Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED EQUITY FUNDS
Prospectus Date	rr_ProspectusDate	Dec. 31, 2015
Federated MDT Mid-Cap Growth Strategies Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Federated MDT Mid Cap Growth Strategies Fund (the “Fund”)
Objective [Heading]	rr_ObjectiveHeading	RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund's investment objective is appreciation of capital.
Expense [Heading]	rr_ExpenseHeading	RISK/RETURN SUMMARY: FEES AND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold the Fund's Class A Shares (A), Class B Shares (B), Class C Shares (C), Class R Shares (R) and Institutional Shares (IS). You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds. More information about these and other discounts is available from your financial professional and in the “What Do Shares Cost?” section of the Prospectus on page 7.
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	January 1, 2017
Fee Waiver Or Reimbursement Over Assets Later Of Termination Or Next Effective Prospectus	fef_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	up to but not including the later of (the “Termination Date”): (a) January 1, 2017; or (b) the date of the Fund's next effective Prospectus.
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 122% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	122.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
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 assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE What are the Fund's Main Investment Strategies?
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund pursues its investment objective by investing primarily in domestic, mid-cap common stocks that offer superior growth prospects. The Fund's investment adviser (“Adviser”) utilizes a mid-cap growth approach by selecting most investments from companies listed in the Russell Midcap Growth Index, an index that measures the performance of those companies with higher price-to-book ratios and higher forecasted growth values within the mid-cap segment of the U.S. equity universe. The Fund considers mid-cap companies to be those of a size similar to companies listed in the Russell Midcap Growth Index. As of October 31, 2015, the market capitalization of companies in the Russell Midcap Growth Index ranged from $908 million to $30.9 billion. The Adviser implements its strategy using a quantitative computer model driven by fundamental measures, risk controls and expected trading costs. This process, called the Optimum Q process, seeks to impose strict discipline over stock selection, unimpeded by market or manager psychology. It seeks to maximize return while controlling risk. The Optimum Q process also takes into account trading costs in an effort to ensure that trades are generated only to the extent they are expected to be profitable on an after trading-cost basis. Additionally, risk is controlled through diversification constraints which limit exposure to individual companies as well as groups of correlated companies relative to the Fund's investment universe. The Fund will invest its assets so that at least 80% of its net assets (plus any borrowing for investment purposes) are invested in mid-cap investments. The Fund will notify shareholders at least 60 days in advance of any change in its investment policy that would permit the Fund to invest, under normal circumstances, less than 80% of its net assets (plus any borrowings for investment purposes) in investments in mid-cap companies.
Risk [Heading]	rr_RiskHeading	What are the Main Risks of Investing in the Fund?
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include: Stock Market Risk. The value of equity securities in the Fund's portfolio will fluctuate and, as a result, the Fund's Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company's financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company's shares in the market. Risk Related to Investing for Growth. Due to their relatively high valuations, growth stocks are typically more volatile than value stocks. Additionally, growth stocks may not pay dividends or may pay lower dividends than value stocks. Mid -Cap Company Risk. The Fund may invest in mid-capitalization (or “mid-cap”) companies. Mid-cap companies often have narrower markets, limited managerial and financial resources, more volatile performance and greater risk of failure, compared to larger, more established companies. These factors could increase the volatility of the Fund's portfolio, performance and Share price. Sector Risk. Because the Fund may allocate relatively more assets to certain industry sectors than others, the Fund's performance may be more susceptible to any developments which affect those sectors emphasized by the Fund. Quantitative Modeling Risk. The Fund employs quantitative models as a management technique. These models examine multiple economic factors using various proprietary and third-party data.  The results generated by quantitative analysis may perform differently than expected and may negatively affect Fund performance for various reasons (for example, human judgment, data imprecision, software or other technology malfunctions, or programming inaccuracies). The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance: Bar Chart and Table Risk/Return Bar Chart
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the “Products” section at FederatedInvestors.com or by calling 1-800-341-7400.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-341-7400
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	FederatedInvestors.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	Federated MDT Mid Cap Growth Strategies Fund - A Class
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower. Within the periods shown in the bar chart, the Fund's A class highest quarterly return was 16.60% (quarter ended June 30, 2009). Its lowest quarterly return was (25.15)% (quarter ended December 31, 2008).
