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Label Element Value
Risk/Return: dglt_RiskReturn1Abstract  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 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 May 04, 2020
Document Effective Date dei_DocumentEffectiveDate May 04, 2020
Prospectus Date rr_ProspectusDate Apr. 29, 2020
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Delaware Limited-Term Diversified Income Fund  
Risk/Return: dglt_RiskReturn1Abstract  
Risk/Return rr_RiskReturnHeading Delaware Limited-Term Diversified Income Fund
Objective rr_ObjectiveHeading What is the Fund’s investment objective?
Objective, Primary rr_ObjectivePrimaryTextBlock

Delaware Limited-Term Diversified Income Fund seeks maximum total return, consistent with reasonable risk.
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 123% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 123.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the applicable waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in investment grade fixed income securities, including, but not limited to, fixed income securities issued or guaranteed by the US government, its agencies or instrumentalities, and by US corporations (80% policy). Investment grade fixed income securities are securities rated BBB- or higher by Standard & Poor’s Financial Services LLC (S&P) and Baa3 or higher by Moody’s Investors Service, Inc. (Moody’s), or similarly rated by another nationally recognized statistical rating organization (NRSRO), or those that are deemed to be of comparable quality. The Fund will maintain an average effective duration from one to three years. The Fund’s investment manager, Delaware Management Company (Manager), will determine how much of the Fund’s assets to allocate among the different types of fixed income securities in which the Fund may invest based on the Manager’s evaluation of economic and market conditions and its assessment of the returns and potential for appreciation that can be achieved from various sectors of the fixed income market.

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

The corporate debt obligations in which the Fund may invest include bonds, notes, debentures, and commercial paper of US companies and, subject to the limitations described below, non-US companies. The Fund may also invest in a variety of securities that are issued or guaranteed as to the payment of principal and interest by the US government, and by various agencies or instrumentalities, which have been established or are sponsored by the US government, and, subject to the limitations described below, securities issued by foreign governments.

Additionally, the Fund may invest in mortgage-backed securities issued or guaranteed by the US government, its agencies or instrumentalities, government-sponsored corporations, and mortgage-backed securities issued by certain private, nongovernment entities. The Fund may also invest in securities that are backed by assets such as receivables on home equity and credit card loans, automobile, mobile home, recreational vehicle and other loans, wholesale dealer floor plans, and leases.

The Fund may invest up to 20% of its net assets in below-investment-grade securities (also known as high yield or “junk” bonds).

The Fund may also invest up to 30% of its net assets in foreign securities, including up to 10% of its net assets in securities of issuers located in emerging markets. The Fund’s total non-US dollar currency exposure will be limited, in the aggregate, to no more than 10% of its net assets.

The Fund may use a wide range of derivatives instruments, typically including options, futures contracts, options on futures contracts, forward foreign currency contracts, and swaps. The Fund will use derivatives for both hedging and nonhedging purposes. For example, the Fund may invest in: futures and options to manage duration and for defensive purposes, such as to protect gains or hedge against potential losses in the portfolio without actually selling a security, or to stay fully invested; forward foreign currency contracts to manage foreign currency exposure; interest rate swaps to neutralize the impact of interest rate changes; credit default swaps to hedge against a credit event, to gain exposure to certain securities or markets, or to enhance total return; and index swaps to enhance return or to effect diversification. The Fund will not use derivatives for reasons inconsistent with its investment objective and will limit its investments in derivatives instruments to 20% of its net assets.

The Fund’s 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in investment grade fixed income securities, including, but not limited to, fixed income securities issued or guaranteed by the US government, its agencies or instrumentalities, and by US corporations (80% policy).
Risk rr_RiskHeading What are the principal risks of investing in the Fund?
Risk Narrative rr_RiskNarrativeTextBlock

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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

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

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

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

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

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

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

Mortgage-backed and asset-backed securities risk — The risk that the principal on mortgage-backed or asset-backed securities may be prepaid at any time, which will reduce the yield and market value.

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

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

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

LIBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) could have adverse impacts on financial instruments which reference LIBOR. While some instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR could affect the value and liquidity of instruments which reference LIBOR, especially those that do not have fallback provisions.

