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Label Element Value
Risk/Return: dglt_RiskReturn1Abstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Jul. 19, 2019
Registrant Name dei_EntityRegistrantName DELAWARE GROUP LIMITED-TERM GOVERNMENT FUNDS
Central Index Key dei_EntityCentralIndexKey 0000357059
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 19, 2019
Document Effective Date dei_DocumentEffectiveDate Jul. 19, 2019
Prospectus Date rr_ProspectusDate Jul. 19, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Delaware Tax-Exempt Income Fund  
Risk/Return: dglt_RiskReturn1Abstract  
Risk/Return rr_RiskReturnHeading Delaware Tax-Exempt Income Fund
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Tax-Exempt Income Fund seeks a high level of interest income that is exempt from federal income tax.
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.”
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover Heading rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The 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. Because the Fund commenced operations after the date of this Prospectus, there is no portfolio turnover information available.
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. The example also assumes that your investment has a 5% return each year. 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 securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval (80% policy). However, the Fund typically attempts to invest all of its assets in securities that pay interest that is exempt from federal income tax, but may invest up to 20% of its net assets in securities that pay interest that is subject to the federal alternative minimum tax. The Fund diversifies its assets among municipal bonds and securities of different states, municipalities, and US territories.

The Fund primarily invests in high quality municipal securities that are rated as, or, if unrated, are determined by the Fund’s investment manager, Delaware Management Company (Manager), to be, investment grade at the time of purchase. The Fund may invest in securities insured against default by independent insurance companies and revenue bonds.

To a lesser extent, the Fund may invest in high yield, below investment grade municipal bonds (commonly known as “high yield” or “junk bonds”). High yield bonds include those that are rated below Baa3 by Moody’s Investors Service, Inc. or below BBB- by Standard & Poor’s and unrated bonds that are determined by the Manager to be of equivalent quality. When making investment decisions, the Manager focuses on bonds that it believes can generate attractive and consistent income.

In selecting investments for the Fund, the Manager considers various factors, including: a security’s maturity, coupon, yield, credit quality, call protection and relative value and the outlook for interest rates and the economy. The Manager may sell a security for various reasons, including to replace it with a security that offers a higher yield or better value, respond to a deterioration in credit quality, or raise cash. The Manager generally considers any capital gains or losses that may be incurred upon the sale of an investment. In addition, the Manager considers the duration of the Fund’s portfolio when deciding whether to buy or sell a security.

The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions, but will typically have a dollar-weighted average effective maturity of between 3 and 10 years.
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 securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval (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. The Fund’s principal risks include:

Call risk — When interest rates fall, a callable bond issuer may “call” or repay the security before its stated maturity, and the Fund’s income may decline if it has to reinvest the proceeds at lower interest rates.

Credit risk — An issuer may become unable or unwilling to pay interest or principal when due. The prices of debt securities are affected by the issuer’s credit quality and, for insured securities, the quality of the insurer. A municipal issuer’s ability to pay interest and principal may be adversely affected by factors such as economic, political, regulatory, or legal developments; a credit rating downgrade; or other adverse news. Revenue bonds are subject to the risk that the revenues underpinning the bonds may decline or be insufficient to satisfy the bonds’ obligations.

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 — In general, when interest rates rise, the market values of municipal securities decline, and when interest rates decline, the market values of municipal securities increase. Securities with longer maturities and durations are generally more sensitive to interest rate changes. The Fund typically purchases securities with longer maturities and durations and, therefore, has a high degree of interest rate risk. If interest rates decline, the Fund’s yield may decline and the rates paid on floating rate and variable rate securities will generally decline.

Liquidity risk — Certain investments, such as municipal securities and derivatives, may be difficult or impossible to sell at a favorable time or price, when, for example, the Fund requires liquidity to make redemptions. Market developments may cause the Fund’s investments to become less liquid and subject to erratic price movements. High yield securities tend to be less liquid.

Market risk — The prices of municipal securities may decline in response to certain events, such as general economic and market conditions, adverse political or regulatory developments, and interest rate fluctuations. Adverse market events may lead to increased redemptions, which could cause the Fund to experience a loss or difficulty in selling securities to meet redemptions.

