XML 326 R779.htm IDEA: XBRL DOCUMENT v3.19.1
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Transamerica Large Core  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <b>Transamerica Large Core </b>
Objective [Heading] rr_ObjectiveHeading <b>Investment Objective:</b>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks to provide capital appreciation.
Expense [Heading] rr_ExpenseHeading <b>Fees and Expenses:</b>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <b>Shareholder Fees (fees paid directly from your investment) </b>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) </b>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <b>Portfolio Turnover:</b>
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 annual fund operating expenses or in the Example, affect the fund’s performance.

During the most recent fiscal year, the portfolio turnover rate for the fund was 130% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 130.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management fees have been restated to reflect a reduction in management fees effective September 1, 2018.
Expense Example [Heading] rr_ExpenseExampleHeading <b>Example:</b>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example 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 for the time periods indicated and then redeem all shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading <b>Principal Investment Strategies: </b>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund normally invests primarily in issuers listed on U.S. exchanges that are classified as large cap blend. Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in securities of large-cap companies and other investments with similar economic characteristics. The fund considers large-cap companies to be companies with market capitalizations that, at the time of initial purchase, exceed the market capitalization of the smallest company included in the S&P 500® Index. As of December 31, 2018, the market capitalization of the smallest company in the S&P 500® Index was approximately $2.9 billion.

The fund’s sub-adviser, PineBridge Investments LLC (the “sub-adviser”), employs a process that categorizes companies according to where they reside in their respective company life cycles, and then lets the categorization drive how the companies are analyzed for investment attractiveness. Through their quantitative framework, the sub-adviser’s portfolio management team ranks companies within fundamentally similar groups of stocks based on six life-cycle stages (three types for growth companies and three for mature companies). After quantitatively categorizing each company in the universe into their six main life-cycle categorizations, the sub-adviser’s alpha model then quantitatively assesses the attractiveness of each company based on numerous factors that are considered relevant to each life-cycle category. The model generates a numerical ranking based on this quantitative categorization and factor-based assessment, which indicates the attractiveness of each stock. An optimization process is then used to build the portfolio using constraints relative to its core benchmark. Final portfolio positioning is subject to the discretion of the portfolio management team.

The equity securities in which the fund may invest include, but are not limited to, common stocks, depository receipts, preferred stocks and securities convertible into common stocks (such as warrants and rights). The fund may also invest up to 5% of its assets in index exchange-traded funds (“ETFs”).

Additionally, the fund may also invest its asset in cash, cash equivalent securities or other short-term debt securities, money market funds and U.S. government securities.
Risk [Heading] rr_RiskHeading <b>Principal Risks:</b>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Risk is inherent in all investing. Many factors affect the fund's performance. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks (in alphabetical order) of investing in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You may lose money if you invest in this fund.

Active Trading – The fund may purchase and sell securities without regard to the length of time held. Active trading may have a negative impact on performance by increasing transaction costs and may generate greater amounts of net short-term capital gains, which, for shareholders holding shares in taxable accounts, would generally be subject to tax at ordinary income tax rates upon distribution. During periods of market volatility, active trading may be more pronounced.

Convertible Securities – Convertible securities are subject to risks associated with both fixed income and equity securities. When the underlying common stock falls in value, the market price of the convertible security may be more influenced by the security’s yield and fixed income characteristics. When the underlying common stock rises in value, the market price may be more influenced by the equity conversion features. Convertible securities generally offer lower interest or dividend yields than non-convertible securities of similar quality.

Cybersecurity – Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, shareholder data (including private shareholder information), and/or proprietary information, or cause the fund, TAM, a sub-adviser and/or the fund's other service providers (including, but not limited to, fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. A cybersecurity incident may disrupt the processing of shareholder transactions, impact the fund's ability to calculate its net asset values, and prevent shareholders from redeeming their shares.

