485BPOS

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

FORM N-1A

File No. 033-63238
File No. 811-07742

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		/X/
	Pre-Effective Amendment No. _______	/   /
	Post-Effective Amendment No.        44	/X/
		and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		/X/
	Amendment No.        45

(Check appropriate box or boxes.)

VOYAGEUR MUTUAL FUNDS
(Exact Name of Registrant as Specified in Charter)
2005 Market Street, Philadelphia, Pennsylvania	19103-7094
(Address of Principal Executive Offices)	(Zip Code)
Registrant’s Telephone Number, including Area Code:		(800) 523-1918
David F. Connor, Esq., 2005 Market Street, Philadelphia, PA 19103-7094
(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):
/X/	immediately upon filing pursuant to paragraph (b)
/   /	on (date) pursuant to paragraph (b)
/   /	60 days after filing pursuant to paragraph (a)(1)
/   /	on (date) pursuant to paragraph (a)(1)
/   /	75 days after filing pursuant to paragraph (a)(2)
/   /	on (date) pursuant to paragraph (a)(2) of Rule 485.
If appropriate, check the following box:
/   /	this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Philadelphia and Commonwealth of Pennsylvania on this 22nd day of January, 2013.

VOYAGEUR MUTUAL FUNDS
By:	/s/ Patrick P. Coyne
	Patrick P. Coyne
	Chairman/President/Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

Signature		Title	Date
/s/ Patrick P. Coyne		Chairman/President/Chief Executive Officer	January 22, 2013
Patrick P. Coyne		(Principal Executive Officer) and Trustee
Thomas L. Bennett	*	Trustee	January 22, 2013
Thomas L. Bennett
		Trustee
Joseph W. Chow
John A. Fry	*	Trustee	January 22, 2013
John A. Fry
Anthony D. Knerr	*	Trustee	January 22, 2013
Anthony D. Knerr
Lucinda S. Landreth	*	Trustee	January 22, 2013
Lucinda S. Landreth
Frances A. Sevilla-Sacasa	*	Trustee	January 22, 2013
Frances A. Sevilla-Sacasa
		Trustee
Thomas K. Whitford
Janet L. Yeomans	*	Trustee	January 22, 2013
Janet L. Yeomans
J. Richard Zecher	*	Trustee	January 22, 2013
J. Richard Zecher
Richard Salus	*	Senior Vice President/Chief Financial Officer	January 22, 2013
Richard Salus		(Principal Financial Officer)

*By:	/s/ Patrick P. Coyne
	Patrick P. Coyne
	as Attorney-in-Fact for each of the persons indicated
	(Pursuant to Powers of Attorney previously filed)

INDEX TO EXHIBITS
(Voyageur Mutual Funds N-1A)

Exhibit No.	Exhibit
EX-1-101.INS	XBRL Instance Document
EX-1-101.SCH	XBRL Taxonomy Extension Schema Document
EX-1-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-1-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-1-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

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(Delaware National High-Yield Municipal Bond Fund)

What is the Fund's investment objective?

Delaware National High-Yield Municipal Bond Fund seeks a high level of current income exempt from federal income tax primarily through investment in medium- and lower-grade municipal obligations.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware National High-Yield Municipal Bond Fund)	Class A	Class B		Class C		Institutional Class
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware National High-Yield Municipal Bond Fund)		Class A	Class B	Class C	Institutional Class
Management fees		0.55%	0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%	none
Other expenses		0.19%	0.19%	0.19%	0.19%
Total annual fund operating expenses		0.99%	1.74%	1.74%	0.74%
Fee waivers and expense reimbursements	[1]	(0.14%)	(0.14%)	(0.14%)	(0.14%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.85%	1.60%	1.60%	0.60%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware National High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	533	738	959	1,596
Class B	563	759	1,081	1,842
Class C	263	534	931	2,040
Institutional Class	61	222	398	905

Expense Example, No Redemption (Delaware National High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	163	534	931	1,842
Class C	163	534	931	2,040

Portfolio turnover

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 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 34% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval. Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. 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 between 5 and 30 years. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. Under normal circumstances, the Fund will invest primarily in lower-rated municipal securities, which typically offer higher income potential and involve greater risk than higher-quality securities.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware National High-Yield Municipal Bond Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

^[1]

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 13.32%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 14.79% for the quarter ended September 30, 2009, and its lowest quarterly return was -14.15% for the quarter ended December 31, 2008. 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 returns in the table below do include the sales charge.

Average annual total returns for periods ended December 31, 2011

^[1]

Average Annual Total Returns (Delaware National High-Yield Municipal Bond Fund)	Label	1 Year	5 Years	10 Years	Lifetime
Class A		5.46%	3.27%	4.69%
Class A return after taxes on distributions		5.46%	3.27%	4.69%
Class A return after taxes on distributions and sale of Fund shares		5.29%	3.49%	4.73%
Class B		5.58%	3.17%	4.52%
Class C		8.56%	3.44%	4.39%
Institutional Class	(lifetime: 12/31/08-12/31/11)	10.62%			15.65%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)		10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.60% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] Because the Fund has combined its retail and institutional prospectuses, the bar chart and the after tax returns in the average annual total returns table show the performance of the Fund's Class A shares.