Municipal securities risk — Investments in municipal securities may be negatively affected by political, legal or judicial developments and by economic conditions that threaten the ability of municipalities to raise taxes or otherwise collect revenue.

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.

Tax risk — The Fund may invest in securities that pay taxable interest and/or pay interest that is subject to the federal alternative minimum tax or effect transactions that produce taxable capital gains. Interest on municipal securities may also become subject to income tax due to an adverse legal change or other events.

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 Tax-Exempt Income Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock

There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus. Once available, you may obtain the Fund’s most recently available month-end performance by calling 800 423-4026 or by visiting our website at delawarefunds.com/performance.
Performance One Year or Less rr_PerformanceOneYearOrLess There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 423-4026
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Delaware Tax-Exempt Income Fund | Class A  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FITAX
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
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 651
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 813
Delaware Tax-Exempt Income Fund | Institutional Class  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FITDX
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
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.64%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 65
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 205
Delaware Tax-Exempt Income Fund | Class R6  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FITEX
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
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.11%
Total annual fund operating expenses rr_ExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 195
Delaware Tax-Exempt Opportunities Fund  
Risk/Return: dglt_RiskReturn1Abstract  
Risk/Return rr_RiskReturnHeading Delaware Tax-Exempt Opportunities Fund
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Tax-Exempt Opportunities Fund seeks a high level of interest income that is exempt from federal income tax and, secondarily, 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.”
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover Heading rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The 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. Because the Fund commenced operations after the date of this Prospectus, there is no portfolio turnover information available.
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. 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 3. 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 securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval (80% policy). However, the Fund typically attempts to invest all of its assets in securities that pay interest that is exempt from federal income tax, but may invest up to 20% of its net assets in securities that pay interest that is subject to the federal alternative minimum tax. The Fund diversifies its assets among municipal bonds and securities of different states, municipalities, and US territories.

The Fund primarily invests in high quality municipal securities that are rated as, or, if unrated, are determined by the Manager to be, investment grade at the time of purchase. The Fund may invest in securities insured against default by independent insurance companies and revenue bonds. The Fund also may invest in variable and floating rate securities, as well as interest rate swaps, futures and options on futures to hedge against interest rate changes and inverse floaters to produce income.

To a lesser extent, the Fund may invest in high yield, below investment grade municipal bonds (commonly known as “high yield” or “junk bonds”). High yield bonds include those that are rated below Baa3 by Moody’s Investors Service, Inc. or below BBB- by Standard and Poor’s and unrated bonds that are determined by the Manager to be of equivalent quality. When making investment decisions, the Manager focuses on bonds that it believes can generate attractive and consistent income.

In selecting investments for the Fund, the Manager considers various factors, including: a security’s maturity, coupon, yield, credit quality, call protection and relative value and the outlook for interest rates and the economy. The Manager may sell a security for various reasons, including to replace it with a security that offers a higher yield or better value, respond to a deterioration in credit quality, or raise cash. The Manager generally considers any capital gains or losses that may be incurred upon the sale of an investment. In addition, the Manager considers the duration of the Fund’s portfolio when deciding whether to buy or sell a security.

The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions, but will typically have a dollar-weighted average effective maturity of between 5 and 30 years.
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 securities the income from which is exempt from federal income tax, including the federal alternative minimum tax. This is a fundamental investment policy that may not be changed without prior shareholder approval (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. The Fund’s principal risks include:

Call risk — When interest rates fall, a callable bond issuer may “call” or repay the security before its stated maturity, and the Fund’s income may decline if it has to reinvest the proceeds at lower interest rates.

Credit risk — An issuer may become unable or unwilling to pay interest or principal when due. The prices of debt securities are affected by the issuer’s credit quality and, for insured securities, the quality of the insurer. A municipal issuer’s ability to pay interest and principal may be adversely affected by factors such as economic, political, regulatory, or legal developments; a credit rating downgrade; or other adverse news. Revenue bonds are subject to the risk that the revenues underpinning the bonds may decline or be insufficient to satisfy the bonds’ obligations.