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

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

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 Limited-Term Diversified Income Fund performed?
Performance Narrative rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps. You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart Heading rr_BarChartHeading Calendar year-by-year total return (Class A)
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Class A’s highest quarterly return was 1.99% for the quarter ended June 30, 2011, and its lowest quarterly return was -2.22% for the quarter ended June 30, 2013. The maximum Class A sales charge of 2.75%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Delaware Limited-Term Diversified Income Fund | Bloomberg Barclays 1-3 Year US Government/Credit Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses, or taxes.
1 Year rr_AverageAnnualReturnYear01 4.03%
5 Years rr_AverageAnnualReturnYear05 1.67%
10 Years rr_AverageAnnualReturnYear10 1.54%
Delaware Limited-Term Diversified Income Fund | Class A  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol DTRIX
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%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.42%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 329
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 532
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 751
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,383
Annual Return 2010 rr_AnnualReturn2010 3.70%
Annual Return 2011 rr_AnnualReturn2011 2.78%
Annual Return 2012 rr_AnnualReturn2012 2.49%
Annual Return 2013 rr_AnnualReturn2013 (1.81%)
Annual Return 2014 rr_AnnualReturn2014 1.28%
Annual Return 2015 rr_AnnualReturn2015 0.62%
Annual Return 2016 rr_AnnualReturn2016 2.42%
Annual Return 2017 rr_AnnualReturn2017 2.11%
Annual Return 2018 rr_AnnualReturn2018 (1.08%)
Annual Return 2019 rr_AnnualReturn2019 4.51%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.99%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.22%)
1 Year rr_AverageAnnualReturnYear01 1.64%
5 Years rr_AverageAnnualReturnYear05 1.14%
10 Years rr_AverageAnnualReturnYear10 1.40%
Delaware Limited-Term Diversified Income Fund | Class A | After Taxes on Distributions  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 0.62%
5 Years rr_AverageAnnualReturnYear05 0.30%
10 Years rr_AverageAnnualReturnYear10 0.61%
Delaware Limited-Term Diversified Income Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 0.96%
5 Years rr_AverageAnnualReturnYear05 0.49%
10 Years rr_AverageAnnualReturnYear10 0.76%
Delaware Limited-Term Diversified Income Fund | Class C  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol DTICX
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [2]
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 1.71%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.32%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 242
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 508
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 898
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,993
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 142
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 508
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 898
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,993
1 Year rr_AverageAnnualReturnYear01 2.63%
5 Years rr_AverageAnnualReturnYear05 0.84%
10 Years rr_AverageAnnualReturnYear10 0.84%
Delaware Limited-Term Diversified Income Fund | Class R  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol DLTRX
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 0.50%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 1.21%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.32%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 91
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 352
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 634
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,438
1 Year rr_AverageAnnualReturnYear01 4.27%
5 Years rr_AverageAnnualReturnYear05 1.37%
10 Years rr_AverageAnnualReturnYear10 1.34%
Delaware Limited-Term Diversified Income Fund | Institutional Class  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol DTINX
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 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 0.71%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.32%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 195
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 363
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 852
1 Year rr_AverageAnnualReturnYear01 4.67%
5 Years rr_AverageAnnualReturnYear05 1.85%
10 Years rr_AverageAnnualReturnYear10 1.85%
Delaware Limited-Term Diversified Income Fund | Class R6  
Risk/Return: dglt_RiskReturn1Abstract  
Trading Symbol dei_TradingSymbol DLTZX
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% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 0.64%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.32%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.32%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 33
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 173
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 325
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 768
1 Year rr_AverageAnnualReturnYear01 4.74%
5 Years rr_AverageAnnualReturnYear05 none
10 years or lifetime rr_AverageAnnualReturnSinceInception 1.88%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2017
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 39% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 39.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the applicable expense waivers and reimbursements for the 2-year contractual period and the total operating expenses without waivers for years 3 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in 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. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

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

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

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

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

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

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

LIBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) could have adverse impacts on financial instruments which reference LIBOR. While some instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR could affect the value and liquidity of instruments which reference LIBOR, especially those that do not have fallback provisions.

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.

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

The bar chart and table below provide some indication of the risks of investing in the Fund. The Fund adopted the performance of the First Investors Tax Exempt Income Fund (Predecessor Fund) as the result of a reorganization of the Predecessor Fund into the Fund, which was consummated after the close of business on Oct. 4, 2019 (Reorganization). The Fund had not yet commenced operations prior to the Reorganization. The bar chart shows changes in performance from year to year and shows how average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.

The returns shown for periods ending on or prior to Oct. 4, 2019 reflect the performance and expenses of the Predecessor Fund. The Predecessor Fund was reorganized into the Fund after the close of business on Oct. 4, 2019. The returns shown for periods after Oct. 4, 2019 reflect the performance and expenses of the Fund.

