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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2020
Retail Class | Transamerica Dynamic Income  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Transamerica Dynamic Income
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks high current income as the primary objective
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock with capital appreciation as a secondary objective.
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.

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 298 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 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, 2021
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.

During the most recent fiscal year, the portfolio turnover rate for the fund was 20% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.00%
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
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired fund fees and expenses are not included in the calculation of the ratios of expenses to average net assets shown in the Financial Highlights section of the fund’s prospectus.
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 (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. 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:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If the shares are redeemed at the end of each period:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If the shares are not redeemed:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund’s sub-adviser, QS Investors, LLC (the “sub-adviser”), seeks to achieve the fund’s objective by investing primarily in a combination of underlying exchange-traded funds (“ETFs”).

The sub-adviser utilizes a dynamic optimization approach that seeks to maximize current income though the use of a proprietary quantitative model. The dynamic optimization approach periodically reallocates the portfolio’s assets in an effort to maximize income, within the context of the level of risk taken. The model is used as a tool by the sub-adviser in seeking to achieve the fund’s objective, however the sub-adviser has the ability to use discretion throughout the portfolio implementation process.

The sub-adviser’s asset allocation strategy involves making adjustments to the fund’s asset mix, utilizing among other things the sub-adviser’s research on various risk and income considerations, in an effort to maximize yields relative to risks as market and economic conditions change. The sub-adviser’s selections of individual ETFs in a given asset class may be driven by income, risk, diversification, liquidity, fees, or other investment considerations.

Under normal circumstances, the fund’s equity allocation will generally vary between approximately 30% and 35% of its net assets. The equity allocation normally involves a combination of domestic and non-U.S. ETFs, consisting of any mixture of large, medium and small-cap styles and pursuing growth or value strategies. The fund’s allocation to non-U.S. equity ETFs will generally not exceed more than 18% of the total net assets of the fund. The fund’s allocation to bond ETFs (which may include domestic and non-U.S. government, corporate, high yield and structured bonds, including emerging markets) will generally vary between approximately 65% and 70% of net assets. The sum of the fund’s allocation to high yield (commonly known as “junk bonds”) and emerging market fixed income asset classes will generally not exceed 60% of the fund’s net assets. The fund’s allocation to non-U.S. fixed income ETFs will generally not exceed 35% of the net assets of the fund.

The sub-adviser dynamically rebalances assets on a monthly basis and rotates the fund’s assets semi-annually, or as needed dependent upon market conditions, among various asset classes in an effort to take advantage of changing conditions that the sub-adviser believes favor one asset class over another. Based on the analysis of risk and income characteristics, the sub-adviser will increase the allocation to the asset classes that the sub-adviser believes have a higher probability of contributing to a higher yield at a reasonable risk level. The investment process incorporates a limit of 20% to any single ETF and also employs diversification measures in an effort to ensure the fund includes exposure to multiple asset classes.

The sub-adviser uses a largely quantitative process to seek an income focused portfolio that has a high yield and corresponds to a desired risk level. As part of the investment process, the sub-adviser defines a universe of ETFs that generate regular income and then estimates the yield on each ETF. The sub-adviser incorporates various inputs focused on income and risk into the model and includes constraints and metrics that limit asset class exposures to ensure portfolio diversification. The sub-adviser may exercise its judgment in managing the fund and may, in its discretion, adjust, change, or even disregard the quantitative model at any time. The desired output of the process is a well-diversified income portfolio.

It is the fund's goal to pay a monthly dividend that is generally consistent in amount based on current market conditions, including current interest rates. The dividend will be calculated based on estimates of expected dividends from the fund’s holdings. Actual dividends received by the fund may vary from the estimates, and subsequent monthly dividends will be adjusted accordingly.

Each underlying ETF has its own investment objective, principal investment strategies and investment risks. It is not possible to predict the extent to which the fund will be invested in a particular underlying ETF at any time. The fund may be a significant shareholder in certain underlying ETFs. The sub-adviser may change the fund’s asset allocations and underlying ETFs at any time without investor approval and without notice to investors.
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Risk is inherent in all investing. Many factors and risks affect the fund's performance, including those described below. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly day to day and over time. 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 fund, through its investments in underlying funds, is subject to the risks of the underlying funds. The following is a summary description of principal risks (in alphabetical order after certain key risks) 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.

