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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Class I2 | Transamerica Government Money Market  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <b>Transamerica Government Money Market </b>
Objective [Heading] rr_ObjectiveHeading <b>Investment Objective:</b>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks as high a level of current income as is consistent with preservation of capital and liquidity.
Expense [Heading] rr_ExpenseHeading <b>Fees and Expenses:</b>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <b>Shareholder Fees (fees paid directly from your investment) </b>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) </b>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2020
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management fees have been restated to reflect a reduction in management fees effective November 1, 2018.
Expense Example [Heading] rr_ExpenseExampleHeading <b>Example:</b>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading <b>Principal Investment Strategies:</b>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund is a government money market fund. The fund seeks to maintain a stable net asset value of $1.00 per share by investing in:
  • High-quality, U.S. dollar-denominated short-term money market securities issued or guaranteed as to principal or interest by the U.S. government or its agencies or instrumentalities;
  • repurchase agreements that are fully collateralized by U.S. government securities or cash; and
  • cash.
The fund's sub-adviser, BlackRock Investment Management, LLC (the “sub-adviser”), invests at least 99.5% of the fund's total assets (plus the amount of borrowings, if any, for investment purposes) in cash, U.S. Treasury bills, notes and other obligations issued or guaranteed as to principal and interest by the U.S. Government, it’s agencies or instrumentalities, and repurchase agreements secured by such obligations or cash. Under normal circumstances, the fund invests at least 80% of its net assets (plus the amount of borrowings, if any, for investment purposes) in U.S. Treasury bills, notes and other obligations issued or guaranteed as to principal and interest by the U.S. Government, its agencies or instrumentalities, and repurchase agreements secured by such obligations.

The fund will enter into repurchase agreements only with financial institutions that the sub-adviser determines are creditworthy. A financial institution must furnish collateral to the fund at least equal in value to the amount of its repurchase obligation. This collateral must consist of U.S. government securities or cash. The sub-adviser is responsible for ensuring that each repurchase agreement is eligible for purchase by the fund.

In managing the fund's assets, the sub-adviser uses a combination of “top down” analysis of macroeconomic and interest rate environments and “bottom up” research of sectors and issuers. In the sub-adviser’s qualitative “top down” approach, the sub-adviser analyzes various fundamental and technical factors that may affect the movement of markets. In its “bottom up” research, the sub-adviser considers various fundamental and other factors, such as creditworthiness and collateral and covenants to specific markets and individual issuers.

The fund invests in securities with a maximum remaining maturity of 397 days or less (with certain exceptions) and maintains a dollar-weighted average fund maturity of 60 days or less and a dollar-weighted average life of 120 days or less. The fund may invest in variable and floating rate instruments, and transact in securities on a when-issued, delayed delivery or forward commitment basis.

The fund invests in accordance with the quality, maturity, liquidity and diversification requirements applicable to Rule 2a-7 under the Investment Company Act of 1940 and other rules of the Securities and Exchange Commission. The fund will only purchase securities that present minimal credit risk as determined by the sub-adviser pursuant to guidelines approved by the sub-adviser or the fund's Board of Trustees.

The fund may invest in other government money market funds to the extent permitted by law.

If the fund takes a temporary defensive position, it will be more difficult for the fund to achieve its investment objective. Although the sub-adviser has the ability to take defensive positions, it may choose not to do so for a variety of reasons, including during volatile market conditions.
Risk [Heading] rr_RiskHeading <b>Principal Risks:</b>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The fund's sponsor has no legal obligation to provide financial support to the fund, and you should not expect that the sponsor will provide financial support to the fund at any time.

You should be aware that money market funds have, in the past, "broken the buck," which means that investors did not receive $1.00 per share for their investment in those funds, and this could happen again. If a money market fund breaks the buck or if money market funds are perceived to be likely to do so, there could be significant redemptions from money market funds, driving market prices of securities down and making it more difficult for the fund to maintain a $1.00 per share net asset value.

As a government money market fund, the fund is not required to impose a fee upon sale of your shares (liquidity fees) or temporarily suspend your ability to sell shares if the fund liquidity falls below required minimums (redemption gates), and has no current intention to voluntarily impose such "liquidity fees" or "redemption gates". However, the Board of Trustees reserves the right to impose liquidity fees and/or redemption gates in the future.

