Years rr_AverageAnnualReturnYear05 11.09% [41]
10 Years rr_AverageAnnualReturnYear10 11.97% [41]
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 27.62%
5 Years rr_AverageAnnualReturnYear05 10.57%
10 Years rr_AverageAnnualReturnYear10 11.48%
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [42]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [39]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20% [40]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.87%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 609
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 788
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 982
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,541
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 609
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 788
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 982
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,541
1 Year rr_AverageAnnualReturnYear01 38.58%
5 Years rr_AverageAnnualReturnYear05 12.10%
10 Years rr_AverageAnnualReturnYear10 13.83%
Since Inception rr_AverageAnnualReturnSinceInception 10.70%
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Class L  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [39]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20% [40]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 139
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 434
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 750
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,646
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 139
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 434
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 750
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,646
1 Year rr_AverageAnnualReturnYear01 45.52%
5 Years rr_AverageAnnualReturnYear05 12.76%
10 Years rr_AverageAnnualReturnYear10 13.87%
Since Inception rr_AverageAnnualReturnSinceInception 14.35%
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [43]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [39]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20% [40]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.62%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 265
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 511
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 881
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,721
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 165
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 511
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 881
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,721
1 Year rr_AverageAnnualReturnYear01 44.20%
5 Years rr_AverageAnnualReturnYear05 12.48%
Since Inception rr_AverageAnnualReturnSinceInception 13.36% [44]
(MSIF - Counterpoint Global Portfolios) | (Growth Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [39]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10% [40]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.52%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 53
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 167
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 291
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 653
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 53
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 167
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 291
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 653
1 Year rr_AverageAnnualReturnYear01 46.76%
5 Years rr_AverageAnnualReturnYear05 13.70%
10 Years rr_AverageAnnualReturnYear10 14.85%
Since Inception rr_AverageAnnualReturnSinceInception 15.20%
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Inception Portfolio (the “Fund”) seeks long-term capital appreciation by investing primarily in growth-oriented equity securities of small capitalization companies.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 100%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 100.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in established and emerging companies with capitalizations within the range of companies included in the Russell 2000® Growth Index. As of December 31, 2024, these market capitalizations ranged between $8.2 million and $14.8 billion.
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser typically invests in unique companies it believes have sustainable competitive advantages with above average business visibility, the ability to deploy capital at high rates of return, strong balance sheets and an attractive risk/reward. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Adviser actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The Adviser seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The Adviser generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long-term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation. Although consideration of ESG factors is incorporated into the investment process, it is only one of many tools the Adviser utilizes to make investment decisions.
In addition to common stocks, the Fund may invest in other types of equity securities. The Fund may also invest in privately placed and restricted securities.
The Adviser may invest up to 25% of the Fund’s total assets in foreign securities, including emerging market securities and securities classified as American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), American Depositary Shares (“ADSs”)
or Global Depositary Shares (“GDSs”), foreign U.S. dollar-denominated securities that are traded on a U.S. exchange or local shares of non-U.S. issuers.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance and one or more additional indexes. The additional index(es) in the table provides a means to compare the Fund’s average annual total returns to a benchmark that the Adviser believes is representative of the Fund’s investment universe. The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees. The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class  C and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free 1-800-869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and ten year periods and since inception compare with those of a broad measure of market performance and one or more additional indexes.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class  C and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
06/30/20
72.82%
Low Quarter
06/30/22
-36.24%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions, such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the  U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed countries.  Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its
ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange rates. Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the
Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Information Technology Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Information Technology Sector Risk. To the extent the Fund invests a substantial portion of its assets in the information technology sector, the value of Fund shares may be particularly impacted by events that adversely affect the information technology sector, such as rapid changes in technology product cycles, product obsolescence, government regulation, and competition, and may fluctuate more than that of a fund that does not invest significantly in companies in the technology sector.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Consumer Discretionary Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Consumer Discretionary Sector Risk. To the extent that the Fund invests a substantial portion of its assets in the consumer discretionary sector, the Fund will be particularly susceptible to the risks associated with companies operating in such sector. Companies in the consumer discretionary sector are subject to risks, including fluctuations in the performance of the overall domestic and international economy, shipment and supply chain disruptions, interest rate changes, currency exchange rates, increased competition and consumer confidence. Performance of such companies may also be adversely affected by factors such as reduced disposable household income, reduced consumer spending, and changing demographics and consumer tastes.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Portfolio Turnover [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Portfolio Turnover. Consistent with its investment policies, the Fund will purchase and sell securities without regard to the effect on portfolio turnover. Higher portfolio turnover will cause the Fund to incur additional transaction costs.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Small Cap Companies [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Small Cap Companies. Investments in small cap companies may involve greater risks than investments in larger, more established companies. The securities issued by small cap companies may be less liquid and such companies may have more limited markets, financial resources and product lines, and may lack the depth of management of larger companies.