Market – The market prices of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as overall economic trends or events, government actions or interventions, market disruptions caused by trade disputes or other factors, political factors or adverse investor sentiment. The market prices of securities also may go down due to events or conditions that affect particular sectors, industries or issuers. Adverse market conditions may be prolonged and may not have the same impact on all types of securities. If the market prices 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.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, terrorism, technology and data interruptions, natural disasters and other circumstances in one country or region could be highly disruptive to, and have profound impacts on, global economies or markets. During periods of market disruption, the fund's exposure to the risks described elsewhere in this summary will likely increase. 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.

Tactical and Strategic Asset Allocation – The  fund’s tactical asset allocation strategy involves making short-term adjustments to the fund’s asset mix, utilizing the sub-adviser’s research on various risk and return considerations, in an effort to optimize returns relative to risks as market and economic conditions change. The fund’s strategic asset allocation strategy is similar, but with a somewhat longer-term outlook. These strategies tend to produce higher turnover than those that adhere to a longer term outlook, which may result in higher transaction costs. These strategies may not work as intended. The fund may not achieve its objective and may not perform as well as other funds using other asset management strategies.

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.

Underlying Exchange-Traded Funds – Because the fund invests its assets in underlying ETFs, its ability to achieve its investment objective depends largely 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.

Interest Rate – Interest rates in the U.S. and certain foreign markets have been low relative to historic levels. The fund faces a 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 significant or rapid rise in rates may result in losses. Changes in interest rates may affect the liquidity and value of the fund’s investments. 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. If the fund holds variable or floating rate securities, a decrease in interest rates will adversely affect the income received from such securities and the value of the fund’s shares.

Fixed-Income Securities – Fixed-income securities are subject to risks including credit risk, interest rate risk, counterparty risk, prepayment risk, extension risk, valuation risk, and liquidity risk. The value of fixed-income securities may go up or down, sometimes rapidly and unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, tariffs and trade disruptions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. In addition, the value of a fixed-income security may decline if the issuer or other obligor of the security fails to pay principal and/or interest, otherwise defaults or has its credit rating downgraded or is perceived to be less creditworthy, or the credit quality or value of any underlying assets declines. If the value of fixed-income securities owned by the fund falls, the value of your investment will go down. The prices of fixed-income securities will generally go down when interest rates rise. Interest rates in the U.S. and certain foreign markets have been low relative to historic levels, so the fund faces a risk that interest rates may rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities.

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, factors affecting a particular industry or industries, 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, and the fund may lose its entire investment in the company.

Allocation – The fund’s ability to achieve its investment objectives depends, in large part, upon the sub-adviser’s skill in determining the fund’s asset class allocation and reallocation from time to time, deciding whether and when to tactically overweight or underweight asset classes and selecting a mix of underlying funds. These actions may be unsuccessful in maximizing return and/or avoiding investment losses. The value of your investment may decrease if the sub-adviser’s judgment about the attractiveness, value or market trends affecting a particular asset class, investment style, technique or strategy, underlying fund or other issuer is incorrect. The available underlying funds selected by the sub-adviser may underperform the market or similar funds.

Management – The value of your investment may go down if the investment manager’s or sub-adviser's judgments and decisions are incorrect or otherwise do not produce the desired results. You 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. The fund’s investment strategies may not work as intended or otherwise fail to produce the desired results. Any of these things could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.

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.

Asset Class Variation – The underlying funds invest principally in the securities constituting their asset class (i.e., equity or fixed income) or underlying index components. 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 the risk that the counterparties to derivatives, repurchase agreements and other financial contracts entered into by the fund or held by special purpose or structured vehicles in which the fund invests will not fulfill their contractual obligations. Adverse changes to counterparties (including derivatives exchanges and clearinghouses) 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. In addition, the fund may incur costs and may be hindered or delayed in enforcing its rights against a counterparty.

