Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

EAGLE SERIES TRUST

Prospectus Date

rr_ProspectusDate

Mar. 01, 2015

Eagle Smaller Company Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY OF SMALLER COMPANY FUND | 3.1.2015

Objective [Heading]

rr_ObjectiveHeading

Investment objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Eagle Smaller Company Fund (“Smaller Company Fund” or the “fund”) seeks capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and expenses of the fund

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 Smaller Company Fund. You may qualify for sales discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the Class A shares of the Eagle Family of Funds. More information about these and other discounts is available from your financial professional, on page 35 of the fund’s Prospectus and on page 27 of the fund’s Statement of Additional Information.

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 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]

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 68% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

68.00%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

If you purchased $1,000,000 or more of Class A shares of an Eagle mutual fund that were not otherwise eligible for a sales charge waiver and sell the shares within 18 months from the date of purchase, you may pay up to a 1% contingent deferred sales charge at the time of sale.

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the Class A shares of the Eagle Family of Funds. More information about these and other discounts is available from your financial professional, on page 35 of the fund’s Prospectus and on page 27 of the fund’s Statement of Additional Information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

25,000

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, except that the example reflects the fee waiver/expense reimbursement arrangement for each share class. 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 Smaller Company 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 smaller 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 $10.6 billion during the 12-month period ended December 31, 2014).

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:

• Equity securities are subject to stock market risk. In addition, common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company;

• Growth stock risk is the risk of a lack of earnings increase or lack of dividend yield;

• Market timing risk arises because certain types of securities in which the fund invests, including small-cap securities, could cause the fund to be at greater risk of market timing activities by fund shareholders;

• Mid-cap company risk arises because mid-cap companies may have narrower commercial markets, limited managerial and financial resources, and more volatile performance, compared to larger, more established companies;

• 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-cap company risk arises because small-cap companies may have less liquid stock, a more volatile share price, a limited product or service base, narrower commercial markets and limited access to capital, compared to larger, more established companies;

• Stock market risk is the risk of broad stock market decline or volatility or a decline in particular holdings in response to adverse issuer, political, regulatory, market, economic or other developments, public perceptions concerning these developments, and adverse investor sentiment; and

• Value stock risk arises from the possibility that a stock’s intrinsic value may not be fully realized by the market.

Risk Lose Money [Text]

rr_RiskLoseMoney

The greatest risk of investing in this fund is that you could lose money.

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.

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

During performance period	Return	Quarter Ended
(Class A shares):
Best Quarter	25.26%	June 30, 2009
Worst Quarter	(19.93)%	September 30, 2011

Performance Table Heading

rr_PerformanceTableHeading

Average annual total returns
(for the periods ended December 31, 2014):

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

After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) plan or individual retirement account (“IRA”).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown for Class A only and after-tax returns for Class C, Class I, Class R-3, Class R-5, and Class R-6 will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

The return after taxes on distributions and sale of fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of fund shares at the end of the measurement period.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

To obtain more current performance data as of the most recent month-end, please visit our website at eagleasset.com.

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 a 401(k) plan or individual retirement account (“IRA”). After-tax returns are shown for Class A only and after-tax returns for Class C, Class I, Class R-3, Class R-5, and Class R-6 will vary. The return after taxes on distributions and sale of fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of fund shares at the end of the measurement period.

Eagle Smaller Company Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge Imposed on Purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (as a % of original purchase price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Redemption Fee

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.51%

Acquired Fund Fees

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.38%

^[2]

Fee Waiver and/or Expense Reimbursement

est_FeeWaiverAndorExpenseReimbursement

0.02%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.40%

Year 1

rr_ExpenseExampleYear01

611

Year 3

rr_ExpenseExampleYear03

893

Year 5

rr_ExpenseExampleYear05

1,196

Year 10

rr_ExpenseExampleYear10

2,055

2009

rr_AnnualReturn2009

32.44%

2010

rr_AnnualReturn2010

23.16%

2011

rr_AnnualReturn2011

(1.12%)

2012

rr_AnnualReturn2012

15.03%

2013

rr_AnnualReturn2013

36.63%

Annual Return 2014

rr_AnnualReturn2014

(0.39%)

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

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.93%)

1-yr

rr_AverageAnnualReturnYear01

(5.13%)

5-yr

rr_AverageAnnualReturnYear05

12.67%

Lifetime

rr_AverageAnnualReturnSinceInception

14.63%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2008

Eagle Smaller Company Fund | Class C

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

1.00%

Redemption Fee

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.49%

Acquired Fund Fees

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.11%

^[2]

Fee Waiver and/or Expense Reimbursement

est_FeeWaiverAndorExpenseReimbursement

0.02%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

2.13%

Year 1

rr_ExpenseExampleYear01

316

Year 3

rr_ExpenseExampleYear03

663

Year 5

rr_ExpenseExampleYear05

1,136

Year 10

rr_ExpenseExampleYear10

2,443

1-yr

rr_AverageAnnualReturnYear01

(1.06%)