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 15.15% [45]
5 Years rr_AverageAnnualReturnYear05 6.86% [45]
10 Years rr_AverageAnnualReturnYear10 8.09% [45]
Since Inception rr_AverageAnnualReturnSinceInception 7.99% [45],[46]
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 23.81% [47]
5 Years rr_AverageAnnualReturnYear05 13.86% [47]
10 Years rr_AverageAnnualReturnYear10 12.55% [47]
Since Inception rr_AverageAnnualReturnSinceInception 10.62% [46],[47]
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.92% [48]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21% [49]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.13% [50]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.13% [50]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.00% [50]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 346
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 610
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,363
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 346
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 610
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,363
Annual Return 2015 rr_AnnualReturn2015 (9.58%)
Annual Return 2016 rr_AnnualReturn2016 (0.35%)
Annual Return 2017 rr_AnnualReturn2017 21.87%
Annual Return 2018 rr_AnnualReturn2018 0.29%
Annual Return 2019 rr_AnnualReturn2019 37.11%
Annual Return 2020 rr_AnnualReturn2020 150.57%
Annual Return 2021 rr_AnnualReturn2021 (3.33%)
Annual Return 2022 rr_AnnualReturn2022 (59.42%)
Annual Return 2023 rr_AnnualReturn2023 54.44%
Annual Return 2024 rr_AnnualReturn2024 29.64%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 72.82%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (36.24%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 29.64%
5 Years rr_AverageAnnualReturnYear05 14.50%
10 Years rr_AverageAnnualReturnYear10 11.51%
Since Inception rr_AverageAnnualReturnSinceInception 11.47%
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 29.17% [51]
5 Years rr_AverageAnnualReturnYear05 11.90% [51]
10 Years rr_AverageAnnualReturnYear10 8.01% [51]
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 17.58%
5 Years rr_AverageAnnualReturnYear05 10.94%
10 Years rr_AverageAnnualReturnYear10 7.95%
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [52]
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.92% [48]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29% [49]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.46% [50]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.11% [50]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.35% [50]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 655
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 952
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,271
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,171
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 655
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 952
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,271
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,171
1 Year rr_AverageAnnualReturnYear01 22.29%
5 Years rr_AverageAnnualReturnYear05 12.92%
10 Years rr_AverageAnnualReturnYear10 10.56%
Since Inception rr_AverageAnnualReturnSinceInception 10.57%
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Class L  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.92% [48]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.84% [49]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.51% [50]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.66% [50]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.85% [50]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 188
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 719
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,276
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,796
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 188
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 719
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,276
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,796
1 Year rr_AverageAnnualReturnYear01 28.33%
5 Years rr_AverageAnnualReturnYear05 13.47%
10 Years rr_AverageAnnualReturnYear10 10.54%
Since Inception rr_AverageAnnualReturnSinceInception 11.94%
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [53]
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.92% [48]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36% [49]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.28% [50]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.18% [50]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.10% [50]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 313
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 695
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,204
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,395
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 213
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 695
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,204
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,395
1 Year rr_AverageAnnualReturnYear01 27.06%
5 Years rr_AverageAnnualReturnYear05 13.24%
Since Inception rr_AverageAnnualReturnSinceInception 13.50%
(MSIF - Counterpoint Global Portfolios) | (Inception Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption 2.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.92% [48]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21% [49]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.13% [50]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.20% [50]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.93% [50]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 95
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 339
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 603
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,357
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 95
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 339
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 603
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,357
1 Year rr_AverageAnnualReturnYear01 29.54%
5 Years rr_AverageAnnualReturnYear05 14.55%
10 Years rr_AverageAnnualReturnYear10 11.57%
Since Inception rr_AverageAnnualReturnSinceInception 10.68%
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Permanence Portfolio (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The
example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 74%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 74.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in equity securities of established companies located in the United States, with capitalizations within the range of companies included in the S&P 500® Index.  
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser typically invests in companies it believes have strong name recognition and sustainable competitive advantages with above average business visibility, the ability to deploy capital at high rates of return, strong balance sheets and an attractive risk/reward. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Fund will make long-term investments in companies that the Adviser believes have the most durable long-term competitive advantages.  The Fund may also invest in more moderate growth companies, companies with lower earnings volatility and/or companies with some cyclicality in their end markets.  
The Adviser actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The Adviser seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The Adviser generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long-term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation.  Although consideration of ESG factors is incorporated into the investment process, it is only one of many tools the Adviser utilizes to make investment decisions.
The Fund may invest in foreign securities, which may include emerging market securities.  