Depositary Receipts – Depositary receipts may be less liquid than the underlying shares in their primary trading market. Any distributions paid to the holders of depositary receipts are usually subject to a fee charged by the depositary. Holders of depositary receipts may have limited voting rights, and investment restrictions in certain countries may adversely impact the value of depositary receipts because such restrictions may limit the ability to convert equity shares into depositary receipts and vice versa. Such restrictions may cause equity shares of the underlying issuer to trade at a discount or premium to the market price of the depositary receipts.

Equity Securities – Equity securities represent an ownership interest in an issuer, rank junior in a company’s capital structure and consequently may entail greater risk of loss than debt securities. Equity securities include common and preferred stocks. Stock markets are volatile and the value of equity securities may go up or down sometimes rapidly and unpredictably. Equity securities may have greater price volatility than other asset classes, such as fixed income securities. The value of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions. If the market prices of the equity securities owned by the fund fall, the value of your investment in the fund will decline. If the fund holds equity securities in a company that becomes insolvent, the fund’s interests in the company will rank junior in priority to the interests of debtholders and general creditors of the company.

Growth Stocks – Returns on growth stocks may not move in tandem with returns on other categories of stocks or the market as a whole. Growth stocks typically are particularly sensitive to market movements because their market prices tend to reflect future expectations. When it appears those expectations may not be met, the prices of growth securities typically fall. Growth stocks as a group may be out of favor and underperform the overall equity market for a long period of time, for example, while the market favors “value” stocks.

Large Capitalization Companies – The fund’s investments in large capitalization companies may underperform other segments of the market because they may be less responsive to competitive challenges and opportunities and unable to attain high growth rates during periods of economic expansion. As a result, the fund’s value may not rise as much as, or may fall more than, the value of funds that focus on companies with smaller market capitalizations.

Legal and Regulatory – Legal and regulatory changes could occur that may adversely affect the fund, its investments, and its ability to pursue its investment strategies and/or increase the costs of implementing such strategies. New or revised laws or regulations may be imposed by the U.S. Securities and Exchange Commission, the U.S. Commodity Futures Trading Commission, the Internal Revenue Service, the U.S. Federal Reserve or other governmental regulatory authorities or self-regulatory organizations that could adversely affect the fund. The fund also may be adversely affected by changes in the enforcement or interpretation of existing statutes and rules by governmental regulatory authorities or self-regulatory organizations.

Management – The fund is subject to the risk that the investment manager’s or sub-adviser’s judgments and decisions may be incorrect or otherwise may not produce the desired results, causing the value of your investment to go down. The fund may also suffer losses if there are imperfections, errors or limitations in the quantitative, analytic or other tools, resources, information and data used, investment techniques applied, or the analyses employed or relied on, by the investment manager or sub-adviser, if such tools, resources, information or data are used incorrectly or otherwise do not work as intended, or if the investment manager’s or sub-adviser’s investment style is out of favor or otherwise fails to produce the desired results. In addition, the fund’s investment strategies or policies may change from time to time. Those changes may not lead to the results intended by the investment manager or sub-adviser and could have an adverse effect on the value or performance of the fund. Any of these things could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.

Market – The value of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates or currency rates, lack of liquidity in the markets or adverse investor sentiment. Adverse market conditions may be prolonged and may not have the same impact on all types of securities. The value of securities also may go down due to events or conditions that affect particular sectors, industries or issuers. If the value of the securities owned by the fund fall, the value of your investment will go down. The fund may experience a substantial or complete loss on any individual security.

In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. Governmental and non-governmental issuers have defaulted on, or been forced to restructure, their debts. These market conditions may continue, worsen or spread. Events that have contributed to these market conditions include, but are not limited to, major cybersecurity events; geopolitical events (including wars and terror attacks); measures to address budget deficits; downgrading of sovereign debt; declines in oil and commodity prices; dramatic changes in currency exchange rates; and public sentiment. The European Union has experienced increasing stress for a variety of reasons, including economic downturns in various member countries. In June 2016, the United Kingdom voted to withdraw from the European Union, and additional members could do the same. The impact of these conditions and events is not yet known.