There is no assurance that the fund will meet its investment objective. The fund could underperform short-term debt instruments or other money market funds, or you could lose money, as a result of risks (in alphabetical order) such as:

Active Trading – The fund may purchase and sell securities without regard to the length of time held. Active trading may have a negative impact on performance by increasing transaction costs and may generate greater amounts of net short-term capital gains, which, for shareholders holding shares in taxable accounts, would generally be subject to tax at ordinary income tax rates upon distribution. During periods of market volatility, active trading may be more pronounced.

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

Credit – 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 may default or its credit may be downgraded, or may be perceived to be less creditworthy, or the value of assets underlying a security may decline. A decline may be significant, particularly in certain market environments.

Cybersecurity – Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, shareholder data (including private shareholder information), and/or proprietary information, or cause the fund, TAM, a sub-adviser and/or the fund's other service providers (including, but not limited to, fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. A cybersecurity incident may disrupt the processing of shareholder transactions, impact the fund's ability to calculate its net asset values, and prevent shareholders from redeeming their shares.

Extension – When interest rates rise, repayments of fixed income securities, particularly asset- and mortgage-backed securities, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone.

Fixed-Income Securities – 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, 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. The value of fixed-income securities will generally go down when interest rates rise. Interest rates have been at historically low levels in the U.S., so the fund faces a heightened risk that interest rates may rise. A general rise in interest rates may cause investors to move out of fixed-income securities on a large scale, which could adversely affect the price and liquidity of fixed-income securities. A rise in rates tends to have a greater impact on the prices of longer term or duration securities.

Government Money Market Fund – The fund operates as a "government" money market fund under applicable federal regulations. The fund continues to use the special pricing and valuation conventions that currently facilitate a stable share price of $1.00, although there is no guarantee that the fund will be able to maintain a $1.00 share price. The fund does not currently intend to avail itself of the ability to impose "liquidity fees" and/or "redemption gates" on fund redemptions, as permitted under the applicable regulations. However, the Board reserves the right, with notice to shareholders, to change this policy, thereby permitting the fund to impose such fees and gates in the future.

Interest Rate – The interest rates on short-term obligations held in the fund will vary, rising or falling with short-term interest rates generally. Interest rates in the United States have been at historically low levels. The fund's yield will tend to lag behind general changes in interest rates. The ability of the fund's yield to reflect current market rates will depend on how quickly the obligations in its portfolio mature and how much money is available for investment at current market rates. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions from the fund.

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

Legal and Regulatory – Legal and regulatory changes could occur that may adversely affect the fund, its investments, and its ability to pursue its investment strategies and/or increase the costs of implementing such strategies. New or revised laws or regulations may be imposed by the U.S. Securities and Exchange Commission, the U.S. Commodity Futures Trading Commission, the Internal Revenue Service, the U.S. Federal Reserve or other governmental regulatory authorities or self-regulatory organizations that could adversely affect the fund. The fund also may be adversely affected by changes in the enforcement or interpretation of existing statutes and rules by governmental regulatory authorities or self-regulatory organizations.

Liquidity – The fund may make investments that are illiquid or that become illiquid after purchase. Investments may become illiquid due to the lack of an active market, a reduced number of traditional market participants, or reduced capacity of traditional market participants to make a market in securities. The liquidity and value of investments can deteriorate rapidly and those investments may be difficult or impossible for the fund to sell, particularly during times of market turmoil. Illiquid investments can be difficult to value, may trade at a discount from comparable, more liquid investments, and may be subject to wide fluctuations in value. As a general matter, dealers recently have been less willing to make markets for fixed income securities. If the fund is forced to sell an illiquid investment to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of certain securities for an extended period (for example, several weeks or even longer).

Management – The fund is subject to the risk that the investment manager's or sub-adviser's judgments and decisions may be incorrect or otherwise may not produce the desired results. The fund is also subject to the risk of 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 sub-adviser, if such tools, resources, information or data are used incorrectly or otherwise do not work as intended, or if the sub-adviser's investment style fails to produce the desired results. In addition, the fund's investment strategies or policies may change from time to time. Those changes may not lead to the results intended by the investment manager and could have an adverse effect on the performance of the fund. Any of these things could cause the fund to lag relevant benchmarks or other funds with similar objectives.

Market – A change in interest rates or a decline in the market value of a fund investment, lack of liquidity in the bond markets, real or perceived adverse economic or political conditions, inflation, or other market events could cause the value of your investment in the fund, or its yield, to decline. While the fund seeks to maintain a $1.00 share price, when market prices fall, the value of your investment could go down.

