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(Morgan Stanley Insight Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Investment Objective </b></div>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Morgan Stanley Insight Fund (the "Fund") seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Fees and Expenses </b></div>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
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 Class A, Class B, Class L and Class C shares of the Fund 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 as well as Class A, Class B, Class L and Class C shares of any other Morgan Stanley Multi-Class Fund (as defined in the section of the Prospectus entitled "Shareholder Information—How to Exchange Shares—Permissible Fund Exchanges") and including shares of Morgan Stanley Money Market Funds (as defined in the section of the Prospectus entitled "Shareholder Information—How to Exchange Shares—Permissible Fund Exchanges") that you acquired in an exchange of Class A shares of the Fund or Class A shares of another Morgan Stanley Multi-Class Fund already held in Related Accounts as of the date of the transaction, amounts to $25,000 or more. More information about this combined purchase discount and other discounts is available from your financial intermediary and on page 19 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 Class A, Class B, Class L and Class C shares of the Fund 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 as well as Class A, Class B, Class L and Class C shares of any other Morgan Stanley Multi-Class Fund (as defined in the section of the Prospectus entitled "Shareholder Information—How to Exchange Shares—Permissible Fund Exchanges") and including shares of Morgan Stanley Money Market Funds (as defined in the section of the Prospectus entitled "Shareholder Information—How to Exchange Shares—Permissible Fund Exchanges") that you acquired in an exchange of Class A shares of the Fund or Class A shares of another Morgan Stanley Multi-Class Fund already held in Related Accounts as of the date of the transaction, amounts to $25,000 or more.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Shareholder Fees (fees paid directly from your investment) </b></div>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) </b></div>
Expense Example [Heading] rr_ExpenseExampleHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b>Example</b></div>
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 for the ten-year amounts for Class B shares that reflect the conversion to Class A shares six years after the end of the calendar month in which the shares were purchased and except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). 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 <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b>If You SOLD Your Shares</b></div>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b>If You HELD Your Shares</b></div>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Portfolio Turnover </b></div>
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 73% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 73.00%
Strategy [Heading] rr_StrategyHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Principal Investment Strategies </b></div>
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, 2018 was between $3.9 million and $768.7 billion. 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 seeks to invest in high quality companies it believes have sustainable competitive advantages and the ability to redeploy capital at high rates of return. 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 Fund may invest in 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 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 conducts research to examine how environmental and social initiatives within companies can drive enterprise value by creating growth opportunities, reducing risk, driving profitability, strengthening durable competitive advantages and/or aligning with secular growth trends. Other aspects of the investment process include a proprietary, systematic evaluation of governance policies, specifically focusing on compensation alignment on long-term value creation. The Adviser does not treat ESG as a deterministic, reductive screen, nor as a portfolio construction tool layered on top of a passive vehicle.
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 <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Principal Risks </b></div>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund. The principal risks of investing in the Fund include:
  • 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 and political conditions.
  • 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.
  • Foreign and Emerging Market Securities. Investments in foreign markets entail special risks such as currency, political, economic and market risks. There also may be greater market volatility, less reliable financial information, 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 ongoing 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, entities and/or individuals, changes in international trading patterns, trade barriers and other protectionist or retaliatory measures. Economic sanctions could, among other things, effectively restrict or eliminate the Fund's ability to purchase or sell securities or groups of securities for a substantial period of time, and may make the Fund's investments in such securities harder to value. The risks of investing in emerging market countries are greater than the risks associated with investments in foreign developed 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.
  • Liquidity. The Fund may make investments that are illiquid or restricted or that may become 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.
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.
Risk Lose Money [Text] rr_RiskLoseMoney There is no assurance that the Fund will achieve its investment objective, and you can lose money investing in this Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Past Performance </b></div>
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 one, five and 10 year periods and since inception compare with those of a broad measure of market performance, as well as an index that represents a group of similar mutual funds, over time. 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 each class 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) 548-7786.
Bar Chart [Heading] rr_BarChartHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Annual Total Returns—Calendar Years </b></div>
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.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

