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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2018
Transamerica Asset Allocation Long Horizon  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Transamerica Asset Allocation Long Horizon
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks to provide long-term returns from growth of capital and growth of income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses:
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 Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the fund’s performance.

For the period beginning May 19, 2017 and ending October 31, 2017, the portfolio turnover rate for the fund was 35% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 35.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total annual fund operating expenses do not correlate to the ratios of expenses to average net assets in the financial highlights table, which do not include acquired (i.e., underlying) funds’ fees and expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example:
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. Only the 1 year dollar amount shown below reflects TAM's agreement to waive fees and/or reimburse fund expenses. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Transamerica Asset Allocation Long Horizon invests in a combination of Transamerica Funds (“underlying funds”). Transamerica Asset Management, Inc. (the “Investment Manager”) selects the combination and amount of underlying funds to invest in based on the fund’s investment objective.

The following chart shows approximately how much of the assets of the fund are invested in underlying bond, stock and money market funds. These allocations reflect the Investment Manager’s present strategy for asset allocation during normal market conditions, and may be changed at any time without notice to shareholders and without shareholder approval. In the short-term, actual asset allocations may vary due to short-term changes in cash flows caused by purchases and redemptions in the fund.
  Normal Approximate Allocations
  Bond Funds Stock Funds Money Market Fund
Long Horizon 9.8% 90% 0.2%

The underlying bond funds normally invest principally in fixed income securities, the underlying stock funds normally invest principally in equity securities, and the underlying money market fund, Transamerica Government Money Market, normally invests principally in U.S. government securities and/or repurchase agreements collateralized by U.S. government securities. In attempting to respond to adverse market or other conditions or to process a large purchase or redemption within the fund, the Investment Manager may allocate assets of the fund without limit to the underlying money market fund.

Each underlying fund has its own investment objective, principal investment strategies and investment risks. The sub-adviser for each underlying fund decides which securities to purchase and sell for that underlying fund. The fund’s ability to achieve its investment objective depends largely on the performance of the underlying funds in which it invests.

The fund may be a significant shareholder in certain underlying funds.
Risk [Heading] rr_RiskHeading Principal Risks:
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 (either directly or through its investments in underlying funds). Each risk described below may not apply to each underlying fund and an underlying fund may be subject to additional or different risks than those described below. 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.

Asset Allocation – The Investment Manager allocates the fund's assets among various asset classes and underlying funds. These allocations may be unsuccessful in maximizing the fund's return and/or avoiding investment losses, and may cause the fund to underperform.

Asset Class Variation – The underlying funds invest principally in the securities constituting their asset class (i.e., equity or fixed income). However, an underlying fund may vary the percentage of its assets in these securities (subject to any applicable regulatory requirements). Depending upon the percentage of securities in a particular asset class held by the underlying funds at any given time, and the percentage of the fund's assets invested in various underlying funds, the fund's actual exposure to the securities in a particular asset class may vary substantially from its target allocation for that asset class.

Counterparty – The fund will be subject to credit risk (meaning the risk of adverse changes in an issuer’s real or perceived financial strength) with respect to counterparties to derivatives, repurchase agreements and other financial contracts entered into by the fund or held by special purpose or structured vehicles. Adverse changes to counterparties may cause the value of financial contracts to go down. If a counterparty becomes bankrupt or otherwise fails to perform its obligations, the value of your investment in the fund may decline.

Credit – If an issuer or other obligor (such as a party providing insurance or other credit enhancement) of a security held by the fund or a counterparty to a financial contract with the fund defaults or is downgraded, or is perceived to be less creditworthy, or if the value of any underlying assets declines, the value of your investment will typically decline. A decline may be significant, particularly in certain market environments. Below investment grade, high-yield debt securities (commonly known as “junk” bonds) have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.

Currency – The value of investments in securities denominated in foreign currencies increases or decreases as the rates of exchange between those currencies and the U.S. dollar change. Currency conversion costs and currency fluctuations could reduce or eliminate investment gains or add to investment losses. Currency exchange rates can be volatile, and are affected by factors such as general economic conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls, and speculation.

