3.7.0.1 html 43 10 1 false 44 0 false 1 false false R1.htm 00000004 - Document - Document and Entity Information Sheet http://franklintempleton.com/role/DocumentAndEntityInformation Document and Entity Information 1 false false R2.htm 00000005 - Document - Risk/Return Summary - (Franklin Balanced Fund) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinBalancedFundUnlabeled Risk/Return Summary - (Franklin Balanced Fund) 2 false false R3.htm 00000006 - Disclosure - Risk/Return Detail Data - (Franklin Balanced Fund) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinBalancedFundElements Risk/Return Detail Data - (Franklin Balanced Fund) 3 false false R4.htm 00000007 - Document - Risk/Return Summary - (FRANKLIN CONVERTIBLE SECURITIES FUND) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinConvertibleSecuritiesFundUnlabeled Risk/Return Summary - (FRANKLIN CONVERTIBLE SECURITIES FUND) 4 false false R5.htm 00000008 - Disclosure - Risk/Return Detail Data - (FRANKLIN CONVERTIBLE SECURITIES FUND) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinConvertibleSecuritiesFundElements Risk/Return Detail Data - (FRANKLIN CONVERTIBLE SECURITIES FUND) 5 false false R6.htm 00000009 - Document - Risk/Return Summary - (FRANKLIN EQUITY INCOME FUND) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinEquityIncomeFundUnlabeled Risk/Return Summary - (FRANKLIN EQUITY INCOME FUND) 6 false false R7.htm 00000010 - Disclosure - Risk/Return Detail Data - (FRANKLIN EQUITY INCOME FUND) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinEquityIncomeFundElements Risk/Return Detail Data - (FRANKLIN EQUITY INCOME FUND) 7 false false R8.htm 00000011 - Document - Risk/Return Summary - (FRANKLIN REAL RETURN FUND) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinRealReturnFundUnlabeled Risk/Return Summary - (FRANKLIN REAL RETURN FUND) 8 false false R9.htm 00000012 - Disclosure - Risk/Return Detail Data - (FRANKLIN REAL RETURN FUND) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinRealReturnFundElements Risk/Return Detail Data - (FRANKLIN REAL RETURN FUND) 9 false false R10.htm 00000013 - Document - Risk/Return Summary - (FRANKLIN ADJUSTABLE U.S. GOVERNMENT SECURITIES FUND) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinAdjustableU.s.GovernmentSecuritiesFundUnlabeled Risk/Return Summary - (FRANKLIN ADJUSTABLE U.S. GOVERNMENT SECURITIES FUND) 10 false false R11.htm 00000014 - Disclosure - Risk/Return Detail Data - (FRANKLIN ADJUSTABLE U.S. GOVERNMENT SECURITIES FUND) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinAdjustableU.s.GovernmentSecuritiesFundElements Risk/Return Detail Data - (FRANKLIN ADJUSTABLE U.S. GOVERNMENT SECURITIES FUND) 11 false false R12.htm 00000015 - Document - Risk/Return Summary - (FRANKLIN FLOATING RATE DAILY ACCESS FUND) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinFloatingRateDailyAccessFundUnlabeled Risk/Return Summary - (FRANKLIN FLOATING RATE DAILY ACCESS FUND) 12 false false R13.htm 00000016 - Disclosure - Risk/Return Detail Data - (FRANKLIN FLOATING RATE DAILY ACCESS FUND) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinFloatingRateDailyAccessFundElements Risk/Return Detail Data - (FRANKLIN FLOATING RATE DAILY ACCESS FUND) 13 false false R14.htm 00000017 - Document - Risk/Return Summary - (FRANKLIN LOW DURATION TOTAL RETURN FUND) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinLowDurationTotalReturnFundUnlabeled Risk/Return Summary - (FRANKLIN LOW DURATION TOTAL RETURN FUND) 14 false false R15.htm 00000018 - Disclosure - Risk/Return Detail Data - (FRANKLIN LOW DURATION TOTAL RETURN FUND) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinLowDurationTotalReturnFundElements Risk/Return Detail Data - (FRANKLIN LOW DURATION TOTAL RETURN FUND) 15 false false R16.htm 00000019 - Document - Risk/Return Summary - (FRANKLIN TOTAL RETURN FUND) {Unlabeled} Sheet http://franklintempleton.com/role/RiskreturnSummary-FranklinTotalReturnFundUnlabeled Risk/Return Summary - (FRANKLIN TOTAL RETURN FUND) 16 false false R17.htm 00000020 - Disclosure - Risk/Return Detail Data - (FRANKLIN TOTAL RETURN FUND) {Elements} Sheet http://franklintempleton.com/role/RiskreturnDetailData-FranklinTotalReturnFundElements Risk/Return Detail Data - (FRANKLIN TOTAL RETURN FUND) 17 false false R18.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 18 false false All Reports Book All Reports fist-20170403.xml fist-20170403.xsd fist-20170403_def.xml fist-20170403_lab.xml fist-20170403_pre.xml true false