5-yr

rr_AverageAnnualReturnYear05

12.90%

Lifetime

rr_AverageAnnualReturnSinceInception

14.64%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2008

Eagle Smaller Company Fund | Class I

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

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.50%

Acquired Fund Fees

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.12%

^[2]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.97%

Year 1

rr_ExpenseExampleYear01

99

Year 3

rr_ExpenseExampleYear03

341

Year 5

rr_ExpenseExampleYear05

602

Year 10

rr_ExpenseExampleYear10

1,350

1-yr

rr_AverageAnnualReturnYear01

0.18%

5-yr

rr_AverageAnnualReturnYear05

14.30%

Lifetime

rr_AverageAnnualReturnSinceInception

25.26%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 09, 2009

Eagle Smaller Company Fund | Class R-3

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

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.67%

Acquired Fund Fees

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.79%

^[2]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.07%)

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.72%

Year 1

rr_ExpenseExampleYear01

175

Year 3

rr_ExpenseExampleYear03

557

Year 5

rr_ExpenseExampleYear05

963

Year 10

rr_ExpenseExampleYear10

2,099

1-yr

rr_AverageAnnualReturnYear01

(0.60%)

5-yr

rr_AverageAnnualReturnYear05

13.47%

Lifetime

rr_AverageAnnualReturnSinceInception

13.18%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 28, 2009

Eagle Smaller Company Fund | Class R-5

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

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.44%

Acquired Fund Fees

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.06%

^[2]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.09%)

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.97%

Year 1

rr_ExpenseExampleYear01

99

Year 3

rr_ExpenseExampleYear03

328

Year 5

rr_ExpenseExampleYear05

576

Year 10

rr_ExpenseExampleYear10

1,286

1-yr

rr_AverageAnnualReturnYear01

0.10%

5-yr

rr_AverageAnnualReturnYear05

14.30%

Lifetime

rr_AverageAnnualReturnSinceInception

14.00%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 28, 2009

Eagle Smaller Company 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

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.34%

Acquired Fund Fees

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.96%

^[2]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.09%)

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.87%

Year 1

rr_ExpenseExampleYear01

89

Year 3

rr_ExpenseExampleYear03

297

Year 5

rr_ExpenseExampleYear05

522

Year 10

rr_ExpenseExampleYear10

1,170

1-yr

rr_AverageAnnualReturnYear01

0.03%

5-yr

rr_AverageAnnualReturnYear05

Lifetime

rr_AverageAnnualReturnSinceInception

15.62%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 15, 2011

Eagle Smaller Company Fund | After Taxes on Distributions | Class A

Risk/Return:

rr_RiskReturnAbstract

1-yr

rr_AverageAnnualReturnYear01

(12.72%)

5-yr

rr_AverageAnnualReturnYear05

9.67%

Lifetime

rr_AverageAnnualReturnSinceInception

11.93%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2008

Eagle Smaller Company Fund | After Taxes on Distributions and Sale of Fund Shares | Class A

Risk/Return:

rr_RiskReturnAbstract

1-yr

rr_AverageAnnualReturnYear01

3.27%

5-yr

rr_AverageAnnualReturnYear05

10.22%

Lifetime

rr_AverageAnnualReturnSinceInception

11.87%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2008

Eagle Smaller Company Fund | Russell 2000®Index (Lifetime period is measured from the inception date of Class A shares) (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1-yr

rr_AverageAnnualReturnYear01

4.89%

5-yr

rr_AverageAnnualReturnYear05

15.55%

Lifetime

rr_AverageAnnualReturnSinceInception

15.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2008

Eagle Smaller Company Fund | Russell 2500™ Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1-yr

rr_AverageAnnualReturnYear01

7.07%

5-yr

rr_AverageAnnualReturnYear05

16.36%

Lifetime

rr_AverageAnnualReturnSinceInception

17.38%

[1] If you purchased $1,000,000 or more of Class A shares of an Eagle mutual fund that were not otherwise eligible for a sales charge waiver and sell the shares within 18 months from the date of purchase, you may pay up to a 1% contingent deferred sales charge at the time of sale.

[2] Eagle Asset Management, Inc. (“Eagle”) has contractually agreed to waive its investment advisory fee and/or reimburse certain expenses of the fund to the extent that annual operating expenses of each class exceed a percentage of that class’ average daily net assets through February 29, 2016 as follows: Class A - 1.50%, Class C - 2.30%, Class I - 0.95%, Class R-3 - 1.70%, Class R-5 - 0.95%, and Class R-6 - 0.85%. This expense limitation excludes interest, taxes, brokerage commissions, costs relating to investments in other investment companies, dividends, and extraordinary expenses, and includes offset expense arrangements with the fund’s custodian. The contractual fee waiver can be changed only with the approval of a majority of the fund’s Board of Trustees. Any reimbursement of fund expenses or reduction in Eagle’s investment advisory 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.