Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	TRANSAMERICA FUNDS
Prospectus Date	rr_ProspectusDate	Mar. 01, 2022
Retail Class | Transamerica Energy Infrastructure
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="font-family:Times New Roman;font-size:11pt;font-weight:bold;">Transamerica Energy Infrastructure</span> <br/><span style="font-family:Times New Roman;font-size:11pt;font-weight:bold;">(formerly, Transamerica MLP & Energy Income)</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Investment Objective:</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Seeks long-term growth of capital while providing current income.
Expense [Heading]	rr_ExpenseHeading	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Fees and Expenses:</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.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 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	<span style="font-family:Times New Roman;font-size:9pt;font-weight:bold;margin-left:0%;">Shareholder Fees (fees paid directly from your investment)</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="font-family:Times New Roman;font-size:9pt;font-weight:bold;margin-left:0%;">Annual Fund Operating Expenses (expenses that you pay each </span><span style="font-family:Times New Roman;font-size:9pt;font-weight:bold;">year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="font-family:Times New Roman;font-size:8pt;">March 1, 2023</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Portfolio Turnover:</span>
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 18% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	18.00%
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. A deferred sales charge on Class A and C shares may apply to certain redemptions of shares purchased by exchange from another Transamerica Fund.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="font-family:Times New Roman;font-size:10pt;margin-left:7.00%;">You may qualify for sales charge discounts if you and your </span><span style="font-family:Times New Roman;font-size:10pt;">family invest, or agree to invest in the future, at least </span><span style="font-family:Times New Roman;font-size:10pt;">$50,000</span><span style="font-family:Times New Roman;font-size:10pt;"> in Transamerica Funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	<span style="font-family:Times New Roman;font-size:8pt;">Management fees have been restated to reflect a reduction in management fees effective June 1, 2021.</span><span style="font-family:Times New Roman;font-size:8pt;">Other expenses have been revised to reflect current transfer agency fees with respect to Class I.</span>
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Example:</span>
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	<span style="font-family:Times New Roman;font-size:9pt;font-weight:bold;margin-left:0%;">If the shares are redeemed at the end of each period:</span>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<span style="font-family:Times New Roman;font-size:9pt;font-weight:bold;">If the shares are not redeemed:</span>
Strategy [Heading]	rr_StrategyHeading	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Principal Investment Strategies:</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the fund’s sub-adviser, Kayne Anderson Capital Advisors, L.P. (the “sub-adviser”), seeks to achieve the fund’s stated objective by investing at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in the equity and debt securities of energy infrastructure companies. The fund considers energy infrastructure companies to include midstream companies (such as master limited partnerships (“MLPs”) and US and Canadian midstream corporations), renewable energy infrastructure companies and other issuers in the energy sector.Midstream companies are companies that own and operate assets used in energy logistics, including transporting, storing, gathering, processing, distributing, or marketing of natural gas, natural gas liquids, crude oil or refined products.Renewable energy infrastructure companies include utilities, independent power producers, developers and other companies that own, provide services for or operate any assets used in the generation, production, distribution, transportation, storage and marketing of renewable energy, including, but not limited to, solar, wind, hydroelectric, geothermal and biomass power.The sub-adviser considers the “energy sector” to consist of companies involved in exploring, developing, producing, generating, transporting, transmitting, storing, gathering, processing, refining, distributing, mining or marketing of natural gas, natural gas liquids, crude oil, refined products, electricity or renewable energy (“energy-related assets”). Investments in other issuers in the energy sector will consist of companies that own, operate or provide services to energy-related assets.Investments by the fund may include securities of any capitalization that are publicly traded on an exchange or in the over-the-counter market.The fund may invest no more than 20% of its total assets in the debt securities of issuers in the energy sector, and no more than 10% of its total assets in debt securities that are rated below investment grade (commonly known as “junk bonds”), including defaulted securities.The fund may directly invest up to, but not more than, 25% of its total assets in equity or debt securities of MLPs and other entities that are treated as qualified publicly traded partnerships for federal income tax purposes.The fund may invest in long or short positions using call or put options. The sub-adviser may take long and short positions in an effort to provide some protection in down markets when compared to a fund that takes only long positions. The fund may also invest in foreign securities, but generally will not invest more than 25% of fund assets in foreign securities.Options trading is not a core strategy of the fund but may be used by the sub-adviser to monetize existing positions when price targets are reached, to generate income or for hedging purposes.The fund may invest a significant portion of its assets in cash, cash equivalent securities or short-term debt securities, repurchase agreements and money market instruments to serve as collateral for the positions the fund takes, to earn income, and for cash management purposes.The above investment restrictions apply at the time of purchase, and the fund will not be required to reduce a position due solely to market value fluctuations in order to comply with these restrictions.The fund is non-diversified.