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one year period and since inception compare with those of a broad measure of market performance. The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees. The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free 1-800-869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one year period and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
03/31/23
14.96%
Low Quarter
06/30/22
-15.49%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it
is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions, such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed countries.  Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange rates. Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Information Technology Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Information Technology Sector Risk. To the extent the Fund invests a substantial portion of its assets in the information technology sector, the value of Fund shares may be particularly impacted by events that adversely affect the information technology sector, such as rapid changes in technology product cycles, product obsolescence, government regulation, and competition, and may fluctuate more than that of a fund that does not invest significantly in companies in the technology sector.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Consumer Discretionary Sector Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Consumer Discretionary Sector Risk. To the extent that the Fund invests a substantial portion of its assets in the consumer discretionary sector, the Fund will be particularly susceptible to the risks associated with companies operating in such sector. Companies in the consumer discretionary sector are subject to risks, including fluctuations in the performance of the overall domestic and international economy, shipment and supply chain disruptions, interest rate changes, currency exchange rates, increased competition and consumer confidence. Performance of such companies may also be adversely affected by factors such as reduced disposable household income, reduced consumer spending, and changing demographics and consumer tastes.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Portfolio Turnover [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Portfolio Turnover. Consistent with its investment policies, the Fund will purchase and sell securities without regard to the effect on portfolio turnover. Higher portfolio turnover will cause the Fund to incur additional transaction costs.
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 25.02% [54]
Since Inception rr_AverageAnnualReturnSinceInception 20.75% [54],[55]
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 6.51% [57]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 7.16% [58]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 6.31% [58]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.85% [58]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,546
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,943
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 6,180
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 87
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,546
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 2,943
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 6,180
Annual Return 2021 rr_AnnualReturn2021 16.85%
Annual Return 2022 rr_AnnualReturn2022 (20.55%)
Annual Return 2023 rr_AnnualReturn2023 26.44%
Annual Return 2024 rr_AnnualReturn2024 13.78%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.96%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2023
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.49%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 13.78%
Since Inception rr_AverageAnnualReturnSinceInception 16.62%
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 9.67% [59]
Since Inception rr_AverageAnnualReturnSinceInception 13.15% [59]
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 9.83%
Since Inception rr_AverageAnnualReturnSinceInception 12.34%
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [60]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 7.05% [57]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 7.95% [58]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 6.75% [58]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.20% [58]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 641
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,159
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,589
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 6,810
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 641
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,159
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,589
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 6,810
1 Year rr_AverageAnnualReturnYear01 7.42%
Since Inception rr_AverageAnnualReturnSinceInception 14.92%
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [61]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 12.24% [57]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 13.89% [58]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 11.94% [58]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.95% [58]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 298
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,812
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,982
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,394
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 198
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,812
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,982
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,394
1 Year rr_AverageAnnualReturnYear01 11.58%
Since Inception rr_AverageAnnualReturnSinceInception 15.33%
(MSIF - Counterpoint Global Portfolios) | (Permanence Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 9.85% [57]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 10.50% [58]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 9.70% [58]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.80% [58]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,151
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,999
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 7,800
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,151
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,999
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 7,800
1 Year rr_AverageAnnualReturnYear01 13.90%
Since Inception rr_AverageAnnualReturnSinceInception 16.69%
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Vitality Portfolio (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 79 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus.
Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction, amounts to $50,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees  (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses  (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The example assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 19.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Adviser seeks to achieve the Fund’s investment objective by investing primarily in securities of companies located in the United States that are principally engaged in the discovery, development, production, or distribution of products or services related to advances in healthcare. These companies include, but are not limited to, biotechnology, pharmaceuticals, medical equipment and supplies, healthcare technology, healthcare providers and services, and life sciences tools and services. The Fund may also allocate to industries related to the healthcare industry, but are not primarily engaged in the scientific advancement of healthcare. The allocation among these areas will vary depending on the relative potential the Adviser sees within each area and the outlook for the overall healthcare sector.  
The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. In selecting securities for investment, the Adviser typically invests in unique companies it believes have sustainable competitive advantages, strong research and development and productive new product flow, financial strength, and an attractive risk/reward profile. The Fund generally seeks investments in companies that are developing new and effective medicines, enabling novel and more efficient research and development efforts, as well as companies whose business models reduce costs or improve quality in healthcare systems. The Adviser typically focuses a significant portion of the Fund’s investments in a limited number of issuers, which may be in the same industry, sector or geographic region.
The Adviser actively integrates sustainability into the investment process by using environmental, social and governance (“ESG”) factors as a lens for additional fundamental research, which can contribute to investment decision-making. The Adviser seeks to understand how environmental and social initiatives within companies can create value by strengthening durable competitive advantages, creating growth opportunities, driving profitability and/or aligning with secular growth trends. The Adviser generally engages with company management teams to discuss their ESG practices, with the aim of identifying how sustainability themes present opportunities and risks that can be material to the value of the security over the long-term. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation.  Although consideration of ESG factors is incorporated into the investment process, it is only one of many tools the Adviser utilizes to make investment decisions.