High Quarter

06/30/09

22.71%

Low Quarter

12/31/18

-15.92%
Performance Table Heading rr_PerformanceTableHeading <div style="font-size:10pt;padding-top:5pt;padding-bottom:0;padding-left:0;"><b> Average Annual Total Returns (for periods ended December 31, 2018) </b></div>
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 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. 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.
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund's returns in the table include the maximum applicable sales charge for each class 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.
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.
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.
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 one, five and 10 year periods and since inception compare with those of a broad measure of market performance, as well as an index that represents a group of similar mutual funds, over time.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for the Fund's other classes will vary from the Class A shares' returns.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 548-7786
(Morgan Stanley Insight Fund) | Russell 3000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
Past 1 Year rr_AverageAnnualReturnYear01 (2.12%) [1]
Past 5 Years rr_AverageAnnualReturnYear05 9.99% [1]
Past 10 Years rr_AverageAnnualReturnYear10 15.15% [1]
Since Inception rr_AverageAnnualReturnSinceInception 6.37% [1],[2]
(Morgan Stanley Insight Fund) | Lipper Multi-Cap Growth Funds Index (reflects no deduction for taxes)  
Prospectus: rr_ProspectusTable  
Past 1 Year rr_AverageAnnualReturnYear01 (3.23%) [3]
Past 5 Years rr_AverageAnnualReturnYear05 8.01% [3]
Past 10 Years rr_AverageAnnualReturnYear10 14.10% [3]
Since Inception rr_AverageAnnualReturnSinceInception 6.28% [2],[3]
(Morgan Stanley Insight Fund) | Class A  
Prospectus: rr_ProspectusTable  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption) rr_MaximumDeferredSalesChargeOverOther none [4]
Advisory Fee rr_ManagementFeesOverAssets 0.66%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.15% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [5]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.15% [5]
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 18 months after the last day of the month of 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 2009 rr_AnnualReturn2009 69.96%
Annual Return 2010 rr_AnnualReturn2010 26.90%
Annual Return 2011 rr_AnnualReturn2011 (7.80%)
Annual Return 2012 rr_AnnualReturn2012 12.20%
Annual Return 2013 rr_AnnualReturn2013 49.61%
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%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.71%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.92%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Past 1 Year rr_AverageAnnualReturnYear01 6.26% [6]
Past 5 Years rr_AverageAnnualReturnYear05 11.31% [6]
Past 10 Years rr_AverageAnnualReturnYear10 19.02% [6]
Since Inception rr_AverageAnnualReturnSinceInception 9.20% [6]
(Morgan Stanley Insight Fund) | Class A | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
Past 1 Year rr_AverageAnnualReturnYear01 3.83% [6],[7]
Past 5 Years rr_AverageAnnualReturnYear05 8.18% [6],[7]
Past 10 Years rr_AverageAnnualReturnYear10 16.88% [6],[7]
Since Inception rr_AverageAnnualReturnSinceInception 8.26% [6],[7]
(Morgan Stanley Insight Fund) | Class A | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
Past 1 Year rr_AverageAnnualReturnYear01 4.95% [6]
Past 5 Years rr_AverageAnnualReturnYear05 8.32% [6]
Past 10 Years rr_AverageAnnualReturnYear10 15.85% [6]
Since Inception rr_AverageAnnualReturnSinceInception 7.79% [6]
(Morgan Stanley Insight Fund) | Class B  
Prospectus: rr_ProspectusTable  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption) rr_MaximumDeferredSalesChargeOverOther 5.00% [8]
Advisory Fee rr_ManagementFeesOverAssets 0.66%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.06% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [5]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.02% [5]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class B CDSC is scaled down to 1.00% during the sixth year, reaching zero thereafter. See "Shareholder Information—Share Class Arrangements" for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 705
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 942
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,305
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,938
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 205
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 642
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,105
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,938
Past 1 Year rr_AverageAnnualReturnYear01 6.24% [6]
Past 5 Years rr_AverageAnnualReturnYear05 11.41% [6]
Past 10 Years rr_AverageAnnualReturnYear10 18.94% [6],[9]
Since Inception rr_AverageAnnualReturnSinceInception 8.99% [6],[9]
(Morgan Stanley Insight Fund) | Class L  
Prospectus: rr_ProspectusTable  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption) rr_MaximumDeferredSalesChargeOverOther none
Advisory Fee rr_ManagementFeesOverAssets 0.66%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 0.22%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.63% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [5]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.63% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 166
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 514
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 886
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,933
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 166
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 514
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 886
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,933
Past 1 Year rr_AverageAnnualReturnYear01 11.59% [6]
