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EQUITY ORIENTED | Macquarie Large Cap Value Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Macquarie Large Cap Value Portfolio
Investment Objective, Heading rr_ObjectiveHeading What is the Portfolio’s investment objective?
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

Macquarie Large Cap Value Portfolio 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)
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 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
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 securities of large-capitalization companies that the Manager believes have long-term capital appreciation potential. The Portfolio currently defines large-capitalization stocks as those with market capitalizations of $5 billion or greater at the time of purchase. The Manager follows a value-oriented investment philosophy in selecting stocks for the Portfolio using a research-intensive approach that considers factors such as: security prices that reflect a market valuation that is judged to be below the estimated present or future value of the company; favorable earning prospects and dividend yield; the financial condition of the issuer; and various qualitative factors. Typically, the Manager seeks to select securities that it believes are undervalued in relation to their intrinsic value as indicated by multiple factors, including the earnings and cash-flow potential or the asset value of the respective issuers. The Manager also considers a company’s plans for future operations on a selective basis.

Under normal circumstances, at least 80% of the Portfolio’s net assets, plus any borrowings for investment purposes, will be invested in equity securities of large-capitalization companies (80% Policy). The Portfolio’s 80% Policy may be changed without shareholder approval. However, shareholders will be given notice at least 60 days prior to any such change.

The Manager may sell a security if it no longer believes the security will contribute to meeting the investment objective of the Portfolio. In considering whether to sell a security, the Manager may evaluate, among other things, the factors listed above, the condition of the US economy, the condition of non-US economies, and changes in the condition and outlook in the issuer’s industry sector.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, at least 80% of the Portfolio’s net assets, plus any borrowings for investment purposes, will be invested in equity securities of large-capitalization companies (80% Policy).
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. The Portfolio’s 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.
Liquidity risk The possibility that securities cannot be readily sold within seven calendar days at approximately the price at which a portfolio has valued them.
Active management and selection risk The risk that the securities selected by a portfolio’s management will underperform the markets, the relevant indices, or the securities selected by other portfolios with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.

The Manager is an indirect wholly owned subsidiary of Macquarie Group Limited (MGL). Other than Macquarie Bank Limited (MBL), a subsidiary of MGL and an affiliate of the Manager, none of the entities noted 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 MBL. MBL does not guarantee or otherwise provide assurance in respect of the obligations of these entities, unless noted otherwise. The Portfolio is governed by US laws and regulations.
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. 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.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading How has Macquarie Large Cap Value Portfolio 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-, 5-, and 10-year 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 macquarieim.com/investments/products/macquarie-institutional-portfolios.
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-, 5-, and 10-year 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 macquarieim.com/investments/products/macquarie-institutional-portfolios
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 Calendar year-by-year total return (Macquarie Large Cap Value Portfolio)
Bar Chart, Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Macquarie Large Cap Value Portfolio’s highest quarterly return was 14.29% for the quarter ended Dec. 31, 2011 and its lowest quarterly return was -12.77% for the quarter ended Sept. 30, 2011.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.77%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
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-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table Footnotes rr_PerformanceTableFootnotesTextBlock

Frank Russell Company is the source and owner of the trademarks, service marks, and copyrights related to the Russell Indexes. Russell® is a trademark of Frank Russell Company.
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-advantaged 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 | Macquarie Large Cap Value Portfolio | Russell 1000® Value Index (reflects no deduction for fees, expenses, or taxes)  
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 26.54%
5 years rr_AverageAnnualReturnYear05 8.29%
10 years rr_AverageAnnualReturnYear10 11.80%
EQUITY ORIENTED | Macquarie Large Cap Value Portfolio | DPT CLASS  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DPDEX
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual portfolio operating expenses rr_ExpensesOverAssets 0.75%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 0.05% [1]
Total annual portfolio operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.70%
1 year rr_ExpenseExampleYear01 $ 72
3 years rr_ExpenseExampleYear03 235
5 years rr_ExpenseExampleYear05 412
10 years rr_ExpenseExampleYear10 $ 926
Annual Return 2010 rr_AnnualReturn2010 15.57%
Annual Return 2011 rr_AnnualReturn2011 10.46%
Annual Return 2012 rr_AnnualReturn2012 15.32%
Annual Return 2013 rr_AnnualReturn2013 33.13%
Annual Return 2014 rr_AnnualReturn2014 14.23%
Annual Return 2015 rr_AnnualReturn2015 (0.74%)
Annual Return 2016 rr_AnnualReturn2016 14.64%
Annual Return 2017 rr_AnnualReturn2017 13.69%
Annual Return 2018 rr_AnnualReturn2018 (2.64%)
Annual Return 2019 rr_AnnualReturn2019 20.14%
1 year rr_AverageAnnualReturnYear01 20.14%
5 years rr_AverageAnnualReturnYear05 8.64%
10 years rr_AverageAnnualReturnYear10 12.98%
EQUITY ORIENTED | Macquarie Large Cap Value Portfolio | DPT CLASS | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 10.86%
5 years rr_AverageAnnualReturnYear05 4.67%
10 years rr_AverageAnnualReturnYear10 10.62%
EQUITY ORIENTED | Macquarie Large Cap Value Portfolio | DPT CLASS | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 18.37%
5 years rr_AverageAnnualReturnYear05 6.41%
10 years rr_AverageAnnualReturnYear10 10.59%
[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 dividend and 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 0.70% of the Portfolio's average daily net assets from Feb. 28, 2020 through Mar. 1, 2021. The waivers and reimbursements may only be terminated by agreement of the Manager and the Portfolio.