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Equity Oriented or Fixed Income Oriented Funds | The Emerging Markets Portfolio II  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading

The Emerging Markets Portfolio II
Investment Objective, Heading rr_ObjectiveHeading

What is the Portfolio's investment objective?
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The Emerging Markets Portfolio II seeks long-term capital appreciation.
Expense, Heading rr_ExpenseHeading

What are the Portfolio's fees and expenses?
Expense, Narrative rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio.
Operating Expenses, Caption rr_OperatingExpensesCaption

Annual portfolio 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
Feb. 28, 2017
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading

Portfolio turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the example, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 8.00%
Expense Example, Heading rr_ExpenseExampleHeading

Example
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Portfolio 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 reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investment Strategy, Heading rr_StrategyHeading

What are the Portfolio's principal investment strategies?
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

The Portfolio invests primarily in a broad range of equity securities of companies located in emerging market countries. Emerging market countries include those currently considered to be developing by the World Bank, the United Nations or the countries' governments. These countries typically are located in the Asia-Pacific region, Eastern Europe, the Middle East, Central America, and South America, and Africa. Under normal market conditions, at least 80% of the Portfolio's net assets, plus any borrowings for investment purposes, will be invested in emerging market issuers (80% policy). The Portfolio's 80% policy can be changed without shareholder approval. However, shareholders would be given at least 60 days' notice prior to any such change. The Portfolio may invest in companies of any size and may invest 25% of its assets in the securities of issuers located in the same country.

Although the Portfolio invests primarily in companies from countries considered to be emerging, the Portfolio will also invest in companies that are not in emerging countries: (1) if the portfolio manager believes that the performance of a company or its industry will be influenced by opportunities in the emerging markets; (2) to maintain exposure to industry segments where the portfolio manager believes there are not satisfactory investment opportunities in emerging countries; and (3) if the portfolio manager believes there is the potential for significant benefit to the Portfolio.

The Manager believes that although market price and intrinsic business value are positively correlated in the long run, short-term divergences can emerge. The Portfolio seeks to take advantage of these divergences through a fundamental, bottom-up approach. The Portfolio invests in securities of companies with sustainable franchises when they are trading at a discount to the Manager's intrinsic value estimate for that security.

The Manager defines sustainable franchises as those companies with potential to earn excess returns above their cost of capital over the long run. Sustainability analysis involves identification of a company's source of competitive advantage and the ability of its management to maximize its return potential. The Manager prefers companies with large market opportunities in which to deploy capital, providing opportunities to grow faster than the overall economy.

Intrinsic value assessment is quantitatively determined through a variety of valuation methods including discounted cash flow, replacement cost, private market transaction, and multiples analysis.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration
Under normal market conditions, at least 80% of the Portfolio's net assets, plus any borrowings for investment purposes, will be invested in emerging market issuers (80% policy). The Portfolio's 80% policy can be changed without shareholder approval. However, shareholders would be given at least 60 days' notice prior to any such change.
Risk, Heading rr_RiskHeading

What are the principal risks of investing in the Portfolio?
Risk, Narrative rr_RiskNarrativeTextBlock

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 Portfolio will increase and decrease according to changes in the value of the securities in its portfolio. Principal risks include:


Risk Definition

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.

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.

Foreign government/
supranational securities risk

The risk that a foreign government or government related issuer may be unable to make timely payments on its external debt obligations.

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.

Currency risk

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

Derivatives risk

Derivatives contracts, such as options, futures, and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security or a securities index to which a derivatives contract is associated moves in the opposite direction from what the portfolio manager anticipated. Derivatives contracts are also subject to the risk that the counterparty may fail to perform its obligations under the contract due to financial difficulties (such as a bankruptcy or reorganization).

Interest rate risk

The risk that securities will decrease in value if interest rates rise. The risk is generally associated with bonds; however, because companies in the real estate sector and smaller companies often borrow money to finance their operations, they may be adversely affected by rising interest rates.

Liquidity risk

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

Investments not guaranteed by
Delaware Management Company
(Manager) or its affiliates

Neither the Manager nor its affiliates noted in this document are authorized deposit-taking institutions for the purposes of the Banking Act 1959 (Commonwealth of Australia). The obligations of these entities do not represent deposits or other liabilities of Macquarie Bank Limited (MBL). MBL does not guarantee or otherwise provide assurance in respect of the obligations of these entities, unless noted otherwise.

