010002 - Document - Delaware Core Bond Fund {Unlabeled} link:presentationLink link:calculationLink link:definitionLink 020062 - Schedule - Average Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink 020032 - Schedule - Expense Example {Transposed} link:presentationLink link:calculationLink link:definitionLink 020022 - Schedule - Annual Fund Operating Expenses link:presentationLink link:calculationLink link:definitionLink 020012 - Schedule - Shareholder Fees link:presentationLink link:calculationLink link:definitionLink 020042 - Schedule - Expense Example, No Redemption {Transposed} link:presentationLink link:calculationLink link:definitionLink 020052 - Schedule - Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink 010003 - Document - Delaware Corporate Bond Fund / Delaware Extended Duration Bond Fund {Unlabeled} link:presentationLink link:calculationLink link:definitionLink 020063 - Schedule - Average Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink 020034 - Schedule - Expense Example {Transposed} link:presentationLink link:calculationLink link:definitionLink 020023 - Schedule - Annual Fund Operating Expenses link:presentationLink link:calculationLink link:definitionLink 020013 - Schedule - Shareholder Fees link:presentationLink link:calculationLink link:definitionLink 020043 - Schedule - Expense Example, No Redemption {Transposed} link:presentationLink link:calculationLink link:definitionLink 020053 - Schedule - Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink 010004 - Document - Delaware High-Yield Opportunities Fund {Unlabeled} link:presentationLink link:calculationLink link:definitionLink 020064 - Schedule - Average Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink 020036 - Schedule - Expense Example {Transposed} link:presentationLink link:calculationLink link:definitionLink 020024 - Schedule - Annual Fund Operating Expenses link:presentationLink link:calculationLink link:definitionLink 020014 - Schedule - Shareholder Fees link:presentationLink link:calculationLink link:definitionLink 020044 - Schedule - Expense Example, No Redemption {Transposed} link:presentationLink link:calculationLink link:definitionLink 020054 - Schedule - Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink 010005 - Document - Delaware Diversified Floating Rate Fund {Unlabeled} link:presentationLink link:calculationLink link:definitionLink 020065 - Schedule - Average Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink 020038 - Schedule - Expense Example {Transposed} link:presentationLink link:calculationLink link:definitionLink 020025 - Schedule - Annual Fund Operating Expenses link:presentationLink link:calculationLink link:definitionLink 020015 - Schedule - Shareholder Fees link:presentationLink link:calculationLink link:definitionLink 020045 - Schedule - Expense Example, No Redemption {Transposed} link:presentationLink link:calculationLink link:definitionLink 020055 - Schedule - Annual Total Returns {Transposed} link:presentationLink link:calculationLink link:definitionLink