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 — In general, when interest rates rise, the market values of municipal securities decline, and when interest rates decline, the market values of municipal securities increase. Securities with longer maturities and durations are generally more sensitive to interest rate changes. The Fund typically purchases securities with longer maturities and durations and, therefore, has a high degree of interest rate risk. If interest rates decline, the Fund’s yield may decline and the rates paid on floating rate and variable rate securities will generally decline.

Liquidity risk — Certain investments, such as municipal securities and derivatives, may be difficult or impossible to sell at a favorable time or price, when, for example, the Fund requires liquidity to make redemptions. Market developments may cause the Fund’s investments to become less liquid and subject to erratic price movements. High yield securities tend to be less liquid.

Market risk — The prices of municipal securities may decline in response to certain events, such as general economic and market conditions, adverse political or regulatory developments, and interest rate fluctuations. Adverse market events may lead to increased redemptions, which could cause the Fund to experience a loss or difficulty in selling securities to meet redemptions.

Municipal securities risk — Investments in municipal securities may be negatively affected by political, legal or judicial developments and by economic conditions that threaten the ability of municipalities to collect taxes or otherwise collect revenue.

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.

Tax risk — The Fund may invest in securities that pay taxable interest and/or pay interest that is subject to the federal alternative minimum tax or effect transactions that produce taxable capital gains. Interest on municipal securities may also become subject to income tax due to an adverse legal change or other events.

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 Tax-Exempt Opportunities Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock

There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus. Once available, you may obtain the Fund’s most recently available month-end performance by calling 800 423-4026 or by visiting our website at delawarefunds.com/performance.
Performance One Year or Less rr_PerformanceOneYearOrLess There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 423-4026
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Delaware Tax-Exempt Opportunities Fund | Class A  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol EIITX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.18%
Total annual fund operating expenses rr_ExpensesOverAssets 0.98%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 667
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 865
Delaware Tax-Exempt Opportunities Fund | Institutional Class  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol EIIAX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.18%
Total annual fund operating expenses rr_ExpensesOverAssets 0.73%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 233
Delaware Tax-Exempt Opportunities Fund | Class R6  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol EIINX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.13%
Total annual fund operating expenses rr_ExpensesOverAssets 0.68%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 67
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 213
Delaware Tax-Free California II Fund  
Risk/Return: dglt_RiskReturn1Abstract  
Risk/Return rr_RiskReturnHeading Delaware Tax-Free California II Fund
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Tax-Free California II Fund seeks a high level of interest income that is exempt from both federal and state income tax for individual residents of the state of California.
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.”
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover Heading rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The 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. Because the Fund commenced operations after the date of this Prospectus, there is no portfolio turnover information available.
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. 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 3. 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 municipal securities the income from which is exempt from federal income tax, including the federal alternative minimum tax, and from California state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval (80% policy). However, the Fund typically attempts to invest all of its assets in securities that pay interest that is exempt from federal income tax and state income tax for individual residents of such state, but may invest up to 20% of its net assets in securities that pay interest that is subject to the federal alternative minimum tax. Such securities include obligations issued by municipalities and other authorities in California and US possessions and territories. In certain cases, dividends paid by the Fund may also be exempt from local personal income taxes.

The Fund primarily invests in high quality municipal securities that are rated as, or, if unrated, are determined by the Manager to be, investment grade at the time of purchase. The Fund may invest in securities insured against default by independent insurance companies and revenue bonds. The Fund may also invest in variable and floating rate securities, as well as interest rate swaps, futures and options on futures to hedge against interest rate changes and inverse floaters to produce income.

To a lesser extent, the Fund may invest in high yield, below investment grade municipal bonds (commonly known as “high yield” or “junk bonds”). High yield bonds include those that are rated below Baa3 by Moody’s Investors Service, Inc. or below BBB- by Standard & Poor’s and unrated bonds that are determined by the Manager to be of equivalent quality. When making investment decisions, the Manager focuses on bonds that it believes can generate attractive and consistent income.

In selecting investments for the Fund, the Manager considers various factors, including: a security’s maturity, coupon, yield, credit quality, call protection and relative value and the outlook for interest rates and the economy. The Manager may sell a security for various reasons, including to replace it with a security that offers a higher yield or better value, respond to a deterioration in credit quality, or raise cash. The Manager generally considers any capital gains or losses that may be incurred upon the sale of an investment. In addition, the Manager considers the duration of the Fund’s portfolio when deciding whether to buy or sell a security.