Risk, Lose Money rr_RiskLoseMoney
Investing in any mutual fund involves the risk that you may lose part or all of the money you invest.
Risk, Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution
Neither the Manager nor its affiliates noted in this document are authorized deposit-taking institutions for the purposes of the Banking Act 1959 (Commonwealth of Australia). The obligations of these entities do not represent deposits or other liabilities of Macquarie Bank Limited (MBL). MBL does not guarantee or otherwise provide assurance in respect of the obligations of these entities, unless noted otherwise.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

How has The Emerging Markets Portfolio II performed?
Performance, Narrative rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio's performance from year to year and by showing how the Portfolio's average annual total returns for the 1-year, 5-year, and lifetime periods compare with those of a broad measure of market performance. The Portfolio'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 Portfolio's most recently available month-end performance by calling 800 231-8002 or by visiting our website at delawareinvestments.com/institutional.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns
The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the Portfolio's performance from year to year and by showing how the Portfolio's average annual total returns for the 1-year, 5-year, and lifetime periods compare with those of a broad measure of market performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone
800 231-8002
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress
delawareinvestments.com/institutional
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture
The Portfolio's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart, Heading rr_BarChartHeading

Year-by-year total return (The Emerging Markets Portfolio II)
Bar Chart, Closing rr_BarChartClosingTextBlock

During the period illustrated in this bar chart, The Emerging Markets Portfolio II's highest quarterly return was 12.68% for the quarter ended Sept. 30, 2013 and its lowest quarterly return was -24.40% for the quarter ended Sept. 30, 2011.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel
highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel
lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.40%)
Performance Table, Heading rr_PerformanceTableHeading

Average annual total returns for periods ended December 31, 2015
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate
The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the Portfolio's lifetime and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred
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 Table, Closing rr_PerformanceTableClosingTextBlock

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 Portfolio's lifetime and do not reflect the impact of state and local taxes.
Equity Oriented or Fixed Income Oriented Funds | The Emerging Markets Portfolio II | MSCI Emerging Markets Index (gross returns)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes
reflects no deduction for fees, expenses, or taxes
1 Year rr_AverageAnnualReturnYear01 (14.60%)
5 Years rr_AverageAnnualReturnYear05 (4.47%)
Lifetime rr_AverageAnnualReturnSinceInception 0.17%
Equity Oriented or Fixed Income Oriented Funds | The Emerging Markets Portfolio II | MSCI Emerging Markets Index (net returns)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes
reflects no deduction for fees or expenses
1 Year rr_AverageAnnualReturnYear01 (14.92%)
5 Years rr_AverageAnnualReturnYear05 (4.81%)
Lifetime rr_AverageAnnualReturnSinceInception (0.18%)
Equity Oriented or Fixed Income Oriented Funds | The Emerging Markets Portfolio II | DPT CLASS  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 1.00%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.35%
Total annual portfolio operating expenses rr_ExpensesOverAssets 1.35%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.15%) [1]
Total annual portfolio operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.20%
1 Year rr_ExpenseExampleYear01 $ 122
3 Years rr_ExpenseExampleYear03 413
5 Years rr_ExpenseExampleYear05 725
10 Years rr_ExpenseExampleYear10 $ 1,611
Annual Return 2011 rr_AnnualReturn2011 (19.58%)
Annual Return 2012 rr_AnnualReturn2012 14.42%
Annual Return 2013 rr_AnnualReturn2013 10.47%
Annual Return 2014 rr_AnnualReturn2014 (6.71%)
Annual Return 2015 rr_AnnualReturn2015 (17.01%)
1 Year rr_AverageAnnualReturnYear01 (17.01%)
5 Years rr_AverageAnnualReturnYear05 (4.68%)
Lifetime rr_AverageAnnualReturnSinceInception (1.15%)
Equity Oriented or Fixed Income Oriented Funds | The Emerging Markets Portfolio II | DPT CLASS | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (17.73%)
5 Years rr_AverageAnnualReturnYear05 (5.40%)
Lifetime rr_AverageAnnualReturnSinceInception (1.86%)
Equity Oriented or Fixed Income Oriented Funds | The Emerging Markets Portfolio II | DPT CLASS | After Taxes on Distributions and sale of Portfolio shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (8.77%)
5 Years rr_AverageAnnualReturnYear05 (3.42%)
Lifetime rr_AverageAnnualReturnSinceInception (0.80%)
[1] The Portfolio's investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual portfolio operating expenses from exceeding 1.20% of the Portfolio's average daily net assets from Feb. 26, 2016 through Feb. 28, 2017. These waivers and reimbursements may only be terminated by agreement of the Manager and the Portfolio.