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	<span style="font-family:Times New Roman;font-size:10pt;"> Under normal circumstances, the fund’s sub-adviser, Kayne Anderson Capital Advisors, L.P. (the “sub-adviser”), seeks to achieve the fund’s stated objective by investing at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in the equity and debt securities of energy infrastructure companies. The fund considers energy infrastructure companies to include midstream companies (such as master limited partnerships (“MLPs”) and US and Canadian midstream corporations), renewable energy infrastructure companies and other issuers in the energy sector.</span>
Risk [Heading]	rr_RiskHeading	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Principal Risks:</span>
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 or other assets may go up or down, sometimes rapidly or unpredictably, due to general market conditions, overall economic trends or events, inflation, changes in interest rates, governmental actions or interventions, actions taken by the U.S. Federal Reserve or foreign central banks, market disruptions caused by tariffs, trade disputes or other factors, political developments, investor sentiment, the global and domestic effects of a pandemic, and other factors that may or may not be related to the issuer of the security or other asset. If the market prices of the fund’s securities and assets fall, the value of your investment will go down.Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, public health events (such as the spread of infectious disease), wars, terrorism, cybersecurity events, technology and data interruptions, natural disasters, and other circumstances in one or more countries or regions could be highly disruptive to, and have profound impacts on, global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the fund’s investments may go down.The pandemic of the novel coronavirus respiratory disease designated COVID-19 has resulted in extreme volatility in the financial markets, a domestic and global economic downturn, severe losses, particularly to some sectors of the economy and individual issuers, and reduced liquidity of many instruments. There also have been significant disruptions to business operations, including business closures; strained healthcare systems; disruptions to supply chains and employee availability; large fluctuations in consumer demand; and widespread uncertainty regarding the duration and long-term effects of the pandemic. The domestic and global economic downturn may be prolonged. The pandemic may result in domestic and foreign political and social instability, damage to diplomatic and international trade relations, and continued volatility and/or decreased liquidity in the securities markets. Developing or emerging market countries may be more impacted by the pandemic.The U.S. government and the Federal Reserve, as well as certain foreign governments and central banks, have taken extraordinary actions to support local and global economies and the financial markets in response to the COVID-19 pandemic, including by pushing interest rates to very low levels. This and other government intervention into the economy and financial markets to address the pandemic may not work as intended, particularly if the efforts are perceived by investors as being unlikely to achieve the desired results. Government actions to mitigate the economic impact of the pandemic have resulted in large expansion of government deficits and debt, the long-term consequences of which are not known. Rates of inflation have recently risen, which could adversely affect economies and markets.The COVID-19 pandemic could continue to adversely affect the value and liquidity of the fund’s investments, impair the fund’s ability to satisfy redemption requests, and negatively impact the fund’s performance. In addition, the pandemic, and measures taken to mitigate its effects, could result in disruptions to the services provided to the fund by its service providers.Energy Sector – Under normal circumstances, the fund concentrates its investments in industries in the energy sector. Investing in the energy sector involves a number of risks, including:•Supply and Demand. A decrease in the production of natural gas, natural gas liquids, crude oil, coal or other energy commodities, a decrease in the volume of such commodities available for transportation, mining, processing, storage or distribution or a sustained decline in demand for such commodities, may adversely impact the financial performance of energy companies.•Depletion and Exploration. Energy reserves naturally deplete as they are consumed over time. The financial performance of energy companies may be adversely affected if they, or the companies to whom they provide services, are unable to cost-effectively acquire additional energy deposits sufficient to replace the natural decline of existing reserves. Also, the quantities of reserves may be overstated, or deposits may not be produced in the time periods anticipated.