The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.
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 municipal securities the income from which is exempt from federal income tax, including the federal alternative minimum tax, and from California state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval (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. The Fund’s principal risks include:

Call risk — When interest rates fall, a callable bond issuer may “call” or repay the security before its stated maturity, and the Fund’s income may decline if it has to reinvest the proceeds at lower interest rates.

Concentration risk — The Fund’s returns will be affected significantly by events that affect California's economy as well as legislative, political and judicial changes in the state. The Fund’s portfolio may be concentrated in a relatively small number of issuers.

Credit risk — An issuer may become unable or unwilling to pay interest or principal when due. The prices of debt securities are affected by the issuer’s credit quality and, for insured securities, the quality of the insurer. A municipal issuer’s ability to pay interest and principal may be adversely affected by factors such as economic, political, regulatory, or legal developments; a credit rating downgrade; or other adverse news. Revenue bonds are subject to the risk that the revenues underpinning the bonds may decline or be insufficient to satisfy the bonds’ obligations.

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 — In general, when interest rates rise, the market values of municipal securities decline, and when interest rates decline, the market values of municipal securities increase. Securities with longer maturities and durations are generally more sensitive to interest rate changes. The Fund typically purchases securities with longer maturities and durations and, therefore, has a high degree of interest rate risk. If interest rates decline, the Fund’s yield may decline and the rates paid on floating rate and variable rate securities will generally decline.

Liquidity risk — Certain investments, such as municipal securities and derivatives, may be difficult or impossible to sell at a favorable time or price, when, for example, the Fund requires liquidity to make redemptions. Market developments may cause the Fund’s investments to become less liquid and subject to erratic price movements. High yield securities tend to be less liquid.

Market risk — The prices of municipal securities may decline in response to certain events, such as general economic and market conditions, adverse political or regulatory developments, and interest rate fluctuations. Adverse market events may lead to increased redemptions, which could cause the Fund to experience a loss or difficulty in selling securities to meet redemptions.

Municipal securities risk — Investments in municipal securities may be negatively affected by political, legal or judicial developments and by economic conditions that threaten the ability of municipalities to collect taxes or otherwise collect revenue.

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.

Tax risk — The Fund may invest in securities that pay taxable interest and/or pay interest that is subject to the federal alternative minimum tax or effect transactions that produce taxable capital gains. Interest on municipal securities may also become subject to income tax due to an adverse legal change or other events.

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 Tax-Free California II Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock

There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus. Once available, you may obtain the Fund’s most recently available month-end performance by calling 800 423-4026 or by visiting our website at delawarefunds.com/performance.
Performance One Year or Less rr_PerformanceOneYearOrLess There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 423-4026
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Delaware Tax-Free California II Fund | Class A  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FICAX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual fund operating expenses rr_ExpensesOverAssets 1.02%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 663
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 862
Delaware Tax-Free California II Fund | Institutional Class  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FICJX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual fund operating expenses rr_ExpensesOverAssets 0.77%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.13%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.64%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 65
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 219
Delaware Tax-Free California II Fund | Class R6  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FICLX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 0.76%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [3]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 220
Delaware Tax-Free New Jersey Fund  
Risk/Return: dglt_RiskReturn1Abstract  
Risk/Return rr_RiskReturnHeading Delaware Tax-Free New Jersey Fund
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Tax-Free New Jersey Fund seeks a high level of interest income that is exempt from both federal and state income tax for individual residents of the state of New Jersey.
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.”
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover Heading rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The 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. Because the Fund commenced operations after the date of this Prospectus, there is no portfolio turnover information available.
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. 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 3. 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, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) will be invested in municipal securities that pay interest that is exempt from federal income tax, including the federal alternative minimum tax, and any applicable state income tax for individual residents of the state of New Jersey (80% policy). However, the Fund typically attempts to invest all of its assets in securities that pay interest that is exempt from federal income tax and state income tax for individual residents of such state, but may invest up to 20% of its net assets in securities that pay interest that is subject to the federal alternative minimum tax. Such securities include obligations issued by municipalities and other authorities in New Jersey and US possessions and territories. In certain cases, dividends paid by the Fund may also be exempt from local personal income taxes.