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 is unable or unwilling to meet its financial obligations 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. In addition, the fund may incur costs and may be hindered or delayed in enforcing its rights against an issuer, obligor or counterparty. The degree of credit risk of a security or financial contract depends upon, among other things, the financial condition of the issuer and the terms of the security or contract.

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. U.S. dollar-denominated securities of foreign issuers may also be affected by currency risk, as the revenue earned by issuers of these securities may also be impacted by changes in the issuer’s local currency. Currency conversion costs and currency fluctuations could reduce or eliminate investment gains or add to investment losses. Currency exchange rates can be volatile and may fluctuate significantly over short periods of time, 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. A fund may be unable or may choose not to hedge its foreign currency exposure.

Derivatives – Derivatives involve special risks and costs and may result in losses to the fund. Using derivatives exposes the fund to additional or heightened risks, including leverage risk, liquidity risk, valuation risk, market risk, counterparty risk and credit risk. Their usage can increase fund losses and reduce opportunities for gains when market prices or volatility, interest rates, currencies, or the derivatives themselves, behave in a way not anticipated. 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. Even a small investment in derivatives can have a disproportionate impact on the fund. Derivatives may be difficult to sell, unwind or value, and the counterparty (including, if applicable, the fund’s clearing broker, the derivatives exchange or the clearinghouse) may default on its obligations to the fund. In certain cases, the fund may incur costs and may be hindered or delayed in enforcing its rights against or closing out derivatives instruments with a counterparty, which may result in additional losses. Derivatives are subject to additional risks such as operational risk, including settlement issues, and legal risk, including that underlying documentation is incomplete or ambiguous. Derivatives are also generally subject to the risks applicable to the assets, rates, indices or other indicators underlying the derivative, including market risk, credit risk, liquidity risk, management and valuation risk. Also, suitable derivative transactions may not be available in all circumstances. The value of a derivative may fluctuate more or less than, or otherwise not correlate well with, the underlying assets, rates, indices or other indicators to which it relates. The fund may be required to segregate or earmark liquid assets or otherwise cover its obligations under derivatives transactions and may have to liquidate positions before it is desirable in order to meet these segregation and coverage requirements. Use of derivatives may have different tax consequences for the fund than an investment in the underlying assets or indices, and those differences may affect the amount, timing and character of income distributed to shareholders.

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 and regulatory and accounting standards that are less developed, and that can be expected to be less stable. For example, the economies of such countries can be subject to rapid and unpredictable rates of inflation or deflation, and may be based on only a few industries. Emerging market countries may have policies that restrict investment by foreigners or that prevent foreign investors such as the fund from withdrawing their money at will. 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 extreme price volatility. An investment in emerging market securities should be considered speculative.

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.

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 it invested more widely. Local events, such as political upheaval, social unrest, wars and terror attacks, financial troubles, pandemics, epidemics and natural disasters may disrupt a country’s or region’s securities markets. Geographic risk is especially high in emerging and frontier markets.

Foreign Investments – Investing in securities of foreign issuers or issuers with significant exposure to foreign markets involves additional risks. Foreign markets can be less liquid, less regulated, less transparent and more volatile than U.S. markets. The value of the fund’s foreign 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, tariffs and trade disruptions, political or financial instability, social unrest or other adverse economic or political developments. Lack of information and weaker legal systems and accounting standards also may affect the value of these securities. Foreign investments may have lower liquidity and be more difficult to value than investments in U.S. issuers.

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 and may involve larger price swings 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.

High-Yield Debt Securities – High-yield debt securities, commonly referred to as “junk” bonds, are securities that are rated below “investment grade” or, if unrated, determined to be below investment grade by the sub-adviser. Issuers of junk bonds are typically in weaker financial health. Changes in interest rates, the market’s perception of the issuers, the creditworthiness of the issuers and negative perceptions of the junk bond market generally may significantly affect the value of these bonds. Junk bonds are considered speculative, have a higher risk of default, tend to be less liquid and may be more difficult to value than higher grade securities, and they may result in losses for the fund. Junk bonds tend to be volatile and more susceptible to adverse events, credit downgrades and negative sentiments.

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 or coverage requirements.

