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/TAMRO SMALL CAP FUND

Risk/Return:

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Risk/Return [Heading]

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ASTON/TAMRO Small Cap 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 69.72%.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

69.72%

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 market conditions, the Fund invests at least 80% of its assets in a blended portfolio of growth and value stocks of small-cap companies. The subadviser seeks opportunities across the growth/value spectrum, resulting in what is generally considered a “core” portfolio. The Fund generally defines a small-cap company as one having a market capitalization, at the time of acquisition, within the range of market capitalizations of companies constituting the Russell 2000 Index. The composition, and thus the market capitalization range, of the Russell 2000 Index changes periodically. As of December 31, 2014, the market capitalization range of the Russell 2000 Index was approximately $19 million to $7.3 billion.

The subadviser’s investment process focuses on bottom-up stock selection with the goal of identifying companies that possess a sustainable competitive advantage combined with an attractive valuation. A sustainable competitive advantage may be derived from a unique product or service offering, a capable and experienced management team, and financial flexibility in allocating capital.

Through the use of both qualitative and quantitative evaluation, the subadviser seeks securities that it believes meet the specific criteria of one of three investment categories:

• Leaders (historically leading market share and above average profitability)
• Laggards (failed to create value in recent years, but have the potential for significant gains in profitability as new or reinvigorated management seeks to restructure operations)
• Innovators (commitment to the introduction of new or innovative products or services)

The Fund may invest in real estate investment trusts (“REITs”), foreign securities (directly and through depositary receipts), convertible preferred stocks, convertible bonds, securities outside the small-cap range and cash-equivalent securities.

To manage risk, the subadviser limits position sizes, diversifies across market sectors 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 convertible securities 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.

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.

Style Risk. The subadviser’s stock selection strategy includes both value and growth factors. During periods when value investing significantly outperforms growth investing, or during periods when growth investing significantly outperforms value investing, the Fund may underperform funds that exclusively employ the favored investing style.

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:	03/06	19.41	%
Worst quarter:	12/08	(25.91	)%

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/TAMRO SMALL CAP FUND | Class N Shares

Risk/Return:

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Management Fees

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0.90%

Distribution and Service (12b-1) Fees

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0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.16%

Total Annual Fund Operating Expenses

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1.31%

1 Year

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133

3 Years

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415

5 Years

rr_ExpenseExampleYear05

718

10 Years

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1,579

2005

rr_AnnualReturn2005

2.34%

2006

rr_AnnualReturn2006

27.84%

2007

rr_AnnualReturn2007

0.27%

2008

rr_AnnualReturn2008

(33.19%)

2009

rr_AnnualReturn2009

32.32%

2010

rr_AnnualReturn2010

31.26%

2011

rr_AnnualReturn2011

(4.24%)

2012

rr_AnnualReturn2012

16.69%

2013

rr_AnnualReturn2013

27.72%

2014

rr_AnnualReturn2014

0.20%

Highest Quarterly Return, Label

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Best quarter:

Highest Quarterly Return, Date

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Mar. 31, 2006

Highest Quarterly Return

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19.41%

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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(25.91%)

1 Year

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0.20%

5 Years

rr_AverageAnnualReturnYear05

13.42%

10 Years

rr_AverageAnnualReturnYear10

8.09%

Since Inception

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10.75%

Inception Date

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Nov. 30, 2000

ASTON/TAMRO SMALL CAP FUND | Class I Shares

Risk/Return:

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Management Fees

rr_ManagementFeesOverAssets

0.90%

Distribution and Service (12b-1) Fees

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none

Other Expenses

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0.16%

Total Annual Fund Operating Expenses

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1.06%

1 Year

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108

3 Years

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337

5 Years

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585

10 Years

rr_ExpenseExampleYear10

1,294

1 Year

rr_AverageAnnualReturnYear01

0.45%

5 Years

rr_AverageAnnualReturnYear05

13.70%

10 Years

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Since Inception

rr_AverageAnnualReturnSinceInception

8.72%

Inception Date

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Jan. 04, 2005

ASTON/TAMRO SMALL CAP FUND | Return After Taxes on Distributions | Class N Shares

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

(2.69%)

5 Years

rr_AverageAnnualReturnYear05

11.51%

10 Years

rr_AverageAnnualReturnYear10

7.00%

Since Inception

rr_AverageAnnualReturnSinceInception

9.59%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2000

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

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

2.52%

5 Years

rr_AverageAnnualReturnYear05

10.89%

10 Years

rr_AverageAnnualReturnYear10

6.67%

Since Inception

rr_AverageAnnualReturnSinceInception

9.03%

Inception Date

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Nov. 30, 2000

ASTON/TAMRO SMALL CAP FUND | Russell 2000 Index (Reflects no deduction for taxes, expenses or fees. Index return for Class I shares, since inception, computed from December 31, 2004, is 7.77%.) | Class N Shares

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

4.89%

5 Years

rr_AverageAnnualReturnYear05

15.55%

10 Years

rr_AverageAnnualReturnYear10

7.77%

Since Inception

rr_AverageAnnualReturnSinceInception

8.75%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2000

ASTON/TAMRO SMALL CAP FUND | Russell 2000 Index (Reflects no deduction for taxes, expenses or fees. Index return for Class I shares, since inception, computed from December 31, 2004, is 7.77%.) | Class I Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.89%

5 Years

rr_AverageAnnualReturnYear05

15.55%

10 Years

rr_AverageAnnualReturnYear10

7.77%

Since Inception

rr_AverageAnnualReturnSinceInception

7.77%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 31, 2004