Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

ASTON FUNDS

Prospectus Date

rr_ProspectusDate

Feb. 28, 2015

ASTON/MONTAG & CALDWELL MID CAP GROWTH FUND

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ASTON/Montag & Caldwell Mid Cap Growth Fund

Objective [Heading]

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INVESTMENT OBJECTIVES

Objective, Primary [Text Block]

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The Fund seeks to provide long-term capital appreciation and,

Objective, Secondary [Text Block]

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secondarily, current income, by investing primarily in common stocks and convertible securities.

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]

rr_OperatingExpensesCaption

ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 29, 2016

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

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 32.96%.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

32.96%

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

rr_OtherExpensesNewFundBasedOnEstimates

Other Expenses for Class I Shares are estimated from the current fiscal year due to the limited operating history of the class.

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%, operating expenses remained the same, and expenses were capped for one year in each period.

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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The Fund invests primarily in common stocks, convertible preferred stocks, and convertible bonds. Under normal circumstances, the Fund invests at least 80% of its assets in securities of mid-cap companies. The Fund defines a mid-cap company as one having a market capitalization, at the time of acquisition, within the range of market capitalizations of companies constituting the Russell Midcap Growth Index. The composition, and thus the market capitalization range, of the Russell Midcap Growth Index changes periodically. As of December 31, 2014, the market capitalization range of the Russell Midcap Growth Index was approximately $275 million to $33.5 billion.

The subadviser uses a bottom-up approach to stock selection and seeks high quality, well-established mid-cap companies that:

• Offer a compelling combination of earnings growth and attractive value
• Sell at a discount to intrinsic value
• Exhibit above-median near-term relative earnings strength
• Are leading franchises and have proven management teams, strong finances and attractive long-term secular growth characteristics

The Fund may invest in foreign securities (directly and through depositary receipts).

To manage risk, the subadviser 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.

Growth Style Risk. Growth investing involves buying stocks of companies that the subadviser believes offer above-average growth potential. These stocks may have relatively high valuations, as measured by traditional valuation metrics (e.g., price-to-earnings ratios or price-to-book ratios). Growth stocks may be more volatile than other stocks because they are generally more sensitive to investor perceptions and market moves. 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 growth stocks underperform.

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.

Mid-Cap Company Risk. Investments in mid-cap companies may entail greater risks than investments in larger, more established companies. Mid-cap companies generally have narrower product lines, limited financial resources and a limited trading market for their stocks compared with 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.

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 has varied from year to year over the periods shown. Class N shares and Class I shares are invested in the same portfolio 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 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 One Year or Less [Text]

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Class I shares commenced operations on May 14, 2014, therefore no returns are shown for Class I shares.

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]

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Class N Shares
Calendar Year Total Return

Bar Chart Closing [Text Block]

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Best quarter:	09/09	15.63	%
Worst quarter:	12/08	(31.59	)%

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. After-tax returns for Class I shares will vary.

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. 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. After-tax returns for Class I shares will vary.

ASTON/MONTAG & CALDWELL MID CAP GROWTH FUND | Class N Shares

Risk/Return:

rr_RiskReturnAbstract

Management Fees

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0.85%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

1.06%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.17%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.91%)

^[1]

Total Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.26%

^[1],[2]

1 Year

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128

3 Years

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591

5 Years

rr_ExpenseExampleYear05

1,081

10 Years

rr_ExpenseExampleYear10

2,432

2008

rr_AnnualReturn2008

(45.81%)

2009

rr_AnnualReturn2009

37.71%

2010

rr_AnnualReturn2010

26.96%

2011

rr_AnnualReturn2011

2.78%

2012

rr_AnnualReturn2012

10.34%

2013

rr_AnnualReturn2013

26.89%

2014

rr_AnnualReturn2014

8.23%

Highest Quarterly Return, Label

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Best quarter:

Highest Quarterly Return, Date

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Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.63%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(31.59%)

1 Year

rr_AverageAnnualReturnYear01

8.23%

^[3]

5 Years

rr_AverageAnnualReturnYear05

14.61%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

5.45%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 02, 2007

^[3]

ASTON/MONTAG & CALDWELL MID CAP GROWTH FUND | Class I Shares

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.85%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

1.06%

^[4]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.92%

^[4]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.91%)

^[1]

Total Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.01%

^[1],[2]

1 Year

rr_ExpenseExampleYear01

103

3 Years

rr_ExpenseExampleYear03

515

5 Years

rr_ExpenseExampleYear05

952

10 Years

rr_ExpenseExampleYear10

2,169

ASTON/MONTAG & CALDWELL MID CAP GROWTH FUND | Return After Taxes on Distributions | Class N Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.19%

^[3]

5 Years

rr_AverageAnnualReturnYear05

13.34%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

4.63%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 02, 2007

^[3]

ASTON/MONTAG & CALDWELL MID CAP GROWTH FUND | Return After Taxes on Distributions and Sale of Fund Shares | Class N Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.37%

^[3]

5 Years

rr_AverageAnnualReturnYear05

11.73%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

4.28%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 02, 2007

^[3]

ASTON/MONTAG & CALDWELL MID CAP GROWTH FUND | Russell Midcap Growth Index (Reflects no deduction for taxes, expenses or fees. Index return since inception is computed from October 31, 2007.)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

11.90%

^[3]

5 Years

rr_AverageAnnualReturnYear05

16.94%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

7.75%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2007

^[3]

[1] The investment adviser is contractually obligated to waive management fees and/or reimburse ordinary operating expenses, not including investment-related costs (such as brokerage commissions), interest, taxes, extraordinary expenses and acquired fund fees and expenses, through February 29, 2016, to the extent that operating expenses exceed 1.25% of the Fund’s average daily net assets with respect to Class N Shares and 1.00% of the Fund’s average daily net assets with respect to Class I Shares (the “Operating Expense Limit”). Prior to February 29, 2016, the arrangements may be amended or terminated only by a vote of the Board of Trustees of Aston Funds. For a period of up to three years from the end of the fiscal year during which fees are waived or expenses are reimbursed, the investment adviser is entitled to be reimbursed by the Fund for such fees waived and expenses reimbursed from the commencement of operations through the completion of the first three full fiscal years to the extent that the Fund’s Total Annual Operating Expenses, not including investment-related costs (such as brokerage commissions), interest, taxes, extraordinary expenses and acquired fund fees and expenses, remain at or below the Operating Expense Limit after such reimbursement.

[2] After Fee Waiver and/or Reimbursement

[3] Class I shares commenced operations on May 14, 2014, therefore no returns are shown for Class I shares.

[4] Other Expenses for Class I Shares are estimated from the current fiscal year due to the limited operating history of the class.