Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

TRANSAMERICA FUNDS

Prospectus Date

rr_ProspectusDate

Mar. 01, 2015

Transamerica Asset Allocation - Moderate Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

TRANSAMERICA ASSET ALLOCATION-MODERATE PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective:

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Seeks capital appreciation and current income.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses:

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Transamerica Funds. More information about these and other discounts is available from your financial professional and in the “Waivers and/or Reductions of Charges” section on page 339 of the fund’s prospectus and in the fund’s statement of additional information (SAI) under the heading “Purchase of Shares.”

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover:

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the fund’s performance.

During the most recent fiscal year, the portfolio turnover rate for the fund was 27% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

27.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Transamerica Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Total annual fund operating expenses do not correlate to the ratios of expenses to average net assets in the financial highlights table, which do not include acquired (i.e., underlying) funds' fees and expenses and do not reflect the reduction of 0.05% in the distribution and services (12b-1) fees on Class A shares effective March 1, 2014 for an entire fiscal year.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example:

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all shares at the end of those periods (unless otherwise indicated). The Example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

If the shares are redeemed at the end of each period:

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

If the shares are not redeemed:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund seeks to achieve its investment objective by investing its assets in a broad mix of underlying Transamerica Funds (“underlying funds”).

• Under normal circumstances, investments in underlying funds are expected to achieve a mix over time of approximately 50% of net assets in equities, which may include both stocks and commodity-related securities, and approximately 50% of net assets in fixed-income, which may include bonds, cash, cash equivalents, and other money market instruments. These percentages may vary.

• The underlying funds may invest in a variety of U.S. and foreign (including emerging market) equity and fixed-income (including high-yield) securities and alternative investments. The underlying funds may also invest in real estate investment trusts ("REITs").

• Allocation of assets among the underlying funds is based on factors such as diversification, general market outlooks, historical performance, current valuations, and other global economic factors.

• The fund may also invest directly in U.S. government securities and/or short-term commercial paper.

Each underlying fund has its own investment objective, principal investment strategies and investment risks. The “Underlying Funds” section of the prospectus lists the underlying funds currently available for investment by the fund, provides a summary of their respective investment objectives and principal investment strategies, and identifies certain risks of the underlying funds.

The fund may have exposure to derivatives instruments, such as options, futures or forward contracts and swaps through its investments in the underlying funds.

It is not possible to predict the extent to which the fund will be invested in a particular underlying fund at any time. The fund may be a significant shareholder in certain underlying funds.

The Portfolio Construction Manager, Morningstar Associates, LLC, may change the fund's asset allocation and underlying funds at any time without notice to shareholders and without shareholder approval.

Risk [Heading]

rr_RiskHeading

Principal Risks:

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Risk is inherent in all investing. Many factors affect the fund's performance. There is no assurance the fund will meet its investment objective. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The fund may take temporary defensive positions; in such a case, the fund will not be pursuing its principal investment strategies. The following is a summary description of principal risks (in alphabetical order) of investing in the fund (either directly or through its investments in underlying funds). Each risk described below may not apply to each underlying fund and an underlying fund may be subject to additional or different risks than those described below. You may lose money if you invest in this fund.

• Asset Allocation – The Portfolio Construction Manager allocates the fund's assets among various asset classes and underlying funds. These allocations may be unsuccessful in maximizing the fund's return and/or avoiding investment losses, and may cause the fund to underperform.

• Commodities – To the extent the fund invests in commodities or instruments whose performance is linked to the price of an underlying commodity or commodity index, the fund will be subject to the risks of investing in commodities, including regulatory, economic and political developments, weather events and natural disasters and market disruptions. The fund's investment exposure to the commodities markets may subject the fund to greater volatility than investments in more traditional securities, such as stocks and bonds. Commodities and commodity-linked investments may be less liquid than other investments. Commodity-linked investments are subject to the credit risks associated with the issuer, and their values may decline substantially if the issuer's creditworthiness deteriorates.

