Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

EAGLE SERIES TRUST

Prospectus Date

rr_ProspectusDate

Mar. 01, 2015

Eagle Mid Cap Growth Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY OF MID CAP GROWTH FUND |  3.1.2015

Objective [Heading]

rr_ObjectiveHeading

Investment objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Eagle Mid Cap Growth Fund (“Mid Cap Growth Fund” or the “fund”) seeks long-term capital appreciation.

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 Mid Cap Growth 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):

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 60% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

60.00%

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. 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 Mid Cap Growth 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 mid-capitalization companies. The fund’s portfolio managers consider mid-capitalization companies to be those companies that, at the time of initial purchase, have market capitalizations that fall within the range of companies included in the Russell Midcap® Growth Index during the most recent 12-month period. The Russell Midcap® Growth Index ranged from approximately $275 million to $38 billion during the 12-month period ended December 31, 2014.

The fund will invest primarily in the equity securities of companies that the portfolio managers believe have the potential for above-average earnings or sales growth, reasonable valuations and acceptable debt levels. Such stocks can typically have high price-to-earnings ratios. Equity securities include common and preferred stock, warrants or rights exercisable into common or preferred stock and high-quality convertible securities. The portfolio managers generally do not emphasize investment in any particular investment sector or industry. The fund will generally sell when the stock has met the portfolio managers’ target price, the investment is no longer valid, a better investment opportunity has arisen or if the investment reaches a value more than 5% of the fund’s net assets.

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. Preferred stocks and convertible securities are sensitive to movements in interest rates. Convertible securities also are subject to the risk that the credit standing of the issuer may have an effect on the convertible securities’ investment value. Rights and warrants do not carry dividend or voting rights with respect to the underlying securities or any rights in the assets of the issuer, and a right or a warrant ceases to have value if it is not exercised prior to its expiration date;

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

• 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;

• Sector risk is the risk associated with the fund holding a core portfolio of stocks invested in similar businesses, all of which could be affected by the same economic or market conditions;

• 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; and

• 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.

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 10 year period	Return	Quarter Ended
(Class A shares):
Best Quarter	18.31%	December 31, 2010
Worst Quarter	(25.72)%	December 31, 2008

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 equal or 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 equal or 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 Mid Cap Growth 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

0.59%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.35%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.19%

Year 1

rr_ExpenseExampleYear01

591

Year 3

rr_ExpenseExampleYear03

835

Year 5

rr_ExpenseExampleYear05

1,098

Year 10

rr_ExpenseExampleYear10

1,850

2005

rr_AnnualReturn2005

7.05%

2006

rr_AnnualReturn2006

8.29%

2007

rr_AnnualReturn2007

25.55%

2008

rr_AnnualReturn2008

(38.91%)

2009

rr_AnnualReturn2009

39.80%

2010

rr_AnnualReturn2010

29.97%

2011

rr_AnnualReturn2011

(8.92%)

2012

rr_AnnualReturn2012

15.89%

2013

rr_AnnualReturn2013

37.54%

2014

rr_AnnualReturn2014

9.64%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2010

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.31%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.72%)

1-yr

rr_AverageAnnualReturnYear01

4.43%

5-yr

rr_AverageAnnualReturnYear05

14.53%

10-yr

rr_AverageAnnualReturnYear10

9.37%

Lifetime

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 20, 1998

Eagle Mid Cap Growth 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

0.59%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.30%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.89%

Year 1

rr_ExpenseExampleYear01

292

Year 3

rr_ExpenseExampleYear03

594

Year 5

rr_ExpenseExampleYear05

1,021

Year 10

rr_ExpenseExampleYear10

2,212

1-yr

rr_AverageAnnualReturnYear01

8.86%

5-yr

rr_AverageAnnualReturnYear05

14.84%

10-yr

rr_AverageAnnualReturnYear10

9.11%

Lifetime

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 20, 1998

Eagle Mid Cap Growth 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

0.59%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.26%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.85%

Year 1

rr_ExpenseExampleYear01

87

Year 3

rr_ExpenseExampleYear03

271

Year 5

rr_ExpenseExampleYear05

471

Year 10

rr_ExpenseExampleYear10

1,049

1-yr

rr_AverageAnnualReturnYear01

10.01%

5-yr

rr_AverageAnnualReturnYear05

16.05%

10-yr

rr_AverageAnnualReturnYear10

Lifetime

rr_AverageAnnualReturnSinceInception

11.42%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 21, 2006

Eagle Mid Cap Growth 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

0.59%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.39%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.48%

Year 1

rr_ExpenseExampleYear01

151

Year 3

rr_ExpenseExampleYear03

468

Year 5

rr_ExpenseExampleYear05

808

Year 10

rr_ExpenseExampleYear10

1,768

1-yr

rr_AverageAnnualReturnYear01

9.30%

5-yr

rr_AverageAnnualReturnYear05

15.34%

10-yr

rr_AverageAnnualReturnYear10

Lifetime

rr_AverageAnnualReturnSinceInception

19.58%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 12, 2009

Eagle Mid Cap Growth 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

0.59%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.28%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.87%

Year 1

rr_ExpenseExampleYear01

89

Year 3

rr_ExpenseExampleYear03

278

Year 5

rr_ExpenseExampleYear05

482

Year 10

rr_ExpenseExampleYear10

1,073

1-yr

rr_AverageAnnualReturnYear01

9.97%

5-yr

rr_AverageAnnualReturnYear05

16.03%

10-yr

rr_AverageAnnualReturnYear10

Lifetime

rr_AverageAnnualReturnSinceInception

15.76%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 28, 2009

Eagle Mid Cap Growth 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

0.59%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.18%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.77%

Year 1

rr_ExpenseExampleYear01

79

Year 3

rr_ExpenseExampleYear03

246

Year 5

rr_ExpenseExampleYear05

428

Year 10

rr_ExpenseExampleYear10

954

1-yr

rr_AverageAnnualReturnYear01

10.11%

5-yr

rr_AverageAnnualReturnYear05

10-yr

rr_AverageAnnualReturnYear10

Lifetime

rr_AverageAnnualReturnSinceInception

17.82%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 15, 2011

Eagle Mid Cap Growth Fund | After Taxes on Distributions | Class A

Risk/Return:

rr_RiskReturnAbstract

1-yr

rr_AverageAnnualReturnYear01

2.12%

5-yr

rr_AverageAnnualReturnYear05

13.65%

10-yr

rr_AverageAnnualReturnYear10

8.27%

Lifetime

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 20, 1998

Eagle Mid Cap Growth Fund | After Taxes on Distributions and Sale of Fund Shares | Class A

Risk/Return:

rr_RiskReturnAbstract

1-yr

rr_AverageAnnualReturnYear01

4.43%

5-yr

rr_AverageAnnualReturnYear05

11.70%

10-yr

rr_AverageAnnualReturnYear10

7.49%

Lifetime

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 20, 1998

Eagle Mid Cap Growth Fund | Russell Midcap® Growth Index (Lifetime period is measured from the inception date of Class I shares) (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1-yr

rr_AverageAnnualReturnYear01

11.90%

5-yr

rr_AverageAnnualReturnYear05

16.94%

10-yr

rr_AverageAnnualReturnYear10

9.43%

Lifetime

rr_AverageAnnualReturnSinceInception

9.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 21, 2006

[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.