•Reserve. Energy companies engaged in the production of natural gas, natural gas liquids, crude oil and other energy commodities are subject to the risk that the quantities of their reserves are overstated, or will not be produced in the time periods anticipated, for a variety of reasons.•Regulatory. Energy companies are subject to significant federal, state and local government regulation in virtually every aspect of their operations, including (i) how facilities are constructed, maintained and operated, (ii) how and where wells are drilled, (iii) how services are provided, (iv) environmental and safety controls, and (v) the prices they may charge for the products and services they provide. World events and related economic conditions may lead to disputes among oil-producing countries and potential limits on the production of crude oil, leading to increased volatility in the energy sector.•Commodity Pricing. The operations and financial performance of energy companies may be directly affected by energy commodity prices, especially those energy companies which own the underlying energy commodity or receive payments for services that are based on commodity prices.•Acquisition. The ability of energy companies to grow operating cash flow and increase such company’s enterprise value can be highly dependent on their ability to make accretive acquisitions. In the event that energy companies are unable to make such acquisitions, whether because they are unable to identify attractive acquisition candidates and negotiate and close acceptable purchase contracts or to raise financing for such acquisitions on economically acceptable terms, or otherwise, their future growth may be limited.•Affiliated Party. Certain energy companies are dependent on their parents or sponsors for a majority of their revenues. Any failure by such company’s parents or sponsors to satisfy their payments or obligations would impact such company’s revenues and operating cash flows and ability to make interest payments and/or distributions.•Catastrophe. The operations of energy companies are subject to many hazards inherent in the exploring, developing, producing, generating, transporting, transmission, storing, gathering, processing, refining, distributing, mining or marketing of natural gas, natural gas liquids, crude oil, refined products, coal or electricity, including: damage to pipelines, storage tanks, plants or related equipment and surrounding properties caused by hurricanes, tornadoes, floods, fires and other natural disasters or by acts of terrorism; inadvertent damage from construction and farm equipment; well blowouts; leaks of such energy commodities; fires and explosions.•Terrorism/Market Disruption. Events in the Middle East and elsewhere could have significant adverse effects on the U.S. economy, financial and commodities markets.•Weather. Extreme weather conditions, such as hurricanes, (i) could result in substantial damage to the facilities of certain energy companies located in the affected areas, (ii) significantly increase the volatility in the supply of energy commodities and (iii) adversely affect the financial performance of energy companies, and could therefore adversely affect their securities. The damage done by extreme weather also may serve to increase many insurance premiums paid by energy companies and could adversely affect such companies’ financial condition.•Renewable Energy. Renewable energy infrastructure companies’ future growth may be highly dependent upon on government policies that support renewable power generation and enhance the economic viability of owning renewable electric generation assets. Such policies can include tax credits, accelerated cost-recovery systems of depreciation and renewable portfolio standard programs, which mandate that a specified percentage of electricity sales come from eligible sources of renewable energy. Furthermore, a portion of revenues from investments in renewable energy infrastructure assets is tied, either directly or indirectly, to the wholesale market price for electricity in the markets served. Wholesale market electricity prices are impacted by a number of factors including: the price of fuel (for example, natural gas) that is used to generate electricity; the cost of and management of generation and the amount of excess generating capacity relative to load in a particular market; and conditions (such as extremely hot or cold weather) that impact electrical system demand. In addition, there is uncertainty surrounding the trend in electricity demand growth, which is influenced by macroeconomic conditions; absolute and relative energy prices; and energy conservation and demand management. This volatility and uncertainty in power markets could have a material adverse effect on the assets, liabilities, financial condition, results of operations and cash flow of the companies in which the fund invests.Industry Concentration – The fund concentrates its investments in a specific industry or industries. Concentration in a particular industry heightens the risks associated with that industry. As a result, the fund may be subject to greater price volatility and risk of loss as a result of adverse economic, business or other developments affecting that industry than funds investing in a broader range of industries.Master Limited Partnerships – Investments in MLPs involve risks that differ from investments in corporate issuers, including risks related to limited control and limited rights to vote on matters affecting the MLP, risks related to potential conflicts of interest between the MLP