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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName EAGLE SERIES TRUST
Prospectus Date rr_ProspectusDate Aug. 15, 2011
Eagle Small Cap Core Value Fund | Class R-6
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a % of original purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a % of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.26%
Shareholder Service Fees rr_Component1OtherExpensesOverAssets none
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 1.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.04% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.90%
Operating Expenses Fee Waivers and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (1.01%) [2]
Net Expenses rr_NetExpensesOverAssets 0.89%
Year 1 rr_ExpenseExampleYear01 91
Year 3 rr_ExpenseExampleYear03 499
Year 5 rr_ExpenseExampleYear05 932
Year 10 rr_ExpenseExampleYear10 2,140
Eagle Small Cap Core Value Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Annual Return 2009 rr_AnnualReturn2009 32.44%
Annual Return 2010 rr_AnnualReturn2010 23.16%
Year to Date Return, Label rr_YearToDateReturnLabel Year to date total return (Class A shares) as of June 30, 2011
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 9.73%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.26%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.05%)
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2008
1-yr rr_AverageAnnualReturnYear01 17.31%
Lifetime rr_AverageAnnualReturnSinceInception 20.56%
Eagle Small Cap Core Value Fund | Class A | Return After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2008
1-yr rr_AverageAnnualReturnYear01 15.59%
Lifetime rr_AverageAnnualReturnSinceInception 19.11%
Eagle Small Cap Core Value Fund | Class A | Return After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 03, 2008
1-yr rr_AverageAnnualReturnYear01 12.86%
Lifetime rr_AverageAnnualReturnSinceInception 17.18%
Eagle Small Cap Core Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Eagle Mutual Funds

SUMMARY OF SMALL CAP CORE VALUE FUND    |    8.15.2011
Objective [Heading] rr_ObjectiveHeading
Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Eagle Small Cap Core Value Fund ("Small Cap Core Value Fund" or the "fund") seeks capital growth.
Expense [Heading] rr_ExpenseHeading
Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The tables that follow describe the fees and expenses that you may pay if you buy and hold shares of the Small Cap Core Value Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption
Shareholder fees
(fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual fund operating expenses

(expenses deducted from fund assets):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 15, 2012
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 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expense Example [Heading] rr_ExpenseExampleHeading
Expense 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 assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your 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] rr_StrategyHeading
Principal investment strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
During normal market conditions, the Small Cap Core Value Fund seeks to achieve its objective by investing at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in the equity securities of small-capitalization companies. The fund's portfolio managers consider small-capitalization companies to be those companies that, at the time of initial purchase, have a market capitalization equal to or less than the largest company in the Russell 2000® Index during the most recent 12-month period (approximately $6 billion during the 12-month period ended June 30, 2011).
 
The fund's portfolio managers use a core value approach to select the fund's investments. Using this investment style, the portfolio managers seek securities selling at discounts to their underlying values and then hold these securities until the market values reflect their intrinsic values. Factors that the portfolio managers look for in selecting investments include: (1) favorable expected returns relative to perceived risk; (2) management with demonstrated ability and commitment to the company; (3) above average potential for earnings and revenue growth; (4) low market valuations relative to forecasted earnings, book value, cash flow and sales; (5) turnaround potential for companies that have been through difficult periods; (6) low debt levels relative to total capitalization; and (7) strong industry fundamentals, such as increasing or sustainable demand and barriers to entry. The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.
Risk [Heading] rr_RiskHeading
Principal risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The greatest risk of investing in this fund is that you could lose money. The fund invests primarily in common stocks whose values increase and decrease in response to the activities of the companies that issued such stocks, general market conditions and/or economic conditions. As a result, the fund's net asset value ("NAV") also increases and decreases. Investments in this fund are subject to the following primary risks and these risks are further explained in "Additional Information About Risk Factors":
 