The Fund has a fundamental policy (i.e., one that cannot be changed without shareholder approval) of investing 25% or more of its total assets in the group of industries comprising the healthcare sector. Companies in the healthcare sector include biotechnology companies, pharmaceutical companies, medical equipment and supplies, healthcare technology, healthcare providers and services, and life sciences tools and services. Because the Fund is concentrated in the healthcare sector, it is less diversified than stock funds that invest in a broader range of industries and, therefore, the Fund could experience significant volatility.
The Fund will invest primarily in equity securities. The Fund may also invest in privately placed and restricted securities and special purpose acquisition companies (“SPACs”).
The Adviser may invest up to 25% of the Fund’s total assets in foreign securities, including emerging market securities and securities classified as American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), American Depositary Shares (“ADSs”)
or Global Depositary Shares (“GDSs”), foreign U.S. dollar-denominated securities that are traded on a U.S. exchange or local shares of non-U.S. issuers.
The equity securities in which the Fund primarily invests include common and preferred stocks, convertible securities and equity-linked securities, rights, warrants, depositary receipts, limited partnership interests, exchange-traded funds (“ETFs”) and open-end and closed-end investment companies (including those which may be managed by the Adviser or its affiliates) and initial public offerings (“IPOs”).
The Fund may use certain derivatives for the purposes of hedging, risk management, portfolio management or to earn income.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one year period and since inception compare with those of a broad measure of market performance and one or more additional indexes. The additional index(es) in the table provides a means to compare the Fund’s average annual total returns to a benchmark that the Adviser believes is representative of the Fund’s investment universe. The performance of the other classes, which is shown in the table below, will differ because the classes have different ongoing fees. The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted). The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at  www.morganstanley.com/im or by calling toll-free 1-800-869-6397.
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 Fund by showing changes in the Fund’s Class I shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one year period and since inception compare with those of a broad measure of market performance and one or more additional indexes.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress   www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s returns in the table include the maximum applicable sales charge for Class A and Class C and assume you sold your shares at the end of each period (unless otherwise noted).
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 Fund 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 Fund’s other classes will vary from Class I 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 Fund shares been sold at the end of the relevant periods, as applicable.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
09/30/24
8.42%
Low Quarter
06/30/22
-24.06%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the calendar periods ended  December 31, 2024)
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 Fund’s other classes will vary from Class I 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 Fund 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 Fund shares been sold at the end of the relevant periods, as applicable.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. U.S. and foreign stock markets, and equity securities of individual issuers, have experienced periods of substantial price volatility in the past and it is possible that they will do so again in the future. The prices of equity securities fluctuate, sometimes rapidly or widely, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political and public health conditions.  During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities are subject to heightened risks.
 
The value of equity securities declines in response to perceived or actual adverse changes in the economy, economic outlook or financial markets; deterioration in investor sentiment; inflation, interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; unexpected trading activity among retail investors; and other factors. Market conditions affect certain types of equity securities to a greater extent than other types of equity securities. If the stock market declines, the value of the Fund’s equity securities will also likely decline, which will result in a decrease in the value of your investment in the Fund. Although prices can rebound, there is no assurance that prices of the Fund’s equity securities will return to previous levels.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Foreign and Emerging Market Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign and Emerging Market Securities. Investments in foreign markets entail special risks, such as currency, political (including geopolitical), economic and market risks and heightened risks, that may result in losses to the Fund. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs and risks, decreased market liquidity and less government and exchange regulation associated with investments in foreign markets. In addition, investments in certain foreign markets that have historically been considered stable may become more volatile and subject to increased risk due to developments and changing conditions in such markets. Moreover, the growing  interconnectivity of global economies and financial markets has increased the probability that adverse developments and conditions in one country or region will affect the stability of economies and financial markets in other countries or regions. Certain foreign markets may rely heavily on particular industries or foreign capital and are more vulnerable to diplomatic developments (including regional and global, military or other conflicts), the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers (including tariffs) and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental interventions or other actions, such as the imposition of capital controls, nationalization of companies or industries, expropriation of assets or the imposition of punitive taxes. The governments of certain countries may prohibit or impose substantial restrictions on foreign investing in their capital markets or in certain sectors or industries. In addition, a foreign government may limit or cause delay in the convertibility or repatriation of its currency which would adversely affect the U.S. dollar value and/or liquidity of investments denominated in that currency. Certain foreign investments may become less liquid and decline in value in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market, economic, political and social turmoil. When the Fund holds illiquid investments, its portfolio may be harder to value. The risks of investing in emerging market countries are greater than the risks associated with
investments in foreign developed countries. Emerging market countries may be subject to increased potential for market manipulation and to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. In addition, the Fund is limited in its ability to exercise its legal rights or enforce a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular, in emerging market countries. In addition, the Fund’s investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of those investments will fluctuate with U.S. dollar exchange rates.  Economic sanctions or other similar measures may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar measures could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities (in the sanctioned country and other markets), negatively impact the value or liquidity of  the Fund’s investments, significantly delay or prevent the settlement of the Fund’s securities transactions, force the Fund to sell or otherwise dispose of investments at inopportune times or prices, or impair the Fund’s ability to meet its investment objective or invest in accordance with its investment strategies.