and the MLP’s general partner, cash flow risks, dilution risks, certain tax risks, and risks related to the general partner’s right to require unitholders to sell their common units at an undesirable time or price. MLP entities are typically focused in the energy, natural resources and real estate sectors of the economy. A downturn in the energy, natural resources or real estate sectors of the economy could have an adverse impact on the fund. Energy and natural resources MLPs may be adversely affected by changes in and volatility of commodity prices. At times, the performance of securities of companies in the energy, natural resources and real estate sectors of the economy may lag the performance of other sectors or the broader market as a whole. The yields for equity and debt securities of MLPs and other issuers in the energy sector are susceptible in the short-term to fluctuations in interest rates and the value of the fund’s investments in such securities may decline if interest rates rise. The value of the fund’s investment in MLPs depends to a significant extent on the MLPs being treated as partnerships for U.S. federal income tax purposes. If an MLP does not meet the legal requirements to maintain partnership status, it could be taxed as a corporation and there could be a material decrease in the value of its securities.Renewable Infrastructure Company – Renewable infrastructure companies are susceptible to various factors that may negatively impact their businesses or operations, including costs associated with compliance with and changes in environmental, governmental and other regulations, rising interest costs in connection with capital construction and improvement programs, government budgetary constraints that impact publicly funded projects, the effects of general economic conditions throughout the world, surplus capacity and depletion concerns, increased competition from other providers of services, uncertainties regarding the availability of fuel and other natural resources at reasonable prices, the effects of energy conservation policies, unfavorable tax laws or accounting policies and high leverage. Renewable infrastructure companies will also be affected other factors such as innovations in technology that could render the way in which a company delivers a product or service obsolete and natural or man-made disasters. These and other factors may negatively impact renewable infrastructure companies and adversely affect the fund’s performance.Equity Securities – Equity securities generally have greater risk of loss than debt securities. Stock markets are volatile and the value of equity securities may go up or down, sometimes rapidly and unpredictably. The value of equity securities fluctuates based on real or perceived changes in a company’s financial condition, factors affecting a particular industry or industries, and overall market, economic and political conditions. If the market prices of the equity securities owned by the fund fall, the value of your investment in the fund will decline. The fund may lose its entire investment in the equity securities of an issuer. A change in financial condition or other event affecting a single issuer may adversely impact securities markets as a whole.Non-Diversification – As a “non-diversified” fund, the fund may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. Investing in a smaller number of issuers will make the fund more susceptible to negative events affecting those issuers.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. 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 substantial loss or may not be able to sell at all. Liquidity of particular investments, or even entire asset classes, including U.S. Treasury securities, 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. These differences may increase significantly and affect fund investments more broadly during periods of market volatility. 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 also be impacted by technological issues and/or errors by pricing services or other third party service providers.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.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, or if the investment strategy does not work as intended. 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. 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 be more pronounced during periods of market volatility, may have a negative impact on performance and may generate greater amounts of short-term capital gains.Arbitrage – The strategy is intended to take advantage of a perceived relationship between the value of two or more securities and may not work as intended.Capital Markets Access – Energy companies may be unable to obtain new debt or equity financing on acceptable terms. If funding is not available when needed, or is available only on unfavorable terms, energy companies may not be able to meet their obligations as they come due or respond to competitive pressures.Cash Flow – A substantial portion of the income received by the fund is expected to be derived from investments in equity securities of energy companies. Cash from operations may vary widely from quarter to quarter and may be significantly affected by factors affecting the energy industry in general.Counterparty – The fund could lose money if the counterparties to derivatives, repurchase agreements and other financial contracts entered into for the fund do not fulfill their contractual obligations. 