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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
SEC Form dei_DocumentType 485BPOS
Period end date dei_DocumentPeriodEndDate Jul. 31, 2020
Registrant Name dei_EntityRegistrantName DELAWARE GROUP INCOME FUNDS
Registrant CIK dei_EntityCentralIndexKey 0000027825
Amendment Flag dei_AmendmentFlag false
Prospectus #1  
Prospectus [Line Items] rr_ProspectusLineItems  
Prospectus Date rr_ProspectusDate Nov. 27, 2020
Risk/Return rr_RiskReturnHeading Prospectus
Prospectus #1 | Delaware Corporate Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Corporate Bond Fund seeks to provide investors with total return.
Expense rr_ExpenseHeading What are the Fund’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 Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie. More information about these and other discounts is available from your financial intermediary, 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.”

Portfolio Turnover rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover 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 the 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 172% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 172.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative 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. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed 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:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in corporate bonds (80% policy). Delaware Management Company (Manager) focuses on corporate bonds that have investment grade credit ratings from a nationally recognized statistical rating organization (NRSRO). The bonds the Manager selects for the portfolio are typically rated BBB- and above by Standard & Poor’s Financial Services LLC (S&P), Baa3 and above by Moody’s Investors Service, Inc. (Moody’s), or similarly rated by another NRSRO. The Manager may also invest in unrated bonds if it believes their credit quality is comparable to those that have investment grade ratings.

In addition, the Manager may seek investment advice and recommendations from its affiliates: Macquarie Investment Management Austria Kapitalanlage AG (MIMAK), Macquarie Investment Management Europe Limited (MIMEL), and Macquarie Investment Management Global Limited (MIMGL) (together, the “Affiliated Sub-Advisors”). The Manager may also permit these Affiliated Sub-Advisors to execute Fund security trades on behalf of the Manager and exercise investment discretion for securities in certain markets where the Manager believes it will be beneficial to utilize an Affiliated Sub-Advisor's specialized market knowledge.

The Fund may also invest up to 20% of its net assets in high yield corporate bonds (“junk bonds”). In addition, the Fund may invest up to 40% of its total assets in foreign securities, but the Fund’s total non-US-dollar currency exposure will be limited, in the aggregate, to no more than 25% of net assets.

The average portfolio duration of the Fund will generally vary within two years (plus or minus) of the current average duration of the Bloomberg Barclays US Corporate Investment Grade Index, which as of Dec. 31, 2019, was 7.89 years. Duration measures a bond’s sensitivity to interest rates by indicating the approximate change in a bond or bond fund’s price given a 1% change in interest rates.

The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in corporate bonds (80% policy).
Risk rr_RiskHeading What are the principal risks of investing in the Fund?
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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

High yield (junk bond) risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities. High yield bonds are sometimes issued by municipalities that have less financial strength and therefore have less ability to make projected debt payments on the bonds.

Loans and other indebtedness risk — The risk that a fund will not receive payment of principal, interest, and other amounts due in connection with these investments and will depend primarily on the financial condition of the borrower and the lending institution. A fund’s ability to sell its loans or to realize their full value upon sale may also be impaired due to the lack of an active trading market, irregular trading activity, wide bid/ask spreads, contractual restrictions, and extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.

 

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.

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as banking) will decline because of changing expectations for the performance of that industry or sector.

IBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) or similar interbank offered rates (“IBORs,” such as the Euro Overnight Index Average (EONIA)) could have adverse impacts on financial instruments that reference LIBOR or a similar rate. While some instruments may contemplate a scenario where LIBOR or a similar rate is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR and similar rates could affect the value and liquidity of instruments that reference such rates, especially those that do not have fallback provisions. The use of alternative reference rate products may impact investment strategy performance.

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.

Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Risk Closing rr_RiskClosingTextBlock

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 Fund 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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio.
Bar Chart and Performance Table rr_BarChartAndPerformanceTableHeading How has Delaware Corporate Bond Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart Narrative rr_BarChartNarrativeTextBlock 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.
Bar Chart Closing rr_BarChartClosingTextBlock

As of Sept. 30, 2020, the Fund’s Class A shares had a calendar year-to-date return of 7.21%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 6.38% for the quarter ended Sept. 30, 2010, and its lowest quarterly return was -3.51% for the quarter ended June 30, 2013. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/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. Class R6 shares had not commenced operations as of Dec. 31, 2018 and are therefore not included below.
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 periods presented 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 One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

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-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 periods presented and do not reflect the impact of state and local taxes.
Prospectus #1 | Delaware Corporate Bond Fund | Bloomberg Barclays US Corporate Investment Grade Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
1 year rr_AverageAnnualReturnYear01 14.54%
5 years rr_AverageAnnualReturnYear05 4.60%
10 years rr_AverageAnnualReturnYear10 5.54%
Prospectus #1 | Delaware Corporate Bond Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DGCAX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.18% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.91%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 530
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 719
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 923
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,511
2010 rr_AnnualReturn2010 11.49%
2011 rr_AnnualReturn2011 7.31%
2012 rr_AnnualReturn2012 14.59%
2013 rr_AnnualReturn2013 (0.60%)
2014 rr_AnnualReturn2014 6.81%
2015 rr_AnnualReturn2015 (1.98%)
2016 rr_AnnualReturn2016 5.44%
2017 rr_AnnualReturn2017 7.18%
2018 rr_AnnualReturn2018 (4.00%)
2019 rr_AnnualReturn2019 15.91%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 7.21%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.38%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.51%)
1 year rr_AverageAnnualReturnYear01 10.63%
5 years rr_AverageAnnualReturnYear05 3.31%
10 years rr_AverageAnnualReturnYear10 5.53%
Prospectus #1 | Delaware Corporate Bond Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 9.07%
5 years rr_AverageAnnualReturnYear05 1.76%
10 years rr_AverageAnnualReturnYear10 3.45%
Prospectus #1 | Delaware Corporate Bond Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 6.25%
5 years rr_AverageAnnualReturnYear05 1.80%
10 years rr_AverageAnnualReturnYear10 3.42%
Prospectus #1 | Delaware Corporate Bond Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DGCCX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.18% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.66%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 260
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 515
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 894
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,958
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 160
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 515
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 894
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,958
1 year rr_AverageAnnualReturnYear01 14.05%
5 years rr_AverageAnnualReturnYear05 3.49%
10 years rr_AverageAnnualReturnYear10 5.23%
Prospectus #1 | Delaware Corporate Bond Fund | Class R  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DGCRX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.18% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.16%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.07%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 109
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 360
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 630
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,401
1 year rr_AverageAnnualReturnYear01 15.81%
5 years rr_AverageAnnualReturnYear05 4.04%
10 years rr_AverageAnnualReturnYear10 5.75%
Prospectus #1 | Delaware Corporate Bond Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DGCIX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.18% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.66%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 58
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 359
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 814
1 year rr_AverageAnnualReturnYear01 16.20%
5 years rr_AverageAnnualReturnYear05 4.53%
10 years rr_AverageAnnualReturnYear10 6.26%
Prospectus #1 | Delaware Corporate Bond Fund | Class R6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DGCZX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.09% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.57%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 174
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 309
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 705
Lifetime rr_AverageAnnualReturnSinceInception 12.97%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 31, 2019
Prospectus #1 | Delaware Extended Duration Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Extended Duration Bond Fund seeks to provide investors with total return.
Expense rr_ExpenseHeading What are the Fund’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 Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie. More information about these and other discounts is available from your financial intermediary, 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.”

Portfolio Turnover rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover 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 the 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 108%  of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 108.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative 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. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed 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:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in corporate bonds (80% policy). Delaware Management Company (Manager) focuses on corporate bonds that have investment grade credit ratings from a nationally recognized statistical rating organization (NRSRO). The bonds the Manager selects for the portfolio are typically rated BBB- and above by S&P, Baa3 and above by Moody’s, or similarly rated by another NRSRO. The Manager may also invest in unrated bonds if it believes their credit quality is comparable to those that have investment grade ratings.