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Annual Fund Operating Expenses (dei_DocumentInformationDocumentAxis)	0 Months Ended
	Dec. 28, 2012
(Delaware National High-Yield Municipal Bond Fund) | Class A
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	0.25%
Other expenses	0.19%
Total annual fund operating expenses	0.99%
Fee waivers and expense reimbursements	(0.14%)	[1]
Total annual fund operating expenses after fee waivers and expense reimbursements	0.85%
(Delaware National High-Yield Municipal Bond Fund) | Class B
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.19%
Total annual fund operating expenses	1.74%
Fee waivers and expense reimbursements	(0.14%)	[1]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.60%
(Delaware National High-Yield Municipal Bond Fund) | Class C
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.19%
Total annual fund operating expenses	1.74%
Fee waivers and expense reimbursements	(0.14%)	[1]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.60%
(Delaware National High-Yield Municipal Bond Fund) | Institutional Class
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	none
Other expenses	0.19%
Total annual fund operating expenses	0.74%
Fee waivers and expense reimbursements	(0.14%)	[1]
Total annual fund operating expenses after fee waivers and expense reimbursements	0.60%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	0.25%
Other expenses	0.17%
Total annual fund operating expenses	0.97%
Fee waivers and expense reimbursements	(0.08%)	[2]
Total annual fund operating expenses after fee waivers and expense reimbursements	0.89%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class B
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.17%
Total annual fund operating expenses	1.72%
Fee waivers and expense reimbursements	(0.08%)	[2]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.64%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class C
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.17%
Total annual fund operating expenses	1.72%
Fee waivers and expense reimbursements	(0.08%)	[2]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.64%
(Delaware Tax-Free California Fund) | Class A
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	0.25%
Other expenses	0.17%
Total annual fund operating expenses	0.97%
Fee waivers and expense reimbursements	(0.15%)	[3]
Total annual fund operating expenses after fee waivers and expense reimbursements	0.82%
(Delaware Tax-Free California Fund) | Class B
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.17%
Total annual fund operating expenses	1.72%
Fee waivers and expense reimbursements	(0.15%)	[3]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.57%
(Delaware Tax-Free California Fund) | Class C
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.17%
Total annual fund operating expenses	1.72%
Fee waivers and expense reimbursements	(0.15%)	[3]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.57%
(Delaware Tax-Free Idaho Fund) | Class A
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	0.25%
Other expenses	0.14%
Total annual fund operating expenses	0.94%
Fee waivers and expense reimbursements	(0.06%)	[4]
Total annual fund operating expenses after fee waivers and expense reimbursements	0.88%
(Delaware Tax-Free Idaho Fund) | Class B
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.14%
Total annual fund operating expenses	1.69%
Fee waivers and expense reimbursements	(0.06%)	[4]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.63%
(Delaware Tax-Free Idaho Fund) | Class C
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.14%
Total annual fund operating expenses	1.69%
Fee waivers and expense reimbursements	(0.06%)	[4]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.63%
(Delaware Tax-Free New York Fund) | Class A
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	0.25%
Other expenses	0.21%
Total annual fund operating expenses	1.01%
Fee waivers and expense reimbursements	(0.21%)	[5]
Total annual fund operating expenses after fee waivers and expense reimbursements	0.80%
(Delaware Tax-Free New York Fund) | Class B
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.21%
Total annual fund operating expenses	1.76%
Fee waivers and expense reimbursements	(0.21%)	[5]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.55%
(Delaware Tax-Free New York Fund) | Class C
Operating Expenses:
Management fees	0.55%
Distribution and service (12b-1) fees	1.00%
Other expenses	0.21%
Total annual fund operating expenses	1.76%
Fee waivers and expense reimbursements	(0.21%)	[5]
Total annual fund operating expenses after fee waivers and expense reimbursements	1.55%

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.60% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[2] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.64% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[3] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.57% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[4] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.63% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[5] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.55% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

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(Delaware Minnesota High-Yield Municipal Bond Fund)

What is the Fund's investment objective?

Delaware Minnesota High-Yield Municipal Bond Fund seeks a high level of current income that is exempt from federal income tax and from Minnesota state personal income taxes, primarily through investment in medium- and lower-grade municipal obligations.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Minnesota High-Yield Municipal Bond Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Minnesota High-Yield Municipal Bond Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.17%	0.17%	0.17%
Total annual fund operating expenses		0.97%	1.72%	1.72%
Fee waivers and expense reimbursements	[1]	(0.08%)	(0.08%)	(0.08%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.89%	1.64%	1.64%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Minnesota High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	537	737	955	1,579
Class B	567	759	1,076	1,825
Class C	267	534	926	2,024

Expense Example, No Redemption (Delaware Minnesota High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	167	534	926	1,825
Class C	167	534	926	2,024

Portfolio turnover

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 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 13% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, including the federal alternative minimum tax, and from Minnesota state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval.

The Fund is required to derive at least 95% of its income from Minnesota obligations in order for any of its income to be exempt from Minnesota state personal income taxes. Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. Under normal circumstances, the Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

The Fund will invest in lower-rated municipal securities ("junk bonds"), which typically offer higher income potential and involve greater risk than higher-quality securities.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Minnesota High-Yield Municipal Bond Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 7.11%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 9.03% for the quarter ended September 30, 2009 and its lowest quarterly return was -6.04% for the quarter ended December 31, 2008. 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Minnesota High-Yield Municipal Bond Fund)	1 Year	5 Years	10 Years
Class A	5.69%	3.42%	5.16%
Class A return after taxes on distributions	5.69%	3.42%	5.16%
Class A return after taxes on distributions and sale of Fund shares	5.14%	3.49%	5.08%
Class B	5.81%	3.34%	5.01%
Class C	8.80%	3.59%	4.87%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free California Fund)

What is the Fund's investment objective?

Delaware Tax-Free California Fund seeks as high a level of current income exempt from federal income tax and from the California state personal income tax as is consistent with preservation of capital.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Tax-Free California Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Tax-Free California Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.17%	0.17%	0.17%
Total annual fund operating expenses		0.97%	1.72%	1.72%
Fee waivers and expense reimbursements	[1]	(0.15%)	(0.15%)	(0.15%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.82%	1.57%	1.57%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Tax-Free California Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	530	731	948	1,573
Class B	560	752	1,069	1,819
Class C	260	527	919	2,018

Expense Example, No Redemption (Delaware Tax-Free California Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	160	527	919	1,819
Class C	160	527	919	2,018

Portfolio turnover

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 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 32% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, 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.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

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

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Tax-Free California Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 10.23%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 12.14% for the quarter ended September 30, 2009 and its lowest quarterly return was -5.79% for the quarter ended December 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Tax-Free California Fund)	1 Year	5 Years	10 Years
Class A	6.24%	3.42%	4.75%
Class A return after taxes on distributions	6.24%	3.42%	4.75%
Class A return after taxes on distributions and sale of Fund shares	5.55%	3.50%	4.69%
Class B	6.42%	3.33%	4.59%
Class C	9.44%	3.59%	4.44%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free Idaho Fund)

What is the Fund's investment objective?

Delaware Tax-Free Idaho Fund seeks as high a level of current income exempt from federal income tax and from Idaho personal income taxes as is consistent with preservation of capital.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Tax-Free Idaho Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Tax-Free Idaho Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.14%	0.14%	0.14%
Total annual fund operating expenses		0.94%	1.69%	1.69%
Fee waivers and expense reimbursements	[1]	(0.06%)	(0.06%)	(0.06%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.88%	1.63%	1.63%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Tax-Free Idaho Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	536	730	941	1,548
Class B	566	752	1,062	1,793
Class C	266	527	912	1,993

Expense Example, No Redemption (Delaware Tax-Free Idaho Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	166	527	912	1,793
Class C	166	527	912	1,993

Portfolio turnover

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 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 17% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, including the federal alternative minimum tax, and from Idaho state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Tax-Free Idaho Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 5.51%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 7.07% for the quarter ended September 30, 2009 and its lowest quarterly return was -4.60% for the quarter ended December 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Tax-Free Idaho Fund)	1 Year	5 Years	10 Years
Class A	3.48%	3.69%	4.45%
Class A return after taxes on distributions	3.48%	3.69%	4.45%
Class A return after taxes on distributions and sale of Fund shares	3.56%	3.69%	4.39%
Class B	3.58%	3.60%	4.30%
Class C	6.58%	3.85%	4.16%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free New York Fund)

What is the Fund's investment objective?