In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty. These conditions may continue, recur, worsen or spread.

There has been significant U.S. and non-U.S. government and central bank intervention in and support of financial markets during the past decade. The Federal Reserve has reduced and begun unwinding its market support activities and has begun raising interest rates. Certain foreign governments and central banks are implementing so-called negative interest rates (e.g., charging depositors who keep their cash at a bank) to spur economic growth. Further Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases, unwinding of quantitative easing, or contrary actions by different governments, may not work as intended, could negatively affect financial markets generally, increase market volatility, and reduce the value and liquidity of securities in which the fund invests.

Policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation, and may in some instances contribute to decreased liquidity and increased volatility in the financial markets. The impact of these changes on the markets, and the practical implications for market participants, may not be fully known for some time.

Economies and financial markets throughout the world are increasingly interconnected. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the fund's investments may be negatively affected.

Mortgage-Related Securities – The value of mortgage-related securities will be influenced by factors affecting the housing market. As a result, during periods of declining asset values, difficult or frozen credit markets, swings in interest rates, or deteriorating economic conditions, mortgage-related securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. Mortgage-backed securities may be issued by government-sponsored entities such as Fannie Mae or Freddie Mac or by agencies of the U.S. government, such as Ginnie Mae. Mortgage-backed securities represent direct or indirect participations in, or are collateralized by and payable from, mortgage loans secured by real property. The value of mortgage-backed securities may be affected by changes in credit quality or value of the mortgage loans. Mortgage-backed securities are subject to prepayment or call and extension risks. Some of these securities may receive little or no collateral protection from the underlying assets. The structure of some of these securities may be complex and there may be less information available than for other types of debt securities. Upon the occurrence of certain triggering events or defaults, the fund may become the holder of underlying assets at a time when those assets may be difficult to sell or may be sold only at a loss.

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

Redemption – The fund may experience periods of heavy redemptions that could cause the fund to liquidate its assets at inopportune times or at a loss or depressed value. Redemption risk is greater to the extent that the fund has investors with large shareholdings, short investment horizons, or unpredictable cash flow needs. The redemption by one or more large shareholders of their holdings in the fund could have an adverse impact on the remaining shareholders in the fund. In addition, the fund may suspend redemptions when permitted by applicable regulations.

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, which is typically higher than the purchase price paid by the fund. 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.

Underlying Government Money Market Funds – The fund may invest in other government money market funds. Each of the underlying government money market funds in which the fund may invest has its own investment risks. There can be no assurance that the investment objective of any underlying government money market fund will be achieved. In addition, the fund will bear a pro rata portion of the operating expenses of the underlying government money market funds in which it invests.

U.S. Government Agency Obligations – Government agency obligations have different levels of credit support and, therefore, different degrees of credit risk. Securities issued by agencies and instrumentalities of the U.S. government that are supported by the full faith and credit of the U.S. generally present a lesser degree of credit risk than securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the issuer's right to borrow from the U.S. Treasury and securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the credit of the issuing agencies.

Yield – The amount of income received by the fund will go up or down depending on day-to-day variations in short-term interest rates, and when interest rates are very low the fund's expenses could absorb all or a significant portion of the fund's income. If interest rates increase, the fund's yield may not increase proportionately. For example, TAM or its affiliates may discontinue any temporary voluntary fee limitation or recoup amounts previously waived or reimbursed. In addition, the implementation of recently adopted requirements for money market funds may have a negative effect on the fund's yield. The fund may hold cash uninvested and, if so, will not earn income on those assets.
Risk Lose Money [Text] rr_RiskLoseMoney <b>You could lose money by investing in the fund.</b>
Risk Money Market Fund May Not Preserve Dollar [Text] rr_RiskMoneyMarketFundMayNotPreserveDollar Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Risk Money Market Fund May Impose Fees or Suspend Sales [Text] rr_RiskMoneyMarketFundMayImposeFeesOrSuspendSales As a government money market fund, the fund is not required to impose a fee upon sale of your shares (liquidity fees) or temporarily suspend your ability to sell shares if the fund liquidity falls below required minimums (redemption gates), and has no current intention to voluntarily impose such "liquidity fees" or "redemption gates".
RIsk Not Insured [Text] rr_RiskNotInsured An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Money Market Fund Sponsor May Not Provide Support [Text] rr_RiskMoneyMarketFundSponsorMayNotProvideSupport The fund's sponsor has no legal obligation to provide financial support to the fund, and you should not expect that the sponsor will provide financial support to the fund at any time.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <b>Performance:</b>
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 the fund's average annual total returns for different periods.