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 perceived to be less creditworthy (whether by market participants or otherwise), 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.Currency – The value of a fund’s 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. Currency exchange rates can be volatile and may fluctuate significantly over short periods of time. Currency conversion costs and currency fluctuations could reduce or eliminate investment gains or add to investment losses. A fund may be unable or may choose not to hedge its foreign currency exposure.Derivatives – The use of derivatives involves a variety of risks, which may be different from, or greater than, the risks associated with investing in traditional securities, such as stocks and bonds. Risks of derivatives include leverage risk, liquidity risk, valuation risk, market risk, counterparty risk, credit risk, operational risk and legal risk. Use of derivatives can increase fund losses, increase costs, reduce opportunities for gains, 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 or impossible 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 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 or at reasonable prices. 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, under the current asset segregation and coverage regulatory framework, 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. The SEC has adopted new Rule 18f-4 under the 1940 Act, which provides a comprehensive regulatory framework for the use of derivatives by registered investment companies and set limits on a fund’s investments in derivatives. Compliance with Rule 18f-4 is not required until August 2022, but the rule may impact the fund’s use of derivatives before that date. Rule 18f-4 could have an adverse impact on the fund’s performance and its ability to implement its investment strategies as it has historically.Distressed or Defaulted Securities – Investments in defaulted securities and obligations of distressed issuers, including securities that are, or may be, involved in reorganizations or other financial restructurings, either out of court or in bankruptcy, involve substantial risks in addition to the risks of investing in high-yield debt securities. These securities are considered speculative. The fund may incur costs to protect its investment, and the fund could lose its entire investment. Distressed securities and any securities received in an exchange for such securities may be subject to restrictions on resale.Extension – When interest rates rise, repayments of fixed-income securities, including asset- and mortgage-backed securities, may occur more slowly than anticipated, causing their market prices to decline.Fixed-Income Securities – Risks of fixed-income securities include 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 fund may lose its entire investment in the fixed-income securities of an issuer.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, sometimes rapidly or unpredictably, 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, sanctions, political or financial instability, social unrest or other adverse economic or political developments. Foreign investments may also be subject to different accounting practices and different regulatory, legal, auditing, financial reporting and recordkeeping standards and practices, and may be more difficult to value than investments in U.S. issuers.High-Yield Debt Securities – High-yield debt securities, commonly referred to as “junk” bonds, are securities that are rated below “investment grade” or are of comparable quality. 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, tend to be volatile, typically have a higher risk of default, tend to be less liquid and more difficult to value than higher grade securities, and may result in losses for the fund.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. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. Changes in interest rates also may affect the liquidity of the fund’s investments. A general rise in interest rates may cause investors to sell fixed-income securities on a large scale, which could adversely affect the price and liquidity of fixed-income securities generally and could also result in increased redemptions from the fund. Increased redemptions could cause the fund to sell securities at inopportune times or depressed prices and result in further losses. The yields for equity securities of MLPs and certain midstream companies (companies that own and operate midstream assets, which are used in energy logistics, including, assets used in transporting, storing, gathering, processing, distributing, or marketing of natural gas, natural gas liquids, crude oil or refined products) are susceptible in the short-term to fluctuations in interest rates and the prices of such equity securities may decline when interest rates rise. This is also true for investments in debt instruments of energy companies. Rising interest rates can adversely impact the financial performance of energy companies by increasing the cost of capital. This may reduce such companies’ ability to execute acquisitions or expansion projects in a cost-effective manner.IPOs – The market value of initial public offering (“IPO”) shares will fluctuate considerably due to factors such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited information about the issuer. The purchase of IPO shares may involve high transaction costs.Large Capitalization Companies – The fund’s investments in larger, more established 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.Large Shareholder – A significant portion of the fund’s shares may be owned by other funds sponsored by 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. These transactions may also accelerate the realization of taxable income to shareholders if such sales of investments resulted in gains. In addition, sizeable redemptions could cause the fund’s total expenses to increase.Leveraging – To the extent that the fund borrows or uses derivatives or other investments, such as ETFs, that have embedded leverage, your investment may be subject to heightened volatility, risk of loss and costs. 