Delaware Tax-Free New York Fund seeks as high a level of current income exempt from federal income tax and from New York state personal income taxes as is consistent with preservation of capital.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Tax-Free New York Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Tax-Free New York Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.21%	0.21%	0.21%
Total annual fund operating expenses		1.01%	1.76%	1.76%
Fee waivers and expense reimbursements	[1]	(0.21%)	(0.21%)	(0.21%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.80%	1.55%	1.55%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Tax-Free New York Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	528	737	963	1,612
Class B	558	759	1,085	1,857
Class C	258	534	935	2,056

Expense Example, No Redemption (Delaware Tax-Free New York Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	158	534	935	1,857
Class C	158	534	935	2,056

Portfolio turnover

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 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 28% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, 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.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Tax-Free New York Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 8.93%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 8.61% for the quarter ended September 30, 2009 and its lowest quarterly return was -5.10% for the quarter ended December 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Tax-Free New York Fund)	1 Year	5 Years	10 Years
Class A	5.04%	3.96%	4.96%
Class A return after taxes on distributions	5.04%	3.96%	4.96%
Class A return after taxes on distributions and sale of Fund shares	4.60%	3.94%	4.87%
Class B	5.16%	3.89%	4.82%
Class C	8.16%	4.15%	4.67%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.64% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.57% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.63% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.55% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

XML

Average Annual Total Returns (dei_DocumentInformationDocumentAxis)	0 Months Ended
	Dec. 28, 2012
(Delaware National High-Yield Municipal Bond Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Return:
1 Year	10.70%
5 Years	5.22%
10 Years	5.38%
(Delaware National High-Yield Municipal Bond Fund) | Class A
Average Annual Return:
1 Year	5.46%
5 Years	3.27%
10 Years	4.69%
(Delaware National High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions
Average Annual Return:
1 Year	5.46%
5 Years	3.27%
10 Years	4.69%
(Delaware National High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions and sale of Fund shares
Average Annual Return:
1 Year	5.29%
5 Years	3.49%
10 Years	4.73%
(Delaware National High-Yield Municipal Bond Fund) | Class B
Average Annual Return:
1 Year	5.58%
5 Years	3.17%
10 Years	4.52%
(Delaware National High-Yield Municipal Bond Fund) | Class C
Average Annual Return:
1 Year	8.56%
5 Years	3.44%
10 Years	4.39%
(Delaware National High-Yield Municipal Bond Fund) | Institutional Class
Average Annual Return:
Label	(lifetime: 12/31/08-12/31/11)
1 Year	10.62%
5 Years
Lifetime	15.65%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Return:
1 Year	10.70%
5 Years	5.22%
10 Years	5.38%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A
Average Annual Return:
1 Year	5.69%
5 Years	3.42%
10 Years	5.16%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions
Average Annual Return:
1 Year	5.69%
5 Years	3.42%
10 Years	5.16%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions and sale of Fund shares
Average Annual Return:
1 Year	5.14%
5 Years	3.49%
10 Years	5.08%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class B
Average Annual Return:
1 Year	5.81%
5 Years	3.34%
10 Years	5.01%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class C
Average Annual Return:
1 Year	8.80%
5 Years	3.59%
10 Years	4.87%
(Delaware Tax-Free California Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Return:
1 Year	10.70%
5 Years	5.22%
10 Years	5.38%
(Delaware Tax-Free California Fund) | Class A
Average Annual Return:
1 Year	6.24%
5 Years	3.42%
10 Years	4.75%
(Delaware Tax-Free California Fund) | Class A | return after taxes on distributions
Average Annual Return:
1 Year	6.24%
5 Years	3.42%
10 Years	4.75%
(Delaware Tax-Free California Fund) | Class A | return after taxes on distributions and sale of Fund shares
Average Annual Return:
1 Year	5.55%
5 Years	3.50%
10 Years	4.69%
(Delaware Tax-Free California Fund) | Class B
Average Annual Return:
1 Year	6.42%
5 Years	3.33%
10 Years	4.59%
(Delaware Tax-Free California Fund) | Class C
Average Annual Return:
1 Year	9.44%
5 Years	3.59%
10 Years	4.44%
(Delaware Tax-Free Idaho Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Return:
1 Year	10.70%
5 Years	5.22%
10 Years	5.38%
(Delaware Tax-Free Idaho Fund) | Class A
Average Annual Return:
1 Year	3.48%
5 Years	3.69%
10 Years	4.45%
(Delaware Tax-Free Idaho Fund) | Class A | return after taxes on distributions
Average Annual Return:
1 Year	3.48%
5 Years	3.69%
10 Years	4.45%
(Delaware Tax-Free Idaho Fund) | Class A | return after taxes on distributions and sale of Fund shares
Average Annual Return:
1 Year	3.56%
5 Years	3.69%
10 Years	4.39%
(Delaware Tax-Free Idaho Fund) | Class B
Average Annual Return:
1 Year	3.58%
5 Years	3.60%
10 Years	4.30%
(Delaware Tax-Free Idaho Fund) | Class C
Average Annual Return:
1 Year	6.58%
5 Years	3.85%
10 Years	4.16%
(Delaware Tax-Free New York Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Return:
1 Year	10.70%
5 Years	5.22%
10 Years	5.38%
(Delaware Tax-Free New York Fund) | Class A
Average Annual Return:
1 Year	5.04%
5 Years	3.96%
10 Years	4.96%
(Delaware Tax-Free New York Fund) | Class A | return after taxes on distributions
Average Annual Return:
1 Year	5.04%
5 Years	3.96%
10 Years	4.96%
(Delaware Tax-Free New York Fund) | Class A | return after taxes on distributions and sale of Fund shares
Average Annual Return:
1 Year	4.60%
5 Years	3.94%
10 Years	4.87%
(Delaware Tax-Free New York Fund) | Class B
Average Annual Return:
1 Year	5.16%
5 Years	3.89%
10 Years	4.82%
(Delaware Tax-Free New York Fund) | Class C
Average Annual Return:
1 Year	8.16%
5 Years	4.15%
10 Years	4.67%

XML

(Delaware National High-Yield Municipal Bond Fund)

What is the Fund's investment objective?

Delaware National High-Yield Municipal Bond Fund seeks a high level of current income exempt from federal income tax primarily through investment in medium- and lower-grade municipal obligations.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware National High-Yield Municipal Bond Fund)	Class A	Class B		Class C		Institutional Class
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware National High-Yield Municipal Bond Fund)		Class A	Class B	Class C	Institutional Class
Management fees		0.55%	0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%	none
Other expenses		0.19%	0.19%	0.19%	0.19%
Total annual fund operating expenses		0.99%	1.74%	1.74%	0.74%
Fee waivers and expense reimbursements	[1]	(0.14%)	(0.14%)	(0.14%)	(0.14%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.85%	1.60%	1.60%	0.60%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware National High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	533	738	959	1,596
Class B	563	759	1,081	1,842
Class C	263	534	931	2,040
Institutional Class	61	222	398	905

Expense Example, No Redemption (Delaware National High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	163	534	931	1,842
Class C	163	534	931	2,040

Portfolio turnover

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 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 34% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval. Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. 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 between 5 and 30 years. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. Under normal circumstances, the Fund will invest primarily in lower-rated municipal securities, which typically offer higher income potential and involve greater risk than higher-quality securities.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware National High-Yield Municipal Bond Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

^[1]

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 13.32%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 14.79% for the quarter ended September 30, 2009, and its lowest quarterly return was -14.15% for the quarter ended December 31, 2008. 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 returns in the table below do include the sales charge.