There has been significant U.S. and non-U.S. government and central bank intervention in and support of financial markets during the past decade. The Federal Reserve has reduced and begun unwinding its market support activities and has begun raising interest rates. Certain foreign governments and central banks are implementing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases, unwinding of quantitative easing, or contrary actions by different governments, may not work as intended, could negatively affect financial markets generally, increase market volatility, and reduce the value and liquidity of securities in which the fund invests.

Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation, and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, terrorism, natural disasters and other circumstances in one country or region could have profound impacts on global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the fund's investments may be negatively affected.

Model and Data – If quantitative models, algorithms or calculations (whether proprietary and developed by the sub-adviser or supplied by third parties) (“Models”) or information or data supplied by third parties (“Data”) prove to be incorrect or incomplete, any decisions made, in whole or part, in reliance thereon expose the fund to additional risks. Models can be predictive in nature. The use of predictive Models has inherent risks. The success of relying on or otherwise using Models depends on a number of factors, including the validity, accuracy and completeness of the Model’s development, implementation and maintenance, the Model’s assumptions, factors, algorithms and methodologies, and the accuracy and reliability of the supplied historical or other Data. Models rely on, among other things, correct and complete Data inputs. If incorrect Data is entered into even a well-founded Model, the resulting information will be incorrect. However, even if Data is input correctly, Model prices may differ substantially from market prices, especially for securities with complex characteristics. Investments selected with the use of Models may perform differently than expected as a result of the design of the Model, inputs into the Model or other factors. There also can be no assurance that the use of Models will result in effective investment decisions for the fund.

Money Market Funds – An investment in a money market fund is not a bank deposit, and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. Although many money market funds seek to maintain a stable net asset value of $1.00 per share, it is possible to lose money by investing in such money market funds. Certain other money market funds float their net asset value. An investment in a money market fund is not guaranteed and it is possible for the fund to lose money by investing in money market funds.

Preferred Stock – Preferred stock’s right to dividends and liquidation proceeds is junior to the rights of a company’s debt securities. The value of preferred stock may be subject to factors that affect fixed income and equity securities, including changes in interest rates and in a company’s creditworthiness. The value of preferred stock tends to vary more with fluctuations in the underlying common stock and less with fluctuations in interest rates and tends to exhibit greater volatility. Shareholders of preferred stock may suffer a loss of value if dividends are not paid and have limited voting rights.

Underlying Exchange-Traded Funds – To the extent the fund invests its assets in underlying ETFs, its ability to achieve its investment objective will depend in part on the performance of the underlying ETFs in which it invests. Investing in underlying ETFs subjects the fund to the risks of investing in the underlying securities or assets held by those ETFs. Each of the underlying ETFs in which the fund may invest has its own investment risks, and those risks can affect the value of the underlying ETFs’ shares and therefore the value of the fund's investments. There can be no assurance that the investment objective of any underlying ETF will be achieved. To the extent that the fund invests more of its assets in one underlying ETF than in another, the fund will have greater exposure to the risks of that underlying ETF. In addition, the fund will bear a pro rata portion of the operating expenses of the underlying ETFs in which it invests.

Equity-based ETFs are subject to risks similar to those of stocks; fixed income-based ETFs are subject to risks similar to those of fixed-income securities. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange-traded) that has the same investment objectives, strategies and policies. The price of an ETF can fluctuate up and down, and the fund could lose money investing in an ETF if the prices of the securities owned by the ETF go down. In addition, ETFs are subject to certain risks that do not apply to conventional funds, including: (i) the market price of an ETF’s shares may be above or below the shares’ net asset value; (ii) during periods of market volatility, the share prices of ETFs may deviate significantly from their NAVs; (iii) an active trading market for an ETF’s shares may not develop or be maintained; (iv) trading of an ETF’s shares may be halted if the listing exchange’s officials deem such action appropriate, the shares are delisted from the exchange, the activation of market-wide “circuit breakers” (which are tied to large decreases in stock prices) halts stock trading generally, or trading in one or more of the ETF’s underlying securities is halted, which could result in the ETF being more volatile; or (v) a limited number of institutions may act as authorized participants to create or redeem block-sized units of ETF shares. In the event substantial market or other disruptions affecting ETFs should occur in the future, the liquidity and value of the fund's shares could also be substantially and adversely affected.