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Return Table
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-taxes returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	After-tax returns are not relevant to investors holding Shares through a 401(k) plan, an Individual Retirement Account or other tax-advantaged investment plans.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown only for A class and after-tax returns for B class, C class, R class and IS class will differ from those shown for A class.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The Fund's R class and IS class commenced operations on December 12, 2006 and January 29, 2010, respectively. For the period prior to commencement of operations of the R class, the performance information shown is for the Fund's A class, adjusted to reflect the expenses of the R class. For the period prior to the commencement of operations of the IS class, the performance information shown is for the Fund's A class. The performance of the A class has not been adjusted to reflect the expenses of the IS class since the IS class has a lower expense ratio than the expense ratio of the A class. The performance of the A class has been adjusted to remove any voluntary waiver of Fund expenses that may have occurred during the period prior to the commencement of operations of the IS class. Additionally, for both the R class and IS class, the performance information shown below has been adjusted to reflect the absence of sales charges applicable to A class. In addition to Return Before Taxes, Return After Taxes is shown for the Fund's A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class and after-tax returns for B class, C class, R class and IS class will differ from those shown for A class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-taxes returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through a 401(k) plan, an Individual Retirement Account or other tax-advantaged investment plans. (For the Period Ended December 31, 2014)
Federated MDT Mid-Cap Growth Strategies Fund | A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.50%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.54%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.30%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.23%
1 Year	rr_ExpenseExampleYear01	$ 675
3 Years	rr_ExpenseExampleYear03	939
5 Years	rr_ExpenseExampleYear05	1,224
10 Years	rr_ExpenseExampleYear10	2,032
1 Year	rr_ExpenseExampleNoRedemptionYear01	675
3 Years	rr_ExpenseExampleNoRedemptionYear03	939
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,224
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,032
2005	rr_AnnualReturn2005	12.82%
2006	rr_AnnualReturn2006	8.70%
2007	rr_AnnualReturn2007	18.04%
2008	rr_AnnualReturn2008	(42.75%)
2009	rr_AnnualReturn2009	30.87%
2010	rr_AnnualReturn2010	18.89%
2011	rr_AnnualReturn2011	(3.59%)
2012	rr_AnnualReturn2012	6.69%
2013	rr_AnnualReturn2013	40.14%
2014	rr_AnnualReturn2014	13.65%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	16.60%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(25.15%)
1 Year	rr_AverageAnnualReturnYear01	7.40%
5 Years	rr_AverageAnnualReturnYear05	12.97%
10 Years	rr_AverageAnnualReturnYear10	7.16%
Federated MDT Mid-Cap Growth Strategies Fund | B
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	5.50%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.61%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.12%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.98%
1 Year	rr_ExpenseExampleYear01	$ 765
3 Years	rr_ExpenseExampleYear03	1,064
5 Years	rr_ExpenseExampleYear05	1,339
10 Years	rr_ExpenseExampleYear10	2,243
1 Year	rr_ExpenseExampleNoRedemptionYear01	215
3 Years	rr_ExpenseExampleNoRedemptionYear03	664
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,139
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,243
1 Year	rr_AverageAnnualReturnYear01	7.59%
5 Years	rr_AverageAnnualReturnYear05	13.15%
10 Years	rr_AverageAnnualReturnYear10	7.11%
Federated MDT Mid-Cap Growth Strategies Fund | C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.56%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.07%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.09%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.98%
1 Year	rr_ExpenseExampleYear01	$ 310
3 Years	rr_ExpenseExampleYear03	649
5 Years	rr_ExpenseExampleYear05	1,114
10 Years	rr_ExpenseExampleYear10	2,400
1 Year	rr_ExpenseExampleNoRedemptionYear01	210