In addition, the Manager may seek investment advice and recommendations from its affiliates: Macquarie Investment Management Austria Kapitalanlage AG (MIMAK), Macquarie Investment Management Europe Limited (MIMEL), and Macquarie Investment Management Global Limited (MIMGL) (together, the “Affiliated Sub-Advisors”). The Manager may also permit these Affiliated Sub-Advisors to execute Fund security trades on behalf of the Manager and exercise investment discretion for securities in certain markets where the Manager believes it will be beneficial to utilize an Affiliated Sub-Advisor's specialized market knowledge.

The Fund may also invest up to 20% of its net assets in high yield corporate bonds (“junk bonds”). In addition, the Fund may invest up to 40% of its total assets in foreign securities, but the Fund’s total non-US-dollar currency exposure will be limited, in the aggregate, to no more than 25% of net assets.

The average portfolio duration of the Fund will generally vary within two years (plus or minus) of the current average duration of the Bloomberg Barclays Long US Corporate Index, which as of Dec. 31, 2019, was 14.47 years. Duration measures a bond’s sensitivity to interest rates by indicating the approximate change in a bond or bond fund’s price given a 1% change in interest rates. In general, securities with longer durations are more sensitive to interest rate charges.

The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in corporate bonds (80% policy).
Risk rr_RiskHeading What are the principal risks of investing in the Fund?
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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

High yield (junk bond) risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities. High yield bonds are sometimes issued by municipalities that have less financial strength and therefore have less ability to make projected debt payments on the bonds.

Loans and other indebtedness risk — The risk that a fund will not receive payment of principal, interest, and other amounts due in connection with these investments and will depend primarily on the financial condition of the borrower and the lending institution. A fund’s ability to sell its loans or to realize their full value upon sale may also be impaired due to the lack of an active trading market, irregular trading activity, wide bid/ask spreads, contractual restrictions, and

 

extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.

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.

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as electric) will decline because of changing expectations for the performance of that industry or sector.

IBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) or similar interbank offered rates (“IBORs,” such as the Euro Overnight Index Average (EONIA)) could have adverse impacts on financial instruments that reference LIBOR or a similar rate. While some instruments may contemplate a scenario where LIBOR or a similar rate is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR and similar rates could affect the value and liquidity of instruments that reference such rates, especially those that do not have fallback provisions. The use of alternative reference rate products may impact investment strategy performance.

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.

Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Risk Closing rr_RiskClosingTextBlock

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 Fund 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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio.
Bar Chart and Performance Table rr_BarChartAndPerformanceTableHeading How has Delaware Extended Duration Bond Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart Narrative rr_BarChartNarrativeTextBlock 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 or lifetime 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.
Bar Chart Closing rr_BarChartClosingTextBlock As of Sept. 30, 2020, the Fund’s Class A shares had a calendar year-to-date return of 8.74%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 7.96% for the quarter ended Sept. 30, 2011, and its lowest quarterly return was -7.05% for the quarter ended June 30, 2015.

The

 

maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/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 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 periods presented 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 One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

