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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Retail Class | Transamerica Concentrated Growth  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <b>Transamerica Concentrated Growth </b>
Objective [Heading] rr_ObjectiveHeading <b>Investment Objective:</b>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks to achieve long-term growth of capital.
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.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Transamerica Funds. More information about these and other discounts is available from your financial professional, in the “Waivers and Reductions of Sales Charges” section on page 328 of the fund’s prospectus, in the Appendix – “Waivers and Discounts Available from Intermediaries,” and in the fund’s statement of additional information (SAI) under the heading “Purchase of Shares.”
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 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of Class A shares in amounts of $1 million or more that are not subject to an initial sales charge may be subject to a 1.00% contingent deferred sales charge if those shares are redeemed within 24 months of their purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Transamerica Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 (unless otherwise indicated). 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:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption <b>If the shares are redeemed at the end of each period: </b>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <b>If the shares are not redeemed: </b>
Strategy [Heading] rr_StrategyHeading <b>Principal Investment Strategies:</b>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal circumstances, the fund’s sub-adviser, Torray LLC (the “sub-adviser”), will invest at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in equity securities of large capitalization companies with proven records of increasing earnings on a consistent and sustainable basis. The fund considers large capitalization companies to be those companies with market capitalizations of $5 billion or more at the time of purchase. Sustainable growth is a product of businesses generally characterized by durable competitive advantages, high returns on and efficient use of capital, low financial and operating volatility, high levels of recurring revenue and low exposure to cyclical trends. Companies are reviewed on a fundamental basis in the context of long-term secular themes.

The fund employs a concentrated approach, investing in 25 to 30 stocks, with a long-term orientation and a quality focus. Correlation of securities and underlying businesses is considered in an effort to minimize risk within the fund. Initial positions range from 2% to 3% of assets and may be increased over time to between 5% and 7%. Individual positions will not exceed 7%. Sector weights are independent of benchmarks, ranging from 0% to 35%, and cash is not employed in a tactical or strategic manner.

The fund may invest in the securities of foreign issuers, including American Depositary Receipts (“ADRs”) and foreign securities trading on U.S. markets.

Risk control is an integral part of the sub-adviser’s process. In the context of security selection, the focus is on quality, which is defined as businesses demonstrating consistent financial and operating metrics through a full business cycle, high returns on capital, appropriate leverage and reasonable valuation. Risk control is also a primary part of portfolio construction. In order to achieve effective diversification, correlation among existing and prospective holdings is measured through multiple periods, assigning preference to issues exhibiting low correlation to the portfolio and among sectors. Excess (positive or negative) relative performance also initiates a review of a security by the sub-adviser.

Positions are typically reduced or sold if they exhibit excess valuation, reach sector or position limits, show increased business volatility, are replaced by higher conviction ideas or fail to fulfill the original investment thesis.
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.

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.

Focused Investing – To the extent the fund invests in a limited number of countries, regions, sectors, industries or market segments, in a limited number of issuers, or in issuers in related businesses or that are subject to related operating risks, the fund will be more susceptible to negative events affecting those countries, regions, sectors, industries, segments or issuers, and the value of its shares may be more volatile than if invested more widely. Local events, such as political upheaval, financial troubles, or natural disasters may disrupt a country’s or region’s securities markets. Geographic risk is especially high in emerging markets.

Foreign Investments – Investing in securities of foreign issuers or issuers with significant exposure to foreign markets involves additional risk. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated, less transparent and more volatile than U.S. markets. The value of the fund’s investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable or unsuccessful government actions, reduction of government or central bank support, political or financial instability or other adverse economic or political developments. Lack of information and weaker accounting standards also may affect the value of these securities.

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.

Investments by Affiliated Funds and Unaffiliated Funds – A significant portion of the fund’s shares may be owned by other funds sponsored by Transamerica and/or parties not affiliated with Transamerica. Transactions by these funds may be disruptive to the management of the fund. For example, the fund may experience large redemptions and could be required to sell securities at a time when it may not otherwise desire to do so. Such transactions may increase the fund’s brokerage and/or other transaction costs and could also accelerate the realization of taxable capital gains in the fund. In addition, sizeable redemptions could cause the fund’s total expenses to increase.

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.
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.

Absent any applicable fee waivers and/or expense limitations, performance would be lower.

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.

The fund acquired the assets and assumed the liabilities of The Torray Resolute Fund (the “predecessor fund”) on March 1, 2014, and the predecessor fund was the accounting and performance survivor of the reorganization. This means that the predecessor fund’s performance and financial history have been adopted by the fund. In the reorganization, former shareholders of the predecessor fund received Class I shares of the fund. The performance of Class I shares of the fund includes the performance of the predecessor fund prior to the reorganization. The performance of the predecessor fund has not been restated to reflect the current annual operating expenses of Class I shares. The inception date shown in the table for Class I shares is that of the predecessor fund.

