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(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Morgan Stanley Insight Fund (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—Share Class Arrangements”) 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 financial intermediary and on page 27 of the Prospectus in the section entitled “Shareholder Information—Share Class Arrangements.” In addition, Appendix A attached to the Prospectus contains information regarding Financial Intermediary-specific sales charge waivers and discounts.
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—Share Class Arrangements”) 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 that 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 40%  of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 40.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund’s assets will be invested primarily in a portfolio of common stocks of companies with market capitalizations, at the time of purchase, within the capitalization range of the companies comprising the Russell 3000® Growth Index, which as of December 31,  2023 was between $19.7 million and $3.0 trillion. The Adviser seeks long-term capital appreciation by investing primarily in established and emerging companies. 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 Fund may invest in other types of equity securities. The Fund may, but it is not required to, use derivative instruments as discussed herein. These derivative instruments will be counted toward the Fund’s exposure in the types of securities listed herein to the extent they have economic characteristics similar to such securities. 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 up to 25% of its net 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 Fund may invest in privately placed and restricted securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Past Performance
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 A shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and 10 year periods and since inception compare with those of one or more indexes intended to measure broad market performance. The Fund’s primary benchmark index was changed from the Russell 3000® Growth Index to the Russell 3000® Index effective April 30, 2024 to comply with the regulation that requires the Fund’s primary benchmark to represent the overall applicable market. The additional index in the table provides a means to compare the Fund’s average annual 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 performance information in the bar chart does not  reflect the deduction of sales charges; if these amounts were  reflected, returns would be less than shown. The 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 A shares’ performance from year-to-year and by showing how the Fund’s average annual returns for the past one, five and 10 year periods and since inception compare with those of one or more indexes intended to measure broad 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
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The performance information in the bar chart does not  reflect the deduction of sales charges; if these amounts were  reflected, returns would be less than shown.
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 an 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 (“IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for the Fund’s other share classes will vary from the Class A shares’ returns.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher After-tax returns may be higher than before-tax returns due to foreign tax credits and/or 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
59.29%
Low Quarter
06/30/22
-41.51%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns  (for the calendar periods ended December 31, 2023)
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 share classes will vary from the Class A shares’ returns. Actual after-tax returns depend on an 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 (“IRAs”). After-tax returns may be higher than before-tax returns due to foreign tax credits and/or 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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. The prices of equity securities fluctuate, and sometimes widely fluctuate, 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 conditions 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 may be subject to heightened risks.
 
The value of equity securities and related instruments may decline in response to adverse changes in the economy or the economic outlook; deterioration in investor sentiment; 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 may affect certain types of stocks to a greater extent than other types of stocks. If the stock market declines, the value of Fund shares will also likely decline.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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. There also may be greater market volatility, less reliable financial information, less stringent investor protections and disclosure standards, higher transaction and custody costs, 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, the imposition of economic sanctions against a particular country or countries, organizations, companies, entities and/or individuals, changes in international trading patterns, trade barriers and other protectionist or retaliatory measures. Investments in foreign markets may also be adversely affected by governmental 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 in response to market developments or adverse investor perceptions, or become illiquid after purchase by the Fund, particularly during periods of market 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. Certain emerging market countries may be subject 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. To the extent hedged 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 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. 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, 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Liquidity. The Fund may make investments that are 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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 securities, which are subject to resale restrictions. These securities could have the effect of increasing the level of Fund illiquidity to the extent the Fund may be unable to sell or transfer these securities due to restrictions on transfers or on the ability to find buyers interested in purchasing the securities. Additionally, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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 and other events that affect markets generally, as well as those that affect particular regions, countries, industries, companies or governments. These events may be sudden and unexpected, and could adversely affect the liquidity of the Fund’s investments, which may in turn impact valuation, 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, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, interest rate changes and supply chain disruptions) adversely interrupt the global economy and financial markets. It is difficult to predict when events affecting the U.S. or global financial markets may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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.