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-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 periods presented and do not reflect the impact of state and local taxes.
Prospectus #1 | Delaware Extended Duration Bond Fund | Bloomberg Barclays Long US Corporate Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
1 year rr_AverageAnnualReturnYear01 23.89%
5 years rr_AverageAnnualReturnYear05 6.40%
10 years rr_AverageAnnualReturnYear10 7.99%
Prospectus #1 | Delaware Extended Duration Bond Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DEEAX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [4]
Management fees rr_ManagementFeesOverAssets 0.54%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.17% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 530
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 729
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 944
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,563
2010 rr_AnnualReturn2010 14.31%
2011 rr_AnnualReturn2011 16.50%
2012 rr_AnnualReturn2012 16.40%
2013 rr_AnnualReturn2013 (4.00%)
2014 rr_AnnualReturn2014 15.90%
2015 rr_AnnualReturn2015 (4.77%)
2016 rr_AnnualReturn2016 7.24%
2017 rr_AnnualReturn2017 12.11%
2018 rr_AnnualReturn2018 (8.13%)
2019 rr_AnnualReturn2019 22.68%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 8.74%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.96%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.05%)
1 year rr_AverageAnnualReturnYear01 17.20%
5 years rr_AverageAnnualReturnYear05 4.27%
10 years rr_AverageAnnualReturnYear10 7.83%
Prospectus #1 | Delaware Extended Duration Bond Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 14.57%
5 years rr_AverageAnnualReturnYear05 2.50%
10 years rr_AverageAnnualReturnYear10 5.38%
Prospectus #1 | Delaware Extended Duration Bond Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 10.11%
5 years rr_AverageAnnualReturnYear05 2.43%
10 years rr_AverageAnnualReturnYear10 5.15%
Prospectus #1 | Delaware Extended Duration Bond Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DEECX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice 100.00% [4]
Management fees rr_ManagementFeesOverAssets 0.54%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.17% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 1.71%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 260
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 525
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 915
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,008
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 160
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 525
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 915
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,008
1 year rr_AverageAnnualReturnYear01 20.77%
5 years rr_AverageAnnualReturnYear05 4.44%
10 years rr_AverageAnnualReturnYear10 7.52%
Prospectus #1 | Delaware Extended Duration Bond Fund | Class R  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DEERX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [4]
Management fees rr_ManagementFeesOverAssets 0.54%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.17% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 1.21%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.07%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 109
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 370
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 652
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,454
1 year rr_AverageAnnualReturnYear01 22.34%
5 years rr_AverageAnnualReturnYear05 4.96%
10 years rr_AverageAnnualReturnYear10 8.05%
Prospectus #1 | Delaware Extended Duration Bond Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DEEIX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [4]
Management fees rr_ManagementFeesOverAssets 0.54%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.17% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 0.71%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 58
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 213
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 381
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 869
1 year rr_AverageAnnualReturnYear01 23.01%
5 years rr_AverageAnnualReturnYear05 5.49%
10 years rr_AverageAnnualReturnYear10 8.60%
Prospectus #1 | Delaware Extended Duration Bond Fund | Class R6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DEZRX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [4]
Management fees rr_ManagementFeesOverAssets 0.54%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.08% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 0.62%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 184
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 332
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 761
1 year rr_AverageAnnualReturnYear01 23.07%
Lifetime rr_AverageAnnualReturnSinceInception 7.08%
Inception Date rr_AverageAnnualReturnInceptionDate May 02, 2016
Prospectus #2  
Prospectus [Line Items] rr_ProspectusLineItems  
Prospectus Date rr_ProspectusDate Nov. 27, 2020
Risk/Return rr_RiskReturnHeading Prospectus
Prospectus #2 | Delaware Floating Rate Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Floating Rate Fund seeks high current income and, secondarily, long-term total return.
Expense rr_ExpenseHeading What are the Fund’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 Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie. More information about these and other discounts is available from your financial intermediary, 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.”

Portfolio Turnover rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover 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 the 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 125%  of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 125.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative 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. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed 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:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in floating rate loans and other floating rate debt securities (80% policy). Delaware Management Company (Manager) will determine how much of the Fund’s assets to allocate among the different types of securities in which the Fund may invest based on its evaluation of economic and market conditions and its assessment of the returns and potential for appreciation that can be achieved from various sectors of the fixed income market.

In addition, the Manager may seek investment advice and recommendations from its affiliates: Macquarie Investment Management Austria Kapitalanlage AG (MIMAK), Macquarie Investment Management Europe Limited (MIMEL), and Macquarie Investment Management Global Limited (MIMGL) (together, the “Affiliated Sub-Advisors”). The Manager may also permit these Affiliated Sub-Advisors to execute Fund security trades on behalf of the Manager and exercise investment discretion for securities in certain markets where the Manager believes it will be beneficial to utilize an Affiliated Sub-Advisor's specialized market knowledge.

The Fund's investments may be variable- and floating-rate debt securities that generally pay interest at rates that adjust whenever a specified interest rate changes and/or reset on predetermined dates (such as the last day of a month or calendar quarter). Derivatives instruments may be utilized to effectively convert the fixed-rate interest payments from a group of certain Fund portfolio securities into floating-rate interest payments. The average portfolio duration (that is, the sensitivity to general changes in interest rates) of this Fund will generally not exceed one year.

