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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2020
Retail Class | Transamerica Emerging Markets Opportunities  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Transamerica Emerging Markets Opportunities
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks long-term capital appreciation.
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. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the fund's performance.

Portfolio turnover rate is not included at this time because the fund did not commence operations until after the most recent fiscal year-end.
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
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses are based on estimates for the current fiscal year.
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Acquired fund fees and expenses are estimated for the current fiscal year and reflect the fund’s pro rata share of the fees and expenses incurred by investing in other investment companies.
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 Under normal circumstances, the fund’s sub-adviser, Wellington Management Company LLP (the “sub-adviser”), will invest at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in equity securities (including American Depository Receipts (“ADRs”), Global Depository Receipts (“GDRs”) and European Depository Receipts (“EDRs”)) of companies that are located and/or conduct substantial business activities in emerging markets, including frontier markets. Emerging markets are those countries (1) included in emerging market or equivalent classifications by the United Nations (and its agencies); (2) having per capita income in the low to middle ranges, as determined by the World Bank; or (3) designated by the fund’s benchmark index provider as emerging. The fund will normally invest primarily in emerging market companies which the sub-adviser believes have above-average potential for capital appreciation based on its “bottom up” fundamental research and analysis.

Emerging market countries may be found in regions such as Asia, Latin America, Eastern Europe, the Middle East, and Africa. Many emerging market securities are denominated in currencies other than the U.S. dollar.

The sub-adviser will seek to develop a portfolio that is generally broadly diversified across issuers, countries, industries and styles. The fund’s portfolio may include stocks that are considered to be either growth stocks or value stocks. Because the sub-adviser’s process is driven primarily by individual stock selection, the overall portfolio’s yield, price-to-earnings ratio, price-to-book ratio, growth rate and other characteristics will vary over time and, at any given time, the fund may emphasize either growth stocks or value stocks.

The fund may invest in securities of foreign issuers in the form of depositary receipts or other securities that are convertible into securities of foreign issuers. The sub-adviser will generally invest in mid and large capitalization companies. The sub-adviser considers such companies to be those with market capitalizations in the top 95th percentile of the MSCI Emerging Markets Index, the fund’s benchmark index. The market capitalization range of the MSCI Emerging Markets Index was $97 million to $350 billion, as of December 31, 2019, and is expected to change frequently.

The fund’s sub-adviser will not typically utilize derivatives with the exception of purchasing futures for cash equitization purposes or market access products in an effort to achieve efficient investment exposure (i.e., instances where local markets may not be available for trading). Market access products can include warrants on equities, options on equities and equity swaps. The fund may also invest in exchange-traded funds for these purposes.

The fund may invest in China A-shares (equity securities of Chinese companies) listed and traded on stock exchanges such as the Shanghai Stock Exchange or the Shenzhen Stock Exchange.
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 following is a summary description of principal risks (in alphabetical order after certain key risks) of investing in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You may lose money if you invest in this fund.

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.

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.

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.

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.

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.

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.

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.

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.

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.

China A–Shares – The fund may invest in equity securities of certain Chinese companies, referred to as China A-shares, through the Shanghai-Hong Kong Stock Connect program or the Shenzhen-Hong Kong Stock Connect program (collectively, the “Programs”). The Programs are securities trading and clearing linked programs between either the Shanghai Stock Exchange or Shenzhen Stock Exchange, and the Stock Exchange of Hong Kong Limited, Hong Kong Securities Clearing Company Limited, and China Securities Depository and Clearing Corporation Limited, with an aim to achieve mutual stock market access between the People’s Republic of China (“China”) and Hong Kong. The Programs are subject to daily quota limitations, which may restrict the fund’s ability to invest in China A-shares through the Programs and to enter into or exit trades on a timely basis. The Shanghai and Shenzhen markets may be open at a time when the Programs are not trading, with the result that prices of China A-shares may fluctuate at times when the fund is unable to add to or exit its position. Only certain China A-shares are eligible to be accessed through the Programs. Such securities may lose their eligibility at any time, in which case they could be sold but could no longer be purchased through the Programs. Because the Programs are in their early stages, the actual effect on the market for trading China A-shares with the introduction of large numbers of foreign investors is currently unknown. The Programs are subject to regulations promulgated by regulatory authorities for the Shanghai Stock Exchange, the Stock Exchange of Hong Kong Limited and the Shenzhen Stock Exchange, and existing and additional regulations or restrictions, such as limitations on redemptions, suspension of trading and limitations on profits, may adversely impact the Programs and/or the fund’s investments through the Programs. There is no guarantee that all three exchanges will continue to support the Programs in the future.

Investments in China A-shares are subject to risks specific to the China market. Any significant change in mainland China’s political, social or economic policies may have a negative impact on investments in the China market. The regulatory and legal framework for capital markets in mainland China may not be as well developed as those of developed countries. Chinese accounting standards and practices may deviate significantly from international accounting standards. The settlement and clearing systems of the Chinese securities markets may not be well tested and may be subject to increased risks of error or inefficiency.