Liquidity – The fund may make investments that are illiquid or that become illiquid after purchase. Illiquid investments can be difficult to value, may trade at a discount from comparable, more liquid investments, and may be subject to wide fluctuations in value. As a general matter, a reduction in the willingness or ability of dealers and other institutional investors to make markets in fixed income securities may result in even less liquidity in certain markets. If the fund is forced to sell an illiquid investment to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of less liquid or illiquid securities for an extended period (for example, several weeks or even longer), and such sale may involve additional costs. Liquidity of particular investments, or even an entire market segment, can deteriorate rapidly, particularly during times of market turmoil, and those investments may be difficult or impossible for the fund to sell. This may prevent the fund from limiting losses.

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, which could negatively impact the fund. 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.

Real Estate Securities – Investments in the real estate industry are subject to risks associated with direct investment in real estate. These risks include declines in the value of real estate, adverse general and local economic conditions, increased competition, overbuilding and changes in laws and regulations affecting real estate, operating expenses, property taxes and interest rates. If the fund’s real estate-related investments are concentrated in one geographic area or one property type, the fund will also be subject to the risks associated with that one area or property type. The value of the fund’s real estate-related securities will not necessarily track the value of the underlying investments of the issuers of such securities.

REITs – Investing in real estate investment trusts (“REITs”) involves unique risks. When the fund invests in REITs, it is subject to risks generally associated with investing in real estate. A REIT’s performance depends on the types and locations of the properties it owns, how well it manages those properties and cash flow. REITs may have limited financial resources, may trade less frequently and in limited volume, may engage in dilutive offerings, and may be subject to more abrupt or erratic price movements than the overall securities markets. In addition to its own expenses, the fund will indirectly bear its proportionate share of any management and other expenses paid by REITs in which it invests. U.S. REITs are subject to a number of highly technical tax-related rules and requirements; and a U.S. REIT’s failure to qualify for the favorable U.S. federal income tax treatment generally available to U.S. REITs could result in corporate-level taxation, significantly reducing the return on an investment to the fund.

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.

Sovereign Debt – Sovereign debt instruments are subject to the risk that the governmental entity may delay or fail to pay interest or repay principal on its sovereign debt. If a governmental entity defaults, it may ask for more time in which to pay or for further loans, or the debt may be restructured. There may be no established legal process for collecting sovereign debt that a government does not pay, nor are there bankruptcy proceedings through which all or part of the sovereign debt that a governmental entity has not repaid may be collected.

Structured Instruments – The fund may invest in, or have exposure to, various types of structured instruments, including securities that have demand, tender or put features, or interest rate reset features. Structured instruments are a type of derivative instrument and the payment and credit qualities of these instruments derive from the assets embedded in the structure from which they are issued. Structured instruments may be leveraged and may behave in ways not anticipated by the fund, or they may not receive tax, accounting or regulatory treatment anticipated by the fund. Structured instruments may also be less liquid and more difficult to value accurately than more traditional securities and instruments.

U.S. Government and 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. government 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. A security backed by the “full faith and credit” of the U.S. government is guaranteed only as to its stated interest rate and face value at maturity, not its current market price.

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 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 bar chart does not reflect the impact of sales charges, which, if reflected, would lower the returns. The table includes deduction of applicable sales charges.

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.

Prior to May 1, 2015, the fund was named Transamerica Tactical Income, had a different sub-adviser 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, as well as comparison to one or more secondary indices.
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 A
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges, which, if reflected, would lower the returns.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Return
Best Quarter: 6/30/2016 7.82%
Worst Quarter: 9/30/2015 -6.00%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (periods ended December 31, 2019)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The table includes deduction of applicable sales charges.
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 After-tax returns are presented for only one class, and returns for other classes are presented before taxes only and will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The Transamerica Dynamic Income Blended Benchmark consists of the following: iBoxx $ Liquid High Yield Index, 40%, Bloomberg Barclays US Aggregate Bond Index, 30% and S&P 500®, 30%. Calculations assume dividends and capital gains are reinvested and do not include any managerial expenses.

