2.3.0.11 Html 3 11 1 false 3 0 false 4 true false R1.htm 010000 - Document - Risk/Return Summary {Unlabeled} Sheet http://xbrl.sec.gov/rr/role/RiskReturn Risk/Return Summary false false R2.htm 010002 - Document - Delaware International Bond Fund - Retail (A, C, R) {Unlabeled} Sheet http://delaware/role/AAAA Delaware International Bond Fund - Retail (A, C, R) false false R3.htm 010003 - Document - Delaware International Bond Fund - Institutional {Unlabeled} Sheet http://delaware/role/BBBB Delaware International Bond Fund - Institutional false true R4.htm 030000 - Document - Risk/Return Detail {Unlabeled} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetail Risk/Return Detail false false All Reports Book All Reports delaware-20110728.xml delaware-20110728.xsd delaware-20110728_def.xml delaware-20110728_lab.xml delaware-20110728_pre.xml true true