Average annual total returns for periods ended December 31, 2011

^[1]

Average Annual Total Returns (Delaware National High-Yield Municipal Bond Fund)	Label	1 Year	5 Years	10 Years	Lifetime
Class A		5.46%	3.27%	4.69%
Class A return after taxes on distributions		5.46%	3.27%	4.69%
Class A return after taxes on distributions and sale of Fund shares		5.29%	3.49%	4.73%
Class B		5.58%	3.17%	4.52%
Class C		8.56%	3.44%	4.39%
Institutional Class	(lifetime: 12/31/08-12/31/11)	10.62%			15.65%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)		10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Minnesota High-Yield Municipal Bond Fund)

What is the Fund's investment objective?

Delaware Minnesota High-Yield Municipal Bond Fund seeks a high level of current income that is exempt from federal income tax and from Minnesota state personal income taxes, primarily through investment in medium- and lower-grade municipal obligations.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Minnesota High-Yield Municipal Bond Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Minnesota High-Yield Municipal Bond Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.17%	0.17%	0.17%
Total annual fund operating expenses		0.97%	1.72%	1.72%
Fee waivers and expense reimbursements	[1]	(0.08%)	(0.08%)	(0.08%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.89%	1.64%	1.64%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Minnesota High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	537	737	955	1,579
Class B	567	759	1,076	1,825
Class C	267	534	926	2,024

Expense Example, No Redemption (Delaware Minnesota High-Yield Municipal Bond Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	167	534	926	1,825
Class C	167	534	926	2,024

Portfolio turnover

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 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 13% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, including the federal alternative minimum tax, and from Minnesota state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval.

The Fund is required to derive at least 95% of its income from Minnesota obligations in order for any of its income to be exempt from Minnesota state personal income taxes. Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. Under normal circumstances, the Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

The Fund will invest in lower-rated municipal securities ("junk bonds"), which typically offer higher income potential and involve greater risk than higher-quality securities.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Minnesota High-Yield Municipal Bond Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 7.11%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 9.03% for the quarter ended September 30, 2009 and its lowest quarterly return was -6.04% for the quarter ended December 31, 2008. 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Minnesota High-Yield Municipal Bond Fund)	1 Year	5 Years	10 Years
Class A	5.69%	3.42%	5.16%
Class A return after taxes on distributions	5.69%	3.42%	5.16%
Class A return after taxes on distributions and sale of Fund shares	5.14%	3.49%	5.08%
Class B	5.81%	3.34%	5.01%
Class C	8.80%	3.59%	4.87%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free California Fund)

What is the Fund's investment objective?

Delaware Tax-Free California Fund seeks as high a level of current income exempt from federal income tax and from the California state personal income tax as is consistent with preservation of capital.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Tax-Free California Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Tax-Free California Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.17%	0.17%	0.17%
Total annual fund operating expenses		0.97%	1.72%	1.72%
Fee waivers and expense reimbursements	[1]	(0.15%)	(0.15%)	(0.15%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.82%	1.57%	1.57%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Tax-Free California Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	530	731	948	1,573
Class B	560	752	1,069	1,819
Class C	260	527	919	2,018

Expense Example, No Redemption (Delaware Tax-Free California Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	160	527	919	1,819
Class C	160	527	919	2,018

Portfolio turnover

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 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 32% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, 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.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

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

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Tax-Free California Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 10.23%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 12.14% for the quarter ended September 30, 2009 and its lowest quarterly return was -5.79% for the quarter ended December 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Tax-Free California Fund)	1 Year	5 Years	10 Years
Class A	6.24%	3.42%	4.75%
Class A return after taxes on distributions	6.24%	3.42%	4.75%
Class A return after taxes on distributions and sale of Fund shares	5.55%	3.50%	4.69%
Class B	6.42%	3.33%	4.59%
Class C	9.44%	3.59%	4.44%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free Idaho Fund)

What is the Fund's investment objective?

Delaware Tax-Free Idaho Fund seeks as high a level of current income exempt from federal income tax and from Idaho personal income taxes as is consistent with preservation of capital.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Tax-Free Idaho Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Tax-Free Idaho Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.14%	0.14%	0.14%
Total annual fund operating expenses		0.94%	1.69%	1.69%
Fee waivers and expense reimbursements	[1]	(0.06%)	(0.06%)	(0.06%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.88%	1.63%	1.63%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Tax-Free Idaho Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	536	730	941	1,548
Class B	566	752	1,062	1,793
Class C	266	527	912	1,993

Expense Example, No Redemption (Delaware Tax-Free Idaho Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	166	527	912	1,793
Class C	166	527	912	1,993

Portfolio turnover

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 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 17% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, including the federal alternative minimum tax, and from Idaho state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Tax-Free Idaho Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 5.51%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 7.07% for the quarter ended September 30, 2009 and its lowest quarterly return was -4.60% for the quarter ended December 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Tax-Free Idaho Fund)	1 Year	5 Years	10 Years
Class A	3.48%	3.69%	4.45%
Class A return after taxes on distributions	3.48%	3.69%	4.45%
Class A return after taxes on distributions and sale of Fund shares	3.56%	3.69%	4.39%
Class B	3.58%	3.60%	4.30%
Class C	6.58%	3.85%	4.16%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free New York Fund)

What is the Fund's investment objective?

Delaware Tax-Free New York Fund seeks as high a level of current income exempt from federal income tax and from New York state personal income taxes as is consistent with preservation of capital.

What are the Fund's fees and expenses?

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder fees (fees paid directly from your investment)

Shareholder Fees (Delaware Tax-Free New York Fund)	Class A	Class B		Class C
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses (Delaware Tax-Free New York Fund)		Class A	Class B	Class C
Management fees		0.55%	0.55%	0.55%
Distribution and service (12b-1) fees		0.25%	1.00%	1.00%
Other expenses		0.21%	0.21%	0.21%
Total annual fund operating expenses		1.01%	1.76%	1.76%
Fee waivers and expense reimbursements	[1]	(0.21%)	(0.21%)	(0.21%)
Total annual fund operating expenses after fee waivers and expense reimbursements		0.80%	1.55%	1.55%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (Delaware Tax-Free New York Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	528	737	963	1,612
Class B	558	759	1,085	1,857
Class C	258	534	935	2,056

Expense Example, No Redemption (Delaware Tax-Free New York Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class B	158	534	935	1,857
Class C	158	534	935	2,056

Portfolio turnover

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 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 28% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, 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.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

What are the principal risks of investing in the Fund?