Up to 100% of the Fund’s total assets may be allocated to below-investment-grade securities within the Fund. Investments in emerging markets will, in the aggregate, be limited to no more than 15% of the Fund’s total assets. The Manager will limit non-US-dollar-denominated securities to no more than 50% of net assets, but total non-US-dollar currency exposure will be limited, in the aggregate, to no more than 25% of net assets. The Fund may also invest up to 50% of its total assets in a wide range of derivatives instruments, including forward foreign currency contracts, options, futures contracts, options on futures contracts, and swaps, for both hedging and nonhedging purposes. In addition, the Fund may hold a portion of its assets in cash or cash equivalents.

The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in floating rate loans and other floating rate debt securities (80% policy).
Risk rr_RiskHeading What are the principal risks of investing in the Fund?
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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

Loans and other indebtedness risk — The risk that a fund will not receive payment of principal, interest, and other amounts due in connection with these investments and will depend primarily on the financial condition of the borrower and the lending institution. A fund’s ability to sell its loans or to realize their full value upon sale may also be impaired due to the lack of an active trading market, irregular trading activity, wide bid/ask spreads, contractual restrictions, and extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

High yield (junk bond) risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities. High yield bonds are sometimes issued by municipalities that have less financial strength and therefore have less ability to make projected debt payments on the bonds.

 

Adjustable rate securities risk — During periods of rising interest rates, because changes in interest rates on adjustable rate securities may lag behind changes in market rates, the value of such securities may decline until their interest rates reset to market rates. During periods of declining interest rates, because the interest rates on adjustable rate securities generally reset downward, their market value is unlikely to rise to the same extent as the value of comparable fixed rate securities.

Prepayment risk — The risk that the principal on a bond that is held by a fund will be prepaid prior to maturity at a time when interest rates are lower than what that bond was paying. A fund  may then have to reinvest that money at a lower interest rate.

Foreign and emerging markets risk — The risk that international investing (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. The risk associated with international investing will be greater in emerging markets than in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.

IBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) or similar interbank offered rates (“IBORs,” such as the Euro Overnight Index Average (EONIA)) could have adverse impacts on financial instruments that reference LIBOR or a similar rate. While some instruments may contemplate a scenario where LIBOR or a similar rate is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR and similar rates could affect the value and liquidity of instruments that reference such rates, especially those that do not have fallback provisions. The use of alternative reference rate products may impact investment strategy performance.

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

Derivatives risk — Derivatives contracts, such as futures, forward foreign currency contracts, options, and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, index, reference rate, or other asset or market factor to which a derivatives contract is associated, moves in the opposite direction from what the portfolio manager anticipated. When used for hedging, the change in value of the derivatives instrument may also not correlate specifically with the currency, rate, or other risk being hedged, in which case a fund may not realize the intended benefits. Derivatives contracts are also subject to the risk that the counterparty may fail to perform its obligations under the contract due to, among other reasons, financial difficulties (such as a bankruptcy or reorganization).

Leveraging risk — The risk that certain fund transactions, such as reverse repurchase agreements, short sales, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions, or derivatives instruments, may give rise to leverage, causing a fund to be more volatile than if it had not been leveraged, which may result in increased losses to the fund.

Valuation risk — The risk that a less liquid secondary market may make it more difficult for a fund to obtain precise valuations of certain securities in its portfolio.

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.

Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Risk Closing rr_RiskClosingTextBlock

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 Fund 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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio.
Bar Chart and Performance Table rr_BarChartAndPerformanceTableHeading How has Delaware Floating Rate Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart Narrative rr_BarChartNarrativeTextBlock 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-year, 5-year, and lifetime 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.
Bar Chart Closing rr_BarChartClosingTextBlock

As of Sept. 30, 2020, the Fund’s Class A shares had a calendar year-to-date return of -1.07%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 3.77% for the quarter ended March 31, 2019, and its lowest quarterly return was -2.93% for the quarter ended Dec. 31, 2018. The maximum Class A sales charge of 2.75%, which is normally deducted when you purchase shares, is not reflected in the highest/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 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 periods presented 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 One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Footnotes rr_PerformanceTableFootnotesTextBlock (1) The performance prior to Jan. 31, 2017 was based upon a diversified floating rate security strategy.
Performance Table Closing rr_PerformanceTableClosingTextBlock