Derivatives – Using derivatives exposes the fund to additional risks and can increase fund losses and reduce opportunities for gains when market prices, interest rates, currencies, or the derivatives themselves, behave in a way not anticipated by the fund. Using derivatives may have a leveraging effect, increase fund volatility and not produce the result intended. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. Derivatives are generally subject to the risks applicable to the assets, rates, indices or other indicators underlying the derivative. The value of a derivative may fluctuate more than, or otherwise not correlate well with, the underlying assets, rates, indices or other indicators to which it relates. Use of derivatives may have different tax consequences for the fund than an investment in the underlying security, and those differences may affect the amount, timing and character of income distributed to shareholders. The U.S. government and foreign governments are in the process of adopting and implementing regulations governing derivatives markets, including mandatory clearing of certain derivatives, margin and reporting requirements. The ultimate impact of the regulations remains unclear. Additional regulation of derivatives may make derivatives more costly, limit their availability or utility, otherwise adversely affect their performance, or disrupt markets. For additional information regarding derivatives, see “More on Risks of Investing in the Funds—More on Principal Risks: Derivatives” in this prospectus. In addition, the SEC has proposed a new rule that would change the regulation of the use of derivatives by registered investment companies, such as the fund. If the proposed rule, or a different rule, takes effect, it could limit the ability of the fund to invest in derivatives.

Emerging Markets – Investments in the securities of issuers located in or principally doing business in emerging markets are subject to heightened foreign investments risks. Emerging market countries tend to have economic, political and legal systems that are less fully developed and are less stable than those of more developed countries. Emerging market securities are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility.

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. Equity securities may have greater price volatility than other asset classes, such as fixed income securities, and fluctuate 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.

Extension – When interest rates rise, repayments of fixed income securities, particularly asset- and mortgage-backed securities, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone. This may cause the fund’s share price to be more volatile or go down.

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 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.

Interest Rate – Interest rates in the U.S. have been at historically low levels and should be expected to go up. The fund faces a heightened risk that interest rates may rise. The value of fixed income securities generally goes down when interest rates rise, and therefore the value of your investment in the fund may also go down. Debt securities have varying levels of sensitivity to changes in interest rates. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions from the fund.

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.

Leveraging – The value of your investment may be more volatile to the extent that the fund borrows or uses derivatives or other investments, such as ETFs, that have embedded leverage. Other risks also will be compounded because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have. The use of leverage is considered to be a speculative investment practice and may result in the loss of a substantial amount, and possibly all, of the fund's assets. The fund also may have to sell assets at inopportune times to satisfy its obligations or meet segregation requirements.

Management – The fund is subject to the risk that the Investment Manager’s judgments and decisions may be incorrect or otherwise may not produce the desired results. The value of your investment may decrease if the Investment Manager’s judgment about the quality, relative yield or value of, or market trends affecting, a particular security or issuer, industry, sector, region or market segment, or about the economy or interest rates, is incorrect. 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, or the analyses employed or relied on, by the Investment Manager, if such tools, resources, information or data are used incorrectly, fail to produce the desired results or otherwise do not work as intended, or if the Investment Manager’s investment style is out of favor or otherwise fails to produce the desired results. The fund’s investment strategies designed by the Investment Manager may not work as intended. 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 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.

The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks have taken steps to support financial markets, including by keeping interest rates at historically low levels. This and other government interventions may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. The Federal Reserve has reduced its market support activities and has begun raising interest rates. Certain foreign governments and central banks are implementing or discussing 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 or contrary actions by different governments 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.

