Label

Element

Value

Risk/Return:

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Registrant Name

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ASTON FUNDS

Prospectus Date

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Feb. 28, 2015

ASTON/RIVER ROAD SMALL CAP VALUE FUND

Risk/Return:

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Risk/Return [Heading]

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ASTON/River Road Small Cap Value Fund

Objective [Heading]

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INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

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The Fund seeks to provide long-term capital appreciation.

Expense [Heading]

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FEES AND EXPENSES

Expense Narrative [Text Block]

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The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 66.22%.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

66.22%

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 shows the operating expenses you would incur as a shareholder if you invested $10,000 in the Fund over the time periods shown and you redeem all your shares at the end of those periods. The example assumes that the average annual return was 5% and operating expenses remained the same.

Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:

Strategy [Heading]

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PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

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Under normal conditions, the Fund invests at least 80% of its assets in common stocks and other equity securities of small-cap companies that the subadviser believes are undervalued. Value investing involves buying stocks that are out of favor and/or undervalued in comparison to their peers or their prospects for growth. The Fund considers companies with market capitalizations below $3 billion at the time of acquisition to be small-cap. The Fund may also invest in mid-cap stocks, which the Fund considers to be companies with market capitalizations between $3 billion and $6 billion at the time of acquisition. The Fund may also invest in real estate investment trusts (“REITs”), convertible preferred stocks, convertible bonds, investment companies (such as exchange-traded funds (“ETFs”) and closed-end funds) and foreign securities (directly and through depositary receipts). Using systematic and dynamic internal research, the subadviser narrows the field of small-cap and mid-cap companies into a more refined working universe. The subadviser employs a value-driven, bottom-up fundamental approach that seeks to identify certain characteristics including:

• Priced at a discount to absolute value
• Attractive business model
• Shareholder-oriented management
• Financial strength
• Undiscovered, underfollowed or misunderstood companies

To manage risk, the subadviser employs a strategy of balanced diversification, and adheres to a structured sell discipline.

Risk [Heading]

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PRINCIPAL RISKS

Risk Narrative [Text Block]

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You could lose money by investing in the Fund. There can be no assurance that the Fund’s investment objective will be achieved. The following is a summary of the principal risks of investing in the Fund.

Convertible Securities Risk. Convertible preferred stocks, which are convertible into shares of the issuer’s common stock and pay regular dividends, and convertible bonds, which are convertible into shares of the issuer’s common stock and bear interest, are subject to the risks of equity securities and fixed income securities. The lower the conversion premium, the more likely the price of the convertible security will follow the price of the underlying common stock. Conversely, higher premium convertibles are more likely to exhibit the behavior of bonds because the likelihood of conversion is lower, which may cause their prices to fall as interest rates rise.

The value of a convertible security is also affected by the credit quality of the issuer and any call provisions. There is the risk that the issuer of convertible preferred stock will not be able to make dividend payments or that the issuer of a convertible bond will not be able to make principal and/or interest payments.

Foreign Securities Risk. Investing in the securities of foreign issuers involves special risks and considerations in addition to those typically associated with investing in U.S. companies. The securities of foreign companies may be less liquid and their prices may fluctuate more widely than those traded in U.S. markets. Foreign companies and markets may also have less governmental supervision. There may be difficulty in enforcing contractual obligations against, and little public information about, the companies. Trades typically take more time to settle and clear, and the costs of buying and selling foreign securities are generally higher than the costs associated with buying and selling securities traded in U.S. markets.

The values of the foreign securities held by the Fund may be affected by changes in currency exchange rates or control regulations. If a local currency gains against the U.S. dollar, the value of a holding denominated in that currency increases in U.S. dollar terms. If a local currency declines against the U.S. dollar, the value of the holding decreases in U.S. dollar terms. Changes in economic, tax or foreign investment policies, or other political, governmental or economic actions can adversely affect the value of the foreign securities held by the Fund. In foreign countries, accounting, auditing and financial reporting standards and other regulatory practices and requirements are generally different from those required for U.S. companies. Investments in securities of foreign issuers may also be subject to foreign withholding and other taxes.