In addition, uncertainties in China tax rules governing taxation of income and gains from investments in China A-Shares via the Programs could result in unexpected tax liabilities for a fund and therefore could affect the amount of income which may be derived, and the amount of capital returned, from the investments in China A-shares by the fund.

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

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.

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

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.

Frontier Markets – Frontier market countries generally have smaller economies and even less developed capital markets than emerging market countries, and, as a result, the risks of investing in emerging market countries are magnified in frontier market countries. The magnification of risks are the result of: potential for extreme price volatility and illiquidity in frontier markets; government ownership or control of parts of private sector and of certain companies; trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which frontier market countries trade; and the relatively new and unsettled securities laws in many frontier market countries.

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.

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

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

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.

Medium Capitalization Companies – The fund will be exposed to additional risks as a result of its investments in the securities of medium capitalization companies. Investing in medium capitalization companies involves greater risk than is customarily associated with more established companies. The prices of securities of medium capitalization companies generally are more volatile and are more likely to be adversely affected by changes in earnings results and investor expectations or poor economic or market conditions. Securities of medium capitalization companies may underperform larger capitalization companies, may be harder to sell at times and at prices the portfolio managers believe appropriate and may offer greater potential for losses.

New Fund – The fund was recently formed. Investors in the fund bear the risk that the sub-adviser may not be successful in implementing its investment strategy, and may not employ a successful investment strategy, or that the fund may fail to attract sufficient assets under management to realize economies of scale, any of which could result in the fund being liquidated at any time without shareholder approval and at a time that may not be favorable for shareholders.

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

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

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.

Warrants and Rights – Warrants and rights may be considered more speculative than certain other types of investments because they do not entitle a holder to the dividends or voting rights for the securities that may be purchased, and they do not represent any rights in the assets of the issuing company. If the warrant is not exercised before the expiration date, it generally expires without any value and the fund will lose any amount it paid for the warrant.
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 No performance is shown for the fund. Performance information will appear in a future version of this prospectus once the fund has a full calendar year of performance information to report to investors.

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 One Year or Less [Text] rr_PerformanceOneYearOrLess Performance information will appear in a future version of this prospectus once the fund has a full calendar year of performance information to report to investors.
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/
Retail Class | Transamerica Emerging Markets Opportunities | A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.83%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.10% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.20%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.20%
1 year rr_ExpenseExampleYear01 $ 666
3 years rr_ExpenseExampleYear03 910
5 years rr_ExpenseExampleYear05 1,173
10 years rr_ExpenseExampleYear10 1,925
1 year rr_ExpenseExampleNoRedemptionYear01 666
3 years rr_ExpenseExampleNoRedemptionYear03 910
5 years rr_ExpenseExampleNoRedemptionYear05 1,173
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,925
Retail Class | Transamerica Emerging Markets Opportunities | 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 0.83%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.10% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.95%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.95%
1 year rr_ExpenseExampleYear01 $ 298
3 years rr_ExpenseExampleYear03 612
5 years rr_ExpenseExampleYear05 1,052
10 years rr_ExpenseExampleYear10 2,275
1 year rr_ExpenseExampleNoRedemptionYear01 198
3 years rr_ExpenseExampleNoRedemptionYear03 612
5 years rr_ExpenseExampleNoRedemptionYear05 1,052
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,275
Retail Class | Transamerica Emerging Markets Opportunities | 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 0.83%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.20% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.05%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.05% [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.00%
1 year rr_ExpenseExampleYear01 $ 102
3 years rr_ExpenseExampleYear03 329
5 years rr_ExpenseExampleYear05 575
10 years rr_ExpenseExampleYear10 1,278
1 year rr_ExpenseExampleNoRedemptionYear01 102
3 years rr_ExpenseExampleNoRedemptionYear03 329
5 years rr_ExpenseExampleNoRedemptionYear05 575
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,278
Retail Class | Transamerica Emerging Markets Opportunities | R6  
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 0.83%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.11% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.96%
1 year rr_ExpenseExampleYear01 $ 98
3 years rr_ExpenseExampleYear03 306
5 years rr_ExpenseExampleYear05 531
10 years rr_ExpenseExampleYear10 1,178
1 year rr_ExpenseExampleNoRedemptionYear01 98
3 years rr_ExpenseExampleNoRedemptionYear03 306
5 years rr_ExpenseExampleNoRedemptionYear05 531
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,178
[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] Other expenses are based on estimates for the current fiscal year.
[3] Acquired fund fees and expenses are estimated for the current fiscal year and reflect the fund’s pro rata share of the fees and expenses incurred by investing in other investment companies.
[4] 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 1.55% for Class A shares, 2.30% for Class C shares, 0.98% for Class I shares and 0.95% for Class R6 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.