The Fund primarily invests in high quality municipal securities that are rated as, or, if unrated, are determined by the Manager to be, investment grade at the time of purchase. The Fund may invest in securities insured against default by independent insurance companies and revenue bonds. The Fund may also invest in variable and floating rate securities, as well as interest rate swaps, futures and options on futures to hedge against interest rate changes and inverse floaters to produce income.

To a lesser extent, the Fund may invest in high yield, below investment grade municipal bonds (commonly known as “high yield” or “junk bonds”). High yield bonds include those that are rated below Baa3 by Moody’s Investors Service, Inc. or below BBB- by Standard & Poor’s and unrated bonds that are determined by the Manager to be of equivalent quality. When making investment decisions, the Manager focuses on bonds that it believes can generate attractive and consistent income.

In selecting investments for the Fund, the Manager considers various factors, including: a security’s maturity, coupon, yield, credit quality, call protection and relative value and the outlook for interest rates and the economy. The Manager may sell a security for various reasons, including to replace it with a security that offers a higher yield or better value, respond to a deterioration in credit quality, or raise cash. The Manager generally considers any capital gains or losses that may be incurred upon the sale of an investment. In addition, the Manager considers the duration of the Fund’s portfolio when deciding whether to buy or sell a security.

The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) will be invested in municipal securities that pay interest that is exempt from federal income tax, including the federal alternative minimum tax, and any applicable state income tax for individual residents of the state of New Jersey (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. The Fund’s principal risks include:

Call risk — When interest rates fall, a callable bond issuer may “call” or repay the security before its stated maturity, and the Fund’s income may decline if it has to reinvest the proceeds at lower interest rates.

Concentration risk — The Fund’s returns will be affected significantly by events that affect New Jersey's economy as well as legislative, political and judicial changes in the state. The Fund’s portfolio may be concentrated in a relatively small number of issuers.

Credit risk — An issuer may become unable or unwilling to pay interest or principal when due. The prices of debt securities are affected by the issuer’s credit quality and, for insured securities, the quality of the insurer. A municipal issuer’s ability to pay interest and principal may be adversely affected by factors such as economic, political, regulatory, or legal developments; a credit rating downgrade; or other adverse news. Revenue bonds are subject to the risk that the revenues underpinning the bonds may decline or be insufficient to satisfy the bonds’ obligations.

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 — In general, when interest rates rise, the market values of municipal securities decline, and when interest rates decline, the market values of municipal securities increase. Securities with longer maturities and durations are generally more sensitive to interest rate changes. The Fund typically purchases securities with longer maturities and durations and, therefore, has a high degree of interest rate risk. If interest rates decline, the Fund’s yield may decline and the rates paid on floating rate and variable rate securities will generally decline.

Liquidity risk — Certain investments, such as municipal securities and derivatives, may be difficult or impossible to sell at a favorable time or price, when, for example, the Fund requires liquidity to make redemptions. Market developments may cause the Fund’s investments to become less liquid and subject to erratic price movements. High yield securities tend to be less liquid.

Market risk — The prices of municipal securities may decline in response to certain events, such as general economic and market conditions, adverse political or regulatory developments, and interest rate fluctuations. Adverse market events may lead to increased redemptions, which could cause the Fund to experience a loss or difficulty in selling securities to meet redemptions.

Municipal securities risk — Investments in municipal securities may be negatively affected by political, legal or judicial developments and by economic conditions that threaten the ability of municipalities to collect taxes or otherwise collect revenue.

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.

Tax risk — The Fund may invest in securities that pay taxable interest and/or pay interest that is subject to the federal alternative minimum tax or effect transactions that produce taxable capital gains. Interest on municipal securities may also become subject to income tax due to an adverse legal change or other events.