You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Heading rr_BarChartHeading Calendar year-by-year total return (Class A)
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Class A’s highest quarterly return was 3.70% for the quarter ended Sept. 30, 2011, and its lowest quarterly return was -5.01% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 2.75%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Delaware Tax-Exempt Income Fund | Bloomberg Barclays 3-15 Year Blend Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 6.83% [4]
5 Years rr_AverageAnnualReturnYear05 3.20% [4]
10 Years rr_AverageAnnualReturnYear10 3.93% [4]
Delaware Tax-Exempt Income Fund | Bloomberg Barclays 1-15 Year Municipal Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 6.44% [4]
5 Years rr_AverageAnnualReturnYear05 3.01% [4]
10 Years rr_AverageAnnualReturnYear10 3.66% [4]
Delaware Tax-Exempt Income Fund | ICE Bofa US Municipal Securities Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.74% [4]
5 Years rr_AverageAnnualReturnYear05 3.60% [4]
10 Years rr_AverageAnnualReturnYear10 4.49% [4]
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% [5]
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.90%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 354
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 534
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 740
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,334
Annual Return 2010 rr_AnnualReturn2010 0.71%
Annual Return 2011 rr_AnnualReturn2011 10.32%
Annual Return 2012 rr_AnnualReturn2012 7.23%
Annual Return 2013 rr_AnnualReturn2013 (3.18%)
Annual Return 2014 rr_AnnualReturn2014 8.88%
Annual Return 2015 rr_AnnualReturn2015 2.53%
Annual Return 2016 rr_AnnualReturn2016 0.14%
Annual Return 2017 rr_AnnualReturn2017 3.05%
Annual Return 2018 rr_AnnualReturn2018 0.11%
Annual Return 2019 rr_AnnualReturn2019 6.04%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.70%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.01%)
1 Year rr_AverageAnnualReturnYear01 1.78%
5 Years rr_AverageAnnualReturnYear05 1.51%
10 Years rr_AverageAnnualReturnYear10 3.08%
Delaware Tax-Exempt Income Fund | Class A | After Taxes on Distributions  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 1.78%
5 Years rr_AverageAnnualReturnYear05 1.51%
10 Years rr_AverageAnnualReturnYear10 3.07%
Delaware Tax-Exempt Income Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 2.25%
5 Years rr_AverageAnnualReturnYear05 1.98%
10 Years rr_AverageAnnualReturnYear10 3.25%
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 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.65%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets none [6]
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 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
1 Year rr_AverageAnnualReturnYear01 6.13%
5 Years rr_AverageAnnualReturnYear05 2.62%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.52%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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 0.13% [7]
Total annual fund operating expenses rr_ExpensesOverAssets 0.63%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.01%) [6]
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 200
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 349
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 784
1 Year rr_AverageAnnualReturnYear01 6.38%
5 Years rr_AverageAnnualReturnYear05 2.54%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.51%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 60% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 60.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager’s expense waivers and reimbursements for the 2-year contractual period and the total operating expenses without waivers for years 3 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in 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 & 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. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

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

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

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

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

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

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

LIBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) could have adverse impacts on financial instruments which reference LIBOR. While some instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR could affect the value and liquidity of instruments which reference LIBOR, especially those that do not have fallback provisions.

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.

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

The bar chart and table below provide some indication of the risks of investing in the Fund. The Fund adopted the performance of the First Investors Tax Exempt Opportunities Fund (Predecessor Fund) as the result of a reorganization of the Predecessor Fund into the Fund, which was consummated after the close of business on Oct. 4, 2019 (Reorganization). The Fund had not yet commenced operations prior to the Reorganization. The bar chart shows changes in performance from year to year and shows how average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.

The returns shown for periods ending on or prior to Oct. 4, 2019 reflect the performance and expenses of the Predecessor Fund. The Predecessor Fund was reorganized into the Fund after the close of business on Oct. 4, 2019. The returns shown for periods after Oct. 4, 2019 reflect the performance and expenses of the Fund.

