3.23.3 html 10 89 1 true 9 0 false 3 false false R1.htm 01001 - Document - Document and Entity Information {Elements} Sheet http://franklintempleton.com/20230731/role/DocumentAndEntityInformation1 Document and Entity Information Risk/Return 1 false true R2.htm 01002 - Document - Risk/Return Summary (FRANKLIN GOLD & PRECIOUS METALS FUND) {Unlabeled} Sheet http://franklintempleton.com/20230731/role/RRSummary2 Risk/Return Summary (FRANKLIN GOLD & PRECIOUS METALS FUND) Risk/Return 2 false false R3.htm 01003 - Disclosure - Risk/Return Detail Data (FRANKLIN GOLD & PRECIOUS METALS FUND) {Elements} Sheet http://franklintempleton.com/20230731/role/RRDetailData3 Risk/Return Detail Data (FRANKLIN GOLD & PRECIOUS METALS FUND) Risk/Return 3 false false All Reports Book All Reports c485bpos-20231127.xsd c485bpos-20231127_cal.xml c485bpos-20231127_def.xml c485bpos-20231127_lab.xml c485bpos-20231127_pre.xml c485bpos.htm img_3afc14a41d6d4f2.jpg img_b4fcea8adcb64f3.jpg img_c537c782e8714f3.jpg img_e2cf689019c64f2.jpg img_ee8bbaeb0b0f4f2.jpg BarChart1.png http://xbrl.sec.gov/dei/2022 http://xbrl.sec.gov/rr/2022 true true