Past 5 Years rr_AverageAnnualReturnYear05 11.93% [6]
Past 10 Years rr_AverageAnnualReturnYear10 18.94% [6]
Since Inception rr_AverageAnnualReturnSinceInception 8.73% [6]
(Morgan Stanley Insight Fund) | Class I  
Prospectus: rr_ProspectusTable  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption) rr_MaximumDeferredSalesChargeOverOther none
Advisory Fee rr_ManagementFeesOverAssets 0.66%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.20%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.86% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [5]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.86% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 274
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 477
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,061
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 88
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 274
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 477
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,061
Past 1 Year rr_AverageAnnualReturnYear01 12.47% [6]
Past 5 Years rr_AverageAnnualReturnYear05 12.87% [6]
Past 10 Years rr_AverageAnnualReturnYear10 20.01% [6]
Since Inception rr_AverageAnnualReturnSinceInception 9.75% [6]
(Morgan Stanley Insight Fund) | Class C  
Prospectus: rr_ProspectusTable  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption) rr_MaximumDeferredSalesChargeOverOther 1.00% [10]
Advisory Fee rr_ManagementFeesOverAssets 0.66%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.90% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [5]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.90% [5]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Class C CDSC is only applicable if you sell your shares within one year after purchase. See "Shareholder Information—Share Class Arrangements" for a complete discussion of the CDSC.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 293
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 597
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,026
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,222
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 193
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 597
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,026
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,222
Past 1 Year rr_AverageAnnualReturnYear01 10.33% [6]
Past 5 Years rr_AverageAnnualReturnYear05 [6]
Past 10 Years rr_AverageAnnualReturnYear10 [6]
Since Inception rr_AverageAnnualReturnSinceInception 13.20% [6]
(Morgan Stanley Insight Fund) | Class IS  
Prospectus: rr_ProspectusTable  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption) rr_MaximumDeferredSalesChargeOverOther none
Advisory Fee rr_ManagementFeesOverAssets 0.66%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 2.14%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.80% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.95%) [5]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.85% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 683
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,306
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,986
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 87
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 683
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,306
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,986
Past 1 Year rr_AverageAnnualReturnYear01 12.50% [6]
Past 5 Years rr_AverageAnnualReturnYear05 12.94% [6]
Past 10 Years rr_AverageAnnualReturnYear10 [6]
Since Inception rr_AverageAnnualReturnSinceInception 15.55% [6]
[1] 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. The Russell 3000® Index measures the performance of the largest 3000 U.S. companies representing approximately 98% of the investable U.S. equity market. It is not possible to invest directly in an index.
[2] Since inception reflects the inception date of Class A.
[3] The Lipper Multi-Cap Growth Funds Index is an equally weighted performance index of the largest qualifying funds (based on net assets) in the Lipper Multi-Cap Growth Funds classification. There are currently 30 funds represented in this index
[4] 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 18 months after the last day of the month of purchase, except for certain specific circumstances. See "Shareholder Information—Share Class Arrangements" for further information about the CDSC waiver categories.
[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 certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.27% for Class A, 2.02% for Class B, 1.77% for Class L, 0.92% for Class I, 2.02% for Class C and 0.85% for Class IS. The fee waivers and/or expense reimbursements will continue for at least one year 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.
[6] Class A, L and I shares commenced operations on July 28, 1997. Class B shares commenced operations on February 27, 1996, Class IS shares commenced operations on September 13, 2013 and Class C shares commenced operations on April 30, 2015.
[7] 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.
[8] The Class B CDSC is scaled down to 1.00% during the sixth year, reaching zero thereafter. See "Shareholder Information—Share Class Arrangements" for a complete discussion of the CDSC.
[9] Effective February 2019, Class B shares will generally convert to Class A shares approximately six years after the end of the calendar month in which the shares were purchased. The "Past 10 Years" and "Since Inception" performance for Class B shares reflects the conversion to Class A shares approximately eight years after the end of the calendar month in which the shares were purchased, as effective on December 31, 2018.
[10] The Class C CDSC is only applicable if you sell your shares within one year after purchase. See "Shareholder Information—Share Class Arrangements" for a complete discussion of the CDSC.