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 Tax-Free New Jersey Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock

There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus. Once available, you may obtain the Fund’s most recently available month-end performance by calling 800 423-4026 or by visiting our website at delawarefunds.com/performance.
Performance One Year or Less rr_PerformanceOneYearOrLess There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 423-4026
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Delaware Tax-Free New Jersey Fund | Class A  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FINJX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual fund operating expenses rr_ExpensesOverAssets 1.02%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.12%) [4]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 858
Delaware Tax-Free New Jersey Fund | Institutional Class  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FINLX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual fund operating expenses rr_ExpensesOverAssets 0.77%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [4]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 69
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 228
Delaware Tax-Free New Jersey Fund | Class R6  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FINNX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 0.79%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.12%) [4]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 228
Delaware Tax-Free New York II Fund  
Risk/Return: dglt_RiskReturn1Abstract  
Risk/Return rr_RiskReturnHeading Delaware Tax-Free New York II Fund
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Tax-Free New York II Fund seeks a high level of interest income that is exempt from both federal and state income tax for individual residents of the state of New York.
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.”
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover Heading rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The 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. Because the Fund commenced operations after the date of this Prospectus, there is no portfolio turnover information available.
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. 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 3. 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 municipal securities the income from which is exempt from federal income tax, including the federal alternative minimum tax, and from New York state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval (80% policy). However, the Fund typically attempts to invest all of its assets in securities that pay interest that is exempt from federal income tax and state income tax for individual residents of such state, but may invest up to 20% of its net assets in securities that pay interest that is subject to the federal alternative minimum tax. Such securities include obligations issued by municipalities and other authorities in New York and US possessions and territories. In certain cases, dividends paid by the Fund may also be exempt from local personal income taxes.

The Fund primarily invests in high quality municipal securities that are rated as, or, if unrated, are determined by the Manager to be, investment grade at the time of purchase. The Fund may invest in securities insured against default by independent insurance companies and revenue bonds. The Fund may also invest in variable and floating rate securities, as well as interest rate swaps, futures and options on futures to hedge against interest rate changes and inverse floaters to produce income.

To a lesser extent, the Fund may invest in high yield, below investment grade municipal bonds (commonly known as “high yield” or “junk bonds”). High yield bonds include those that are rated below Baa3 by Moody’s Investors Service, Inc. or below BBB- by Standard & Poor’s and unrated bonds that are determined by the Manager to be of equivalent quality. When making investment decisions, the Manager focuses on bonds that it believes can generate attractive and consistent income.

In selecting investments for the Fund, the Manager considers various factors, including: a security’s maturity, coupon, yield, credit quality, call protection and relative value and the outlook for interest rates and the economy. The Manager may sell a security for various reasons, including to replace it with a security that offers a higher yield or better value, respond to a deterioration in credit quality, or raise cash. The Manager generally considers any capital gains or losses that may be incurred upon the sale of an investment. In addition, the Manager considers the duration of the Fund’s portfolio when deciding whether to buy or sell a security.

The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.
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 municipal securities the income from which is exempt from federal income tax, including the federal alternative minimum tax, and from New York state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval (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. The Fund’s principal risks include:

Call risk — When interest rates fall, a callable bond issuer may “call” or repay the security before its stated maturity, and the Fund’s income may decline if it has to reinvest the proceeds at lower interest rates.

Concentration risk — The Fund’s returns will be affected significantly by events that affect New York's economy as well as legislative, political and judicial changes in the state. The Fund’s portfolio may be concentrated in a relatively small number of issuers.

Credit risk — An issuer may become unable or unwilling to pay interest or principal when due. The prices of debt securities are affected by the issuer’s credit quality and, for insured securities, the quality of the insurer. A municipal issuer’s ability to pay interest and principal may be adversely affected by factors such as economic, political, regulatory, or legal developments; a credit rating downgrade; or other adverse news. Revenue bonds are subject to the risk that the revenues underpinning the bonds may decline or be insufficient to satisfy the bonds’ obligations.

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 — In general, when interest rates rise, the market values of municipal securities decline, and when interest rates decline, the market values of municipal securities increase. Securities with longer maturities and durations are generally more sensitive to interest rate changes. The Fund typically purchases securities with longer maturities and durations and, therefore, has a high degree of interest rate risk. If interest rates decline, the Fund’s yield may decline and the rates paid on floating rate and variable rate securities will generally decline.

Liquidity risk — Certain investments, such as municipal securities and derivatives, may be difficult or impossible to sell at a favorable time or price, when, for example, the Fund requires liquidity to make redemptions. Market developments may cause the Fund’s investments to become less liquid and subject to erratic price movements. High yield securities tend to be less liquid.