You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Heading rr_BarChartHeading Calendar year-by-year total return (Class A)
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Class A’s highest quarterly return was 4.58% for the quarter ended Sept. 30, 2011, and its lowest quarterly return was -6.04% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Delaware Tax-Exempt Opportunities Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.54% [8]
5 Years rr_AverageAnnualReturnYear05 3.53% [8]
10 Years rr_AverageAnnualReturnYear10 4.34% [8]
Delaware Tax-Exempt Opportunities Fund | ICE Bofa US Municipal Securities Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.74% [8]
5 Years rr_AverageAnnualReturnYear05 3.60% [8]
10 Years rr_AverageAnnualReturnYear10 4.49% [8]
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 4.50%
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 0.19%
Total annual fund operating expenses rr_ExpensesOverAssets 0.99%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%) [9]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 543
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 743
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 965
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,601
Annual Return 2010 rr_AnnualReturn2010 0.67%
Annual Return 2011 rr_AnnualReturn2011 11.76%
Annual Return 2012 rr_AnnualReturn2012 8.92%
Annual Return 2013 rr_AnnualReturn2013 (4.97%)
Annual Return 2014 rr_AnnualReturn2014 11.46%
Annual Return 2015 rr_AnnualReturn2015 3.08%
Annual Return 2016 rr_AnnualReturn2016 0.13%
Annual Return 2017 rr_AnnualReturn2017 3.91%
Annual Return 2018 rr_AnnualReturn2018 (0.44%)
Annual Return 2019 rr_AnnualReturn2019 7.36%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.04%)
1 Year rr_AverageAnnualReturnYear01 3.04%
5 Years rr_AverageAnnualReturnYear05 1.93%
10 Years rr_AverageAnnualReturnYear10 3.63%
Delaware Tax-Exempt Opportunities Fund | Class A | After Taxes on Distributions  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 3.04%
5 Years rr_AverageAnnualReturnYear05 1.93%
10 Years rr_AverageAnnualReturnYear10 3.56%
Delaware Tax-Exempt Opportunities Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 2.93%
5 Years rr_AverageAnnualReturnYear05 2.20%
10 Years rr_AverageAnnualReturnYear10 3.54%
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 0.19%
Total annual fund operating expenses rr_ExpensesOverAssets 0.74%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%) [9]
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 220
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 395
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 903
1 Year rr_AverageAnnualReturnYear01 7.58%
5 Years rr_AverageAnnualReturnYear05 2.97%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.82%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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 0.18% [7]
Total annual fund operating expenses rr_ExpensesOverAssets 0.73%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%) [9]
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 217
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 390
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 891
1 Year rr_AverageAnnualReturnYear01 7.51%
5 Years rr_AverageAnnualReturnYear05 2.88%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.81%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 40% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 40.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager’s expense waivers and reimbursements for the 2-year contractual period and the total operating expenses without waivers for years 3 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in 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. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

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

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

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

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

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

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.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

LIBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) could have adverse impacts on financial instruments which reference LIBOR. While some instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR could affect the value and liquidity of instruments which reference LIBOR, especially those that do not have fallback provisions.

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.

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

The bar chart and table below provide some indication of the risks of investing in the Fund. The Fund adopted the performance of the First Investors California Tax Exempt Fund (Predecessor Fund) as the result of a reorganization of the Predecessor Fund into the Fund, which was consummated after the close of business on Oct. 4, 2019 (Reorganization). The Fund had not yet commenced operations prior to the Reorganization. The bar chart shows changes in performance from year to year and shows how average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.

The returns shown for periods ending on or prior to Oct. 4, 2019 reflect the performance and expenses of the Predecessor Fund. The Predecessor Fund was reorganized into the Fund after the close of business on Oct. 4, 2019. The returns shown for periods after Oct. 4, 2019 reflect the performance and expenses of the Fund.