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Foreign Currency Forward Exchange Contracts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Foreign Currency Forward Exchange Contracts. To the extent the Fund seeks to hedge its foreign currency exposure by the use of foreign currency forward exchange contracts, the precise matching of the foreign currency forward exchange contract amounts and the value of the securities involved will not generally be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date on which the contract is entered into and the date it matures. There is additional risk that such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken and that foreign currency forward exchange contracts create exposure to currencies in which the Fund’s securities are not denominated. The use of foreign currency forward exchange contracts involves the risks associated with derivatives and the risk of loss from the insolvency or bankruptcy of the counterparty to the contract or the failure of the counterparty to make payments or otherwise comply with the terms of the contract.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Liquidity. The Fund may make investments that are less liquid, illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities.  If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value and may be unable to sell the security at all.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Private Placements and Restricted Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Private Placements and Restricted Securities. The Fund’s investments may include privately placed and restricted securities, which are generally subject to resale or transfer restrictions or prohibitions. Private placements and restricted securities may not be listed on an exchange and may have no active trading market. The Fund may be unable to dispose of privately placed and restricted securities promptly or may be able to sell privately placed and restricted securities only at disadvantageous times or prices, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer. There is no assurance that a liquid market will exist for privately placed and restricted securities and these securities could have the effect of increasing the level of Fund illiquidity. In addition, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Restricted securities, including privately placed securities, may be difficult to value and may experience significant price volatility, and there is typically less information available about issuers of private placements and restricted securities and there is no assurance that the information obtained by the Adviser is reliable. Private placements and restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the Fund.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Focused Investing [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Focused Investing. Although the Fund is a diversified investment company under the Investment Company Act of 1940 (the “1940 Act”), the Fund typically invests a significant portion of its portfolio in a limited number of issuers, which may be in the same industry, sector or geographic region. As a result, the Fund will be more susceptible to risks associated with, and negative events affecting those issuers, industries, sectors or geographic regions, and a decline in the value of a particular instrument may cause the Fund’s overall value to be more volatile and decline to a greater degree than if the Fund were invested more widely.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which change due to economic, geopolitical and other events that affect the U.S. and global markets generally, as well as those that affect or are perceived or expected to affect particular regions, countries, industries, companies, issuers, sectors, asset classes or governments. These types of events may be sudden and unexpected, and could adversely affect the value (or income generated by) and liquidity of the Fund’s investments, which may in turn impact the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters or events, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes, supply chain disruptions and the imposition of tariffs, trade barriers and other protectionist or retaliatory measures)  adversely interrupt or otherwise affect the global economy and financial markets. It is difficult to predict when events affecting the  U.S. or global financial markets or economies may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These types of events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance or value of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Active Management Risk. In pursuing the Fund’s investment objective, the Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | ETFs [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
ETFs. Shares of ETFs have many of the same risks as direct investments in common stocks or bonds and their market value may differ from their NAV because the supply and demand in the market for ETF shares at any point in time is not always identical to the supply and demand in the market for the underlying securities. As a shareholder in an ETF, the Fund would bear its ratable share of that entity’s expenses while continuing to pay its own investment management fees and other expenses. As a result, the Fund and its shareholders will, in effect, be absorbing fees at two levels. Furthermore, disruptions in the markets for the securities underlying ETFs purchased or sold by the Fund could result in losses on the Fund’s investment in ETFs.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Small and Mid Cap Companies [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Small and Mid Cap Companies. Investments in small and mid cap companies may involve greater risks than investments in larger, more established companies. The securities issued by small and mid cap companies may be less liquid and such companies may have more limited markets, financial resources and product lines, and may lack the depth of management of larger companies.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Convertible Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Convertible Securities. A convertible security is a bond, debenture, note, preferred stock, right, warrant or other security that may be converted into or exchanged for a prescribed amount of common stock or other security of the same or a different issuer or into cash within a particular period of time at a specified price or formula. To the extent that the Fund invests in convertible securities, and the convertible security’s investment value is greater than its conversion value, its price will be likely to increase when interest rates fall and decrease when interest rates rise. If the conversion value exceeds the investment value, the price of the convertible security will tend to fluctuate directly with the price of the underlying security.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Preferred Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Preferred Securities. Preferred stock is issued with a fixed par value and pays dividends based on a percentage of that par value at a fixed rate. As with fixed-income securities, which also make fixed payments, the market value of preferred stock is sensitive to changes in interest rates. Preferred stock generally decreases in value if interest rates rise and increases in value if interest rates fall.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Healthcare Concentration Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Healthcare Concentration Risk. The Fund will concentrate its investments in the group of industries comprising the healthcare sector and, from time to time, may concentrate its investments in one or more individual industries in the group of industries comprising the healthcare sector. By concentrating its investments in the group of industries comprising the healthcare sector, the Fund has greater exposure to the potential adverse economic, regulatory, political and other changes affecting companies operating within such sector. The profitability of companies in the healthcare sector may be adversely affected by, among other things, extensive government regulation, restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure, costs associated with obtaining and protecting patents, product liability and other claims, an increased emphasis on outpatient services, changes in the demand for medical products and services, a limited number of products, industry innovation, changes in technologies and other market, economic and public health developments. To the extent that the Fund concentrates its investments in one or more individual industries comprising the healthcare sector (such as, but not limited to, biotechnology, pharmaceuticals, medical equipment and supplies, healthcare technology, healthcare providers and services, and life sciences tools and services companies), the Fund will be particularly susceptible to the risks associated with such industry or industries.