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

How has Delaware Tax-Free New York Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. The returns reflect 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 delawareinvestments.com/performance.

Year-by-year total return (Class A)

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 8.93%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 8.61% for the quarter ended September 30, 2009 and its lowest quarterly return was -5.10% for the quarter ended December 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.

Average annual total returns for periods ended December 31, 2011

Average Annual Total Returns (Delaware Tax-Free New York Fund)	1 Year	5 Years	10 Years
Class A	5.04%	3.96%	4.96%
Class A return after taxes on distributions	5.04%	3.96%	4.96%
Class A return after taxes on distributions and sale of Fund shares	4.60%	3.94%	4.87%
Class B	5.16%	3.89%	4.82%
Class C	8.16%	4.15%	4.67%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)	10.70%	5.22%	5.38%

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.60% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.64% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.57% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.63% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.55% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[1] Because the Fund has combined its retail and institutional prospectuses, the bar chart and the after tax returns in the average annual total returns table show the performance of the Fund's Class A shares.

XML

Shareholder Fees (dei_DocumentInformationDocumentAxis)	0 Months Ended
	Dec. 28, 2012
(Delaware National High-Yield Municipal Bond Fund) | Class A
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none
(Delaware National High-Yield Municipal Bond Fund) | Class B
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	4.00%	[1]
(Delaware National High-Yield Municipal Bond Fund) | Class C
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	1.00%	[1]
(Delaware National High-Yield Municipal Bond Fund) | Institutional Class
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class B
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	4.00%	[1]
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class C
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	1.00%	[1]
(Delaware Tax-Free California Fund) | Class A
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none
(Delaware Tax-Free California Fund) | Class B
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	4.00%	[1]
(Delaware Tax-Free California Fund) | Class C
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	1.00%	[1]
(Delaware Tax-Free Idaho Fund) | Class A
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none
(Delaware Tax-Free Idaho Fund) | Class B
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	4.00%	[1]
(Delaware Tax-Free Idaho Fund) | Class C
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	1.00%	[1]
(Delaware Tax-Free New York Fund) | Class A
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none
(Delaware Tax-Free New York Fund) | Class B
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	4.00%	[1]
(Delaware Tax-Free New York Fund) | Class C
Shareholder Fees:
Maximum sales charge (load) imposed on purchases as a percentage of offering price	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	1.00%	[1]

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

XML

Annual Total Returns (dei_DocumentInformationDocumentAxis, Class A)	0 Months Ended
	Dec. 28, 2012
(Delaware National High-Yield Municipal Bond Fund) | Class A
Bar Chart Table:
Annual Return 2002	4.69%
Annual Return 2003	6.57%
Annual Return 2004	7.36%
Annual Return 2005	5.92%
Annual Return 2006	6.16%
Annual Return 2007	(0.38%)
Annual Return 2008	(19.04%)
Annual Return 2009	31.49%
Annual Return 2010	5.04%
Annual Return 2011	10.40%
(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A
Bar Chart Table:
Annual Return 2002	8.68%
Annual Return 2003	8.19%
Annual Return 2004	6.35%
Annual Return 2005	5.86%
Annual Return 2006	5.69%
Annual Return 2007	0.05%
Annual Return 2008	(10.04%)
Annual Return 2009	21.32%
Annual Return 2010	2.54%
Annual Return 2011	10.63%
(Delaware Tax-Free California Fund) | Class A
Bar Chart Table:
Annual Return 2002	9.00%
Annual Return 2003	4.95%
Annual Return 2004	6.14%
Annual Return 2005	5.28%
Annual Return 2006	5.14%
Annual Return 2007	(0.11%)
Annual Return 2008	(8.04%)
Annual Return 2009	17.78%
Annual Return 2010	2.88%
Annual Return 2011	11.28%
(Delaware Tax-Free Idaho Fund) | Class A
Bar Chart Table:
Annual Return 2002	8.61%
Annual Return 2003	5.57%
Annual Return 2004	4.57%
Annual Return 2005	3.09%
Annual Return 2006	4.35%
Annual Return 2007	3.17%
Annual Return 2008	(2.83%)
Annual Return 2009	13.76%
Annual Return 2010	1.55%
Annual Return 2011	8.38%
(Delaware Tax-Free New York Fund) | Class A
Bar Chart Table:
Annual Return 2002	10.15%
Annual Return 2003	5.61%
Annual Return 2004	5.14%
Annual Return 2005	4.11%
Annual Return 2006	4.95%
Annual Return 2007	2.17%
Annual Return 2008	(3.20%)
Annual Return 2009	14.46%
Annual Return 2010	2.17%
Annual Return 2011	9.96%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Aug. 31, 2012

Registrant Name

dei_EntityRegistrantName

VOYAGEUR MUTUAL FUNDS

Central Index Key

dei_EntityCentralIndexKey

0000906236

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Dec. 28, 2012

Document Effective Date

dei_DocumentEffectiveDate

Dec. 28, 2012

Prospectus Date

rr_ProspectusDate

Dec. 28, 2012

(Delaware National High-Yield Municipal Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

What is the Fund's investment objective?

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Delaware National High-Yield Municipal Bond Fund seeks a high level of current income exempt from federal income tax primarily through investment in medium- and lower-grade municipal obligations.

Expense [Heading]

rr_ExpenseHeading

What are the Fund's fees and expenses?

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2013-12-27

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio turnover

Portfolio Turnover [Text Block]

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 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 34% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

34.00%

Expense Breakpoint Discounts [Text]

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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

100,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

What are the Fund's principal investment strategies?

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval. Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. 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 between 5 and 30 years. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. Under normal circumstances, the Fund will invest primarily in lower-rated municipal securities, which typically offer higher income potential and involve greater risk than higher-quality securities.

Risk [Heading]

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative [Text Block]

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

Risk Lose Money [Text]

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 [Heading]

rr_BarChartAndPerformanceTableHeading

How has Delaware National High-Yield Municipal Bond Fund performed?

Performance Narrative [Text Block]

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 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 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 delawareinvestments.com/performance.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800 523-1918

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

delawareinvestments.com/performance

Performance Past Does Not Indicate Future [Text]

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

Year-by-year total return (Class A)

^[7]

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 13.32%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 14.79% for the quarter ended September 30, 2009, and its lowest quarterly return was -14.15% for the quarter ended December 31, 2008. 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 returns in the table below do include the sales charge.

Performance Table Heading

rr_PerformanceTableHeading

Average annual total returns for periods ended December 31, 2011

^[7]

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary.