You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Heading rr_BarChartHeading Calendar year-by-year total return (Class A)
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Class A’s highest quarterly return was 4.06% for the quarter ended Sept. 30, 2011, and its lowest quarterly return was -5.31% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Delaware Tax-Free California II Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.54% [8]
5 Years rr_AverageAnnualReturnYear05 3.53% [8]
10 Years rr_AverageAnnualReturnYear10 4.34% [8]
Delaware Tax-Free California II Fund | ICE Bofa US Municipal Securities Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.74% [8]
5 Years rr_AverageAnnualReturnYear05 3.60% [8]
10 Years rr_AverageAnnualReturnYear10 4.49% [8]
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 4.50%
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 0.41%
Total annual fund operating expenses rr_ExpensesOverAssets 1.21%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.29%) [10]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 540
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 761
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,030
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,799
Annual Return 2010 rr_AnnualReturn2010 0.50%
Annual Return 2011 rr_AnnualReturn2011 10.35%
Annual Return 2012 rr_AnnualReturn2012 8.53%
Annual Return 2013 rr_AnnualReturn2013 (2.91%)
Annual Return 2014 rr_AnnualReturn2014 10.62%
Annual Return 2015 rr_AnnualReturn2015 3.46%
Annual Return 2016 rr_AnnualReturn2016 (0.06%)
Annual Return 2017 rr_AnnualReturn2017 3.78%
Annual Return 2018 rr_AnnualReturn2018 0.24%
Annual Return 2019 rr_AnnualReturn2019 7.52%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.06%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.31%)
1 Year rr_AverageAnnualReturnYear01 3.22%
5 Years rr_AverageAnnualReturnYear05 2.12%
10 Years rr_AverageAnnualReturnYear10 3.68%
Delaware Tax-Free California II Fund | Class A | After Taxes on Distributions  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 3.22%
5 Years rr_AverageAnnualReturnYear05 2.12%
10 Years rr_AverageAnnualReturnYear10 3.68%
Delaware Tax-Free California II Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 2.99%
5 Years rr_AverageAnnualReturnYear05 2.34%
10 Years rr_AverageAnnualReturnYear10 3.63%
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 0.41%
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.32%) [10]
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 240
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 467
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,118
1 Year rr_AverageAnnualReturnYear01 7.73%
5 Years rr_AverageAnnualReturnYear05 3.27%
10 years or lifetime rr_AverageAnnualReturnSinceInception 3.25%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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 0.39% [7]
Total annual fund operating expenses rr_ExpensesOverAssets 0.94%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.29%) [10]
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 240
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 462
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,100
1 Year rr_AverageAnnualReturnYear01 7.73%
5 Years rr_AverageAnnualReturnYear05 3.20%
10 years or lifetime rr_AverageAnnualReturnSinceInception 3.25%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 47% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 47.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager’s expense waivers and reimbursements for the 2-year contractual period and the total operating expenses without waivers for years 3 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, 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. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

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

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

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

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

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.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

LIBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) could have adverse impacts on financial instruments which reference LIBOR. While some instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR could affect the value and liquidity of instruments which reference LIBOR, especially those that do not have fallback provisions.

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.

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

The bar chart and table below provide some indication of the risks of investing in the Fund. The Fund adopted the performance of the First Investors New Jersey Tax Exempt Fund (Predecessor Fund) as the result of a reorganization of the Predecessor Fund into the Fund, which was consummated after the close of business on Oct. 4, 2019 (Reorganization). The Fund had not yet commenced operations prior to the Reorganization. The bar chart shows changes in performance from year to year and shows how average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.

The returns shown for periods ending on or prior to Oct. 4, 2019 reflect the performance and expenses of the Predecessor Fund. The Predecessor Fund was reorganized into the Fund after the close of business on Oct. 4, 2019. The returns shown for periods after Oct. 4, 2019 reflect the performance and expenses of the Fund.

You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Heading rr_BarChartHeading Calendar year-by-year total return (Class A)
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Class A’s highest quarterly return was 4.09% for the quarter ended Sept. 30, 2011, and its lowest quarterly return was -5.03% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Delaware Tax-Free New Jersey Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.54% [8]
5 Years rr_AverageAnnualReturnYear05 3.53% [8]
10 Years rr_AverageAnnualReturnYear10 4.34% [8]
Delaware Tax-Free New Jersey Fund | ICE Bofa US Municipal Securities Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.74% [8]
5 Years rr_AverageAnnualReturnYear05 3.60% [8]
10 Years rr_AverageAnnualReturnYear10 4.49% [8]
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 4.50%
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 0.39%
Total annual fund operating expenses rr_ExpensesOverAssets 1.19%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.29%) [11]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 538
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 755
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,020
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,778
Annual Return 2010 rr_AnnualReturn2010 0.44%
Annual Return 2011 rr_AnnualReturn2011 10.60%
Annual Return 2012 rr_AnnualReturn2012 6.52%
Annual Return 2013 rr_AnnualReturn2013 (4.31%)
Annual Return 2014 rr_AnnualReturn2014 8.78%
Annual Return 2015 rr_AnnualReturn2015 2.16%
Annual Return 2016 rr_AnnualReturn2016 0.61%
Annual Return 2017 rr_AnnualReturn2017 4.13%
Annual Return 2018 rr_AnnualReturn2018 0.29%
Annual Return 2019 rr_AnnualReturn2019 6.68%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.09%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.03%)
1 Year rr_AverageAnnualReturnYear01 2.38%
5 Years rr_AverageAnnualReturnYear05 1.91%
10 Years rr_AverageAnnualReturnYear10 3.08%
Delaware Tax-Free New Jersey Fund | Class A | After Taxes on Distributions  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 2.38%
5 Years rr_AverageAnnualReturnYear05 1.91%
10 Years rr_AverageAnnualReturnYear10 3.08%
Delaware Tax-Free New Jersey Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 2.50%
5 Years rr_AverageAnnualReturnYear05 2.19%
10 Years rr_AverageAnnualReturnYear10 3.17%
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 0.39%
Total annual fund operating expenses rr_ExpensesOverAssets 0.94%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%) [11]
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 246
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 468
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,106
1 Year rr_AverageAnnualReturnYear01 7.00%
5 Years rr_AverageAnnualReturnYear05 3.04%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.64%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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 0.38% [7]
Total annual fund operating expenses rr_ExpensesOverAssets 0.93%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.27%) [11]
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 241
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 460
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,092
1 Year rr_AverageAnnualReturnYear01 7.07%
5 Years rr_AverageAnnualReturnYear05 3.00%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.63%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 27% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 27.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager’s expense waivers and reimbursements for the 2-year contractual period and the total operating expenses without waivers for years 3 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in 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. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