• Counterparty – The fund will be subject to credit risk (that is, where changes in an issuer's financial strength or credit rating may affect an instrument's value) with respect to the amount it expects to receive from counterparties to derivatives, repurchase agreements and other financial contracts entered into by the fund or held by special purpose or structured vehicles. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the value of your investment in the fund may decline.

• 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 defaults or is downgraded, or is perceived to be less creditworthy, or if the value of any underlying assets declines, the value of your investment will typically decline. Below investment grade, high-yield debt securities (commonly known as "junk bonds") have a higher risk of default and are considered speculative. Subordinated securities are more likely to suffer a credit loss than non-subordinated securities of the same issuer and will be disproportionately affected by a default, downgrade or perceived decline in creditworthiness.

• Currency – The value of investments in securities denominated in foreign currencies increases or decreases as the rates of exchange between those currencies and the U.S. dollar change. Currency conversion costs and currency fluctuations could reduce or eliminate investment gains or add to investment losses. Currency exchange rates can be volatile, and are affected by factors such as general economic conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls, and speculation.

• Derivatives – Using derivatives exposes the fund to additional risks and can increase fund losses and reduce opportunities for gains when market prices, interest rates or the derivatives themselves behave in a way not anticipated by the fund. Using derivatives also can have a leveraging effect and increase fund volatility. The fund may also have to sell assets at inopportune times to satisfy its obligations. Derivatives may be difficult to sell, unwind or value, and the counterparty may default on its obligations to the fund. The fund's investments in derivative instruments may involve a small investment relative to the amount of investment exposure assumed and may result in losses exceeding the amounts invested in those instruments. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The U.S. government is in the process of adopting and implementing regulations governing derivatives markets, including mandatory clearing of certain derivatives, margin and reporting requirements. The ultimate impact of the regulations remains unclear. Additional regulation of derivatives may make them more costly, may limit their availability, may disrupt markets or may otherwise adversely affect their value or performance.

• Emerging Markets – Investments in the securities of issuers located in or principally doing business in emerging markets are subject to foreign investments risks. These risks are greater for investments in issuers in emerging market countries. Emerging market countries tend to have economic, political and legal systems that are less fully developed and are less stable than those of more developed countries. Emerging market securities are often particularly sensitive to market movements because their market prices tend to reflect speculative expectations. Low trading volumes may result in a lack of liquidity and in extreme price volatility.

• Equity Securities – Equity securities represent an ownership interest in an issuer, rank junior in a company's capital structure and consequently may entail greater risk of loss than debt securities. Equity securities include common and preferred stocks. Stock markets are volatile. The price of equity securities fluctuates based on changes in a company's financial condition and overall market and economic conditions. If the market prices of the equity securities owned by the fund fall, the value of your investment in the fund will decline.

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

• Fixed-Income Securities – The market prices 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 market 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. When market prices fall, the value of your investment will go down. The value of your investment will generally go down when interest rates rise. Interest rates have been at historically low levels, so the fund faces a heightened risk that interest rates may rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities.

• Foreign Investments – Investing in securities of foreign issuers or issuers with significant exposure to foreign markets involves additional risk. Foreign countries in which the fund may invest may have markets that are less liquid, less regulated and more volatile than U.S. markets. The value of the fund's investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable government actions, political or financial instability or other adverse economic or political developments. Lack of information and weaker accounting standards also may affect the value of these securities.

• High-Yield Debt Securities – High-yield debt securities, commonly referred to as "junk bonds," are securities that are rated below "investment grade" (that is, securities rated below Baa/BBB) or, if unrated, determined to be below investment grade by the sub-adviser. Changes in interest rates, the market's perception of the issuers and the creditworthiness of the issuers may significantly affect the value of these bonds. Junk bonds are considered speculative, have a higher risk of default, tend to be less liquid and may be more difficult to value than higher grade securities. Junk bonds tend to be volatile and more susceptible to adverse events and negative sentiments.