Investment Company Risk. The Fund may invest in securities of other investment companies, including ETFs, open-end funds and closed-end funds. The risks of investing in other investment companies typically reflect the risks of the types of securities in which those investment companies invest. Investments in ETFs and closed-end funds are subject to the additional risk that shares of the fund may trade at a premium or discount to their net asset value per share. When the Fund invests in another investment company, shareholders of the Fund bear their proportionate share of the other investment company’s fees and expenses as well as their share of the Fund’s fees and expenses.

Liquidity Risk. When there is no willing buyer and a security cannot be readily sold at the desired time or price, the Fund may need to accept a lower price or may not be able to sell the security at all. An inability to sell securities, at the Fund’s desired price or at all, can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities. Less liquid securities are more difficult to dispose of at their recorded values and are subject to wider bid-ask spreads and volatility.

Manager Risk. The performance of the Fund is dependent upon the investment adviser’s skill in selecting managers and the subadviser’s skill in making appropriate investments. As a result, the Fund may underperform its benchmark or its peers.

Market Risk. The Fund’s share price can move down in response to stock market conditions, changes in the economy or changes in a particular company’s stock price. An individual stock may decline in value even when the value of stocks in general is rising.

REIT Risk. Securities of REITs may be affected by changes in the values of their underlying properties. REITs depend generally on their ability to generate cash flow to make distributions to shareholders or unitholders, which may be subject to defaults by borrowers and self-liquidations. Some REITs may have limited diversification and may be subject to risks inherent in investments in a limited number of properties, in a narrow geographic area, or in a single property type. Real estate prices are also affected by general economic conditions. When growth is slowing, demand for property decreases and prices and rents may decline. High or rising interest rates, which result in high or rising mortgage and financing costs, may restrain buying and selling activity, reducing the appeal of real estate investments. Distributions from REITs generally are taxed as ordinary income for federal income tax purposes.

Small-Cap and Mid-Cap Company Risk. Investing in securities of small-cap and mid-cap companies may involve greater risks than investing in securities of larger, more established companies. Small-cap and mid-cap companies generally have limited product lines, markets, and financial resources. Their securities may trade less frequently and in more limited volumes than the securities of larger, more established companies. Also, small-cap and mid-cap companies are typically subject to greater changes in earnings and business prospects than larger companies. As a result, their stock prices may experience greater volatility and may decline more than those of large-cap companies in market downturns.

Value Style Risk. Value investing involves buying stocks that the subadviser believes are out of favor and/or undervalued in comparison to their peers or their prospects for growth. Typically, the valuation levels of value stocks are less than those of growth stocks. Because different types of stocks go in and out of favor with prevailing market and economic conditions, the Fund’s performance may be adversely affected when value stocks underperform.

Risk Lose Money [Text]

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You could lose money by investing in the Fund.

Bar Chart and Performance Table [Heading]

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FUND PERFORMANCE

Performance Narrative [Text Block]

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The bar chart shows how the performance of the Class N shares of the Fund has varied from year to year over the periods shown. Class N shares and Class I shares are invested in the same portfolio of securities, so the annual returns would differ only to the extent that the classes have different expenses. The annual returns of the Class I shares would be higher than the returns of the Class N shares due to 12b-1 fees paid by Class N shares. This information may help illustrate the risks of investing in the Fund. The Fund makes updated performance information available on the Fund’s website, www.astonfunds.com, or by calling toll-free 800-992-8151. As with all mutual funds, past performance (before and after taxes) does not guarantee future performance.

Performance Information Illustrates Variability of Returns [Text]

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The bar chart shows how the performance of the Class N shares of the Fund has varied from year to year over the periods shown.

The following table indicates how the Fund’s average annual returns for different calendar periods compared to the returns of a broad-based securities market index.

Performance Availability Phone [Text]

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800-992-8151

Performance Availability Website Address [Text]

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www.astonfunds.com

Performance Past Does Not Indicate Future [Text]

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As with all mutual funds, past performance (before and after taxes) does not guarantee future performance.

Bar Chart [Heading]

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Class N Shares
Calendar Year Total Return

Bar Chart Closing [Text Block]

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Best quarter:	06/09	16.81	%
Worst quarter:	12/08	(22.89	)%

Performance Table Heading

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

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical 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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After-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

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After-tax returns are shown only for Class N shares. After-tax returns for Class I shares will vary.