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-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 periods presented and do not reflect the impact of state and local taxes.
Prospectus #2 | Delaware Floating Rate Fund | S&P/LSTA Leveraged Loan Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes) (new benchmark)
1 year rr_AverageAnnualReturnYear01 8.64%
5 years rr_AverageAnnualReturnYear05 4.45%
Lifetime rr_AverageAnnualReturnSinceInception 4.85%
Prospectus #2 | Delaware Floating Rate Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DDFAX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.75%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [7]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.30%
Total annual fund operating expenses rr_ExpensesOverAssets 1.05%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [8]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 368
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 589
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 828
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,513
2011 rr_AnnualReturn2011 0.17%
2012 rr_AnnualReturn2012 5.39%
2013 rr_AnnualReturn2013 1.74%
2014 rr_AnnualReturn2014 0.30%
2015 rr_AnnualReturn2015 (0.83%)
2016 rr_AnnualReturn2016 3.52%
2017 rr_AnnualReturn2017 3.53%
2018 rr_AnnualReturn2018 0.63%
2019 rr_AnnualReturn2019 9.09%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (1.07%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.77%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.93%)
1 year rr_AverageAnnualReturnYear01 6.05%
5 years rr_AverageAnnualReturnYear05 2.55%
Lifetime rr_AverageAnnualReturnSinceInception 2.34%
Prospectus #2 | Delaware Floating Rate Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 3.84%
5 years rr_AverageAnnualReturnYear05 1.14%
Lifetime rr_AverageAnnualReturnSinceInception 1.23%
Prospectus #2 | Delaware Floating Rate Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 3.54%
5 years rr_AverageAnnualReturnYear05 1.32%
Lifetime rr_AverageAnnualReturnSinceInception 1.32%
Prospectus #2 | Delaware Floating Rate Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DDFCX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [7]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.30%
Total annual fund operating expenses rr_ExpensesOverAssets 1.80%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [8]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 272
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 556
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 965
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,107
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 172
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 556
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 965
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,107
1 year rr_AverageAnnualReturnYear01 7.15%
5 years rr_AverageAnnualReturnYear05 2.34%
Lifetime rr_AverageAnnualReturnSinceInception 1.86%
Prospectus #2 | Delaware Floating Rate Fund | Class R  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DDFFX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [7]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.30%
Total annual fund operating expenses rr_ExpensesOverAssets 1.30%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [8]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 401
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 702
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,558
1 year rr_AverageAnnualReturnYear01 8.69%
5 years rr_AverageAnnualReturnYear05 2.85%
Lifetime rr_AverageAnnualReturnSinceInception 2.36%
Prospectus #2 | Delaware Floating Rate Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DDFLX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [7]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.30%
Total annual fund operating expenses rr_ExpensesOverAssets 0.80%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [8]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 244
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 433
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 980
1 year rr_AverageAnnualReturnYear01 9.36%
5 years rr_AverageAnnualReturnYear05 3.38%
Lifetime rr_AverageAnnualReturnSinceInception 2.89%
Prospectus #3  
Prospectus [Line Items] rr_ProspectusLineItems  
Prospectus Date rr_ProspectusDate Nov. 27, 2020
Risk/Return rr_RiskReturnHeading Prospectus
Prospectus #3 | Delaware High-Yield Opportunities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective rr_ObjectiveHeading What are the Fund’s investment objectives?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware High-Yield Opportunities Fund seeks total return and, as a secondary objective, high current income.
Expense Narrative rr_ExpenseNarrativeTextBlock

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 $100,000 in Delaware Funds® by Macquarie. More information about these and other discounts is available from your financial intermediary, 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.”