Performance Table Closing [Text Block]

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware National High-Yield Municipal Bond Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.38%

(Delaware National High-Yield Municipal Bond Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

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

(0.14%)

^[2]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.85%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

533

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

738

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

959

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,596

Annual Return 2002

rr_AnnualReturn2002

4.69%

Annual Return 2003

rr_AnnualReturn2003

6.57%

Annual Return 2004

rr_AnnualReturn2004

7.36%

Annual Return 2005

rr_AnnualReturn2005

5.92%

Annual Return 2006

rr_AnnualReturn2006

6.16%

Annual Return 2007

rr_AnnualReturn2007

(0.38%)

Annual Return 2008

rr_AnnualReturn2008

(19.04%)

Annual Return 2009

rr_AnnualReturn2009

31.49%

Annual Return 2010

rr_AnnualReturn2010

5.04%

Annual Return 2011

rr_AnnualReturn2011

10.40%

Year to Date Return, Label

rr_YearToDateReturnLabel

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 13.32%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.32%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return was 14.79% for the quarter ended September 30, 2009

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.79%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return was -14.15% for the quarter ended December 31, 2008

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.15%)

1 Year

rr_AverageAnnualReturnYear01

5.46%

5 Years

rr_AverageAnnualReturnYear05

3.27%

10 Years

rr_AverageAnnualReturnYear10

4.69%

(Delaware National High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.46%

5 Years

rr_AverageAnnualReturnYear05

3.27%

10 Years

rr_AverageAnnualReturnYear10

4.69%

(Delaware National High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.29%

5 Years

rr_AverageAnnualReturnYear05

3.49%

10 Years

rr_AverageAnnualReturnYear10

4.73%

(Delaware National High-Yield Municipal Bond Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

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

4.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.19%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.74%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.14%)

^[2]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.60%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

563

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

759

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,081

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,842

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

163

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

534

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

931

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,842

1 Year

rr_AverageAnnualReturnYear01

5.58%

5 Years

rr_AverageAnnualReturnYear05

3.17%

10 Years

rr_AverageAnnualReturnYear10

4.52%

(Delaware National High-Yield Municipal Bond Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.19%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.74%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.14%)

^[2]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.60%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

263

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

534

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

931

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,040

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

163

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

534

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

931

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,040

1 Year

rr_AverageAnnualReturnYear01

8.56%

5 Years

rr_AverageAnnualReturnYear05

3.44%

10 Years

rr_AverageAnnualReturnYear10

4.39%

(Delaware National High-Yield Municipal Bond Fund) | Institutional Class

Risk/Return:

rr_RiskReturnAbstract

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

(0.14%)

^[2]

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

222

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

398

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

905

Label

rr_AverageAnnualReturnLabel

(lifetime: 12/31/08-12/31/11)

1 Year

rr_AverageAnnualReturnYear01

10.62%

5 Years

rr_AverageAnnualReturnYear05

Lifetime

rr_AverageAnnualReturnSinceInception

15.65%

(Delaware Minnesota High-Yield Municipal Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

What is the Fund's investment objective?

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Delaware Minnesota High-Yield Municipal Bond Fund seeks a high level of current income that is exempt from federal income tax and from Minnesota state personal income taxes, primarily through investment in medium- and lower-grade municipal obligations.

Expense [Heading]

rr_ExpenseHeading

What are the Fund's fees and expenses?

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2013-12-27

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio turnover

Portfolio Turnover [Text Block]

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 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 13% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

13.00%

Expense Breakpoint Discounts [Text]

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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

100,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

What are the Fund's principal investment strategies?

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, including the federal alternative minimum tax, and from Minnesota state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval.

The Fund is required to derive at least 95% of its income from Minnesota obligations in order for any of its income to be exempt from Minnesota state personal income taxes. Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. Under normal circumstances, the Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

The Fund will invest in lower-rated municipal securities ("junk bonds"), which typically offer higher income potential and involve greater risk than higher-quality securities.

Risk [Heading]

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative [Text Block]

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

Risk Lose Money [Text]

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 [Heading]

rr_BarChartAndPerformanceTableHeading

How has Delaware Minnesota High-Yield Municipal Bond Fund performed?

Performance Narrative [Text Block]

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 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 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 delawareinvestments.com/performance.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800 523-1918

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

delawareinvestments.com/performance

Performance Past Does Not Indicate Future [Text]

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

Year-by-year total return (Class A)

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 7.11%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 9.03% for the quarter ended September 30, 2009 and its lowest quarterly return was -6.04% for the quarter ended December 31, 2008. 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, 2011

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary.

Performance Table Closing [Text Block]

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Minnesota High-Yield Municipal Bond Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.38%

(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

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

0.17%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.97%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.89%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

537

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

737

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

955

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,579

Annual Return 2002

rr_AnnualReturn2002

8.68%

Annual Return 2003

rr_AnnualReturn2003

8.19%

Annual Return 2004

rr_AnnualReturn2004

6.35%

Annual Return 2005

rr_AnnualReturn2005

5.86%

Annual Return 2006

rr_AnnualReturn2006

5.69%

Annual Return 2007

rr_AnnualReturn2007

0.05%

Annual Return 2008

rr_AnnualReturn2008

(10.04%)

Annual Return 2009

rr_AnnualReturn2009

21.32%

Annual Return 2010

rr_AnnualReturn2010

2.54%

Annual Return 2011

rr_AnnualReturn2011

10.63%

Year to Date Return, Label

rr_YearToDateReturnLabel

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 7.11%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.11%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return was 9.03% for the quarter ended September 30, 2009

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.03%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return was -6.04% for the quarter ended December 31, 2008

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(6.04%)

1 Year

rr_AverageAnnualReturnYear01

5.69%

5 Years

rr_AverageAnnualReturnYear05

3.42%

10 Years

rr_AverageAnnualReturnYear10

5.16%

(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.69%

5 Years

rr_AverageAnnualReturnYear05

3.42%

10 Years

rr_AverageAnnualReturnYear10

5.16%

(Delaware Minnesota High-Yield Municipal Bond Fund) | Class A | return after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.14%

5 Years

rr_AverageAnnualReturnYear05

3.49%

10 Years

rr_AverageAnnualReturnYear10

5.08%

(Delaware Minnesota High-Yield Municipal Bond Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

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

4.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.17%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.72%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.64%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

567

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

759

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,076

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,825

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

167

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

534

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

926

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,825

1 Year

rr_AverageAnnualReturnYear01

5.81%

5 Years

rr_AverageAnnualReturnYear05

3.34%

10 Years

rr_AverageAnnualReturnYear10

5.01%

(Delaware Minnesota High-Yield Municipal Bond Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.17%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.72%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.64%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

267

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

534

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

926

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,024

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

167

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

534

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

926

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,024

1 Year

rr_AverageAnnualReturnYear01

8.80%

5 Years

rr_AverageAnnualReturnYear05

3.59%

10 Years

rr_AverageAnnualReturnYear10

4.87%

(Delaware Tax-Free California Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

What is the Fund's investment objective?

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Delaware Tax-Free California Fund seeks as high a level of current income exempt from federal income tax and from the California state personal income tax as is consistent with preservation of capital.

Expense [Heading]

rr_ExpenseHeading

What are the Fund's fees and expenses?