Mortgage-Related and Asset-Backed Securities – The value of mortgage-related and asset-backed securities will be influenced by factors affecting the housing market and the assets underlying such securities. As a result, during periods of declining asset values, difficult or frozen credit markets, swings in interest rates, or deteriorating economic conditions, mortgage-related and asset-backed securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. Mortgage-backed securities may be issued by private issuers, by government-sponsored entities such as Fannie Mae or Freddie Mac or by agencies of the U.S. government, such as Ginnie Mae. Mortgage-backed securities represent direct or indirect participations in, or are collateralized by and payable from, mortgage loans secured by real property. Unlike mortgage-related securities issued or guaranteed by agencies of the U.S. government or government-sponsored entities, mortgage-related securities issued by private issuers do not have a government or government-sponsored entity guarantee (but may have other credit enhancement), and may, and frequently do, have less favorable collateral, credit risk or other underwriting characteristics. Asset-backed securities represent participations in, or are secured by and payable from, assets such as installment sales or loan contracts, leases, credit card receivables and other categories of receivables. The value of mortgage-backed and asset-backed securities may be affected by changes in credit quality or value of the mortgage loans or other assets that support the securities. Mortgage-backed and asset-backed securities are subject to prepayment or call and extension risks. Some of these securities may receive little or no collateral protection from the underlying assets. The risk of default is generally higher in the case of mortgage-backed investments that include so-called “sub-prime” mortgages. The structure of some of these securities may be complex and there may be less information available than for other types of debt securities. Upon the occurrence of certain triggering events or defaults, the fund may become the holder of underlying assets at a time when those assets may be difficult to sell or may be sold only at a loss.

Prepayment or Call – Many issuers have a right to prepay their fixed income securities. Issuers may be more likely to prepay their securities if interest rates fall. If this happens, the fund will not benefit from the rise in the market price of the securities that normally accompanies a decline in interest rates and will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on prepaid securities. The fund may also lose any premium it paid on prepaid securities.

Small and Medium Capitalization Companies – The fund will be exposed to additional risks as a result of its investments in the securities of small or medium capitalization companies. Small or medium capitalization companies may be more at risk than large capitalization companies because, among other things, they may have limited product lines, operating history, market or financial resources, or because they may depend on a limited management group. The prices of securities of small and medium capitalization companies generally are more volatile than those of large capitalization companies and are more likely to be adversely affected than large capitalization companies by changes in earnings results and investor expectations or poor economic or market conditions. Securities of small and medium capitalization companies may underperform large capitalization companies, may be harder to sell at times and at prices the portfolio managers believe appropriate and may offer greater potential for losses.

Underlying Funds – When the fund invests its assets in various underlying funds, its ability to achieve its investment objective depends largely on the performance of the underlying funds in which it invests. Investing in underlying funds subjects the fund to the risks of investing in the underlying securities or assets held by those underlying funds. Each of the underlying funds in which the fund may invest has its own investment risks, and those risks can affect the value of the underlying funds' shares and therefore the value of the fund's investments. There can be no assurance that the investment objective of any underlying fund will be achieved. To the extent that the fund invests more of its assets in one underlying fund than in another, the fund will have greater exposure to the risks of that underlying fund. In addition, the fund will bear a pro rata portion of the operating expenses of the underlying funds in which it invests. See “Appendix A – Asset Allocation Funds” in this prospectus for additional information regarding each underlying fund.

Valuation – The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets, that are priced based upon valuations provided by third-party pricing services that use matrix or evaluated pricing systems, or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued securities or had used a different valuation methodology. The fund's ability to value its investments may be impacted by technological issues and/or errors by pricing services or other third party service providers.

Value Investing – The prices of securities the sub-adviser to an underlying fund believes are undervalued may not appreciate as anticipated or may go down. The value approach to investing involves the risk that stocks may remain undervalued, undervaluation may become more severe, or perceived undervaluation may actually represent intrinsic value. Value 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 “growth” stocks.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money if you invest in this fund.
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 Performance:
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, as well as comparison to one or more secondary indices.

The fund acquired the assets and assumed the liabilities of four Transamerica Partners asset allocation funds, including Transamerica Institutional Asset Allocation - Long Horizon (the “predecessor fund”), on May 19, 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, former 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 reorganizations, and has not been restated to reflect the annual operating expenses of Class R4 shares.

The past performance shown below is for Class R4 shares. Although Class R shares would have similar annual returns as Class R4 shares because the classes are invested in the same combination and amount of underlying funds, the returns for Class R shares will differ from Class R4 shares to the extent that the classes have different expenses. Performance information for Class R shares will be included in a future prospectus after the class has been in operation for one calendar year.