Market risk — The prices of municipal securities may decline in response to certain events, such as general economic and market conditions, adverse political or regulatory developments, and interest rate fluctuations. Adverse market events may lead to increased redemptions, which could cause the Fund to experience a loss or difficulty in selling securities to meet redemptions.

Municipal securities risk — Investments in municipal securities may be negatively affected by political, legal or judicial developments and by economic conditions that threaten the ability of municipalities to collect taxes or otherwise collect revenue.

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.

Tax risk — The Fund may invest in securities that pay taxable interest and/or pay interest that is subject to the federal alternative minimum tax or effect transactions that produce taxable capital gains. Interest on municipal securities may also become subject to income tax due to an adverse legal change or other events.

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 Tax-Free New York II Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock

There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus. Once available, you may obtain the Fund’s most recently available month-end performance by calling 800 423-4026 or by visiting our website at delawarefunds.com/performance.
Performance One Year or Less rr_PerformanceOneYearOrLess There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 423-4026
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Delaware Tax-Free New York II Fund | Class A  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FNYFX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.94%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%) [5]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 658
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 842
Delaware Tax-Free New York II Fund | Institutional Class  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FNYHX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.69%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [5]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.60%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 202
Delaware Tax-Free New York II Fund | Class R6  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FNYJX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.70%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%) [5]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 63
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 207
Delaware Tax-Free Oregon Fund  
Risk/Return: dglt_RiskReturn1Abstract  
Risk/Return rr_RiskReturnHeading Delaware Tax-Free Oregon Fund
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Tax-Free Oregon Fund seeks a high level of interest income that is exempt from both federal and state income tax for individual residents of the state of Oregon.
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.”
Shareholder Fees Caption rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover Heading rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The 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. Because the Fund commenced operations after the date of this Prospectus, there is no portfolio turnover information available.
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. 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 3. 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, at least 80% of the Fund's net assets (plus any borrowings for investment purposes) will be invested in municipal securities that pay interest that is exempt from federal income tax, including the federal alternative minimum tax, and any applicable state income tax for individual residents of the state of Oregon (80% policy). However, the Fund typically attempts to invest all of its assets in securities that pay interest that is exempt from federal income tax and state income tax for individual residents of such state, but may invest up to 20% of its net assets in securities that pay interest that is subject to the federal alternative minimum tax. Such securities include obligations issued by municipalities and other authorities in Oregon and US possessions and territories. In certain cases, dividends paid by the Fund may also be exempt from local personal income taxes.

The Fund primarily invests in high quality municipal securities that are rated as, or, if unrated, are determined by the Manager to be, investment grade at the time of purchase. The Fund may invest in securities insured against default by independent insurance companies and revenue bonds. The Fund may also invest in variable and floating rate securities, as well as interest rate swaps, futures and options on futures to hedge against interest rate changes and inverse floaters to produce income.

To a lesser extent, the Fund may invest in high yield, below investment grade municipal bonds (commonly known as “high yield” or “junk bonds”). High yield bonds include those that are rated below Baa3 by Moody’s Investors Service, Inc. or below BBB- by Standard & Poor’s and unrated bonds that are determined by the Manager to be of equivalent quality. When making investment decisions, the Manager focuses on bonds that it believes can generate attractive and consistent income.

In selecting investments for the Fund, the Manager considers various factors, including: a security’s maturity, coupon, yield, credit quality, call protection and relative value and the outlook for interest rates and the economy. The Manager may sell a security for various reasons, including to replace it with a security that offers a higher yield or better value, respond to a deterioration in credit quality, or raise cash. The Manager generally considers any capital gains or losses that may be incurred upon the sale of an investment. In addition, the Manager considers the duration of the Fund’s portfolio when deciding whether to buy or sell a security.

The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, at least 80% of the Fund's net assets (plus any borrowings for investment purposes) will be invested in municipal securities that pay interest that is exempt from federal income tax, including the federal alternative minimum tax, and any applicable state income tax for individual residents of the state of Oregon (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. The Fund’s principal risks include:

Call risk — When interest rates fall, a callable bond issuer may “call” or repay the security before its stated maturity, and the Fund’s income may decline if it has to reinvest the proceeds at lower interest rates.