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2013-12-27

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio turnover

Portfolio Turnover [Text Block]

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 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 32% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

32.00%

Expense Breakpoint Discounts [Text]

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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

100,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

What are the Fund's principal investment strategies?

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, 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.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

Risk [Heading]

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative [Text Block]

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

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

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

Risk Lose Money [Text]

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 [Heading]

rr_BarChartAndPerformanceTableHeading

How has Delaware Tax-Free California Fund performed?

Performance Narrative [Text Block]

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 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 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 delawareinvestments.com/performance.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800 523-1918

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

delawareinvestments.com/performance

Performance Past Does Not Indicate Future [Text]

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

Year-by-year total return (Class A)

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 10.23%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 12.14% for the quarter ended September 30, 2009 and its lowest quarterly return was -5.79% for the quarter ended December 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, 2011

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary.

Performance Table Closing [Text Block]

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free California Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.38%

(Delaware Tax-Free California Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

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

0.17%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.97%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[4]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.82%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

530

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

731

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

948

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,573

Annual Return 2002

rr_AnnualReturn2002

9.00%

Annual Return 2003

rr_AnnualReturn2003

4.95%

Annual Return 2004

rr_AnnualReturn2004

6.14%

Annual Return 2005

rr_AnnualReturn2005

5.28%

Annual Return 2006

rr_AnnualReturn2006

5.14%

Annual Return 2007

rr_AnnualReturn2007

(0.11%)

Annual Return 2008

rr_AnnualReturn2008

(8.04%)

Annual Return 2009

rr_AnnualReturn2009

17.78%

Annual Return 2010

rr_AnnualReturn2010

2.88%

Annual Return 2011

rr_AnnualReturn2011

11.28%

Year to Date Return, Label

rr_YearToDateReturnLabel

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 10.23%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

10.23%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return was 12.14% for the quarter ended September 30, 2009

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.14%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return was -5.79% for the quarter ended December 31, 2010

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.79%)

1 Year

rr_AverageAnnualReturnYear01

6.24%

5 Years

rr_AverageAnnualReturnYear05

3.42%

10 Years

rr_AverageAnnualReturnYear10

4.75%

(Delaware Tax-Free California Fund) | Class A | return after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.24%

5 Years

rr_AverageAnnualReturnYear05

3.42%

10 Years

rr_AverageAnnualReturnYear10

4.75%

(Delaware Tax-Free California Fund) | Class A | return after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.55%

5 Years

rr_AverageAnnualReturnYear05

3.50%

10 Years

rr_AverageAnnualReturnYear10

4.69%

(Delaware Tax-Free California Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

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

4.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.17%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.72%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[4]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.57%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

560

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

752

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,069

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,819

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

160

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

527

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

919

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,819

1 Year

rr_AverageAnnualReturnYear01

6.42%

5 Years

rr_AverageAnnualReturnYear05

3.33%

10 Years

rr_AverageAnnualReturnYear10

4.59%

(Delaware Tax-Free California Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.17%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.72%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[4]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.57%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

260

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

527

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

919

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,018

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

160

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

527

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

919

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,018

1 Year

rr_AverageAnnualReturnYear01

9.44%

5 Years

rr_AverageAnnualReturnYear05

3.59%

10 Years

rr_AverageAnnualReturnYear10

4.44%

(Delaware Tax-Free Idaho Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

What is the Fund's investment objective?

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Delaware Tax-Free Idaho Fund seeks as high a level of current income exempt from federal income tax and from Idaho personal income taxes as is consistent with preservation of capital.

Expense [Heading]

rr_ExpenseHeading

What are the Fund's fees and expenses?

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2013-12-27

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio turnover

Portfolio Turnover [Text Block]

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 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 17% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

17.00%

Expense Breakpoint Discounts [Text]

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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

100,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

What are the Fund's principal investment strategies?

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, including the federal alternative minimum tax, and from Idaho state personal income taxes. This is a fundamental investment policy that may not be changed without prior shareholder approval.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

Risk [Heading]

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative [Text Block]

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

Risk Lose Money [Text]

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 [Heading]

rr_BarChartAndPerformanceTableHeading

How has Delaware Tax-Free Idaho Fund performed?

Performance Narrative [Text Block]

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 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 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 delawareinvestments.com/performance.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800 523-1918

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

delawareinvestments.com/performance

Performance Past Does Not Indicate Future [Text]

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

Year-by-year total return (Class A)

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 5.51%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 7.07% for the quarter ended September 30, 2009 and its lowest quarterly return was -4.60% for the quarter ended December 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, 2011

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary.

Performance Table Closing [Text Block]

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free Idaho Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.38%

(Delaware Tax-Free Idaho Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

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

0.14%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.94%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[5]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.88%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

536

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

730

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

941

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,548

Annual Return 2002

rr_AnnualReturn2002

8.61%

Annual Return 2003

rr_AnnualReturn2003

5.57%

Annual Return 2004

rr_AnnualReturn2004

4.57%

Annual Return 2005

rr_AnnualReturn2005

3.09%

Annual Return 2006

rr_AnnualReturn2006

4.35%

Annual Return 2007

rr_AnnualReturn2007

3.17%

Annual Return 2008

rr_AnnualReturn2008

(2.83%)

Annual Return 2009

rr_AnnualReturn2009

13.76%

Annual Return 2010

rr_AnnualReturn2010

1.55%

Annual Return 2011

rr_AnnualReturn2011

8.38%

Year to Date Return, Label

rr_YearToDateReturnLabel

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 5.51%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.51%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return was 7.07% for the quarter ended September 30, 2009

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.07%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return was -4.60% for the quarter ended December 31, 2010

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(4.60%)

1 Year

rr_AverageAnnualReturnYear01

3.48%

5 Years

rr_AverageAnnualReturnYear05

3.69%

10 Years

rr_AverageAnnualReturnYear10

4.45%

(Delaware Tax-Free Idaho Fund) | Class A | return after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.48%

5 Years

rr_AverageAnnualReturnYear05

3.69%

10 Years

rr_AverageAnnualReturnYear10

4.45%

(Delaware Tax-Free Idaho Fund) | Class A | return after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.56%

5 Years

rr_AverageAnnualReturnYear05

3.69%

10 Years

rr_AverageAnnualReturnYear10

4.39%

(Delaware Tax-Free Idaho Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

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

4.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.14%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.69%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[5]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.63%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

566

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

752

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,062

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,793

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

166

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

527

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

912

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,793

1 Year

rr_AverageAnnualReturnYear01

3.58%

5 Years

rr_AverageAnnualReturnYear05

3.60%

10 Years

rr_AverageAnnualReturnYear10

4.30%

(Delaware Tax-Free Idaho Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.14%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.69%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[5]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.63%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

266

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

527

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

912

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,993

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

166

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

527

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

912

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,993

1 Year

rr_AverageAnnualReturnYear01

6.58%

5 Years

rr_AverageAnnualReturnYear05

3.85%

10 Years

rr_AverageAnnualReturnYear10

4.16%

(Delaware Tax-Free New York Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

What is the Fund's investment objective?