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

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

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

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

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

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.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

LIBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) could have adverse impacts on financial instruments which reference LIBOR. While some instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR could affect the value and liquidity of instruments which reference LIBOR, especially those that do not have fallback provisions.

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.

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

The bar chart and table below provide some indication of the risks of investing in the Fund. The Fund adopted the performance of the First Investors New York Tax Exempt Fund (Predecessor Fund) as the result of a reorganization of the Predecessor Fund into the Fund, which was consummated after the close of business on Oct. 4, 2019 (Reorganization). The Fund had not yet commenced operations prior to the Reorganization. The bar chart shows changes in performance from year to year and shows how average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.

The returns shown for periods ending on or prior to Oct. 4, 2019 reflect the performance and expenses of the Predecessor Fund. The Predecessor Fund was reorganized into the Fund after the close of business on Oct. 4, 2019. The returns shown for periods after Oct. 4, 2019 reflect the performance and expenses of the Fund.

You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Heading rr_BarChartHeading Calendar year-by-year total return (Class A)
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Class A’s highest quarterly return was 3.85% for the quarter ended June 30, 2011, and its lowest quarterly return was -5.11% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Delaware Tax-Free New York II Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.54% [8]
5 Years rr_AverageAnnualReturnYear05 3.53% [8]
10 Years rr_AverageAnnualReturnYear10 4.34% [8]
Delaware Tax-Free New York II Fund | ICE Bofa US Municipal Securities Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.74% [8]
5 Years rr_AverageAnnualReturnYear05 3.60% [8]
10 Years rr_AverageAnnualReturnYear10 4.49% [8]
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 4.50%
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 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.00%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%) [12]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 534
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 727
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 951
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,595
Annual Return 2010 rr_AnnualReturn2010 0.79%
Annual Return 2011 rr_AnnualReturn2011 10.54%
Annual Return 2012 rr_AnnualReturn2012 6.55%
Annual Return 2013 rr_AnnualReturn2013 (3.78%)
Annual Return 2014 rr_AnnualReturn2014 8.96%
Annual Return 2015 rr_AnnualReturn2015 2.76%
Annual Return 2016 rr_AnnualReturn2016 0.22%
Annual Return 2017 rr_AnnualReturn2017 3.27%
Annual Return 2018 rr_AnnualReturn2018 none
Annual Return 2019 rr_AnnualReturn2019 7.42%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.85%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.11%)
1 Year rr_AverageAnnualReturnYear01 3.14%
5 Years rr_AverageAnnualReturnYear05 1.86%
10 Years rr_AverageAnnualReturnYear10 3.16%
Delaware Tax-Free New York II Fund | Class A | After Taxes on Distributions  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 3.14%
5 Years rr_AverageAnnualReturnYear05 1.86%
10 Years rr_AverageAnnualReturnYear10 3.16%
Delaware Tax-Free New York II Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 2.98%
5 Years rr_AverageAnnualReturnYear05 2.18%
10 Years rr_AverageAnnualReturnYear10 3.25%
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 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 0.75%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.15%) [12]
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 209
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 387
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 901
1 Year rr_AverageAnnualReturnYear01 7.68%
5 Years rr_AverageAnnualReturnYear05 3.01%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.74%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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 0.20% [7]
Total annual fund operating expenses rr_ExpensesOverAssets 0.75%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.13%) [12]
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 213
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 391
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 905
1 Year rr_AverageAnnualReturnYear01 7.68%
5 Years rr_AverageAnnualReturnYear05 2.95%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.74%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 50% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 50.00%
Expense Breakpoint Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Funds® by Macquarie.
Expense Breakpoint, Minimum Investment Required rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example rr_ExpenseExampleHeading Example
Expense Example Narrative rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager’s expense waivers and reimbursements for the 2-year contractual period and the total operating expenses without waivers for years 3 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy rr_StrategyHeading What are the Fund’s principal investment strategies?
Strategy Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, 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. An investment in the Fund may not be appropriate for all investors. The Fund’s principal risks include:

