Label

Element

Value

Risk/Return:

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Registrant Name

dei_EntityRegistrantName

TRANSAMERICA FUNDS

Prospectus Date

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Mar. 01, 2015

Class I2 | Transamerica Concentrated Growth

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

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TRANSAMERICA CONCENTRATED GROWTH

Objective [Heading]

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Investment Objective:

Objective, Primary [Text Block]

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Seeks to achieve long-term growth of capital.

Expense [Heading]

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Fees and Expenses:

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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

Portfolio Turnover [Heading]

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Portfolio Turnover:

Portfolio Turnover [Text Block]

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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.

For the period beginning January 1, 2014 and ending October 31, 2014, the portfolio turnover rate for the fund was 18% of the average value of its portfolio.

Portfolio turnover rate includes that of The Torray Resolute Fund (the “predecessor fund”) for the period beginning January 1, 2014 and ending February 28, 2104.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

18.00%

Other Expenses, New Fund, Based on Estimates [Text]

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Other expenses are based on estimates for the current fiscal year.

Expense Example [Heading]

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Example:

Expense Example Narrative [Text Block]

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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]

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Principal Investment Strategies:

Strategy Narrative [Text Block]

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Under normal circumstances, the fund’s sub-adviser, Torray LLC (the “sub-adviser”), will invest at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in equity securities of large capitalization companies with proven records of increasing earnings on a consistent and sustainable basis. The fund considers large capitalization companies to be those companies with market capitalizations of $5 billion or more at the time of purchase. Sustainable growth is a product of businesses generally characterized by durable competitive advantages, high returns on and efficient use of capital, low financial and operating volatility, high levels of recurring revenue and low exposure to cyclical trends. Companies are reviewed on a fundamental basis in the context of long-term secular themes.

The fund employs a concentrated approach, investing in 25 to 30 stocks, with a long-term orientation and a quality focus. Correlation of securities and underlying businesses is considered in an effort to minimize risk within the fund. Initial positions range from 2% to 3% of assets and may be increased over time to between 5% and 7%. Individual positions will not exceed 7%. Sector weights are independent of benchmarks, ranging from 0% to 35%, and cash is not employed in a tactical or strategic manner.

Risk control is an integral part of the sub-adviser’s process. In the context of security selection, the focus is on quality, which is defined as businesses demonstrating consistent financial and operating metrics through a full business cycle, high returns on capital, appropriate leverage and reasonable valuation. Risk control is also a primary part of portfolio construction. In order to achieve effective diversification, correlation among existing and prospective holdings is measured through multiple periods, assigning preference to issues exhibiting low correlation to the portfolio and among sectors. Excess (positive or negative) relative performance also initiates a review of a security by the sub-adviser.

Positions are reduced or sold if they exhibit excess valuation, reach sector or position limits, show increased business volatility, are replaced by higher conviction ideas or fail to fulfill the original investment thesis.

Risk [Heading]

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Principal Risks:

Risk Narrative [Text Block]

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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. You may lose money if you invest in this fund.

• 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.

• Focused Investing – To the extent the fund invests in one or more countries, regions, sectors or industries, or in a limited number of issuers, the fund will be more susceptible to negative events affecting those countries, regions, sectors, industries or issuers. Local events, such as political upheaval, financial troubles, or natural disasters may disrupt a country’s or region’s securities markets. Geographic risk is especially high in emerging markets.

• 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 may be particularly susceptible to larger price swings or to adverse developments. 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.

• Manager – The fund is subject to the risk that the sub-adviser’s judgments and investment decisions, as well as the methods, tools, resources, information and data, and the analyses employed or relied on by the sub-adviser 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 sub-adviser. 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.

• Portfolio Selection – The value of your investment may decrease if the sub-adviser’s judgment about the quality, relative yield, value or market trends affecting a particular security or issuer, industry, sector, region or market segment, or about the economy or interest rates is incorrect.

Risk Lose Money [Text]

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You may lose money if you invest in this fund.