 
Biotechnology, healthcare technology, pharmaceutical and life sciences tools and services companies are heavily dependent on patents and intellectual property rights and the loss or impairment of such rights will negatively impact a company’s profitability. In addition, these companies are subject to the risk of new technologies and competition, large expenditures on research and development of products and services that may not prove commercially successful, regulations and restrictions imposed by the Food and Drug Administration, the Environmental Protection Agency, state and local governments and foreign regulatory authorities, and thin capitalization. Medical equipment and supply companies are heavily dependent on patent protection and may be subject to extensive litigation based on product liability and similar claims. In addition, medical equipment companies are subject to the risk that products can become obsolete due to industry innovation, changes in technology or other market developments, and may not receive necessary regulatory approvals to become commercially viable. Healthcare providers and services companies are particularly subject to certain risks, including restrictions on government reimbursement for medical expenses, an increased emphasis on outpatient services, rising costs of medical products and public health conditions.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | IPOs [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
IPOs. The Fund may purchase shares issued as part of, or a short period after, a company’s IPO, and may at times dispose of those shares shortly after their acquisition. The Fund’s purchase of shares issued in IPOs exposes it to the risks associated with companies that have little operating history as public companies. The market for IPO issuers may be volatile, and share prices of newly-public companies have fluctuated significantly over short periods of time. IPOs may produce high, double-digit returns. Such returns are highly unusual and may not be sustainable.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | SPACs [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
SPACs. A SPAC  is a publicly traded company that raises investment capital for the purpose of acquiring or merging with an existing company. An investment in a SPAC is subject to the risks that any proposed acquisition or merger may not obtain the requisite approval of SPAC shareholders, may require governmental or other approvals that it fails to obtain or that an acquisition or merger, once effected, may prove unsuccessful and lose value. In addition, among other conflicts of interest, the economic interests of the management, directors, officers and related parties of a SPAC can differ from the economic interests of public shareholders, which may lead to conflicts as they evaluate, negotiate and recommend business combination transactions to shareholders. An investment in a SPAC is also subject to the risk that a significant portion of the funds raised by the SPAC may be expended during the search for a target acquisition or merger.  
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Derivatives [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Derivatives. Derivatives and other similar instruments that create synthetic exposure often are subject to risks similar to those of the underlying asset or instrument, including market risk, and may be subject to additional risks, including imperfect correlation between the value of the derivative and the underlying asset, risks of default by the counterparty to certain transactions, magnification of losses incurred due to changes in the market value of the securities, instruments, indices or interest rates to which the derivative instrument relates, risks that the transactions may not be liquid, risks arising from margin and payment requirements, risks arising from mispricing or valuation complexity and operational and legal risks. Certain derivative transactions may give rise to a form of leverage. Leverage magnifies the potential for gain and the risk of loss.