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

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance. For example, a tax-exempt security may be reclassified by the Internal Revenue Service or a state tax authority as taxable, and/or future legislative, administrative, or court actions could cause interest from a tax-exempt security to become taxable, possibly retroactively.

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

Call risk — The risk that a bond issuer will prepay the bond during periods of low interest rates, forcing a fund to reinvest that money at interest rates that might be lower than rates on the called bond.

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

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, US territories or possessions (such as the Commonwealth of Puerto Rico, Guam, or the US Virgin Islands), and local political and economic conditions could adversely affect the holdings in and performance of a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state or US territory or possession.

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.

Alternative minimum tax risk — If a fund invests in bonds whose income is subject to the alternative minimum tax, that portion of the fund’s distributions would be taxable for shareholders who are subject to this tax.

LIBOR risk — The risk that potential changes related to the use of the London Interbank Offered Rate (LIBOR) could have adverse impacts on financial instruments which reference LIBOR. While some instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate setting methodology, not all instruments have such fallback provisions and the effectiveness of replacement rates is uncertain. The potential abandonment of LIBOR could affect the value and liquidity of instruments which reference LIBOR, especially those that do not have fallback provisions.

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.

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

The bar chart and table below provide some indication of the risks of investing in the Fund. The Fund adopted the performance of the First Investors Oregon Tax Exempt Fund (Predecessor Fund) as the result of a reorganization of the Predecessor Fund into the Fund, which was consummated after the close of business on Oct. 4, 2019 (Reorganization). The Fund had not yet commenced operations prior to the Reorganization. The bar chart shows changes in performance from year to year and shows how average annual total returns for the 1-, 5-, and 10-year or lifetime periods compare with those of a broad measure of market performance. The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.

The returns shown for periods ending on or prior to Oct. 4, 2019 reflect the performance and expenses of the Predecessor Fund. The Predecessor Fund was reorganized into the Fund after the close of business on Oct. 4, 2019. The returns shown for periods after Oct. 4, 2019 reflect the performance and expenses of the Fund.

You may obtain the Fund’s most recently available month-end performance by calling 800 523-1918 or by visiting our website at delawarefunds.com/performance.
Performance Availability Phone rr_PerformanceAvailabilityPhone 800 523-1918
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress delawarefunds.com/performance
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The past performance shown (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Heading rr_BarChartHeading Calendar year-by-year total return (Class A)
Bar Chart Closing rr_BarChartClosingTextBlock