Performance Table Explanation after Tax Higher

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In some instances, the “Return After Taxes on Distributions and Sales of Fund Shares” may be greater than “Return Before Taxes” because the investor is assumed to be able to use the capital loss of the sale of Fund shares to offset other taxable gains.

Performance Table Narrative

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The following table indicates how the Fund’s average annual returns for different calendar periods compared to the returns of a broad-based securities market index.

Performance Table Closing [Text Block]

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some instances, the “Return After Taxes on Distributions and Sales of Fund Shares” may be greater than “Return Before Taxes” because the investor is assumed to be able to use the capital loss of the sale of Fund shares to offset other taxable gains. After-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class N shares. After-tax returns for Class I shares will vary.

ASTON/RIVER ROAD SMALL CAP VALUE FUND | Class N Shares

Risk/Return:

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Management Fees

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0.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.18%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.35%

1 Year

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137

3 Years

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428

5 Years

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739

10 Years

rr_ExpenseExampleYear10

1,624

2006

rr_AnnualReturn2006

30.83%

2007

rr_AnnualReturn2007

(5.96%)

2008

rr_AnnualReturn2008

(30.23%)

2009

rr_AnnualReturn2009

21.10%

2010

rr_AnnualReturn2010

19.08%

2011

rr_AnnualReturn2011

(2.28%)

2012

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13.40%

2013

rr_AnnualReturn2013

30.73%

2014

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(0.44%)

Highest Quarterly Return, Label

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Best quarter:

Highest Quarterly Return, Date

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Jun. 30, 2009

Highest Quarterly Return

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16.81%

Lowest Quarterly Return, Label

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Worst quarter:

Lowest Quarterly Return, Date

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Dec. 31, 2008

Lowest Quarterly Return

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(22.89%)

1 Year

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(0.44%)

5 Years

rr_AverageAnnualReturnYear05

11.42%

Since Inception

rr_AverageAnnualReturnSinceInception

7.26%

Inception Date

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Jun. 28, 2005

ASTON/RIVER ROAD SMALL CAP VALUE FUND | Class I Shares

Risk/Return:

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Management Fees

rr_ManagementFeesOverAssets

0.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

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0.18%

Acquired Fund Fees and Expenses

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0.02%

Total Annual Fund Operating Expenses

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1.10%

1 Year

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112

3 Years

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350

5 Years

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606

10 Years

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1,340

1 Year

rr_AverageAnnualReturnYear01

(0.23%)

5 Years

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11.70%

Since Inception

rr_AverageAnnualReturnSinceInception

4.41%

Inception Date

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Dec. 13, 2006

ASTON/RIVER ROAD SMALL CAP VALUE FUND | Return After Taxes on Distributions | Class N Shares

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

(4.24%)

5 Years

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9.19%

Since Inception

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5.97%

Inception Date

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Jun. 28, 2005

ASTON/RIVER ROAD SMALL CAP VALUE FUND | Return After Taxes on Distributions and Sale of Fund Shares | Class N Shares

Risk/Return:

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1 Year

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2.13%

5 Years

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8.97%

Since Inception

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5.76%

Inception Date

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Jun. 28, 2005

ASTON/RIVER ROAD SMALL CAP VALUE FUND | Russell 2000 Value Index (Reflects no deduction for taxes, expenses or fees. Index return since inception for Class N shares is computed from June 30, 2005. Index return for Class I shares, since inception, computed from November 30, 2006, is 5.31%.) | Class N Shares

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

4.22%

5 Years

rr_AverageAnnualReturnYear05

14.26%

Since Inception

rr_AverageAnnualReturnSinceInception

7.16%

Inception Date

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Jun. 30, 2005

ASTON/RIVER ROAD SMALL CAP VALUE FUND | Russell 2000 Value Index (Reflects no deduction for taxes, expenses or fees. Index return since inception for Class N shares is computed from June 30, 2005. Index return for Class I shares, since inception, computed from November 30, 2006, is 5.31%.) | Class I Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.22%

5 Years

rr_AverageAnnualReturnYear05

14.26%

Since Inception

rr_AverageAnnualReturnSinceInception

5.31%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2006