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Delaware Tax-Free New York Fund seeks as high a level of current income exempt from federal income tax and from New York state personal income taxes as is consistent with preservation of capital.

Expense [Heading]

rr_ExpenseHeading

What are the Fund's fees and expenses?

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table 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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2013-12-27

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio turnover

Portfolio Turnover [Text Block]

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 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 28% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

28.00%

Expense Breakpoint Discounts [Text]

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 Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund's prospectus under the section entitled "About your account," and in the Fund's statement of additional information under the section entitled "Purchasing shares."

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

100,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

What are the Fund's principal investment strategies?

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets in municipal securities the income from which is exempt from federal income taxes, 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.

Municipal debt obligations are issued by state and local governments to raise funds for various public purposes such as hospitals, schools, and general capital expenses. The Fund will invest its assets in securities with maturities of various lengths, depending on market conditions. We will adjust the average maturity of the bonds in the portfolio to attempt to provide a high level of tax-exempt income consistent with preservation of capital. The Fund's income level will vary depending on current interest rates and the specific securities in the portfolio. The Fund may concentrate its investments in certain types of bonds or in a certain segment of the municipal bond market when the supply of bonds in other sectors does not suit our investment needs. The Fund will generally have a dollar-weighted average effective maturity of between 5 and 30 years.

Risk [Heading]

rr_RiskHeading

What are the principal risks of investing in the Fund?

Risk Narrative [Text Block]

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. Principal risks include:

Investments not guaranteed by the Manager or its affiliates — Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (Macquarie Group), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

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 securities will decrease in value if interest rates rise. This risk is generally associated with bonds.

Credit risk — The risk that an issuer of a debt security, including a governmental issuer, may be unable to make interest payments and 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; and greater price volatility and risk of loss of income and principal than are higher rated securities. High yield bonds are sometimes issued by municipalities with less financial strength and therefore less ability to make projected debt payments on the bonds.

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.

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

Geographic concentration risk — The risk that heightened sensitivity to regional, state, and local political and economic conditions could adversely affect the holdings in a fund. There is also the risk that there could be an inadequate supply of municipal bonds in a particular state.

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.

Derivatives risk — Derivative contracts, such as options, futures and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, or a securities index to which a derivative contract is associated, moves in the opposite direction from what the portfolio manager anticipated.

Counterparty risk — The risk that a counterparty to a derivative contract (such as a swap, futures, or options contract) or a repurchase agreement may fail to perform its obligations under the contract or agreement due to financial difficulties (such as a bankruptcy or reorganization).

Government and regulatory risk — The risk that governments or regulatory authorities have, from time to time, taken or considered actions that could adversely affect various sectors of the securities markets.

Risk Lose Money [Text]

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 [Heading]

rr_BarChartAndPerformanceTableHeading

How has Delaware Tax-Free New York Fund performed?

Performance Narrative [Text Block]

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 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 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 delawareinvestments.com/performance.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800 523-1918

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

delawareinvestments.com/performance

Performance Past Does Not Indicate Future [Text]

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

Year-by-year total return (Class A)

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 8.93%. During the periods illustrated in this bar chart, Class A's highest quarterly return was 8.61% for the quarter ended September 30, 2009 and its lowest quarterly return was -5.10% for the quarter ended December 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, 2011

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary.

Performance Table Closing [Text Block]

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-deferred investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

(Delaware Tax-Free New York Fund) | Barclays Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.70%

5 Years

rr_AverageAnnualReturnYear05

5.22%

10 Years

rr_AverageAnnualReturnYear10

5.38%

(Delaware Tax-Free New York Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

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

0.21%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.01%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.21%)

^[6]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

0.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

528

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

737

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

963

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,612

Annual Return 2002

rr_AnnualReturn2002

10.15%

Annual Return 2003

rr_AnnualReturn2003

5.61%

Annual Return 2004

rr_AnnualReturn2004

5.14%

Annual Return 2005

rr_AnnualReturn2005

4.11%

Annual Return 2006

rr_AnnualReturn2006

4.95%

Annual Return 2007

rr_AnnualReturn2007

2.17%

Annual Return 2008

rr_AnnualReturn2008

(3.20%)

Annual Return 2009

rr_AnnualReturn2009

14.46%

Annual Return 2010

rr_AnnualReturn2010

2.17%

Annual Return 2011

rr_AnnualReturn2011

9.96%

Year to Date Return, Label

rr_YearToDateReturnLabel

As of September 30, 2012, the Fund's Class A shares had a calendar year-to-date return of 8.93%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

8.93%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return was 8.61% for the quarter ended September 30, 2009

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.61%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return was -5.10% for the quarter ended December 31, 2010

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.10%)

1 Year

rr_AverageAnnualReturnYear01

5.04%

5 Years

rr_AverageAnnualReturnYear05

3.96%

10 Years

rr_AverageAnnualReturnYear10

4.96%

(Delaware Tax-Free New York Fund) | Class A | return after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.04%

5 Years

rr_AverageAnnualReturnYear05

3.96%

10 Years

rr_AverageAnnualReturnYear10

4.96%

(Delaware Tax-Free New York Fund) | Class A | return after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.60%

5 Years

rr_AverageAnnualReturnYear05

3.94%

10 Years

rr_AverageAnnualReturnYear10

4.87%

(Delaware Tax-Free New York Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

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

4.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.21%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.76%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.21%)

^[6]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

558

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

759

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,085

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,857

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

158

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

534

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

935

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,857

1 Year

rr_AverageAnnualReturnYear01

5.16%

5 Years

rr_AverageAnnualReturnYear05

3.89%

10 Years

rr_AverageAnnualReturnYear10

4.82%

(Delaware Tax-Free New York Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases as a percentage of offering price

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.55%

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.21%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.76%

Fee waivers and expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.21%)

^[6]

Total annual fund operating expenses after fee waivers and expense reimbursements

rr_NetExpensesOverAssets

1.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

258

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

534

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

935

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,056

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

158

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

534

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

935

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,056

1 Year

rr_AverageAnnualReturnYear01

8.16%

5 Years

rr_AverageAnnualReturnYear05

4.15%

10 Years

rr_AverageAnnualReturnYear10

4.67%

[1] If you redeem Class B shares during the first year after you bought them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[2] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.60% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[3] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.64% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[4] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.57% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[5] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.63% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[6] The Fund's investment manager, Delaware Management Company (Manager), is contractually waiving its investment advisory fees and/or paying expenses (excluding any 12b-1 fees, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) to the extent necessary to prevent total annual fund operating expenses from exceeding 0.55% of the Fund's average daily net assets from December 28, 2012 through December 27, 2013. The waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.

[7] Because the Fund has combined its retail and institutional prospectuses, the bar chart and the after tax returns in the average annual total returns table show the performance of the Fund's Class A shares.