3.3.1.900 html 34 81 1 true 29 0 false 4 false false R1.htm 010001 - Document - Document And Entity Information {Elements} Sheet http://ofimltistmun-20151127/role/DocumentDocumentandEntityInformation Document And Entity Information 1 false true R2.htm 010002 - Document - Oppenheimer Rochester Pennsylvania Municipal Fund {Unlabeled} Sheet http://ofimltistmun-20151127/role/BBBB Oppenheimer Rochester Pennsylvania Municipal Fund 2 false true R3.htm 010003 - Document - Oppenheimer Rochester New Jersey Municipal Fund {Unlabeled} Sheet http://ofimltistmun-20151127/role/AAAA Oppenheimer Rochester New Jersey Municipal Fund 3 false true R4.htm 010004 - Document - Oppenheimer Rochester High Yield Municipal Fund {Unlabeled} Sheet http://ofimltistmun-20151127/role/CCCC Oppenheimer Rochester High Yield Municipal Fund 4 false false R23.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 5 false false All Reports Book All Reports ofimltistmun-20151127.xml ofimltistmun-20151127.xsd ofimltistmun-20151127_def.xml ofimltistmun-20151127_lab.xml ofimltistmun-20151127_pre.xml BarChart1.png BarChart2.png BarChart3.png true false