Portfolio Turnover rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover 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 the 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 108%  of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 108.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative 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. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed 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:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in fixed income securities rated at the time of purchase lower than BBB- by Standard & Poor’s Financial Services LLC (S&P), Baa3 by Moody’s Investors Services, Inc. (Moody’s), or similarly rated by another nationally recognized statistical rating organization (NRSRO) (80% policy). These are commonly known as high yield bonds or “junk bonds” and involve greater risks than investment grade bonds. The Fund may also invest in unrated bonds that the Manager determines to be of comparable quality. Unrated bonds may be more speculative in nature than rated bonds. The Fund may also invest in US and foreign government securities and corporate bonds of foreign issuers. The Fund may invest up to 40% of its net assets in foreign securities; however, the Fund’s total non-US-dollar currency exposure will be limited, in the aggregate, to no more than 25% of the Fund’s net assets, and investments in emerging market securities will be limited to 20% of the Fund’s net assets. In selecting bonds for the portfolio, the Manager evaluates the income provided by the bond and the bond’s appreciation potential as well as the issuer’s ability to make income and principal payments.

In addition, the Manager may seek investment advice and recommendations from its affiliates: Macquarie Investment Management Austria Kapitalanlage AG (MIMAK), Macquarie Investment Management Europe Limited (MIMEL), and Macquarie Investment Management Global Limited (MIMGL) (together, the “Affiliated Sub-Advisors”). The Manager may also permit these Affiliated Sub-Advisors to execute Fund security trades on behalf of the Manager and exercise investment discretion for securities in certain markets where the Manager believes it will be beneficial to utilize an Affiliated Sub-Advisor's specialized market knowledge.

The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in fixed income securities rated at the time of purchase lower than BBB- by Standard & Poor’s Financial Services LLC (S&P), Baa3 by Moody’s Investors Services, Inc. (Moody’s), or similarly rated by another nationally recognized statistical rating organization (NRSRO) (80% policy).
Risk rr_RiskHeading What are the principal risks of investing in the Fund?
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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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.

High yield (junk bond) risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities. High yield bonds are sometimes issued by municipalities that have less financial strength and therefore have less ability to make projected debt payments on the bonds.

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

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.

Loans and other indebtedness risk — The risk that a fund will not receive payment of principal, interest, and other amounts due in connection with these investments and will depend primarily on the financial condition of the borrower and the lending institution. A fund’s ability to sell its loans or to realize their full value upon sale may also be impaired due to the lack of an active trading market, irregular trading activity, wide bid/ask spreads, contractual restrictions, and

 

extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.

IBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) or similar interbank offered rates (“IBORs,” such as the Euro Overnight Index Average (EONIA)) could have adverse impacts on financial instruments that reference LIBOR or a similar rate. While some instruments may contemplate a scenario where LIBOR or a similar rate is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR and similar rates could affect the value and liquidity of instruments that reference such rates, especially those that do not have fallback provisions. The use of alternative reference rate products may impact investment strategy performance.

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

Valuation risk — The risk that a less liquid secondary market may make it more difficult for a fund to obtain precise valuations of certain securities in its portfolio.

Redemption risk — If investors redeem more shares of a fund than are purchased for an extended period of time, a fund may be required to sell securities without regard to the investment merits of such actions. This could decrease a fund’s asset base, potentially resulting in a higher expense ratio.

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.

Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Risk Closing rr_RiskClosingTextBlock

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 Fund 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 Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio.
Bar Chart and Performance Table rr_BarChartAndPerformanceTableHeading How has Delaware High-Yield Opportunities Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart Narrative rr_BarChartNarrativeTextBlock 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.
Bar Chart Closing rr_BarChartClosingTextBlock As of Sept. 30, 2020, the Fund’s Class A shares had a calendar year-to-date return of 1.01%. During the periods illustrated in this bar chart, Class A’s highest quarterly return was 7.57% for the quarter ended March 31, 2019, and its lowest quarterly return was -9.43% for the quarter ended Sept. 30, 2011.

 

The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/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 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 periods presented 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 One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