• Interest Rate – Interest rates in the U.S. have been at historically low levels, so the fund faces a heightened risk that interest rates may rise. The value of fixed income securities generally goes down when interest rates rise, and therefore the value of your investment in the fund may also go down. Debt securities have varying levels of sensitivity to changes in interest rates. A rise in rates tends to have a greater impact on the prices of longer term or duration securities.

• Leveraging – The value of your investment may be more volatile to the extent that the fund borrows or uses derivatives or other investments that have a leveraging effect on the fund. Other risks also will be compounded. This is 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 had. The use of leverage is considered to be a speculative investment practice and may result in the loss of a substantial amount, and possibly all, of the fund's assets. The fund also may have to sell assets at inopportune times to satisfy its obligations.

• Liquidity – The fund may make investments that are illiquid or that become illiquid after purchase. The liquidity and value of investments can deteriorate rapidly and those investments may be difficult or impossible to sell, particularly during times of market turmoil. These illiquid investments may also be difficult to 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 loss.

• Manager – The fund is subject to the risk that the Portfolio Construction Manager's judgments and investment decisions, as well as the methods, tools, resources, information and data, and the analyses employed or relied on by the Portfolio Construction Manager to make those judgments and decisions may be incorrect or otherwise may not produce the desired results. This could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.

• Market – The market prices of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, inflation, changes in interest rates or currency rates, lack of liquidity in the markets or adverse investor sentiment. Adverse market conditions may be prolonged and may not have the same impact on all types of securities. Market prices of securities also may go down due to events or conditions that affect particular sectors, industries or issuers. When market prices fall, the value of your investment will go down. The fund may experience a substantial or complete loss on any individual security. Financial markets in the U.S., Europe and elsewhere have experienced increased volatility and decreased liquidity since the global financial crisis began in 2008. Governmental and non-governmental issuers defaulted on, or were forced to restructure, their debts. These market conditions may continue, worsen or spread. The U.S. government and the Federal Reserve, as well as certain foreign governments and their central banks have taken steps to support financial markets, including keeping interest rates at historically low levels. More recently, the Federal Reserve has reduced its market support activities. Further reduction or withdrawal of this support, or other related efforts in response to the crisis could negatively affect financial markets generally and increase market volatility as well as result in higher interest rates and reduce the value and liquidity of certain securities. This environment could make identifying investment risks and opportunities especially difficult for the Portfolio Construction Manager. 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. In addition, policy and legislative changes in the United States and in other countries are affecting many aspects of financial regulation, and in some instances may contribute to decreased liquidity and increased volatility in the financial markets.

• Prepayment or Call – Many issuers have a right to prepay their securities. If interest rates fall, an issuer may exercise this right. If this happens, the fund will not benefit from the rise in market price 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 the prepaid security. The fund also may lose any premium it paid on the security.

• REITs – Investing in real estate investment trusts ("REITs") involves unique risks. When the fund invests in REITs, it is subject to risks generally associated with investing in real estate. A REIT's performance depends on the types and locations of the properties it owns, how well it manages those properties and cash flow. REITs may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets. In addition to its own expenses, the fund will indirectly bear its proportionate share of any management and other expenses paid by REITs in which it invests. REITs are subject to a number of highly technical tax-related rules and requirements; and the failure to qualify as a REIT could result in corporate-level taxation, significantly reducing the return on an investment to the fund.

• Underlying Funds – Because the fund invests its assets in various underlying funds, its ability to achieve its investment objective depends largely on the performance of the underlying funds in which it invests. Each of the underlying funds in which the fund may invest has its own investment risks, and those risks can affect the value of the underlying funds' shares and therefore the value of the fund's investments. There can be no assurance that the investment objective of any underlying fund will be achieved. To the extent that the fund invests more of its assets in one underlying fund than in another, the fund will have greater exposure to the risks of that underlying fund. In addition, the fund will bear a pro rata portion of the operating expenses of the underlying funds in which it invests. The "Underlying Funds" section of the fund's prospectus identifies certain risks of each underlying fund.