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. Use of leverage 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, coverage or margin requirements.Prepayment or Call – Many issuers have a right to prepay their fixed-income securities. 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 may be forced to reinvest the prepayment proceeds in securities with lower yields.Privately Placed and Other Restricted Securities – Restricted securities, which include private placements of private and public companies, are subject to legal or contractual restrictions on their resale. Restricted securities may be difficult to sell at the time and price a fund prefers. Restricted securities may be difficult to value properly and may involve greater risks than securities that are not subject to restrictions on resale, both of which may result in substantial losses. An insufficient number of eligible buyers interested in purchasing restricted securities held by a fund could adversely affect the marketability of such securities and a fund might be unable to dispose of such securities promptly or at reasonable prices, adversely affecting a fund’s overall liquidity and performance. Restricted securities may not be listed on an exchange and may have no active trading market. A fund may incur additional expense when disposing of restricted securities. Restricted securities may involve a high degree of business and financial risk and may result in substantial losses to the fund.Repurchase Agreements – In a repurchase agreement, the fund purchases securities from a broker-dealer or a bank, called the counterparty, upon the agreement of the counterparty to repurchase the securities from the fund at a later date, and at a specified price. The securities purchased serve as the fund's collateral for the obligation of the counterparty to repurchase the securities. If the counterparty does not repurchase the securities, the fund is entitled to sell the securities, but the fund may not be able to sell them for the price at which they were purchased, thus causing a loss. If the counterparty becomes insolvent, there is some risk that the fund will not have a right to the securities, or the immediate right to sell the securities.Short Sales – A short sale may be effected by selling a security that the fund does not own. If the price of the security sold short increases, the fund would incur a loss; conversely, if the price declines, the fund will realize a gain. Although the gain is limited by the price at which the security was sold short, the loss is potentially unlimited. The fund may also pay transaction costs and borrowing fees in connection with short sales.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. Securities of small and medium capitalization companies may be more volatile than and 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.Tax – In order to qualify for treatment as a regulated investment company (“RIC”) under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), the fund must meet certain requirements regarding the composition of its income, the diversification of its assets, and the amounts of its distributions. If the fund were to fail to meet any of these requirements, the fund might not be eligible for treatment as a RIC, in which case it would be subject to federal income tax on its net income at applicable corporate rates (without reduction for distributions to shareholders). When distributed, that income would generally be taxable to shareholders as ordinary dividend income to the extent attributable to the fund’s earnings and profits. If the fund were to fail to qualify as a RIC, shareholders of the fund could realize significantly diminished returns from their investment in the fund. In the alternative, the fund may be able to preserve its RIC qualification under those circumstances by meeting certain conditions, in which case it may be subject to certain additional taxes.The fund may invest no more than 25% of its total assets in the securities of MLPs and other entities treated as qualified publicly traded partnerships for federal income tax purposes. An MLP is an entity treated as a partnership under the Internal Revenue Code, the partnership interests of which are traded on securities exchanges like shares of corporate stock. To qualify as an MLP, an entity must receive at least 90% of its income from qualifying sources such as interest, dividends, income and gain from mineral or natural resources activities, income and gain from the transportation or storage of certain fuels, and, in certain circumstances, income and gain from commodities or futures, forwards and options with respect to commodities. For this purpose, mineral or natural resources activities include exploration, development, production, mining, refining, marketing and transportation (including pipelines) of oil and gas, minerals, geothermal energy, fertilizer, timber or industrial source carbon dioxide. If it does not so qualify, it will generally be subject to tax as a corporation and there could be a material decrease in the value of its securities.Depreciation or other cost recovery deductions passed through to the fund from investments in MLPs in a given year will generally reduce the fund’s taxable income, but those deductions may be recaptured in the fund’s income in one or more subsequent years. When recognized and distributed, recapture income will generally be taxable to shareholders at the time of the distribution at ordinary income tax rates, even though those shareholders might not have held shares in the fund at the time the deductions were taken by the fund, and even though those shareholders may not have corresponding economic gain on their shares at the time of the recapture. In order to distribute recapture income or to fund redemption requests, the fund may need to liquidate investments, which may lead to additional recapture income.Changes in tax laws or regulations, or interpretations thereof in the future, could adversely affect the fund or the issuers in which the fund invests. Any such changes could negatively impact the value of the fund’s investments and the amount and tax characterization of distributions paid by the fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;">You may lose money if you invest in this fund.</span>