During the periods illustrated in this bar chart, Class A’s highest quarterly return was 4.21% for the quarter ended Sept. 30, 2010, and its lowest quarterly return was -5.78% for the quarter ended Dec. 31, 2010. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for periods ended December 31, 2019
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).
Performance Table One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is presented only for Class A shares of the Fund.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor’s individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.
Delaware Tax-Free Oregon Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.54% [8]
5 Years rr_AverageAnnualReturnYear05 3.53% [8]
10 Years rr_AverageAnnualReturnYear10 4.34% [8]
Delaware Tax-Free Oregon Fund | ICE Bofa US Municipal Securities Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: dglt_RiskReturn1Abstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes.
1 Year rr_AverageAnnualReturnYear01 7.74% [8]
5 Years rr_AverageAnnualReturnYear05 3.60% [8]
10 Years rr_AverageAnnualReturnYear10 4.49% [8]
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 4.50%
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 0.36%
Total annual fund operating expenses rr_ExpensesOverAssets 1.16%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.25%) [13]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 539
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 753
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,012
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,752
Annual Return 2010 rr_AnnualReturn2010 0.58%
Annual Return 2011 rr_AnnualReturn2011 11.24%
Annual Return 2012 rr_AnnualReturn2012 6.51%
Annual Return 2013 rr_AnnualReturn2013 (5.08%)
Annual Return 2014 rr_AnnualReturn2014 9.06%
Annual Return 2015 rr_AnnualReturn2015 2.39%
Annual Return 2016 rr_AnnualReturn2016 (0.03%)
Annual Return 2017 rr_AnnualReturn2017 3.70%
Annual Return 2018 rr_AnnualReturn2018 (0.04%)
Annual Return 2019 rr_AnnualReturn2019 5.78%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.21%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.78%)
1 Year rr_AverageAnnualReturnYear01 1.57%
5 Years rr_AverageAnnualReturnYear05 1.51%
10 Years rr_AverageAnnualReturnYear10 2.90%
Delaware Tax-Free Oregon Fund | Class A | After Taxes on Distributions  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 1.57%
5 Years rr_AverageAnnualReturnYear05 1.51%
10 Years rr_AverageAnnualReturnYear10 2.89%
Delaware Tax-Free Oregon Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: dglt_RiskReturn1Abstract  
1 Year rr_AverageAnnualReturnYear01 1.95%
5 Years rr_AverageAnnualReturnYear05 1.82%
10 Years rr_AverageAnnualReturnYear10 2.95%
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 0.36%
Total annual fund operating expenses rr_ExpensesOverAssets 0.91%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.25%) [13]
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 239
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 454
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,072
1 Year rr_AverageAnnualReturnYear01 6.03%
5 Years rr_AverageAnnualReturnYear05 2.65%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.27%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
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 0.35% [7]
Total annual fund operating expenses rr_ExpensesOverAssets 0.90%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%) [13]
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 240
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 452
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,064
1 Year rr_AverageAnnualReturnYear01 6.05%
5 Years rr_AverageAnnualReturnYear05 2.59%
10 years or lifetime rr_AverageAnnualReturnSinceInception 2.27%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2013
[1] 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 0.39% of the Fund's average daily net assets from April 29, 2020 through April 30, 2021 for all share classes other than R6, and 0.32% of the Fund's Class R6 shares' average daily net assets from April 29, 2020 through April 30, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund. Additionally, the Fund's distributor, Delaware Distributors, L.P. (Distributor), has contracted to limit the Fund's Class A shares' 12b-1 fees to no more than 0.15% of average daily net assets from April 29, 2020 through April 30, 2021. This waiver may be terminated only by agreement of the Distributor and the Fund.
[2] Class C shares redeemed within one year of purchase are subject to a 1.00% contingent deferred sales charge (CDSC).
[3] "Other expenses" account for Class R6 shares not being subject to certain expenses as described further in the section of the Prospectus entitled "Choosing a share class."
[4] The Fund changed its primary broad-based securities index to the Bloomberg Barclays 3-15 Year Blend Municipal Bond Index as of Oct. 4, 2019. The Fund elected to use the new index because it more closely reflects the Fund's investment strategies.
[5] The Fund's distributor, Delaware Distributors, L.P. (Distributor), has contracted to limit the Class A shares' 12b-1 fees to no more than 0.15% of average daily net assets from Oct. 4, 2019 through Oct. 31, 2021. This waiver may be terminated only by agreement of the Distributor 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 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%, 0.70% and 0.62% of the Fund's average daily net assets for Class A shares, Institutional Class shares and Class R6 shares, respectively, from Oct. 4, 2019 through Oct. 31, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[7] "Other expenses" for Class R6 are estimated and account for Class R6 shares not being subject to certain expenses as described further in the section of this Prospectus entitled "Choosing a share class."
[8] The Fund changed its broad-based securities index to the Bloomberg Barclays Municipal Bond Index as of Oct. 4, 2019. The Fund elected to use the new index because it more closely reflected the Fund's investment strategies.
[9] 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 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 0.95%, 0.66% and 0.65% of the Fund's average daily net assets for Class A shares, Institutional Class and Class R6 shares, respectively, of the Fund's average daily net assets Oct. 4, 2019 through Oct. 31, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[10] The Fund's investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 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, of the Fund's average daily net assets Oct. 4, 2019 through Oct. 31, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[11] 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 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 0.90%, 0.68% and 0.66% of the Fund's average daily net assets for Class A shares, Institutional Class shares and Class R6 shares, respectively, of the Fund's average daily net assets Oct. 4, 2019 through Oct. 31, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[12] 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 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, of the Fund's average daily net assets Oct. 4, 2019 through Oct. 31, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[13] 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 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 0.67% of the Fund's average daily net assets for Class A shares, Institutional Class shares and Class R6 shares, respectively, of the Fund's average daily net assets Oct. 4, 2019 through Oct. 31, 2021. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.