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Label Element Value
[RiskReturnAbstract] rr_RiskReturnAbstract  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Apr. 30, 2013
Registrant Name dei_EntityRegistrantName VOYAGEUR MUTUAL FUNDS III
Central Index Key dei_EntityCentralIndexKey 0000763749
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jan. 13, 2014
Document Effective Date dei_DocumentEffectiveDate Jan. 13, 2014
Prospectus Date rr_ProspectusDate Aug. 28, 2013
Delaware Select Growth Fund
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Delaware Select Growth Fund (the “Fund”)
Supplement [TextBlock] vmfiii_SupplementTextBlock

VOYAGEUR MUTUAL FUNDS III

 

Delaware Select Growth Fund (the “Fund”)

 

Supplement to the Fund’s Class A, Class B, Class C, Class R, and Institutional Class

Statutory Prospectus dated August 28, 2013

 

This supplement supersedes the supplement dated October 16, 2013. The following replaces the information in the section entitled, “What are the Fund’s fees and expenses?”.
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 $50,000 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

Aug. 28, 2015
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 $50,000 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 $ 50,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent

The Class R shares’ distribution and service (12b-1) fees have been restated to reflect a permanent reduction in their fees to 0.50%.
Expense Example [Heading] rr_ExpenseExampleHeading

The following replaces the information in the section entitled, “Example.”

 

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 any applicable Distributor expense waivers 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, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption

(if not redeemed)
Supplement Closing [TextBlock] vmfiii_SupplementClosingTextBlock

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 (the “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.

 

Please keep this Supplement for future reference.

 

This Supplement is dated January 13, 2014.
Delaware Select Growth Fund | Class A
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases as a percentage of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.73%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 1.27%
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.27%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 697
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 955
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,232
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,021
Delaware Select Growth Fund | Class B
  
[RiskReturnAbstract] 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 0.73%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 2.02% [2]
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.75%) [2]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.27%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 529
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 836
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,244
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,094
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 129
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 561
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,019
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,094
Delaware Select Growth Fund | Class C
  
[RiskReturnAbstract] 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 0.73%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 2.02%
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 2.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 305
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 634
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,088
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,348
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 205
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 634
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,088
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,348
Delaware Select Growth Fund | Class R
  
[RiskReturnAbstract] 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 0.73%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50% [3]
Other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 1.52%
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.52%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 155
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 480
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 829
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,813
Delaware Select Growth Fund | Institutional Class
  
[RiskReturnAbstract] 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 0.73%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 1.02%
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,248
[1] If you redeem Class B shares during the first year after you buy them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.25% during the second year, 2.75% during the third year, 2.25% during the fourth and fifth years, 1.50% 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 distributor, Delaware Distributors, L.P. (Distributor), has contracted to limit the Fund's Class B shares' 12b-1 fee to no more than 0.25% of average daily net assets from Jan. 2, 2014 through Aug. 28, 2015. These waivers and reimbursements may only be terminated by agreement of the Manager or Distributor, as applicable, and the Fund.
[3] The Class R shares' distribution and service (12b-1) fees have been restated to reflect a permanent reduction in their fees to 0.50%.