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	<span style="font-family:Times New Roman;font-size:10pt;">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.</span>
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:7.00%;">Non-Diversification – </span><span style="font-family:Times New Roman;font-size:10pt;">As a “non-diversified” fund, the fund may invest a larger percentage of its assets in a smaller number of issuers than a diversified fund. Investing in a smaller number of issuers will make the fund more susceptible to negative events affecting those issuers.</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">Performance:</span>
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/investments-fund-center or by calling 1-888-233-4339.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="font-family:Times New Roman;font-size:10pt;"> 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.</span>
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	<span style="font-family:Times New Roman;font-size:10pt;">1-888-233-4339</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="font-family:Times New Roman;font-size:10pt;">www.transamerica.com/investments-fund-center</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="font-family:Times New Roman;font-size:10pt;margin-left:0%;">As with all mutual funds, past performance (before and after taxes) </span><span style="font-family:Times New Roman;font-size:10pt;">is not a prediction of future results.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="font-family:Times New Roman;font-size:8.5pt;font-weight:bold;margin-left:0%;">Annual Total Returns (calendar years ended December 31) - Class A</span>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="font-family:Times New Roman;font-size:10pt;margin-left:0%;">The bar chart does not reflect the impact of sales charges, which, </span><span style="font-family:Times New Roman;font-size:10pt;">if reflected, would lower the returns.</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Quarter EndedReturnBest Quarter:6/30/202024.48%Worst Quarter:3/31/2020-39.27%
Performance Table Heading	rr_PerformanceTableHeading	<span style="font-family:Times New Roman;font-size:8.5pt;font-weight:bold;margin-left:0%;">Average Annual Total Returns (periods ended December 31, 2021)</span>
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	<span style="font-family:Times New Roman;font-size:10pt;"> The table includes deduction of applicable sales charges.</span>
Performance Table Market Index Changed	rr_PerformanceTableMarketIndexChanged	<span style="font-family:Times New Roman;font-size:8pt;">Effective June 1, 2021, the Alerian Midstream Energy Select Total Return Index became the fund’s primary benchmark. Prior to June 1, 2021, the fund’s primary benchmark was the S&P 500</span><span style="font-family:Times New Roman;font-size:4.5pt;position:relative;top:-5.5pt;">®</span><span style="font-family:Times New Roman;font-size:8pt;line-height:10pt;"> </span><span style="font-family:Times New Roman;font-size:8pt;"> Index. The change to the Alerian Midstream Energy Select Total Return Index was made to more accurately reflect the principal investment strategies of the fund.</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="font-family:Times New Roman;font-size:10pt;margin-left:0%;">The after-tax returns are calculated using the historic highest individual</span><span style="font-family:Times New Roman;font-size:10pt;"> federal marginal income tax rates and do not reflect the impact of state and local taxes.</span>
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	<span style="font-family:Times New Roman;font-size:10pt;"> 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.</span>
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	<span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0%;">After-tax returns are presented for only one class, and returns </span><span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;">for other classes are presented before taxes only and will vary.</span>
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.After-tax returns are presented for only one class, and returns for other classes are presented before taxes only and will vary.
Retail Class | Transamerica Energy Infrastructure | A
Risk Return Abstract	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	1.05%	[2]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Recaptured expense	rr_Component1OtherExpensesOverAssets	0.05%	[3],[4]
All other expenses	rr_Component2OtherExpensesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.30%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.60%
1 year	rr_ExpenseExampleYear01	$ 704
3 years	rr_ExpenseExampleYear03	1,027
5 years	rr_ExpenseExampleYear05	1,373
10 years	rr_ExpenseExampleYear10	2,346
1 year	rr_ExpenseExampleNoRedemptionYear01	704
3 years	rr_ExpenseExampleNoRedemptionYear03	1,027
5 years	rr_ExpenseExampleNoRedemptionYear05	1,373
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 2,346
2014	rr_AnnualReturn2014	3.35%
2015	rr_AnnualReturn2015	(37.19%)
2016	rr_AnnualReturn2016	29.65%
2017	rr_AnnualReturn2017	(0.38%)
2018	rr_AnnualReturn2018	(15.60%)
2019	rr_AnnualReturn2019	15.33%
2020	rr_AnnualReturn2020	(11.45%)
2021	rr_AnnualReturn2021	22.83%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="font-family:Times New Roman;font-size:9pt;margin-left:0.0pt;">Best Quarter:</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	24.48%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="font-family:Times New Roman;font-size:9pt;margin-left:0.0pt;">Worst Quarter:</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(39.27%)
1 Year	rr_AverageAnnualReturnYear01	16.10%
5 Years	rr_AverageAnnualReturnYear05	(0.07%)
Since Inception	rr_AverageAnnualReturnSinceInception	(1.17%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2013
Retail Class | Transamerica Energy Infrastructure | C
Risk Return Abstract	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%	[1]
Management fees	rr_ManagementFeesOverAssets	1.05%	[2]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Recaptured expense	rr_Component1OtherExpensesOverAssets	0.01%	[3],[4]
All other expenses	rr_Component2OtherExpensesOverAssets	0.29%
Other expenses	rr_OtherExpensesOverAssets	0.30%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.35%
1 year	rr_ExpenseExampleYear01	$ 338
3 years	rr_ExpenseExampleYear03	733
5 years	rr_ExpenseExampleYear05	1,255
10 years	rr_ExpenseExampleYear10	2,686
1 year	rr_ExpenseExampleNoRedemptionYear01	238
3 years	rr_ExpenseExampleNoRedemptionYear03	733
5 years	rr_ExpenseExampleNoRedemptionYear05	1,255
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 2,686
1 Year	rr_AverageAnnualReturnYear01	20.89%
5 Years	rr_AverageAnnualReturnYear05	0.31%
Since Inception	rr_AverageAnnualReturnSinceInception	(1.28%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2013
Retail Class | Transamerica Energy Infrastructure | I
Risk Return Abstract	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	1.05%	[2]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Recaptured expense	rr_Component1OtherExpensesOverAssets	none	[3],[4]
All other expenses	rr_Component2OtherExpensesOverAssets	0.18%
Other expenses	rr_OtherExpensesOverAssets	0.18%	[5]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.23%
1 year	rr_ExpenseExampleYear01	$ 125
3 years	rr_ExpenseExampleYear03	390
5 years	rr_ExpenseExampleYear05	676
10 years	rr_ExpenseExampleYear10	1,489
1 year	rr_ExpenseExampleNoRedemptionYear01	125
3 years	rr_ExpenseExampleNoRedemptionYear03	390
5 years	rr_ExpenseExampleNoRedemptionYear05	676
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,489
1 Year	rr_AverageAnnualReturnYear01	23.48%
5 Years	rr_AverageAnnualReturnYear05	1.37%
Since Inception	rr_AverageAnnualReturnSinceInception	(0.24%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2013
Retail Class | Transamerica Energy Infrastructure | Return After Taxes on Distributions | A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.66%
5 Years	rr_AverageAnnualReturnYear05	(0.84%)
Since Inception	rr_AverageAnnualReturnSinceInception	(1.99%)
Retail Class | Transamerica Energy Infrastructure | Return After Taxes on Distributions and Sale of Fund Shares | A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.57%
5 Years	rr_AverageAnnualReturnYear05	(0.33%)
Since Inception	rr_AverageAnnualReturnSinceInception	(1.14%)
Retail Class | Transamerica Energy Infrastructure | Alerian Midstream Energy Select Total Return Index (reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	40.75%	[6]
5 Years	rr_AverageAnnualReturnYear05	1.81%	[6]
Since Inception	rr_AverageAnnualReturnSinceInception	2.47%	[6]
Retail Class | Transamerica Energy Infrastructure | S&P 500® Index (reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	28.71%
5 Years	rr_AverageAnnualReturnYear05	18.47%
Since Inception	rr_AverageAnnualReturnSinceInception	15.71%
Retail Class | Transamerica Energy Infrastructure | Alerian MLP Total Return Index (reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	40.17%
5 Years	rr_AverageAnnualReturnYear05	(2.70%)
Since Inception	rr_AverageAnnualReturnSinceInception	(2.97%)

[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. A deferred sales charge on Class A and C shares may apply to certain redemptions of shares purchased by exchange from another Transamerica Fund.

[2] Management fees have been restated to reflect a reduction in management fees effective June 1, 2021.

[3] Contractual arrangements have been made with the fund’s investment manager, Transamerica Asset Management, Inc. (“TAM”), through March 1, 2023 to waive fees and/or reimburse fund expenses to the extent that total annual fund operating expenses exceed 1.60% for Class A shares, 2.35% for Class C shares and 1.35% 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, 2023 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 if the class’ total annual fund operating expenses have fallen to a level below the limits described above. In no case will TAM recapture any amount that would result, on any particular business day of the fund, in the class’ total annual operating expenses exceeding the applicable limits described above or any other lower limit then in effect.

[4] Recaptured expenses are based on estimates for the current fiscal year.

[5] Other expenses have been revised to reflect current transfer agency fees with respect to Class I.

[6] Effective June 1, 2021, the Alerian Midstream Energy Select Total Return Index became the fund’s primary benchmark. Prior to June 1, 2021, the fund’s primary benchmark was the S&P 500® Index. The change to the Alerian Midstream Energy Select Total Return Index was made to more accurately reflect the principal investment strategies of the fund.