3 Years	rr_ExpenseExampleNoRedemptionYear03	649
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,114
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,400
1 Year	rr_AverageAnnualReturnYear01	11.86%
5 Years	rr_AverageAnnualReturnYear05	13.41%
10 Years	rr_AverageAnnualReturnYear10	6.95%
Federated MDT Mid-Cap Growth Strategies Fund | R
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other Expenses	rr_OtherExpensesOverAssets	0.47%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.73%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.73%
1 Year	rr_ExpenseExampleYear01	$ 176
3 Years	rr_ExpenseExampleYear03	545
5 Years	rr_ExpenseExampleYear05	939
10 Years	rr_ExpenseExampleYear10	2,041
1 Year	rr_ExpenseExampleNoRedemptionYear01	176
3 Years	rr_ExpenseExampleNoRedemptionYear03	545
5 Years	rr_ExpenseExampleNoRedemptionYear05	939
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,041
1 Year	rr_AverageAnnualReturnYear01	13.06%
5 Years	rr_AverageAnnualReturnYear05	13.70%
10 Years	rr_AverageAnnualReturnYear10	7.27%
Federated MDT Mid-Cap Growth Strategies Fund | IS
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.27%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.03%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.05%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.98%
1 Year	rr_ExpenseExampleYear01	$ 105
3 Years	rr_ExpenseExampleYear03	328
5 Years	rr_ExpenseExampleYear05	569
10 Years	rr_ExpenseExampleYear10	1,259
1 Year	rr_ExpenseExampleNoRedemptionYear01	105
3 Years	rr_ExpenseExampleNoRedemptionYear03	328
5 Years	rr_ExpenseExampleNoRedemptionYear05	569
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,259
1 Year	rr_AverageAnnualReturnYear01	13.93%
5 Years	rr_AverageAnnualReturnYear05	14.54%
10 Years	rr_AverageAnnualReturnYear10	7.85%
Federated MDT Mid-Cap Growth Strategies Fund | Return After Taxes on Distributions | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.72%
5 Years	rr_AverageAnnualReturnYear05	11.23%
10 Years	rr_AverageAnnualReturnYear10	6.16%
Federated MDT Mid-Cap Growth Strategies Fund | Return After Taxes on Distributions and Sale of Fund Shares | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.76%
5 Years	rr_AverageAnnualReturnYear05	9.94%
10 Years	rr_AverageAnnualReturnYear10	5.62%
Federated MDT Mid-Cap Growth Strategies Fund | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	11.90%	[2]
5 Years	rr_AverageAnnualReturnYear05	16.94%	[2]
10 Years	rr_AverageAnnualReturnYear10	9.43%	[2]
Federated MDT Mid-Cap Growth Strategies Fund | Morningstar Mid Cap Growth Funds Average
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.00%	[3]
5 Years	rr_AverageAnnualReturnYear05	14.76%	[3]
10 Years	rr_AverageAnnualReturnYear10	8.29%	[3]

[1] The Adviser and certain of its affiliates on their own initiative have agreed to waive certain amounts of their respective fees and/or reimburse expenses. The total annual fund operating expenses (excluding Acquired Fund Fees and Expenses, extraordinary expenses, expenses allocated from affiliated partnerships and proxy-related expenses paid by the Fund, if any) paid by the Fund's A, B, C, R and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.22%, 1.97%, 1.97%, 1.72% and 0.97% (the "Fee Limit"), respectively, up to but not including the later of (the "Termination Date"): (a) January 1, 2017; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Fund's Board of Trustees.

[2] The Russell Midcap® Growth Index measures the performance of the mid-cap growth segment of the U.S. equity universe. It includes those Russell Midcap® Index companies with higher price-to-book ratios and higher forecasted growth values. The Russell Midcap® Growth Index is constructed to provide a comprehensive and unbiased barometer of the mid-cap growth market and is completely reconstituted annually to ensure larger stocks do not distort the performance and characteristics of the true mid-cap growth market. The Russell Midcap® Growth Index is not adjusted to reflect sales loads, expenses or other fees that the Securities and Exchange Commission (SEC) requires to be reflected in the Fund’s performance. The index is unmanaged and unlike the Fund, is not affected by cash flows. It is not possible to invest directly in an index.

[3] Morningstar figures represent the average of the total returns reported by all the mutual funds designated by Morningstar as falling into the respective category indicated. They do not reflect sales charges.