Absent any applicable fee waivers and/or expense limitations, performance would have been 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.
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, as well as comparison to one or more secondary indices.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Performance information for Class R shares will be included in a future prospectus after the class has been in operation for one calendar year.
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 Annual Total Returns (calendar years ended December 31) - Class R4
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Return
Best Quarter: 06/30/2009 16.03%
Worst Quarter: 12/31/2008 -21.99%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (periods ended December 31, 2017)
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 blended benchmark consists of the following: 66% Russell 3000® Index1, 24% MSCI World Index ex-U.S., 4% Bloomberg Barclays US Aggregate Bond Index, 2% Bloomberg Barclays US Treasury Inflation Protected Securities Index, 2% Citigroup 3-Month Treasury Bill Index and 2% BofA Merrill Lynch High Yield Master II Index. Prior to February 1, 2008, the blended benchmark was comprised of 76% Russell 3000® Index, 14% MSCI World Index ex-U.S., 6% Bloomberg Barclays US Aggregate Bond Index, 3% BofA Merrill Lynch 1-3 Year U.S. Treasury Index and 1% BofA Merrill Lynch High Yield Master II Index. The returns of these blended benchmarks have been linked.

1Russell Investment Group is the source and owner of the trademarks, service marks and copyrights related to the Russell indexes. Russell® is a trademark of Russell Investment Group.

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 Asset Allocation Long Horizon | 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 0.12%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets none
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Total annual fund operating expenses rr_ExpensesOverAssets 1.28%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.02% [1]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.26% [2]
1 year rr_ExpenseExampleYear01 $ 128
3 years rr_ExpenseExampleYear03 404
5 years rr_ExpenseExampleYear05 700
10 years rr_ExpenseExampleYear10 $ 1,543
Transamerica Asset Allocation Long Horizon | 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 0.12%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.01%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Total annual fund operating expenses rr_ExpensesOverAssets 1.04%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.03% [1]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.01% [2]
1 year rr_ExpenseExampleYear01 $ 103
3 years rr_ExpenseExampleYear03 328
5 years rr_ExpenseExampleYear05 571
10 years rr_ExpenseExampleYear10 $ 1,268
2008 rr_AnnualReturn2008 (39.15%)
2009 rr_AnnualReturn2009 25.40%
2010 rr_AnnualReturn2010 16.77%
2011 rr_AnnualReturn2011 (3.65%)
2012 rr_AnnualReturn2012 14.36%
2013 rr_AnnualReturn2013 26.33%
2014 rr_AnnualReturn2014 4.55%
2015 rr_AnnualReturn2015 0.63%
2016 rr_AnnualReturn2016 7.07%
2017 rr_AnnualReturn2017 18.48%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.03%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.99%)
1 Year rr_AverageAnnualReturnYear01 18.48%
5 Years rr_AverageAnnualReturnYear05 11.01%
10 Years rr_AverageAnnualReturnYear10 5.17%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2000
Transamerica Asset Allocation Long Horizon | Return after taxes on distributions | R4  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.96%
5 Years rr_AverageAnnualReturnYear05 10.32%
10 Years rr_AverageAnnualReturnYear10 4.55%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2000
Transamerica Asset Allocation Long Horizon | Return after taxes on distributions and sale of fund shares | R4  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.68%
5 Years rr_AverageAnnualReturnYear05 8.41%
10 Years rr_AverageAnnualReturnYear10 3.81%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 11, 2000
Transamerica Asset Allocation Long Horizon | S&P 500® (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.79%
10 Years rr_AverageAnnualReturnYear10 8.50%
Transamerica Asset Allocation Long Horizon | Transamerica Asset Allocation Long Horizon Blended Benchmark (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.17%
5 Years rr_AverageAnnualReturnYear05 12.40%
10 Years rr_AverageAnnualReturnYear10 6.82%
[1] Contractual arrangements have been made with the fund’s investment manager, Transamerica Asset Management, Inc. (“TAM”), through March 1, 2019 to waive fees and/or reimburse fund expenses to the extent that total annual fund operating expenses exceed 0.60% for Class R shares and 0.35% for Class R4 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, 2019 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.
[2] Total annual fund operating expenses do not correlate to the ratios of expenses to average net assets in the financial highlights table, which do not include acquired (i.e., underlying) funds’ fees and expenses.