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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading

Delaware Diversified Income Fund (Fund)
Supplement [Text Block] ck0000910682_SupplementTextBlock

DELAWARE GROUP® ADVISER FUNDS

 

Delaware Diversified Income Fund (Fund)

 

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

Statutory Prospectus dated February 28, 2014

 

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 $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

March 31, 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 $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

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

 

Example
Expense Example by Year [Heading] rr_ExpenseExampleByYearHeading

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 Distributor’s expense waiver 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] ck0000910682_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 April 4, 2014.
Class A
  
Prospectus [Line Items] rr_ProspectusLineItems  
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 0.44%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 0.90%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 538
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 724
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 926
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,508
Class B
  
Prospectus [Line Items] rr_ProspectusLineItems  
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 0.44%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 1.65%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.75%) [2]
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 492
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 672
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 976
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,690
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 447
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 826
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,690
Class C
  
Prospectus [Line Items] rr_ProspectusLineItems  
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 0.44%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 1.65%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 897
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,955
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 897
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,955
Class R
  
Prospectus [Line Items] rr_ProspectusLineItems  
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 0.44%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 1.15%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 117
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 365
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 633
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,398
Institutional Class
  
Prospectus [Line Items] rr_ProspectusLineItems  
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 0.44%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 0.65%
Fee waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses after fee waivers and expense reimbursements rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
[1] 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 3.00% 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 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 April 1, 2014 through March 31, 2015. These waivers and reimbursements may only be terminated by agreement of the Distributor and the Fund.