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 23.81% [62]
Since Inception rr_AverageAnnualReturnSinceInception 8.01% [62],[63]
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Russell 3000® Health Care Net Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 3.03% [64]
Since Inception rr_AverageAnnualReturnSinceInception (0.45%) [63],[64]
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 10.69%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 11.44% [65]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 10.49% [65]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.95% [65]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 2,327
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,279
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,159
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 2,327
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,279
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,159
Annual Return 2022 rr_AnnualReturn2022 (39.84%)
Annual Return 2023 rr_AnnualReturn2023 9.25%
Annual Return 2024 rr_AnnualReturn2024 (8.87%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.42%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2024
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.06%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 (8.87%)
Since Inception rr_AverageAnnualReturnSinceInception (15.71%)
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (8.88%) [66]
Since Inception rr_AverageAnnualReturnSinceInception (16.04%) [66]
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (5.24%)
Since Inception rr_AverageAnnualReturnSinceInception (11.56%)
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none [67]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 16.78%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 17.78% [65]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 16.48% [65]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.30% [65]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 650
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,712
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 6,041
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 9,709
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 650
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 3,712
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 6,041
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 9,709
1 Year rr_AverageAnnualReturnYear01 (13.86%)
Since Inception rr_AverageAnnualReturnSinceInception (17.46%)
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [68]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 17.35%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 19.10% [65]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 17.05% [65]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.05% [65]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 308
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,606
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 6,113
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 9,804
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 208
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 3,606
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 6,113
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 9,804
1 Year rr_AverageAnnualReturnYear01 (10.71%)
Since Inception rr_AverageAnnualReturnSinceInception (16.59%)
(MSIF - Counterpoint Global Portfolios) | (Vitality Portfolio) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 17.11%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 17.86% [65]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 16.96% [65]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.90% [65]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 3,348
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 5,820
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 9,700
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 3,348
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 5,820
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 9,700
1 Year rr_AverageAnnualReturnYear01 (8.81%)
Since Inception rr_AverageAnnualReturnSinceInception (15.63%)
[1]
4 The Standard & Poor’s 500® Index (S&P 500® Index) measures the performance of the large cap segment of the U.S. equities market, covering approximately 80% of the U.S. equities market. The S&P 500® Index includes 500 leading companies in leading industries of the U.S. economy. It is not possible to invest directly in an index.
[2]
5 Since Inception reflects the inception date of Class I.
[3]
6 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.
[4]
1 “Advisory Fee” includes the management fee of a wholly-owned subsidiary of the Fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive or credit a portion of the advisory fee in an amount equal to the management fee paid to the Adviser by the Subsidiary.
[5]
3 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
[6]
4 The Adviser has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.85% for Class I, 1.20% for Class A, 0.99% for Class L, 1.95% for Class C and 0.81% for Class R6. The fee waivers and/or expense reimbursements will continue  for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.  
[7]
1 Performance shown for the Fund’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.
[8]
2 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[9]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[10]
2 The Fund’s “Distributor,” Morgan Stanley Distribution, Inc., has agreed to waive the 12b-1 fee on Class L shares of the Fund to the extent it exceeds 0.04% of the average daily net assets of such shares on an annualized basis. This waiver will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of the Company acts to discontinue all or a portion of such waiver when it deems such action is appropriate.
[11]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
[12]
3 Class C shares will generally automatically convert to Class A shares eight years after the end of the calendar month in which the shares were purchased. Performance for periods greater than eight years reflects this conversion.
[13]
2 The MSCI All Country World Net Index  is a free float-adjusted market capitalization weighted index designed to measure the equity market performance of developed and emerging markets. The term “free float” represents the portion of shares outstanding that are deemed to be available for purchase in the public equity markets by investors. The performance of the index is listed in U.S. dollars and assumes reinvestment of net dividends. Net total return indices reinvest dividends after the deduction of withholding taxes, using (for international indices) a tax rate applicable to non-resident institutional investors who do not benefit from double taxation treaties. It is not possible to invest directly in an index.
[14]
3 Since Inception reflects the inception date of the Fund.
[15]
1 The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 2.10% for Class C and 0.95% for Class R6. The fee waivers and/or expense reimbursements will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[16]
1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[17]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[18]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
[19]
3 The MSCI All Country World Net Index  is a free float-adjusted market capitalization weighted index designed to measure the equity market performance of developed and emerging markets. The term “free float” represents the portion of shares outstanding that are deemed to be available for purchase in the public equity markets by investors. The performance of the index is listed in U.S. dollars and assumes reinvestment of net dividends. Net total return indices reinvest dividends after the deduction of withholding taxes, using (for international indices) a tax rate applicable to non-resident institutional investors who do not benefit from double taxation treaties. It is not possible to invest directly in an index.
[20]
4 Since Inception reflects the inception date of Class I.
[21]
1 “Advisory Fee” includes the management fee of a wholly-owned subsidiary of the Fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive or credit a portion of the advisory fee in an amount equal to the management fee paid to the Adviser by the Subsidiary.
[22]
2 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
[23]
3 The Adviser has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.32% for Class A, 1.85% for Class L,  2.10% for Class C and 0.95% for Class R6. The fee waivers and/or expense reimbursements will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[24]
1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[25]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[26]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
[27]
2 Class C shares will generally automatically convert to Class A shares eight years after the end of the calendar month in which the shares were purchased. Performance for periods greater than eight years reflects this conversion.