Index returns are since inception of the predecessor fund.
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 I</b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Return
Best Quarter: 03/31/2012 15.66%
Worst Quarter: 12/31/2018 -14.16%
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns (periods ended December 31, 2018) </b>
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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <b>After-tax returns are presented for only one class, and returns for other classes are presented before taxes only and will vary.</b>
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.

After-tax returns are presented for only one class, and returns for other classes are presented before taxes only and will vary.
Retail Class | Transamerica Concentrated Growth | A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.68%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Recaptured expense rr_Component1OtherExpensesOverAssets 0.18% [2]
All other expenses rr_Component2OtherExpensesOverAssets 0.09%
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.20%
1 year rr_ExpenseExampleYear01 $ 666
3 years rr_ExpenseExampleYear03 910
5 years rr_ExpenseExampleYear05 1,173
10 years rr_ExpenseExampleYear10 1,925
1 year rr_ExpenseExampleNoRedemptionYear01 666
3 years rr_ExpenseExampleNoRedemptionYear03 910
5 years rr_ExpenseExampleNoRedemptionYear05 1,173
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,925
1 Year rr_AverageAnnualReturnYear01 (9.40%)
5 Years rr_AverageAnnualReturnYear05
Since Inception rr_AverageAnnualReturnSinceInception 4.76%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2014
Retail Class | Transamerica Concentrated Growth | 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 of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.68%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Recaptured expense rr_Component1OtherExpensesOverAssets none [2]
All other expenses rr_Component2OtherExpensesOverAssets 0.18%
Other expenses rr_OtherExpensesOverAssets 0.18%
Total annual fund operating expenses rr_ExpensesOverAssets 1.86%
1 year rr_ExpenseExampleYear01 $ 289
3 years rr_ExpenseExampleYear03 585
5 years rr_ExpenseExampleYear05 1,006
10 years rr_ExpenseExampleYear10 2,180
1 year rr_ExpenseExampleNoRedemptionYear01 189
3 years rr_ExpenseExampleNoRedemptionYear03 585
5 years rr_ExpenseExampleNoRedemptionYear05 1,006
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,180
1 Year rr_AverageAnnualReturnYear01 (5.61%)
5 Years rr_AverageAnnualReturnYear05
Since Inception rr_AverageAnnualReturnSinceInception 5.26%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2014
Retail Class | Transamerica Concentrated Growth | I  
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 0.68%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Recaptured expense rr_Component1OtherExpensesOverAssets none [2]
All other expenses rr_Component2OtherExpensesOverAssets 0.19%
Other expenses rr_OtherExpensesOverAssets 0.19%
Total annual fund operating expenses rr_ExpensesOverAssets 0.87%
1 year rr_ExpenseExampleYear01 $ 89
3 years rr_ExpenseExampleYear03 278
5 years rr_ExpenseExampleYear05 482
10 years rr_ExpenseExampleYear10 1,073
1 year rr_ExpenseExampleNoRedemptionYear01 89
3 years rr_ExpenseExampleNoRedemptionYear03 278
5 years rr_ExpenseExampleNoRedemptionYear05 482
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,073
2011 rr_AnnualReturn2011 2.23%
2012 rr_AnnualReturn2012 20.28%
2013 rr_AnnualReturn2013 31.84%
2014 rr_AnnualReturn2014 8.12%
2015 rr_AnnualReturn2015 (2.17%)
2016 rr_AnnualReturn2016 6.86%
2017 rr_AnnualReturn2017 24.47%
2018 rr_AnnualReturn2018 (3.81%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.66%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.16%)
1 Year rr_AverageAnnualReturnYear01 (3.81%)
5 Years rr_AverageAnnualReturnYear05 6.24%
Since Inception rr_AverageAnnualReturnSinceInception 10.31%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2010
Retail Class | Transamerica Concentrated Growth | Return after taxes on distributions | I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (6.53%)
5 Years rr_AverageAnnualReturnYear05 4.40%
Since Inception rr_AverageAnnualReturnSinceInception 9.03%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2010
Retail Class | Transamerica Concentrated Growth | Return after taxes on distributions and sale of fund shares | I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.31%)
5 Years rr_AverageAnnualReturnYear05 4.77%
Since Inception rr_AverageAnnualReturnSinceInception 8.31%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2010
Retail Class | Transamerica Concentrated Growth | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.51%) [3]
5 Years rr_AverageAnnualReturnYear05 10.40% [3]
Since Inception rr_AverageAnnualReturnSinceInception 12.61% [3]
[1] Purchases of Class A shares in amounts of $1 million or more that are not subject to an initial sales charge may be subject to a 1.00% contingent deferred sales charge if those shares are redeemed within 24 months of their purchase.
[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 1.20% for Class A shares, 1.95% for Class C shares and, 0.95% for Class I 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.
[3] "Russell®" and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.