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(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery Portfolio)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Discovery Portfolio (the “Fund”) seeks long-term capital growth.
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 Class A, 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—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction as well as Class A, Class L and Class C shares of any other Morgan Stanley Multi-Class Fund excluding Morgan Stanley Institutional Fund Trust Short Duration Income, Ultra-Short Income and Ultra-Short Municipal Income Portfolios (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) and including shares of Morgan Stanley Money Market Funds (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) that you acquired in an exchange of Class A, Class L or Class C shares of the Fund or Class A, Class L or Class C shares of another Morgan Stanley Multi-Class Fund excluding Morgan Stanley Institutional Fund Trust Short Duration Income, Ultra-Short Income and Ultra-Short Municipal Income Portfolios 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, on page 19 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 Class A, 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—Sales Charges Applicable to Purchases of Class A Shares”) as of the date of the transaction as well as Class A, Class L and Class C shares of any other Morgan Stanley Multi-Class Fund excluding Morgan Stanley Institutional Fund Trust Short Duration Income, Ultra-Short Income and Ultra-Short Municipal Income Portfolios (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) and including shares of Morgan Stanley Money Market Funds (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) that you acquired in an exchange of Class A, Class L or Class C shares of the Fund or Class A, Class L or Class C shares of another Morgan Stanley Multi-Class Fund excluding Morgan Stanley Institutional Fund Trust Short Duration Income, Ultra-Short Income and Ultra-Short Municipal Income Portfolios 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 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. 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 115% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 115.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund’s “Adviser,” Morgan Stanley Investment Management Inc., seeks long-term capital growth by investing primarily in established and emerging companies with capitalizations within the range of companies included in the Russell Midcap® Growth Index, which as of December 31, 2021 was between $181.2 million and $55.8 billion. The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. 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 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 in equity securities. The Fund may also invest in privately placed and restricted securities.
The Fund may invest up to 25% of its total assets in securities of foreign issuers, including issuers located in emerging market or developing countries. The securities in which the Fund may invest may be denominated in U.S. dollars or in currencies other than U.S. dollars.
Risk [Heading] rr_RiskHeading Principal Risks
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.
• Mid Cap Companies. Investments in mid cap companies may involve greater risks than investments in larger, more established companies. The securities issued by 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, 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 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, 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 markets 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 may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar governmental actions could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell securities or groups of securities, and thus may make the Fund’s investments in such securities less liquid or more difficult to value. In addition, as a result of economic sanctions, the Fund may be forced to sell or otherwise dispose of investments at inopportune times or prices.
• 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.
• Focused Investing. To the extent that the Fund invests in a limited number of issuers, the Fund will be more susceptible to negative events affecting those issuers and a decline in the value of a particular instrument may cause the Fund’s overall value to decline to a greater degree than if the Fund were invested more widely.
• 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.
• Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which may 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 and social unrest) 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.
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 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 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 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 1-800-548-7786.
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 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 Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-548-7786
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 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
69.78%
Low Quarter
12/31/18
-19.00%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the calendar periods ended December 31, 2021)
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 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.