U.S. Government Agency Obligations – Government agency obligations have different levels of credit support and, therefore, different degrees of credit risk. Securities issued by agencies and instrumentalities of the U.S. government that are supported by the full faith and credit of the U.S. generally present a lesser degree of credit risk than securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the issuer’s right to borrow from the U.S. Treasury and securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the credit of the issuing agencies.

Warrants and Rights – Warrants and rights may be considered more speculative than certain other types of investments because they do not entitle a holder to the dividends or voting rights for the securities that may be purchased. They do not represent any rights in the assets of the issuing company, and cease to have value if not exercised prior to the expiration date.
Risk Lose Money [Text] rr_RiskLoseMoney <b>You may lose money if you invest in this fund.</b>
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <b>Performance:</b>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.

The fund acquired the assets and assumed the liabilities of three Transamerica Partners funds, including Transamerica Partners Institutional Large Core (the “predecessor fund”), on March 10, 2017, and the predecessor fund was the accounting and performance survivor of the reorganizations. This means that the predecessor fund's financial and performance history became the financial and performance history of the fund. In the reorganization of the predecessor fund, shareholders of the predecessor fund received Class R4 shares of the fund. The performance of Class R4 shares includes the performance of the predecessor fund prior to the reorganization, and has not been restated to reflect the annual operating expenses of Class R4 shares.

In the “10 Years or Since Inception” column of the table, returns are shown for ten years or since inception of the share class, whichever is less. Index returns are for ten years.

As with all mutual funds, past performance (before and after taxes) is not a prediction of future results. Updated performance information is available on our website at www.transamerica.com/individual/products/mutual-funds/performance/ or by calling 1-888-233-4339.