Bar Chart and Performance Table [Heading]

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Performance:

Performance Narrative [Text Block]

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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 limitation of the fund’s expenses, total returns would be lower. Index returns are since inception of the predecessor fund.

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.

The fund acquired the assets and assumed the liabilities of the predecessor fund on March 1, 2014, and the predecessor fund is the accounting and performance survivor of the reorganization. This means that the predecessor fund’s performance and financial history have been adopted by the fund. In the reorganization, former shareholders of the predecessor fund received Class I shares of the fund. Accordingly, the performance of Class I shares of the fund includes the performance of the predecessor fund. The performance of the predecessor fund has not been restated to reflect the estimated annual operating expenses of Class I shares. The inception date shown in the table for Class I shares is that of the predecessor fund.

The past performance shown below is for Class I shares, which are not available through this prospectus. Although Class I2 shares would have similar annual returns to Class I shares because the classes are invested in the same portfolio of securities, the returns for Class I2 shares would be higher than Class I shares because of the lower expenses paid by Class I2 shares. Performance information for Class I2 shares will be included after Class I2 has been in operation for one complete calendar year.

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.

Performance One Year or Less [Text]

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Performance information for Class I2 shares will be included after Class I2 has been in operation for one complete calendar year.

Performance Availability Phone [Text]

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1-888-233-4339

Performance Availability Website Address [Text]

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

Performance Past Does Not Indicate Future [Text]

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

Bar Chart [Heading]

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

Bar Chart Does Not Reflect Sales Loads [Text]

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

Bar Chart Closing [Text Block]

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	Quarter Ended	Return
Best Quarter:	03/31/2012	15.66%
Worst Quarter:	09/30/2011	-13.01%

Bar Chart, Returns for Class Not Offered in Prospectus [Text]

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The past performance shown below is for Class I shares, which are not available through this prospectus. Although Class I2 shares would have similar annual returns to Class I shares because the classes are invested in the same portfolio of securities, the returns for Class I2 shares would be higher than Class I shares because of the lower expenses paid by Class I2 shares.

Performance Table Heading

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

Performance Table Does Reflect Sales Loads

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The table includes deduction of applicable sales charges.

Performance Table Uses Highest Federal Rate

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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

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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

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Russell Investment Group is the source and owner of the trademarks, service marks and copyrights related to the Russell indexes. Russell^® is a trademark of Russell Investment Group.

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.

Class I2 | Transamerica Concentrated Growth | I2

Risk/Return:

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

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none

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

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

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0.65%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

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0.12%

^[1]

Total annual fund operating expenses

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0.77%

1 year

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79

3 years

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246

5 years

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428

10 years

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954

Class I2 | Transamerica Concentrated Growth | I

Risk/Return:

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2011

rr_AnnualReturn2011

2.23%

2012

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20.28%

2013

rr_AnnualReturn2013

31.84%

2014

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8.12%

Highest Quarterly Return, Label

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Best Quarter:

Highest Quarterly Return, Date

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Mar. 31, 2012

Highest Quarterly Return

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15.66%

Lowest Quarterly Return, Label

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Worst Quarter:

Lowest Quarterly Return, Date

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Sep. 30, 2011

Lowest Quarterly Return

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(13.01%)

1 Year

rr_AverageAnnualReturnYear01

8.12%

Since Inception

rr_AverageAnnualReturnSinceInception

15.05%

Inception Date

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Dec. 31, 2010

Class I2 | Transamerica Concentrated Growth | Return after taxes on distributions | I

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.28%

Since Inception

rr_AverageAnnualReturnSinceInception

14.64%

Inception Date

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Dec. 31, 2010

Class I2 | Transamerica Concentrated Growth | Return after taxes on distributions and sale of fund shares | I

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.18%

Since Inception

rr_AverageAnnualReturnSinceInception

11.95%

Inception Date

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Dec. 31, 2010

Class I2 | Transamerica Concentrated Growth | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

13.05%

Since Inception

rr_AverageAnnualReturnSinceInception

15.53%

[1] Other expenses are based on estimates for the current fiscal year.