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-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 periods presented and do not reflect the impact of state and local taxes.
Prospectus #3 | Delaware High-Yield Opportunities Fund | ICE BofA US High Yield Constrained Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
1 year rr_AverageAnnualReturnYear01 14.41%
5 years rr_AverageAnnualReturnYear05 6.14%
10 years rr_AverageAnnualReturnYear10 7.48%
Prospectus #3 | Delaware High-Yield Opportunities Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DHOAX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [9]
Management fees rr_ManagementFeesOverAssets 0.65%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 1.16%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [10]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 542
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 781
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,039
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,777
2010 rr_AnnualReturn2010 16.31%
2011 rr_AnnualReturn2011 1.91%
2012 rr_AnnualReturn2012 17.38%
2013 rr_AnnualReturn2013 8.79%
2014 rr_AnnualReturn2014 (0.47%)
2015 rr_AnnualReturn2015 (6.72%)
2016 rr_AnnualReturn2016 12.88%
2017 rr_AnnualReturn2017 7.04%
2018 rr_AnnualReturn2018 (4.62%)
2019 rr_AnnualReturn2019 15.89%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.01%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.57%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (9.43%)
1 year rr_AverageAnnualReturnYear01 10.78%
5 years rr_AverageAnnualReturnYear05 3.54%
10 years rr_AverageAnnualReturnYear10 6.01%
Prospectus #3 | Delaware High-Yield Opportunities Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 8.37%
5 years rr_AverageAnnualReturnYear05 1.13%
10 years rr_AverageAnnualReturnYear10 3.35%
Prospectus #3 | Delaware High-Yield Opportunities Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 year rr_AverageAnnualReturnYear01 6.32%
5 years rr_AverageAnnualReturnYear05 1.57%
10 years rr_AverageAnnualReturnYear10 3.49%
Prospectus #3 | Delaware High-Yield Opportunities Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DHOCX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [9]
Management fees rr_ManagementFeesOverAssets 0.65%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 1.91%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [10]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 272
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 579
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,011
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,215
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 172
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 579
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,011
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,215
1 year rr_AverageAnnualReturnYear01 14.04%
5 years rr_AverageAnnualReturnYear05 3.72%
10 years rr_AverageAnnualReturnYear10 5.70%
Prospectus #3 | Delaware High-Yield Opportunities Fund | Class R  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DHIRX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [9]
Management fees rr_ManagementFeesOverAssets 0.65%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 1.41%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [10]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 425
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 750
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,672
1 year rr_AverageAnnualReturnYear01 15.57%
5 years rr_AverageAnnualReturnYear05 4.23%
10 years rr_AverageAnnualReturnYear10 6.25%
Prospectus #3 | Delaware High-Yield Opportunities Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol DHOIX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none [9]
Management fees rr_ManagementFeesOverAssets 0.65%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.26%
Total annual fund operating expenses rr_ExpensesOverAssets 0.91%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [10]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 268
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 482
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,099
1 year rr_AverageAnnualReturnYear01 16.18%
5 years rr_AverageAnnualReturnYear05 4.80%
10 years rr_AverageAnnualReturnYear10 6.78%
[1] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).
[2] “Other expenses” for Class R6 are estimated and account for Class R6 shares not being subject to certain expenses as described further in the section of this Prospectus entitled “Choosing a share class.”
[3] The Fund’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, 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 fund operating expenses from exceeding 0.57% of the Fund’s average daily net assets for all classes other than Class R6, and 0.48% of the Fund’s Class R6 shares’ average daily net assets, from Nov. 27, 2020 through Nov. 27, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[4] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).
[5] “Other expenses” account for Class R6 shares not being subject to certain expenses as described further in the section of the Prospectus entitled “Choosing a share class.”
[6] The Fund’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, 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 fund operating expenses from exceeding 0.57% of the Fund’s average daily net assets for all share classes other than Class R6, and 0.48% of the Fund’s Class R6 shares’ average daily net assets, from Nov. 27, 2020 through Nov. 27, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[7] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).
[8] The Fund’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, 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 fund operating expenses from exceeding 0.69% of the Fund’s average daily net assets from Nov. 27, 2020 through Nov. 27, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[9] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).
[10] The Fund’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, 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 fund operating expenses from exceeding 0.69% of the Fund’s average daily net assets from Nov. 27, 2020 through Nov. 27, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund. Additionally, the Fund’s Class A shares are subject to a blended 12b-1 fee of 0.10% on all shares acquired prior to June 1, 1992, and 0.25% on all shares acquired on or after June 1, 1992. All Class A shares currently bear 12b-1 fees at the same rate, the blended rate based on the formula described above. This method of calculating Class A 12b-1 fees may be discontinued at the sole discretion of the Fund’s Board of Trustees (Board).