Prior to September 1, 2018, the fund had a different sub-adviser, a different investment objective and used different investment strategies. The performance set forth prior to that date is attributable to the previous sub-adviser.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-233-4339
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.transamerica.com/individual/products/mutual-funds/performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, past performance (before and after taxes) is not a prediction of future results.
Bar Chart [Heading] rr_BarChartHeading <b>Annual Total Returns (calendar years ended December 31) - Class R4 </b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Return
Best Quarter: 6/30/2009 14.30%
Worst Quarter: 9/30/2011 -14.32%
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns (periods ended December 31, 2018) </b>
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective September 1, 2018, the S&P 500<sup>®</sup>Index became the fund’s primary benchmark in order to make more meaningful comparisons of the fund’s performance relative to the investment strategies it employs. Prior to that date, the fund’s primary benchmark was the Russell 1000<sup>®</sup>Index.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Transamerica Large Core | R  
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 of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.45% [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Recaptured expense rr_Component1OtherExpensesOverAssets 0.05% [2]
All other expenses rr_Component2OtherExpensesOverAssets 0.05%
Other expenses rr_OtherExpensesOverAssets 0.10%
Total annual fund operating expenses rr_ExpensesOverAssets 1.05%
1 year rr_ExpenseExampleYear01 $ 107
3 years rr_ExpenseExampleYear03 334
5 years rr_ExpenseExampleYear05 579
10 years rr_ExpenseExampleYear10 $ 1,283
1 Year rr_AverageAnnualReturnYear01 (7.08%)
5 Years rr_AverageAnnualReturnYear05
Since Inception rr_AverageAnnualReturnSinceInception 4.50%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 10, 2017
Transamerica Large Core | R4  
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 of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.45% [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Recaptured expense rr_Component1OtherExpensesOverAssets 0.08% [2]
All other expenses rr_Component2OtherExpensesOverAssets 0.06%
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.84%
1 year rr_ExpenseExampleYear01 $ 86
3 years rr_ExpenseExampleYear03 268
5 years rr_ExpenseExampleYear05 466
10 years rr_ExpenseExampleYear10 $ 1,037
2009 rr_AnnualReturn2009 23.14%
2010 rr_AnnualReturn2010 11.45%
2011 rr_AnnualReturn2011 3.34%
2012 rr_AnnualReturn2012 16.95%
2013 rr_AnnualReturn2013 37.13%
2014 rr_AnnualReturn2014 14.80%
2015 rr_AnnualReturn2015 (1.02%)
2016 rr_AnnualReturn2016 7.79%
2017 rr_AnnualReturn2017 23.00%
2018 rr_AnnualReturn2018 (6.86%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.30%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.32%)
1 Year rr_AverageAnnualReturnYear01 (6.86%)
5 Years rr_AverageAnnualReturnYear05 7.01%
10 Years rr_AverageAnnualReturnYear10 12.31%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2000
Transamerica Large Core | I3  
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 of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.45% [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Recaptured expense rr_Component1OtherExpensesOverAssets 0.05% [2]
All other expenses rr_Component2OtherExpensesOverAssets 0.06%
Other expenses rr_OtherExpensesOverAssets 0.11%
Total annual fund operating expenses rr_ExpensesOverAssets 0.56%
1 year rr_ExpenseExampleYear01 $ 57
3 years rr_ExpenseExampleYear03 179
5 years rr_ExpenseExampleYear05 313
10 years rr_ExpenseExampleYear10 $ 701
1 Year rr_AverageAnnualReturnYear01 (6.58%)
5 Years rr_AverageAnnualReturnYear05
Since Inception rr_AverageAnnualReturnSinceInception 5.05%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 10, 2017
Transamerica Large Core | Return after taxes on distributions | R4  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (11.53%)
5 Years rr_AverageAnnualReturnYear05 5.33%
10 Years rr_AverageAnnualReturnYear10 11.15%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2000
Transamerica Large Core | Return after taxes on distributions and sale of fund shares | R4  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.64%)
5 Years rr_AverageAnnualReturnYear05 5.20%
10 Years rr_AverageAnnualReturnYear10 9.96%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2000
Transamerica Large Core | S&P 500® (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.38%) [3]
5 Years rr_AverageAnnualReturnYear05 8.49% [3]
10 Years rr_AverageAnnualReturnYear10 13.12% [3]
Transamerica Large Core | Russell 1000® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.78%) [4]
5 Years rr_AverageAnnualReturnYear05 8.21% [4]
10 Years rr_AverageAnnualReturnYear10 13.28% [4]
[1] Management fees have been restated to reflect a reduction in management fees effective September 1, 2018.
[2] Contractual arrangements have been made with the fund’s investment manager, Transamerica Asset Management, Inc. (“TAM”), through March 1, 2020 to waive fees and/or reimburse fund expenses to the extent that total annual fund operating expenses exceed 1.15% for Class R shares, 0.90% for Class R4 shares and 0.65% for Class I3 shares, excluding, as applicable, acquired fund fees and expenses, interest, taxes, brokerage commissions, dividend and interest expenses on securities sold short, extraordinary expenses and other expenses not incurred in the ordinary course of the fund’s business. These arrangements cannot be terminated prior to March 1, 2020 without the Board of Trustees’ consent. TAM is permitted to recapture amounts waived and/or reimbursed to a class during any of the 36 months from the date on which TAM waived fees and/or reimbursed expenses for the class. A class may reimburse TAM only if such reimbursement does not cause, on any particular business day of the fund, the class’s total annual operating expenses (after the reimbursement is taken into account) to exceed the applicable limits described above or any other lower limit then in effect. “Recaptured expense” for Class R shares, Class R4 shares and Class I3 shares have been restated to reflect estimated recaptured amounts in the current fiscal year.
[3] Effective September 1, 2018, the S&P 500®Index became the fund’s primary benchmark in order to make more meaningful comparisons of the fund’s performance relative to the investment strategies it employs. Prior to that date, the fund’s primary benchmark was the Russell 1000®Index.
[4] "Russell®" and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.