• 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. Although the U.S. government has provided financial support to the Federal National Mortgage Association ("Fannie Mae") and the Federal Home Loan Mortgage Corporation ("Freddie Mac") in the past, there can be no assurance that it will support these or other government sponsored entities in the future.

• 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.

Risk Lose Money [Text]

rr_RiskLoseMoney

You may lose money if you invest in this fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance:

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance, as well as comparison to one or more secondary indices. The bar chart does not reflect the impact of sales charges, which, if reflected, would lower the returns. The table includes deduction of applicable sales charges.Absent any limitation of the fund’s expenses, total returns would be lower. In the “10 Years or Since Inception” column of the table, returns are shown for ten years or since inception of the share class, whichever is less. Index returns are for ten years.

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/index.html or by calling 1-888-233-4339.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance, as well as comparison to one or more secondary indices.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1-888-233-4339

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.transamerica.com/individual/products/mutual-funds/performance/index.html

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

As with all mutual funds, past performance (before and after taxes) is not a prediction of future results.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns (calendar years ended December 31) - Class A

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Return
Best Quarter:	06/30/2009	13.29%
Worst Quarter:	12/31/2008	-13.46%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (periods ended December 31, 2014)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The table includes deduction of applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are presented for only one class and returns for other classes will vary.

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 will vary.

Transamerica Asset Allocation - Moderate Portfolio | A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.50%

Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.15%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.83%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.33%

^[1]

1 year

rr_ExpenseExampleYear01

678

3 years

rr_ExpenseExampleYear03

948

5 years

rr_ExpenseExampleYear05

1,239

10 years

rr_ExpenseExampleYear10

2,063

1 year

rr_ExpenseExampleNoRedemptionYear01

678

3 years

rr_ExpenseExampleNoRedemptionYear03

948

5 years

rr_ExpenseExampleNoRedemptionYear05

1,239

10 years

rr_ExpenseExampleNoRedemptionYear10

2,063

2005

rr_AnnualReturn2005

6.04%

2006

rr_AnnualReturn2006

11.52%

2007

rr_AnnualReturn2007

7.81%

2008

rr_AnnualReturn2008

(26.38%)

2009

rr_AnnualReturn2009

25.30%

2010

rr_AnnualReturn2010

11.27%

2011

rr_AnnualReturn2011

(1.63%)

2012

rr_AnnualReturn2012

11.04%

2013

rr_AnnualReturn2013

13.85%

2014

rr_AnnualReturn2014

4.36%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

13.29%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(13.46%)

1 Year

rr_AverageAnnualReturnYear01

4.36%

5 Years

rr_AverageAnnualReturnYear05

7.63%

10 Years

rr_AverageAnnualReturnYear10

5.44%

Since Inception

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2002

Transamerica Asset Allocation - Moderate Portfolio | B

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

5.00%

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.20%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.83%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.13%

^[1]

1 year

rr_ExpenseExampleYear01

716

3 years

rr_ExpenseExampleYear03

967

5 years

rr_ExpenseExampleYear05

1,244

10 years

rr_ExpenseExampleYear10

2,258

1 year

rr_ExpenseExampleNoRedemptionYear01

216

3 years

rr_ExpenseExampleNoRedemptionYear03

667

5 years

rr_ExpenseExampleNoRedemptionYear05

1,144

10 years

rr_ExpenseExampleNoRedemptionYear10

2,258

1 Year

rr_AverageAnnualReturnYear01

3.51%

5 Years

rr_AverageAnnualReturnYear05

6.85%

10 Years

rr_AverageAnnualReturnYear10

4.87%

Since Inception

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2002

Transamerica Asset Allocation - Moderate Portfolio | C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.12%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.83%

Total annual fund operating expenses

rr_ExpensesOverAssets

2.05%

^[1]

