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Label Element Value
[RiskReturnAbstract] rr_RiskReturnAbstract  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Nov. 30, 2012
Registrant Name dei_EntityRegistrantName DELAWARE GROUP EQUITY FUNDS II
Central Index Key dei_EntityCentralIndexKey 0000027574
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Nov. 04, 2013
Document Effective Date dei_DocumentEffectiveDate Nov. 04, 2013
Prospectus Date rr_ProspectusDate Mar. 29, 2013
Delaware Value Fund
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Delaware Value® Fund
Supplement [Text Block] delaw_SupplementTextBlock

DELAWARE GROUP® EQUITY FUNDS II

Delaware Value® Fund (the “Fund”)

Supplement to the Fund’s Class A, Class B, Class C, Class R, and Institutional Class
Statutory Prospectus dated March 29, 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

October 31, 2014
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
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 applicable waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption

(if not redeemed)
Supplement Closing [Text Block] delaw_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 November 4, 2013.
Delaware Value 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 0.61%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.24%
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.12%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.09%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 680
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 908
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,154
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,857
Delaware Value 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% [2]
Management Fees rr_ManagementFeesOverAssets 0.61%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.88%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.78%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 512
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 790
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,169
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,938
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 112
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 515
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 944
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,938
Delaware Value 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% [2]
Management Fees rr_ManagementFeesOverAssets 0.61%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.88%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 288
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 588
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,013
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,199
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 188
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 588
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,013
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,199
Delaware Value 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 0.61%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.38%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 137
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 434
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 752
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,655
Delaware Value 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 0.61%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 0.88%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 278
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 485
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,082
[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 plan, taxes, interest, inverse floater program expenses, short sale and dividend interest expenses, brokerage fees, certain insurance costs, acquired fund fees and expenses, 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 0.85% of the Fund's average daily net assets from March 28, 2013 through March 28, 2014. 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 November 1, 2013 through October 31, 2014. These waivers and reimbursements may only be terminated by agreement of the Manager and the Distributor, as applicable, and the Fund. Additionally, the Fund's Class A shares are subject to a blended 12b-1 fee of 0.10% on all shares acquired prior to May 2, 1994, and 0.25% on all shares acquired on or after May 2, 1994. This method of calculating Class A 12b-1 fees may be discontinued at the sole discretion of the Board.
[2] 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.