Concentration risk — The Fund’s returns will be affected significantly by events that affect Oregon's economy as well as legislative, political and judicial changes in the state. The Fund’s portfolio may be concentrated in a relatively small number of issuers.

Credit risk — An issuer may become unable or unwilling to pay interest or principal when due. The prices of debt securities are affected by the issuer’s credit quality and, for insured securities, the quality of the insurer. A municipal issuer’s ability to pay interest and principal may be adversely affected by factors such as economic, political, regulatory, or legal developments; a credit rating downgrade; or other adverse news. Revenue bonds are subject to the risk that the revenues underpinning the bonds may decline or be insufficient to satisfy the bonds’ obligations.

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 — In general, when interest rates rise, the market values of municipal securities decline, and when interest rates decline, the market values of municipal securities increase. Securities with longer maturities and durations are generally more sensitive to interest rate changes. The Fund typically purchases securities with longer maturities and durations and, therefore, has a high degree of interest rate risk. If interest rates decline, the Fund’s yield may decline and the rates paid on floating rate and variable rate securities will generally decline.

Liquidity risk — Certain investments, such as municipal securities and derivatives, may be difficult or impossible to sell at a favorable time or price, when, for example, the Fund requires liquidity to make redemptions. Market developments may cause the Fund’s investments to become less liquid and subject to erratic price movements. High yield securities tend to be less liquid.

Market risk — The prices of municipal securities may decline in response to certain events, such as general economic and market conditions, adverse political or regulatory developments, and interest rate fluctuations. Adverse market events may lead to increased redemptions, which could cause the Fund to experience a loss or difficulty in selling securities to meet redemptions.

Municipal securities risk — Investments in municipal securities may be negatively affected by political, legal or judicial developments and by economic conditions that threaten the ability of municipalities to collect taxes or otherwise collect revenue.

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.

Tax risk — The Fund may invest in securities that pay taxable interest and/or pay interest that is subject to the federal alternative minimum tax or effect transactions that produce taxable capital gains. Interest on municipal securities may also become subject to income tax due to an adverse legal change or other events.

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 Tax-Free Oregon Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock

There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus. Once available, you may obtain the Fund’s most recently available month-end performance by calling 800 423-4026 or by visiting our website at delawarefunds.com/performance.
Performance One Year or Less rr_PerformanceOneYearOrLess There is no performance information for the Fund because the Fund had not yet commenced operations as of the date of this Prospectus.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 423-4026
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Delaware Tax-Free Oregon Fund | Class A  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FTORX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual fund operating expenses rr_ExpensesOverAssets 1.02%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 663
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 860
Delaware Tax-Free Oregon Fund | Institutional Class  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FTOTX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual fund operating expenses rr_ExpensesOverAssets 0.77%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 67
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 223
Delaware Tax-Free Oregon Fund | Class R6  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol FTOUX
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
Management fees rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.25%
Total annual fund operating expenses rr_ExpensesOverAssets 0.80%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%) [6]
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 $ 233
[1] The Fund's distributor, Delaware Distributors, L.P. (Distributor), has also contracted to limit the Class A shares' 12b-1 fees from July 19, 2019 through October 31, 2020, to no more than 0.15% of average daily net assets.
[2] 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 0.96% and 0.66% of the Fund's average daily net assets for Class A shares and Class R6 shares, respectively, from July 19, 2019 through October 4, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[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 0.92%, 0.64% and 0.65% of the Fund's average daily net assets for Class A shares. Institutional Class shares and Class R6 shares, respectively, from July 19, 2019 through October 4, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[4] 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 0.92%, 0.68% and 0.67% of the Fund's average daily net assets for Class A shares, Institutional Class shares and Class R6 shares, respectively, from July 19, 2019 through October 4, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[5] 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 0.86%, 0.60% and 0.62% of the Fund's average daily net assets for Class A shares. Institutional Class shares and Class R6 shares, respectively, from July 19, 2019 through October 4, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[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 0.91%, 0.66% and 0.69% of the Fund's average daily net assets for Class A shares, Institutional Class shares and Class R6 shares, respectively, from July 19, 2019 through October 4, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.