The fund's performance reflects the effect of contractual and voluntary fee waivers and/or expense reimbursements by TAM and amounts recaptured by TAM under such arrangements.

Prior to May 1, 2016, the fund operated as a "prime" money market fund and invested in certain types of securities that the fund is no longer permitted to hold. Consequently, the performance information below might have been different if the current investment limitations had been in effect prior to the conversion to a government money market fund. Performance shown for periods prior to May 1, 2016 reflects the fund's former investment strategy.

As with all mutual funds, past performance (before and after taxes) is not a prediction of future results. Updated performance information is available on our website at www.transamerica.com/individual/products/mutual-funds/performance/ or by calling 1-888-233-4339.

Prior to November 1, 2018, the fund had a different sub-adviser and used different investment strategies. The performance set forth prior to that date is attributable to a previous sub-adviser.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows the fund’s average annual total returns for different periods.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-233-4339
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.transamerica.com/individual/products/mutual-funds/performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, past performance (before and after taxes) is not a prediction of future results.
Bar Chart [Heading] rr_BarChartHeading <b>Annual Total Returns (calendar years ended December 31) - Class I2 </b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Return
Best Quarter: 03/31/2009 0.09%
Worst Quarter: 6/30/2013 0.00%
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns (periods ended December 31, 2018)</b>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock Actual returns may depend on the investor's individual tax situation and may differ from those shown.

Call customer service (1-888-233-4339) for the current 7-day yield.

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.
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone (1-888-233-4339)
Class I2 | Transamerica Government Money Market | I2  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.24% [1]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Recaptured expense rr_Component1OtherExpensesOverAssets 0.17% [2]
All other expenses rr_Component2OtherExpensesOverAssets 0.07%
Other expenses rr_OtherExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 0.48%
1 year rr_ExpenseExampleYear01 $ 49
3 years rr_ExpenseExampleYear03 154
5 years rr_ExpenseExampleYear05 269
10 years rr_ExpenseExampleYear10 $ 604
2009 rr_AnnualReturn2009 0.12%
2010 rr_AnnualReturn2010 0.02%
2011 rr_AnnualReturn2011 0.02%
2012 rr_AnnualReturn2012 0.04%
2013 rr_AnnualReturn2013 0.04%
2014 rr_AnnualReturn2014 0.02%
2015 rr_AnnualReturn2015 0.01%
2016 rr_AnnualReturn2016 0.01%
2017 rr_AnnualReturn2017 0.01%
2018 rr_AnnualReturn2018 0.01%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.09%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 0.01%
5 Years rr_AverageAnnualReturnYear05 0.01%
10 Years rr_AverageAnnualReturnYear10 0.03%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2005
7-DAY YIELD (as of December 31, 2018) rr_MoneyMarketSevenDayYield 0.01%
Class I2 | Transamerica Government Money Market | Return after taxes on distributions | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 none
5 Years rr_AverageAnnualReturnYear05 none
10 Years rr_AverageAnnualReturnYear10 0.02%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2005
Class I2 | Transamerica Government Money Market | Return after taxes on distributions and sale of fund shares | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 none
5 Years rr_AverageAnnualReturnYear05 none
10 Years rr_AverageAnnualReturnYear10 0.02%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 15, 2005
[1] Management fees have been restated to reflect a reduction in management fees effective November 1, 2018.
[2] Contractual arrangements have been made with the fund’s investment manager, Transamerica Asset Management, Inc. (“TAM”), through March 1, 2020 to waive fees and/or reimburse fund expenses to the extent that total annual fund operating expenses exceed 0.48% for Class I2 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, 2020 without the Board of Trustees’ consent. TAM is permitted to recapture amounts waived and/or reimbursed to a class during any of the 36 months from the date on which TAM waived fees and/or reimbursed expenses for the class. A class may reimburse TAM only if such reimbursement does not cause, on any particular business day of the fund, the class’ total annual operating expenses (after the reimbursement is taken into account) to exceed the applicable limits described above or any other lower limit then in effect.