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 Dynamic Income | A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
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 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.24%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.34% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.33%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.07% [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.26%
1 year rr_ExpenseExampleYear01 $ 597
3 years rr_ExpenseExampleYear03 870
5 years rr_ExpenseExampleYear05 1,163
10 years rr_ExpenseExampleYear10 1,995
1 year rr_ExpenseExampleNoRedemptionYear01 597
3 years rr_ExpenseExampleNoRedemptionYear03 870
5 years rr_ExpenseExampleNoRedemptionYear05 1,163
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,995
2012 rr_AnnualReturn2012 8.19%
2013 rr_AnnualReturn2013 4.48%
2014 rr_AnnualReturn2014 4.55%
2015 rr_AnnualReturn2015 (7.91%)
2016 rr_AnnualReturn2016 11.38%
2017 rr_AnnualReturn2017 6.98%
2018 rr_AnnualReturn2018 (5.50%)
2019 rr_AnnualReturn2019 12.38%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.00%)
1 Year rr_AverageAnnualReturnYear01 7.06%
5 Years rr_AverageAnnualReturnYear05 2.11%
Since Inception rr_AverageAnnualReturnSinceInception 3.51%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2011
Retail Class | Transamerica Dynamic Income | 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 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.24%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.34% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 2.08%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.07% [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 2.01%
1 year rr_ExpenseExampleYear01 $ 304
3 years rr_ExpenseExampleYear03 645
5 years rr_ExpenseExampleYear05 1,112
10 years rr_ExpenseExampleYear10 2,405
1 year rr_ExpenseExampleNoRedemptionYear01 204
3 years rr_ExpenseExampleNoRedemptionYear03 645
5 years rr_ExpenseExampleNoRedemptionYear05 1,112
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,405
1 Year rr_AverageAnnualReturnYear01 10.60%
5 Years rr_AverageAnnualReturnYear05 2.35%
Since Inception rr_AverageAnnualReturnSinceInception 3.35%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2011
Retail Class | Transamerica Dynamic Income | 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 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.22%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.34% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.06%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.05% [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.01%
1 year rr_ExpenseExampleYear01 $ 103
3 years rr_ExpenseExampleYear03 332
5 years rr_ExpenseExampleYear05 580
10 years rr_ExpenseExampleYear10 1,290
1 year rr_ExpenseExampleNoRedemptionYear01 103
3 years rr_ExpenseExampleNoRedemptionYear03 332
5 years rr_ExpenseExampleNoRedemptionYear05 580
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,290
1 Year rr_AverageAnnualReturnYear01 12.67%
5 Years rr_AverageAnnualReturnYear05 3.36%
Since Inception rr_AverageAnnualReturnSinceInception 4.37%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2011
Retail Class | Transamerica Dynamic Income | Return after taxes on distributions | A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.60%
5 Years rr_AverageAnnualReturnYear05 0.36%
Since Inception rr_AverageAnnualReturnSinceInception 1.70%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2011
Retail Class | Transamerica Dynamic Income | Return after taxes on distributions and sale of fund shares | A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.28%
5 Years rr_AverageAnnualReturnYear05 0.83%
Since Inception rr_AverageAnnualReturnSinceInception 1.92%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2011
Retail Class | Transamerica Dynamic Income | iBoxx $ Liquid High Yield Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.65%
5 Years rr_AverageAnnualReturnYear05 5.63%
Since Inception rr_AverageAnnualReturnSinceInception 6.14%
Retail Class | Transamerica Dynamic Income | Transamerica Dynamic Income Blended Benchmark (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.78%
5 Years rr_AverageAnnualReturnYear05 6.77%
Since Inception rr_AverageAnnualReturnSinceInception 7.70%
[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] Acquired fund fees and expenses reflect the fund’s pro rata share of the fees and expenses incurred by investing in other investment companies. Acquired fund fees and expenses are not included in the calculation of the ratios of expenses to average net assets shown in the Financial Highlights section of the fund’s prospectus.
[3] Contractual arrangements have been made with the fund’s investment manager, Transamerica Asset Management, Inc. (“TAM”), through March 1, 2021 to waive fees and/or reimburse fund expenses to the extent that total annual fund operating expenses exceed 0.92% for Class A shares, 1.67% for Class C shares, and 0.67% 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, 2021 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’ 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.