  • Growth stock risk is the risk of a lack of earnings increase or lack of dividend yield;
  • Market timing risk arises because a fund's value may be affected by market timing, especially in small-cap securities;
  • Investing in other investment companies and exchange-traded funds ("ETFs") carries with it the risk that by investing in another investment company or ETF the fund, and therefore its shareholders, indirectly bear the fund's proportionate share of the fees and expenses paid by shareholders of the other investment company or ETF, in addition to the fees and expenses fund shareholders directly bear in connection with the fund's own operations;
  • Small- and mid-cap company risk arises because small- and mid-cap companies may have narrower commercial markets, less liquidity and less financial resources than large-cap companies;
  • Stock market risk is the risk of broad stock market decline or decline in particular holdings; and
  • Value stock risk arises from the possibility that a stock's true value may not be fully realized by the market.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart that follows illustrates annual fund returns for the periods ended December 31. The table that follows compares the fund's returns for various periods with benchmark returns. This information is intended to give you some indication of the risk of investing in the fund by demonstrating how its returns have varied over time. The bar chart shows the fund's Class A share performance from one year to another.  The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. To obtain more current performance data as of the most recent month-end, please visit our website at eagleasset.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns This information is intended to give you some indication of the risk of investing in the fund by demonstrating how its returns have varied over time. The bar chart shows the fund's Class A share performance from one year to another.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress eagleasset.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
The returns in the preceding tables do not reflect sales charges. If the sales charges were reflected, the returns would be lower than those shown.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the preceding tables do not reflect sales charges. If the sales charges were reflected, the returns would be lower than those shown
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
                                                                                     
Returns for Class R-6 shares would have substantially similar annual returns because the shares are invested in the same portfolio of securities and the annual returns would differ only to the extent that Class R-6 shares do not have the same expenses as Class A shares.

 Year to date total return (Class A shares) as of June 30, 2011 was 9.73% (not annualized).

During performance period:
(Class A Shares)
  
Return
  
Quarter ended
Best Quarter
  
25.26%
  
June 30, 2009
Worst Quarter
  
(16.05)%
  
March 31, 2009
                                                                                
Performance Table Heading rr_PerformanceTableHeading
Average annual total returns
(for the periods ended December 31, 2010):
Fund return (after deduction of sales charges and expenses)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historically 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 Actual 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 fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual 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 fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Eagle Small Cap Core Value Fund | Russell 2000 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1-yr rr_AverageAnnualReturnYear01 26.85%
Lifetime rr_AverageAnnualReturnSinceInception 20.75%
Eagle Small Cap Core Value Fund | Russell 2500 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1-yr rr_AverageAnnualReturnYear01 26.71% [3],[4]
Lifetime rr_AverageAnnualReturnSinceInception 24.25% [3],[4]
[1] Acquired Fund Fees and Expenses are fees incurred indirectly by the fund as a result of investment in certain pooled investment vehicles, such as mutual funds.
[2] As the fund's asset levels change, the fund's fees and expenses may differ from those reflected in the preceding table. For example, as asset levels decline, expense ratios may increase. Eagle Asset Management, Inc. ("Eagle") has contractually agreed to cap its management fee and/or reimburse certain expenses of the fund to the extent that annual operating expenses exceed 0.85% of the R-6 class' average daily net assets through August 15, 2012. This expense limitation excludes interest, taxes, brokerage commissions, costs relating to investments in other investment companies, dividends, extraordinary expenses and includes offset expense arrangements with the fund's custodian. The Board of Trustees may agree to change fee limitations or reimbursements without the approval of fund shareholders. Any reimbursement of fund expenses or reduction in Eagle's management fees is subject to reimbursement by the fund within the following two fiscal years, if overall expenses fall below the lesser of its then current expense cap or the expense cap in effect at the time of the fund reimbursement.
[3] Effective January, 1, 2011, the fund added a second performance benchmark index, the Russell 2500® Index.
[4] Lifetime period is measured from the inception date of Class A shares