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Element

Value

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

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What is the Fund's investment objective?

Objective, Primary [Text Block]

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Delaware Select Growth Fund seeks long-term capital appreciation.

Expense [Heading]

rr_ExpenseHeading

What are the Fund's 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. 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 Delaware Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information (SAI) under the section entitled "Purchasing Shares."

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 Delaware Investments® Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

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)

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 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:

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 41% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

Strategy [Heading]

rr_StrategyHeading

What are the Fund's principal investment strategies?

Strategy Narrative [Text Block]

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The Fund invests primarily in common stocks of companies that its portfolio managers believe have long-term capital appreciation potential and are expected to grow faster than the U.S. economy. The portfolio managers will consider companies of any size or market capitalization. Using a bottom-up approach, the portfolio managers seek to select securities that they believe have large end-market potential or dominance of a profitable niche market, dominant business models, and strong free cash flow generation that are attractively priced compared to the intrinsic value of the securities. The portfolio managers also consider a company's operational efficiencies, management's plans for capital allocation, and the company's shareholder orientation. Holdings are generally sold for the following reasons: a better idea is found (that is, the stock is "crowded out" of the portfolio); an unexpected, negative fundamental change, including change in investment strategy; the holding's valuation becomes stretched past fair value; or portfolio construction considerations. The Fund may invest in real estate investment trusts (REITs).

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative [Text Block]

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Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund's portfolio. Principal risks include:

Investments not guaranteed by Delaware Management Company (Manager) or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.

Issuer concentration risk — The portfolio generally holds a limited number of securities depending on our assessment of the investment opportunities available. This allows us to focus on the potential of those particular issuers, but it also means that the Fund may be more volatile than those funds that hold a greater number of securities.

Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.

Liquidity risk — The possibility that securities cannot be readily sold within seven days at approximately the price at which a portfolio has valued them.

Foreign risk — The risk that foreign securities (particularly in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards.

Currency risk — The risk that the value of a portfolio's investments may be negatively affected by changes in foreign currency exchange rates.

Counterparty risk — The risk that a counterparty to a derivatives contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets and significantly affect fund performance.

Real estate industry risk — This risk includes, among others: possible declines in the value of real estate; risks related to general and local economic conditions; possible lack of availability of mortgage funds; overbuilding; extended vacancies of properties; increases in competition, property taxes, and operating expenses; changes in zoning laws; costs resulting from the cleanup of, and liability to third parties resulting from, environmental problems; casualty for condemnation losses; uninsured damages from floods, earthquakes, or other natural disasters; limitations on and variations in rents; and changes in interest rates.

Risk Lose Money [Text]

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Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund's portfolio.

Bar Chart and Performance Table [Heading]

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How has Delaware Select Growth Fund performed?

Performance Narrative [Text Block]

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The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps. You may obtain the Fund's most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawareinvestments.com/performance.

Bar Chart [Heading]

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Year-by-year total return (Class A)

Bar Chart Closing [Text Block]

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During the periods illustrated in this bar chart, Class A's highest quarterly return was 23.21% for the quarter ended June 30, 2009 and its lowest quarterly return was -24.96% for the quarter ended Dec. 31, 2008. The maximum Class A sales charge of 5.75%, which is normally deducted when you purchase shares, is not reflected in the /lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.

Performance Table Heading

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Average annual total returns for periods ended December 31, 2014

Performance Table Closing [Text Block]

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After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor's individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

Performance Table Does Reflect Sales Loads

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The average annual total returns in the table below do include the sales charge.

Performance Table Uses Highest Federal Rate

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The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented 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 are not relevant for shares held in tax-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

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 it will perform in the future.

Performance Table One Class of after Tax Shown [Text]

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After-tax performance is presented only for Class A shares of the Fund.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

delawareinvestments.com/performance

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800 523-1918

Russell 3000® Growth Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

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rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

Class A

Risk/Return:

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Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

Maximum contingent deferred sales charge (load) as apercentage of original purchase price or redemptionprice, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management fees

rr_ManagementFeesOverAssets

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total annual fund operating expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Annual Return 2005

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Annual Return 2006

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Annual Return 2007

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Annual Return 2008

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Annual Return 2009

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Annual Return 2010

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Annual Return 2011

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Annual Return 2012

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Annual Return 2013

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Annual Return 2014

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Highest Quarterly Return, Label

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highest quarterly return was 23.21% for the quarter ended June 30, 2009

Highest Quarterly Return

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Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return was -24.96% for the quarter ended Dec. 31, 2008

Lowest Quarterly Return

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Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

Class A | return after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

Class A | return after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as apercentage of original purchase price or redemptionprice, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

^[1]

Management fees

rr_ManagementFeesOverAssets

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total annual fund operating expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Expense Example, No Redemption, 1 Year

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Expense Example, No Redemption, 3 Years

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Expense Example, No Redemption, 5 Years

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Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

Class R

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as apercentage of original purchase price or redemptionprice, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management fees

rr_ManagementFeesOverAssets

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total annual fund operating expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as apercentage of original purchase price or redemptionprice, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management fees

rr_ManagementFeesOverAssets

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

Total annual fund operating expenses

rr_ExpensesOverAssets

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

[1]	Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).