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Mid Cap Growth Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Mid Cap Growth Portfolio
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Mid Cap Growth Portfolio (the "Portfolio") 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 and hold shares of the Portfolio. 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 Portfolio being purchased in a single transaction, together with the NAV of any Class A, Class L and Class C shares of the Portfolio of Morgan Stanley Institutional Fund Trust (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 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—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 shares of the Portfolio 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, on page 16 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.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in Total Annual Portfolio Operating Expenses or in the Example, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
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 Portfolio with the cost of investing in other mutual funds.


The example assumes that you invest $10,000 in the Portfolio, your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If You SOLD Your Shares:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If You HELD Your Shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal circumstances, at least 80% of the Portfolio's assets will be invested in common stocks of mid cap companies. This policy may be changed without shareholder approval; however you would be notified upon 60 days' notice in writing of any changes. The Portfolio'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, 2016 was between $175 million and $54.2 billion. The Adviser emphasizes a bottom-up stock selection process, seeking attractive investments on an individual company basis. 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 Portfolio may invest in equity securities. The Portfolio may also invest in privately placed and restricted securities.


The Portfolio may invest up to 25% of its net assets in securities of foreign issuers, including issuers located in emerging market or developing countries. The securities in which the Portfolio 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 Portfolio will achieve its investment objective, and you can lose money investing in this Portfolio. The principal risks of investing in the Portfolio 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 Capitalization 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, 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. The risks of investing in emerging market countries are greater than risks associated with investments in foreign developed countries. In addition, the Portfolio's investments in foreign issuers may be denominated in foreign currencies and therefore, to the extent unhedged, the value of the investment will fluctuate with the U.S. dollar exchange rates.


•  Liquidity. The Portfolio's investments in restricted and illiquid securities may entail greater risk than investments in other types of securities. These securities may be more difficult to sell, particularly in times of market turmoil. Additionally, the market for certain investments deemed liquid at the time of purchase may become illiquid under adverse market or economic conditions. Illiquid securities may be more difficult to value. If the Portfolio is forced to sell an illiquid security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss.


Shares of the Portfolio 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 Portfolio will achieve its investment objective, and you can lose money investing in this Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Shares of the Portfolio 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 Portfolio by showing changes in the Portfolio's Class I shares' performance from year-to-year and by showing how the Portfolio'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 Portfolio's returns in the table include the maximum applicable sales charge for Class A and assume you sold your shares at the end of each period (unless otherwise noted). The Portfolio's past performance, before and after taxes, is not necessarily an indication of how the Portfolio will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free (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 Portfolio by showing changes in the Portfolio's Class I shares' performance from year-to-year and by showing how the Portfolio'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 (800) 548-7786
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio's past performance, before and after taxes, is not necessarily an indication of how the Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

High Quarter

  

6/30/09

    

26.71

%

  

Low Quarter

  

12/31/08

    

–26.68

%

  
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.68%)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Portfolio's returns in the table include the maximum applicable sales charge for Class A and assume you sold your shares at the end of each period (unless otherwise noted).
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
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 Portfolio 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 Portfolio'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 Portfolio shares been sold at the end of the relevant periods, as applicable.
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 Portfolio'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 Portfolio 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 Portfolio shares been sold at the end of the relevant periods, as applicable.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for periods ended December 31, 2016)
Mid Cap Growth Portfolio | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 7.33% [1]
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 13.51% [1]
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 7.83% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.08% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 1990 [1]
Mid Cap Growth Portfolio | Lipper Multi-Cap Growth Funds Index (reflects no deductions for taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 3.05% [3]
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 13.30% [3]
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 6.90% [3]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.83% [2],[3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 1990 [3]
Mid Cap Growth Portfolio | Class I Shares  
Risk/Return: rr_RiskReturnAbstract  
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 0.50%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.74%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 76
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 237
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 411
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 918
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 76
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 237
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 411
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 918
Annual Return 2007 rr_AnnualReturn2007 22.87%
Annual Return 2008 rr_AnnualReturn2008 (47.22%)
Annual Return 2009 rr_AnnualReturn2009 60.19%
Annual Return 2010 rr_AnnualReturn2010 32.94%
Annual Return 2011 rr_AnnualReturn2011 (6.89%)
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%)
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (13.40%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 4.59%
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 4.87%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 11.05%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 1990
Mid Cap Growth Portfolio | Class I Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (21.59%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 0.80%
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 2.85%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.73%
Mid Cap Growth Portfolio | Class I Shares | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (0.52%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 3.82%
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 4.04%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.92%
Mid Cap Growth Portfolio | Class A Shares  
Risk/Return: rr_RiskReturnAbstract  
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 0.50%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.25%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments 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 Portfolio Shares" for further information about the CDSC waiver categories.
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 Portfolio being purchased in a single transaction, together with the NAV of any Class A, Class L and Class C shares of the Portfolio of Morgan Stanley Institutional Fund Trust (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 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—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 shares of the Portfolio 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
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
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (18.17%)
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 3.19%
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 4.04%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 31, 1997
Mid Cap Growth Portfolio | Class L  
Risk/Return: rr_RiskReturnAbstract  
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 0.50%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 0.36%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 164
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 508
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 876
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,911
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 164
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 508
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 876
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,911
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (14.19%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.39%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 14, 2012
Mid Cap Growth Portfolio | Class C  
Risk/Return: rr_RiskReturnAbstract  
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% [5]
Advisory Fee rr_ManagementFeesOverAssets 0.50%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.36% [6]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.86%
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—How to Redeem Portfolio Shares" for a complete discussion of the CDSC.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses for Class C shares have been estimated for the current fiscal year.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 289
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 585
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,006
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,180
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 189
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 585
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,006
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,180
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess As of the date of the Prospectus, the Fund had not commenced offering Class C shares of the Portfolio.
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 [7]
Average Annual Returns, Past 5 Years rr_AverageAnnualReturnYear05 [7]
Average Annual Returns, Past 10 Years rr_AverageAnnualReturnYear10 [7]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception [7]
Mid Cap Growth Portfolio | Class IS  
Risk/Return: rr_RiskReturnAbstract  
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 0.50%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.12%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 63
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 199
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 346
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 774
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 63
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 199
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 346
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 774
Average Annual Returns, Past 1 Year rr_AverageAnnualReturnYear01 (13.30%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (2.76%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 13, 2013
[1] 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] Since Inception reflects the inception date of Class I.
[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 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 Portfolio Shares" for further information about the CDSC waiver categories.
[5] The Class C CDSC is only applicable if you sell your shares within one year after purchase. See "Shareholder Information-How to Redeem Portfolio Shares" for a complete discussion of the CDSC.
[6] Other expenses for Class C shares have been estimated for the current fiscal year.
[7] As of the date of the Prospectus, the Fund had not commenced offering Class C shares of the Portfolio. Class C shares would have substantially similar annual returns because the shares are invested in the same portfolio of securities and the annual returns would differ only to the extent that the Classes do not have the same expenses. The returns for Class C shares are expected to be lower than the returns for Class I shares of the Portfolio as expenses of Class C shares are estimated to be higher. Return information for the Portfolio's Class C shares will be shown in future prospectuses offering the Portfolio's Class C shares after the Portfolio's Class C shares have a full calendar year of return information to report.