Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

ASTON FUNDS

Prospectus Date

rr_ProspectusDate

Feb. 28, 2015

ASTON/FAIRPOINTE MID CAP FUND

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ASTON/Fairpointe Mid Cap Fund

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks long-term total return through capital appreciation by investing primarily in common and preferred stocks and convertible securities.

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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]

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 Fund’s portfolio turnover rate was 50.25%.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

50.25%

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 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]

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal conditions, the Fund invests at least 80% of its assets in stocks of mid-cap companies with an improving revenue and earnings growth outlook. The Fund defines a mid-cap company as one having a market capitalization of between $1 and $15 billion at the time of acquisition. The subadviser selects stocks based on bottom-up fundamental analysis.

Important investment criteria include:

• Focused business franchise with ability to grow market share
• Attractive valuation
• Low relative leverage
• Experienced management

The subadviser takes a long-term approach with a focus on maximizing after-tax returns.

The Fund may invest in small-cap stocks, convertible preferred stocks, and foreign securities (directly and through depositary receipts). The Fund may purchase put options on securities held in the Fund’s portfolio.

To manage risk, the subadviser employs a valuation discipline to limit downside risk, limits position sizes and sector exposure, and adheres to a structured sell discipline.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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.

Derivatives Risk. Risks associated with derivatives may include the risk that the derivative is imperfectly correlated with the security, index or currency to which it relates, the risk that derivatives may not have the intended effects and may result in losses or missed opportunities and the risk that the Fund will be unable to sell or otherwise close out the derivative. Derivative transactions could also expose the Fund to the effects of leverage, which could increase the Fund’s exposure to the market and magnify potential losses. There is no guarantee that derivatives, to the extent employed, will have the intended effect, and their use could cause lower returns or even losses to the Fund. The use of derivatives by the Fund to hedge risk may reduce the opportunity for gain by offsetting the positive effect of favorable price movements. The use of over-the-counter derivatives subjects the Fund to the risk that the counterparty to the derivative may be unwilling or unable to meet its obligations on the investment. The use of certain derivatives may expose the Fund to the underlying market or other reference asset in an amount exceeding the cash investment of the Fund.

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.

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]

rr_RiskLoseMoney

You could lose money by investing in the Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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]

rr_PerformanceAvailabilityPhone

800-992-8151

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.astonfunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Class N Shares
Calendar Year Total Return

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best quarter:	09/09	28.31	%
Worst quarter:	12/08	(29.83	)%

Performance Table Heading

rr_PerformanceTableHeading

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

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

rr_PerformanceTableNotRelevantToTaxDeferred

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]

rr_PerformanceTableOneClassOfAfterTaxShown

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

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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]

rr_PerformanceTableClosingTextBlock

Fairpointe Capital LLC (“Fairpointe”) became the subadviser to the Fund on April 30, 2011. Performance prior to that date reflects the performance of previous subadvisers. However, Ms. Zerhusen has served as a portfolio manager since May 1999.

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. 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/FAIRPOINTE MID CAP FUND | Class N Shares

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.15%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.11%

1 Year

rr_ExpenseExampleYear01

113

3 Years

rr_ExpenseExampleYear03

353

5 Years

rr_ExpenseExampleYear05

612

10 Years

rr_ExpenseExampleYear10

1,352

2005

rr_AnnualReturn2005

1.32%

2006

rr_AnnualReturn2006

20.92%

2007

rr_AnnualReturn2007

12.91%

2008

rr_AnnualReturn2008

(42.86%)

2009

rr_AnnualReturn2009

66.18%

2010

rr_AnnualReturn2010

23.02%

2011

rr_AnnualReturn2011

(6.55%)

2012

rr_AnnualReturn2012

16.44%

2013

rr_AnnualReturn2013

44.49%

2014

rr_AnnualReturn2014

9.73%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

28.31%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(29.83%)

1 Year

rr_AverageAnnualReturnYear01

9.73%

5 Years

rr_AverageAnnualReturnYear05

16.24%

10 Years

rr_AverageAnnualReturnYear10

10.80%

Since Inception

rr_AverageAnnualReturnSinceInception

13.20%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 19, 1994

ASTON/FAIRPOINTE MID CAP FUND | Class I Shares

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.15%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.86%

1 Year

rr_ExpenseExampleYear01

88

3 Years

rr_ExpenseExampleYear03

274

5 Years

rr_ExpenseExampleYear05

477

10 Years

rr_ExpenseExampleYear10

1,061

1 Year

rr_AverageAnnualReturnYear01

10.03%

5 Years

rr_AverageAnnualReturnYear05

16.54%

10 Years

rr_AverageAnnualReturnYear10

11.08%

Since Inception

rr_AverageAnnualReturnSinceInception

11.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 06, 2004

ASTON/FAIRPOINTE MID CAP FUND | Return After Taxes on Distributions | Class N Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.30%

5 Years

rr_AverageAnnualReturnYear05

14.65%

10 Years

rr_AverageAnnualReturnYear10

9.70%

Since Inception

rr_AverageAnnualReturnSinceInception

11.79%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 19, 1994

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

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

8.58%

5 Years

rr_AverageAnnualReturnYear05

13.06%

10 Years

rr_AverageAnnualReturnYear10

8.85%

Since Inception

rr_AverageAnnualReturnSinceInception

11.07%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 19, 1994

ASTON/FAIRPOINTE MID CAP FUND | S&P MidCap 400 Index (Reflects no deduction for taxes, expenses or fees. Index return since inception for Class N shares is computed from September 30, 1994. Index return for Class I shares, since inception, computed from June 30, 2004, is 10.20%.) | Class N Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.77%

5 Years

rr_AverageAnnualReturnYear05

16.54%

10 Years

rr_AverageAnnualReturnYear10

9.71%

Since Inception

rr_AverageAnnualReturnSinceInception

12.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 1994

ASTON/FAIRPOINTE MID CAP FUND | S&P MidCap 400 Index (Reflects no deduction for taxes, expenses or fees. Index return since inception for Class N shares is computed from September 30, 1994. Index return for Class I shares, since inception, computed from June 30, 2004, is 10.20%.) | Class I Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.77%

5 Years

rr_AverageAnnualReturnYear05

16.54%

10 Years

rr_AverageAnnualReturnYear10

9.71%

Since Inception

rr_AverageAnnualReturnSinceInception

10.20%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2004