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery Portfolio) | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
Past One Year rr_AverageAnnualReturnYear01 12.73% [1]
Past Five Years rr_AverageAnnualReturnYear05 19.83% [1]
Past Ten Years rr_AverageAnnualReturnYear10 16.63% [1]
Since Inception rr_AverageAnnualReturnSinceInception 11.56% [1],[2]
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery Portfolio) | Lipper Mid-Cap Growth Funds Index (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
Past One Year rr_AverageAnnualReturnYear01 12.22% [3]
Past Five Years rr_AverageAnnualReturnYear05 19.92% [3]
Past Ten Years rr_AverageAnnualReturnYear10 15.86% [3]
Since Inception rr_AverageAnnualReturnSinceInception 11.06% [2],[3]
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery 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 0.50% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.72%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 74
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 230
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 401
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 894
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 74
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 230
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 401
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 894
Annual Return 2012 rr_AnnualReturn2012 9.49%
Annual Return 2013 rr_AnnualReturn2013 38.35%
Annual Return 2014 rr_AnnualReturn2014 1.33%
Annual Return 2015 rr_AnnualReturn2015 (5.86%)
Annual Return 2016 rr_AnnualReturn2016 (13.40%)
Annual Return 2017 rr_AnnualReturn2017 39.35%
Annual Return 2018 rr_AnnualReturn2018 12.14%
Annual Return 2019 rr_AnnualReturn2019 39.80%
Annual Return 2020 rr_AnnualReturn2020 142.56%
Annual Return 2021 rr_AnnualReturn2021 (11.92%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 69.78%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.00%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Past One Year rr_AverageAnnualReturnYear01 (11.92%)
Past Five Years rr_AverageAnnualReturnYear05 36.09%
Past Ten Years rr_AverageAnnualReturnYear10 19.30%
Since Inception rr_AverageAnnualReturnSinceInception 14.66%
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery Portfolio) | Class I | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
Past One Year rr_AverageAnnualReturnYear01 (18.58%) [6]
Past Five Years rr_AverageAnnualReturnYear05 29.51% [6]
Past Ten Years rr_AverageAnnualReturnYear10 14.25% [6]
Since Inception rr_AverageAnnualReturnSinceInception 11.77% [6]
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery Portfolio) | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Prospectus: rr_ProspectusTable  
Past One Year rr_AverageAnnualReturnYear01 (4.24%)
Past Five Years rr_AverageAnnualReturnYear05 27.78%
Past Ten Years rr_AverageAnnualReturnYear10 14.00%
Since Inception rr_AverageAnnualReturnSinceInception 11.58%
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery 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 [7]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.00%
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—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 622
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 827
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,048
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,685
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 622
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 827
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,048
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,685
Past One Year rr_AverageAnnualReturnYear01 (16.81%)
Past Five Years rr_AverageAnnualReturnYear05 34.24%
Past Ten Years rr_AverageAnnualReturnYear10 18.33%
Since Inception rr_AverageAnnualReturnSinceInception 12.87%
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery 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 0.50% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 456
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 787
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,724
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 147
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 456
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 787
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,724
Past One Year rr_AverageAnnualReturnYear01 (12.56%)
Past Five Years rr_AverageAnnualReturnYear05 35.00%
Past Ten Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 18.89%
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery 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% [8]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.71%
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 $ 274
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 539
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 928
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,831
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 174
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 539
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 928
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,831
Past One Year rr_AverageAnnualReturnYear01 (13.33%)
Past Five Years rr_AverageAnnualReturnYear05
Past Ten Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 31.48%
(MSIFT Discovery Portfolio - Classes I, A, L, C and IS) | (Discovery Portfolio) | Class IS  
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 0.50% [4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11% [5]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 195
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 340
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 762
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 62
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 195
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 340
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 762
Past One Year rr_AverageAnnualReturnYear01 (11.81%)
Past Five Years rr_AverageAnnualReturnYear05 36.18%
Past Ten Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 19.12%
[1]
2 The Russell Midcap® Growth Index measures the performance of the mid-cap growth segment of the U.S. equity universe. It includes those Russell Midcap® Index companies with higher price-to-book ratios and higher forecasted growth values. The Russell Midcap® Index is a subset of the Russell 1000® Index and includes approximately 800 of the smallest securities in the Russell 1000® Index, which in turn consists of approximately 1,000 of the largest U.S. securities based on a combination of market capitalization and current index membership. It is not possible to invest directly in an index.
[2]
3 Since Inception reflects the inception date of Class I.
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4 The Lipper Mid-Cap Growth Funds Index is an equally weighted performance index of the largest qualifying funds (based on net assets) in the Lipper Mid-Cap Growth Funds classification. There are currently 30 funds represented in this Index.
[4]
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.
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4 “Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.
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1 These returns do not reflect any tax consequences from a sale of your shares at the end of each period.
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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 18 months after the last day of the month of purchase, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.
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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.