1 year

rr_ExpenseExampleYear01

308

3 years

rr_ExpenseExampleYear03

643

5 years

rr_ExpenseExampleYear05

1,103

10 years

rr_ExpenseExampleYear10

2,379

1 year

rr_ExpenseExampleNoRedemptionYear01

208

3 years

rr_ExpenseExampleNoRedemptionYear03

643

5 years

rr_ExpenseExampleNoRedemptionYear05

1,103

10 years

rr_ExpenseExampleNoRedemptionYear10

2,379

1 Year

rr_AverageAnnualReturnYear01

3.62%

5 Years

rr_AverageAnnualReturnYear05

6.92%

10 Years

rr_AverageAnnualReturnYear10

4.77%

Since Inception

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 11, 2002

Transamerica Asset Allocation - Moderate Portfolio | I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.15%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.83%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.08%

^[1]

1 year

rr_ExpenseExampleYear01

110

3 years

rr_ExpenseExampleYear03

343

5 years

rr_ExpenseExampleYear05

595

10 years

rr_ExpenseExampleYear10

1,317

1 year

rr_ExpenseExampleNoRedemptionYear01

110

3 years

rr_ExpenseExampleNoRedemptionYear03

343

5 years

rr_ExpenseExampleNoRedemptionYear05

595

10 years

rr_ExpenseExampleNoRedemptionYear10

1,317

1 Year

rr_AverageAnnualReturnYear01

4.55%

5 Years

rr_AverageAnnualReturnYear05

7.95%

10 Years

rr_AverageAnnualReturnYear10

Since Inception

rr_AverageAnnualReturnSinceInception

8.11%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2009

Transamerica Asset Allocation - Moderate Portfolio | R

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

0.10%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.13%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.83%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.56%

^[1]

1 year

rr_ExpenseExampleYear01

159

3 years

rr_ExpenseExampleYear03

493

5 years

rr_ExpenseExampleYear05

850

10 years

rr_ExpenseExampleYear10

1,856

1 year

rr_ExpenseExampleNoRedemptionYear01

159

3 years

rr_ExpenseExampleNoRedemptionYear03

493

5 years

rr_ExpenseExampleNoRedemptionYear05

850

10 years

rr_ExpenseExampleNoRedemptionYear10

1,856

1 Year

rr_AverageAnnualReturnYear01

4.07%

5 Years

rr_AverageAnnualReturnYear05

7.41%

10 Years

rr_AverageAnnualReturnYear10

Since Inception

rr_AverageAnnualReturnSinceInception

5.27%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 15, 2006

Transamerica Asset Allocation - Moderate Portfolio | Return after taxes on distributions | A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.67%

5 Years

rr_AverageAnnualReturnYear05

6.32%

10 Years

rr_AverageAnnualReturnYear10

4.17%

Since Inception

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2002

Transamerica Asset Allocation - Moderate Portfolio | Return after taxes on distributions and sale of fund shares | A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.02%

5 Years

rr_AverageAnnualReturnYear05

5.73%

10 Years

rr_AverageAnnualReturnYear10

4.02%

Since Inception

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2002

Transamerica Asset Allocation - Moderate Portfolio | Wilshire 5000 Total Market Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

12.10%

5 Years

rr_AverageAnnualReturnYear05

15.64%

10 Years

rr_AverageAnnualReturnYear10

8.13%

Since Inception

rr_AverageAnnualReturnSinceInception

Transamerica Asset Allocation - Moderate Portfolio | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.97%

5 Years

rr_AverageAnnualReturnYear05

4.45%

10 Years

rr_AverageAnnualReturnYear10

4.71%

Since Inception

rr_AverageAnnualReturnSinceInception

[1] Total annual fund operating expenses do not correlate to the ratios of expenses to average net assets in the financial highlights table, which do not include acquired (i.e., underlying) funds' fees and expenses and do not reflect the reduction of 0.05% in the distribution and services (12b-1) fees on Class A shares effective March 1, 2014 for an entire fiscal year.