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 25.96% [1]
5 Years rr_AverageAnnualReturnYear05 15.16% [1]
10 Years rr_AverageAnnualReturnYear10 11.48% [1]
Since Inception rr_AverageAnnualReturnSinceInception 8.42% [1],[2]
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | Russell 3000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 41.21% [3]
5 Years rr_AverageAnnualReturnYear05 18.85% [3]
10 Years rr_AverageAnnualReturnYear10 14.33% [3]
Since Inception rr_AverageAnnualReturnSinceInception 8.62% [2],[3]
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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 [4]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25% [6]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.15% [7]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [7]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.15% [7]
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 after purchase, except for certain specific circumstances. See “Shareholder Information—Share Class Arrangements” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 636
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 871
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,125
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,849
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 636
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 871
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,125
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,849
Annual Return 2014 rr_AnnualReturn2014 4.92%
Annual Return 2015 rr_AnnualReturn2015 7.88%
Annual Return 2016 rr_AnnualReturn2016 (3.90%)
Annual Return 2017 rr_AnnualReturn2017 47.82%
Annual Return 2018 rr_AnnualReturn2018 12.14%
Annual Return 2019 rr_AnnualReturn2019 33.02%
Annual Return 2020 rr_AnnualReturn2020 116.01%
Annual Return 2021 rr_AnnualReturn2021 (6.60%)
Annual Return 2022 rr_AnnualReturn2022 (63.45%)
Annual Return 2023 rr_AnnualReturn2023 52.72%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 59.29%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (41.51%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
1 Year rr_AverageAnnualReturnYear01 44.68%
5 Years rr_AverageAnnualReturnYear05 8.41%
10 Years rr_AverageAnnualReturnYear10 10.45%
Since Inception rr_AverageAnnualReturnSinceInception 9.27%
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | Class A | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 44.68% [8]
5 Years rr_AverageAnnualReturnYear05 5.20% [8]
10 Years rr_AverageAnnualReturnYear10 7.26% [8]
Since Inception rr_AverageAnnualReturnSinceInception 7.89% [8]
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | Class A | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 26.45%
5 Years rr_AverageAnnualReturnYear05 6.81%
10 Years rr_AverageAnnualReturnYear10 8.02%
Since Inception rr_AverageAnnualReturnSinceInception 7.91%
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24% [6]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.64% [7]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [7]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.64% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 167
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 517
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 892
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,944
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 167
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 517
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 892
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,944
1 Year rr_AverageAnnualReturnYear01 52.08%
5 Years rr_AverageAnnualReturnYear05 9.09%
10 Years rr_AverageAnnualReturnYear10 10.50%
Since Inception rr_AverageAnnualReturnSinceInception 8.80%
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28% [6]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.93% [7]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.01% [7]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.92% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 295
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 514
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,142
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 94
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 295
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 514
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,142
1 Year rr_AverageAnnualReturnYear01 53.03%
5 Years rr_AverageAnnualReturnYear05 9.88%
10 Years rr_AverageAnnualReturnYear10 11.36%
Since Inception rr_AverageAnnualReturnSinceInception 9.77%
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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% [9]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27% [6]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.92% [7]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [7]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.92% [7]
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—Share Class Arrangements” for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 295
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 603
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,037
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,043
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 195
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 603
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,037
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,043
1 Year rr_AverageAnnualReturnYear01 50.34%
5 Years rr_AverageAnnualReturnYear05 8.78%
Since Inception rr_AverageAnnualReturnSinceInception 10.70% [10]
(Morgan Stanley Insight Fund - Classes A, L, I, C and R6) | (Morgan Stanley Insight Fund) | 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% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15% [6]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.80% [7]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [7]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.80% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 444
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 990
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 255
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 444
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 990
1 Year rr_AverageAnnualReturnYear01 53.21%
5 Years rr_AverageAnnualReturnYear05 9.94%
10 Years rr_AverageAnnualReturnYear10 11.43%
Since Inception rr_AverageAnnualReturnSinceInception 12.79%
[1]
4 The Russell 3000® Index measures the performance of the largest 3000 U.S. companies representing approximately 96% of the investable U.S. equity market. It is not possible to invest directly in an index.
[2]
5 Since inception reflects the inception date of Class A shares.
[3]
6 The Russell 3000® Growth Index measures the performance of the broad growth segment of the U.S. equity universe. It includes those Russell 3000® Index companies with higher price-to-book ratios and higher forecasted growth values. It is not possible to invest directly in an index.
[4]
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 after purchase, except for certain specific circumstances. See “Shareholder Information—Share Class Arrangements” for further information about the CDSC waiver categories.
[5]
3 “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,” 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.
[6]
4 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
[7]
5 The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee, its administration 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 1.27% for Class A, 1.77% for Class L, 0.92% for Class I, 2.02% for Class C and 0.85% 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 Fund’s Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[8]
2 These returns do not reflect any tax consequences from a sale of your shares at the end of each period, but they do reflect any applicable sales charges on such a sale.
[9]
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—Share Class Arrangements” for a complete discussion of the CDSC.
[10]
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.