3.19.3.a.u2 html 28 174 1 true 16 0 false 4 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.proofPlus.com/role/DocumentInformation Document and Entity Information 1 false true R2.htm 000001 - Document - Risk/Return Summary {Unlabeled} - Fidelity Strategic Real Return Fund Sheet http://www.proofPlus.com/role/SummaryS000017675_D0930FidelityStrategicRealReturnFundAMCIZPRO14 Risk/Return Summary- Fidelity Strategic Real Return Fund 2 false false R9.htm 000009 - Disclosure - Risk/Return Detail Data {Elements} - Fidelity Strategic Real Return Fund Sheet http://www.proofPlus.com/role/DisclosureDetailS000017675_D0930FidelityStrategicRealReturnFundAMCIZPRO14 Risk/Return Detail Data- Fidelity Strategic Real Return Fund 3 false true R10.htm 000010 - Document - Risk/Return Summary {Unlabeled} - Fidelity Strategic Real Return Fund Sheet http://www.proofPlus.com/role/SummaryS000017675_D0930FidelityStrategicRealReturnFundRetailPRO09 Risk/Return Summary- Fidelity Strategic Real Return Fund 4 false false R16.htm 000018 - Disclosure - Risk/Return Detail Data {Elements} - Fidelity Strategic Real Return Fund Sheet http://www.proofPlus.com/role/DisclosureDetailS000017675_D0930FidelityStrategicRealReturnFundRetailPRO09 Risk/Return Detail Data- Fidelity Strategic Real Return Fund 5 false true R17.htm 000019 - Document - Risk/Return Summary {Unlabeled} - Fidelity Strategic Real Return Fund Sheet http://www.proofPlus.com/role/SummaryS000017675_NF0930FidelityStrategicRealReturnFundClassK6Pro02 Risk/Return Summary- Fidelity Strategic Real Return Fund 6 false false R23.htm 000027 - Disclosure - Risk/Return Detail Data {Elements} - Fidelity Strategic Real Return Fund Sheet http://www.proofPlus.com/role/DisclosureDetailS000017675_NF0930FidelityStrategicRealReturnFundClassK6Pro02 Risk/Return Detail Data- Fidelity Strategic Real Return Fund 7 false false R24.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 8 false false All Reports Book All Reports cgk-20191217.xml cgk-20191217.xsd cgk-20191217_cal.xml cgk-20191217_def.xml cgk-20191217_lab.xml cgk-20191217_pre.xml BarChart1.png BarChart2.png BarChart3.png http://xbrl.sec.gov/dei/2018-01-31 http://xbrl.sec.gov/rr/2018-01-31 true true