[28]
2 The MSCI All Country World Net Index is a free float-adjusted market capitalization weighted index designed to measure the equity market performance of developed and emerging markets. The term “free float” represents the portion of shares outstanding that are deemed to be available for purchase in the public equity markets by investors. The performance of the index is listed in U.S. dollars and assumes reinvestment of net dividends. Net total return indices reinvest dividends after the deduction of withholding taxes, using (for international indices) a tax rate applicable to non-resident institutional investors who do not benefit from double taxation treaties. It is not possible to invest directly in an index.
[29]
3 Since Inception reflects the inception date of the Fund.
[30]
1 “Advisory Fee” includes the management fee of a wholly-owned subsidiary of the Fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive or credit a portion of the advisory fee in an amount equal to the management fee paid to the Adviser by the Subsidiary.
[31]
2 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
[32]
3 The Adviser has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 2.10% for Class C and 0.95% for Class R6. The fee waivers and/or expense reimbursements will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[33]
1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[34]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[35]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
[36]
5 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. It is not possible to invest directly in an index.
[37]
4 Since Inception reflects the inception date of Class I.
[38]
3 The Russell 1000® Index measures the performance of the large-cap segment of the U.S. equity universe. It is a subset of the Russell 3000® Index and includes approximately 1,000 of the largest securities based on a combination of their market capitalization and current index membership. The Russell 3000® Index measures the performance of the largest 3,000 U.S. companies representing approximately 98% of the investable  U.S. equity market. It is not possible to invest directly in an index.
[39]
1 “Advisory Fee” includes the management fee of a wholly-owned subsidiary of the Fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive or credit a portion of the advisory fee in an amount equal to the management fee paid to the Adviser by the Subsidiary.
[40]
2 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
[41]
1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[42]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[43]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
[44]
2 Class C shares will generally automatically convert to Class A shares eight years after the end of the calendar month in which the shares were purchased. Performance for periods greater than eight years reflects this conversion.
[45]
4 The Russell 2000® Growth Index measures the performance of the small-cap growth segment of the U.S. equity universe. It includes those Russell 2000® Index companies with higher price-to-book ratios and higher forecasted growth values. The Russell 2000® Index is a subset of the Russell 3000® Index representing approximately 10% of the total market capitalization of that index. It includes approximately 2,000 of the smallest securities based on a combination of their market capitalization and current index membership. It is not possible to invest directly in an index.
[46]
3 Since Inception reflects the inception date of Class I.
[47]
2 The Russell 3000® Index measures the performance of the largest 3000 U.S. companies representing approximately 98% of the investable U.S. equity market. The Russell 3000® Index is constructed to provide a comprehensive, unbiased and stable barometer of the broad market and is completely reconstituted annually to ensure new and growing equities are included. It is not possible to invest directly in an index.
[48]
1 “Advisory Fee” includes the management fee of a wholly-owned subsidiary of the Fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive or credit a portion of the advisory fee in an amount equal to the management fee paid to the Adviser by the Subsidiary.
[49]
2 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
[50]
3 The Adviser has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 1.85% for Class L, 2.10% for Class C and 0.93% for Class R6. The fee waivers and/or expense reimbursements will continue for at least one year from the date of this Prospectus or until such time as the  Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[51]
1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[52]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[53]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
[54]
2 The Standard & Poor’s 500® Index (S&P 500® Index) measures the performance of the large cap segment of the U.S. equities market, covering approximately 80% of the U.S. equities market. The Index includes 500 leading companies in leading industries of the U.S. economy. The Index is unmanaged and its returns do not include any sales charges or fees. Such costs would lower performance. It is not possible to invest directly in an index.
[55]
3 Since Inception reflects the inception date of the Fund.
[56]
1 “Advisory Fee” includes the management fee of a wholly-owned subsidiary of the Fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive or credit a portion of the advisory fee in an amount equal to the management fee paid to the Adviser by the Subsidiary.
[57]
2 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
[58]
3 The Adviser has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.85% for Class I, 1.20% for Class A, 1.95% for Class C and 0.80% for Class R6. The fee waivers and/or expense reimbursements will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.  
[59]
1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[60]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[61]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.
[62]
2 The Russell 3000® Index measures the performance of the largest 3,000 U.S. companies designed to represent approximately 98% of the investable U.S. equity market. The Russell 3000® Index is constructed to provide a comprehensive, unbiased and stable barometer of the broad market and is completely reconstituted annually to ensure new and growing equities are included. It is not possible to invest directly in an index.
[63]
3 Since Inception reflects the inception date of the Fund.
[64]
4 The Russell 3000® Health Care Net Index is a capitalization-weighted index of companies involved in medical services or health care. It is not possible to invest directly in an index.
[65]
1 The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.95% for Class I, 1.30% for Class A, 2.05% for Class  C and 0.90% for Class R6. The fee waivers and/or expense reimbursements will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[66]
1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
[67]
1 Investments in Class A shares 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 12 months, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
[68]
2 The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC.