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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2022
Retail Class | Transamerica International Focus  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="font-family:Times New Roman;font-size:11pt;font-weight:bold;">Transamerica International Focus</span><br/><span style="font-family:Times New Roman;font-size:11pt;font-weight:bold;">(formerly, Transamerica International Growth)</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">Investment Objective:</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;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="color:#000000;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="color:#000000;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="color:#000000;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 </span><span style="font-family:Times New Roman;font-size:8pt;">1, 2023</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;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 21% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 21.00%
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="color:#000000;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="color:#000000;font-family:Times New Roman;font-size:10pt;">family invest, or agree to invest in the future, at least </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">$50,000</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> in Transamerica Funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates <span style="font-family:Times New Roman;font-size:8pt;">Other expenses are based on estimates for the current fiscal year.</span>
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent <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="color:#000000;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="color:#000000;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="color:#000000;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 The fund’s sub-adviser, Epoch Investment Partners, Inc. (the “sub-adviser”), invests, under normal circumstances, at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in common stocks and related equity securities—such as preferred stock, convertible securities and depositary receipts—of issuers economically tied to a number of countries throughout the world, including emerging market countries. In selecting investments for the fund, the sub-adviser seeks companies that have demonstrated superior earnings growth, positive business momentum and sustainable profitability while seeking not to overpay for these growth characteristics. 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. The sub-adviser may invest the fund’s assets in companies of any size. The fund may also invest in warrants and rights.The sub-adviser will normally invest the fund’s assets in investments economically tied to at least three countries not including the United States. The sub-adviser may invest a large percentage of the fund’s assets in issuers in a single country, a small number of countries, or a particular geographic region. The sub-adviser generally considers an issuer of a security or other investment to be economically tied to a particular country if (a) the security or other investment is issued or guaranteed by the government of that country or any of its agencies, authorities or instrumentalities; (b) the issuer is organized under the laws of, and maintains a principal office in, that country; (c) the issuer has its principal securities trading market in that country; (d) the issuer derives 50% or more of its total revenues from goods sold or services performed in that country; (e) the issuer has 50% or more of its assets in that country; or (f) the issuer is included in an index which is representative of that country.The sub-adviser normally allocates the fund's investments across different industries and sectors, but the sub-adviser may invest a significant percentage of the fund's assets in issuers in a single or small number of industries or sectors.The sub-adviser uses a “bottom-up” investment approach to buying and selling investments for the fund. A “bottom-up” approach is looking at individual companies against the context of broader market factors. Investments are selected primarily based on fundamental analysis of individual issuers and their potential in light of their financial condition, and market, economic, political, and regulatory conditions. Factors considered may include analysis of an issuer’s earnings, cash flows, competitive position, and management ability. The sub-adviser uses a quantitative screen to seek to identify companies with growth characteristics, positive earnings sentiment, stable profitability and reasonable valuations. The sub-adviser may engage in active and frequent trading in pursuing the fund’s principal investment strategies.The fund may invest up to 5% of its assets in China A-shares (equity securities of Chinese companies) listed and traded on Chinese stock exchanges such as the Shanghai Stock Exchange or the Shenzhen Stock Exchange.
Risk [Heading] rr_RiskHeading <span style="color:#000000;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 impactedby 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.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.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.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.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.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.Emerging Markets – Investments in securities of issuers located or doing business in emerging markets are subject to heightened foreign investments risks and may experience rapid and extreme changes in value. Emerging market countries tend to have less developed and less stable economic, political and legal systems and regulatory and accounting standards, may have policies that restrict investment by foreigners or that prevent foreign investors such as the fund from withdrawing their money at will, and are more likely to experience nationalization, expropriation and confiscatory taxation. In addition, emerging market securities may have low trading volumes and may be or become illiquid.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.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 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 new, the actual effect on the market for trading China  A-shares with the introduction of large numbers of foreign investors is currently unknown. Further, 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 applicable exchanges in Hong Kong and mainland China 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.In addition, uncertainties in mainland China tax legislation 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. For example, if market interest rates rise, the value of a convertible security typically falls. In addition, a convertible security is subject to the risk that the issuer will not be able to pay interest or dividends when due, and the market value of the security may change based on the issuer’s actual or perceived creditworthiness. Since the convertible security derives a portion of 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.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.Depositary Receipts – Depositary receipts are generally subject to the same risks as are the foreign securities that they evidence or into which they may be converted, and they may be less liquid than the underlying shares in their primary trading market. 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.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.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.Preferred Stock – Preferred stock’s right to dividends and liquidation proceeds is junior to the rights of a company’s debt securities. The value of preferred stock may be subject to factors that affect fixed-income and equity securities. The value of preferred stock tends to vary more with fluctuations in the underlying common stock and less with fluctuations in interest rates and tends to exhibit greater volatility.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.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 <span style="color:#000000;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="color:#000000;font-family:Times New Roman;font-size:10pt;">An investment in the fund is </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:0%;">not a bank deposit and is not insured or guaranteed by the Federal </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">Deposit Insurance Corporation or any other government agency.</span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;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.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, reimbursements 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="color:#000000;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.</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</span><span style="font-family:Times New Roman;font-size:10pt;">-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="color:#000000;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="color:#000000;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:6/30/202022.92%Worst Quarter:3/31/2020-22.22%
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, </span><span style="font-family:Times New Roman;font-size:8.5pt;font-weight:bold;line-height:11pt;"> </span><span style="font-family:Times New Roman;font-size:8.5pt;font-weight:bold;">2021)</span>
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> The table includes deduction </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">of applicable sales charges.</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;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="color:#000000;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="color:#000000;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="color:#000000;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="color:#000000;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 International Focus | 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 0.74%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Recaptured expense rr_Component1OtherExpensesOverAssets none [2],[3]
All other expenses rr_Component2OtherExpensesOverAssets 0.42%
Other expenses rr_OtherExpensesOverAssets 0.42%
Total annual fund operating expenses rr_ExpensesOverAssets 1.41%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.21% [2]
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 952
5 years rr_ExpenseExampleYear05 1,260
10 years rr_ExpenseExampleYear10 2,131
1 year rr_ExpenseExampleNoRedemptionYear01 666
3 years rr_ExpenseExampleNoRedemptionYear03 952
5 years rr_ExpenseExampleNoRedemptionYear05 1,260
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,131
2019 rr_AnnualReturn2019 27.29%
2020 rr_AnnualReturn2020 20.83%
2021 rr_AnnualReturn2021 10.37%
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 22.92%
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 (22.22%)
1 Year rr_AverageAnnualReturnYear01 4.33%
Since Inception rr_AverageAnnualReturnSinceInception 7.89%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2018
Retail Class | Transamerica International Focus | 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 0.74%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Recaptured expense rr_Component1OtherExpensesOverAssets none [2],[3]
All other expenses rr_Component2OtherExpensesOverAssets 0.04%
Other expenses rr_OtherExpensesOverAssets 0.04% [4]
Total annual fund operating expenses rr_ExpensesOverAssets 1.78%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.78%
1 year rr_ExpenseExampleYear01 $ 281
3 years rr_ExpenseExampleYear03 560
5 years rr_ExpenseExampleYear05 964
10 years rr_ExpenseExampleYear10 2,095
1 year rr_ExpenseExampleNoRedemptionYear01 181
3 years rr_ExpenseExampleNoRedemptionYear03 560
5 years rr_ExpenseExampleNoRedemptionYear05 964
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,095
Retail Class | Transamerica International Focus | 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 0.74%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Recaptured expense rr_Component1OtherExpensesOverAssets 0.17% [2],[3]
All other expenses rr_Component2OtherExpensesOverAssets 0.14%
Other expenses rr_OtherExpensesOverAssets 0.31% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 1.05%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.05%
1 year rr_ExpenseExampleYear01 $ 107
3 years rr_ExpenseExampleYear03 334
5 years rr_ExpenseExampleYear05 579
10 years rr_ExpenseExampleYear10 1,283
1 year rr_ExpenseExampleNoRedemptionYear01 107
3 years rr_ExpenseExampleNoRedemptionYear03 334
5 years rr_ExpenseExampleNoRedemptionYear05 579
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,283
1 Year rr_AverageAnnualReturnYear01 10.66%
Since Inception rr_AverageAnnualReturnSinceInception 9.71%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2018
Retail Class | Transamerica International Focus | R6  
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 0.74%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Recaptured expense rr_Component1OtherExpensesOverAssets none [2],[3]
All other expenses rr_Component2OtherExpensesOverAssets 0.05%
Other expenses rr_OtherExpensesOverAssets 0.05%
Total annual fund operating expenses rr_ExpensesOverAssets 0.79%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.79%
1 year rr_ExpenseExampleYear01 $ 81
3 years rr_ExpenseExampleYear03 252
5 years rr_ExpenseExampleYear05 439
10 years rr_ExpenseExampleYear10 978
1 year rr_ExpenseExampleNoRedemptionYear01 81
3 years rr_ExpenseExampleNoRedemptionYear03 252
5 years rr_ExpenseExampleNoRedemptionYear05 439
10 years rr_ExpenseExampleNoRedemptionYear10 $ 978
1 Year rr_AverageAnnualReturnYear01 10.74%
Since Inception rr_AverageAnnualReturnSinceInception 9.93%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2018
Retail Class | Transamerica International Focus | Return After Taxes on Distributions | A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.90%
Since Inception rr_AverageAnnualReturnSinceInception 6.36%
Retail Class | Transamerica International Focus | Return After Taxes on Distributions and Sale of Fund Shares | A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.48%
Since Inception rr_AverageAnnualReturnSinceInception 5.86%
Retail Class | Transamerica International Focus | MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.78%
Since Inception rr_AverageAnnualReturnSinceInception 6.69%
[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] 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 1.20% for Class A shares, 1.95% for Class C shares, 1.05% for Class I shares and 0.87% 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, 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.
[3] Recaptured expenses are based on estimates for the current fiscal year.
[4] Other 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.