v3.26.1
Shareholder Report, Line Graph (Details) - USD ($)
12 Months Ended 60 Months Ended 72 Months Ended 96 Months Ended 108 Months Ended 132 Months Ended
Apr. 30, 2026
Apr. 30, 2026
Apr. 30, 2026
Apr. 30, 2026
Apr. 30, 2026
Apr. 30, 2026
C000132244_0_LG_BBIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000132244_0_BBIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value $ 10,000          
C000132244_0_BBIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000132244_0_BBIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000132244_0_BBIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000132244_0_BBIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000132244_0_BBIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000132244_0_BBIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000132244_0_BBIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,892          
C000132244_0_BBIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000132244_0_BBIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,739          
C000132244_0_BBIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 12,278          
C000205018_0_LG_BBIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>  
C000205018_0_BBIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000205018_0_BBIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,464          
C000205018_0_BBIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,422          
C000205018_0_BBIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,625          
C000205018_0_BBIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,629          
C000205018_0_BBIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,596          
C000205018_0_BBIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,560          
C000205018_0_BBIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,420          
C000205018_0_BBIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 11,945          
C000132247_0_LG_BBIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000132247_0_BBIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132247_0_BBIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000132247_0_BBIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000132247_0_BBIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000132247_0_BBIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000132247_0_BBIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000132247_0_BBIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000132247_0_BBIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,892          
C000132247_0_BBIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000132247_0_BBIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,739          
C000132247_0_BBIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 12,278          
C000132245_0_LG_BBIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000132245_0_BBIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132245_0_BBIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000132245_0_BBIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000132245_0_BBIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000132245_0_BBIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000132245_0_BBIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000132245_0_BBIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000132245_0_BBIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,892          
C000132245_0_BBIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000132245_0_BBIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,739          
C000132245_0_BBIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 12,278          
C000132248_0_LG_BBIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000132248_0_BBIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132248_0_BBIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000132248_0_BBIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000132248_0_BBIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000132248_0_BBIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000132248_0_BBIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000132248_0_BBIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000132248_0_BBIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,892          
C000132248_0_BBIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000132248_0_BBIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,739          
C000132248_0_BBIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 12,278          
C000132246_0_LG_BBIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000132246_0_BBIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132246_0_BBIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000132246_0_BBIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000132246_0_BBIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000132246_0_BBIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000132246_0_BBIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000132246_0_BBIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000132246_0_BBIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,892          
C000132246_0_BBIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000132246_0_BBIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,739          
C000132246_0_BBIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 12,278          
C000211260_LG_ClassMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Women's Leadership Fund</span>    
C000211260_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000211260_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,837          
C000211260_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 15,389          
C000211260_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,657          
C000211260_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,981          
C000211260_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 16,604          
C000211260_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 16,784          
C000211260_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 23,239          
C000211260_LG_1_AdditionalIndexMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI USA Women's Leadership Index</span>    
C000211260_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000211260_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,399          
C000211260_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 14,585          
C000211260_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,499          
C000211260_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,031          
C000211260_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 15,104          
C000211260_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,610          
C000211260_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,118          
C000211260_LG_2_AdditionalIndexMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>    
C000211260_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000211260_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,973          
C000211260_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 15,051          
C000211260_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 14,582          
C000211260_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 14,801          
C000211260_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 18,102          
C000211260_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 20,166          
C000211260_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 26,419          
C000211258_LG_ClassMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span>    
C000211258_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000211258_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,857          
C000211258_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 15,439          
C000211258_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,721          
C000211258_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 14,077          
C000211258_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 16,754          
C000211258_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 16,950          
C000211258_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 23,502          
C000211258_LG_1_AdditionalIndexMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI USA Women's Leadership Index</span>    
C000211258_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000211258_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,399          
C000211258_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 14,585          
C000211258_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,499          
C000211258_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,031          
C000211258_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 15,104          
C000211258_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,610          
C000211258_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,118          
C000211258_LG_2_AdditionalIndexMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>    
C000211258_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000211258_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,973          
C000211258_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 15,051          
C000211258_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 14,582          
C000211258_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 14,801          
C000211258_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 18,102          
C000211258_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 20,166          
C000211258_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 26,419          
C000211261_LG_ClassMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span>    
C000211261_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 9,650          
C000211261_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,445          
C000211261_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 14,702          
C000211261_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 12,987          
C000211261_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,225          
C000211261_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 15,634          
C000211261_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,714          
C000211261_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 21,646          
C000211261_LG_1_AdditionalIndexMember_8YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI USA Women's Leadership Index</span>    
C000211261_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000211261_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,399          
C000211261_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 14,585          
C000211261_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,499          
C000211261_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,031          
C000211261_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 15,104          
C000211261_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,610          
C000211261_1_AdditionalIndexMember_AsOf_2026Member            
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Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>    
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Accumulated Value 10,000          
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Account Value [Line Items]            
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C000211259_ClassMember_AsOf_2020Member            
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C000211259_ClassMember_AsOf_2025Member            
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Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI USA Women's Leadership Index</span>    
C000211259_1_AdditionalIndexMember_AsOf_2019Member            
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Line Graph and Table Measure Name       <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Russell 3000® Index</span>    
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Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® 1-5 Year BB-B US Cash Pay High Yield Constrained Index</span>
C000132244_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132244_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,999          
C000132244_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,373          
C000132244_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,091          
C000132244_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,496          
C000132244_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,369          
C000132244_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,139          
C000132244_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,444          
C000132244_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,568          
C000132244_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,636          
C000132244_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,900          
C000205018_LG_ClassMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span>  
C000205018_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000205018_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,267          
C000205018_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,037          
C000205018_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,162          
C000205018_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,909          
C000205018_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,048          
C000205018_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,985          
C000205018_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,824          
C000205018_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,059          
C000205018_LG_1_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Short Duration High Income Fund Composite Index℠</span>  
C000205018_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000205018_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,334          
C000205018_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,902          
C000205018_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,501          
C000205018_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,384          
C000205018_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,672          
C000205018_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,717          
C000205018_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,628          
C000205018_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,693          
C000205018_LG_2_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® 1-5 Year BB-B US Cash Pay High Yield Constrained Index</span>  
C000205018_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000205018_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,345          
C000205018_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,836          
C000205018_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,439          
C000205018_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,242          
C000205018_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,503          
C000205018_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,464          
C000205018_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,378          
C000205018_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,460          
C000132247_LG_ClassMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span>
C000132247_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 9,600          
C000132247_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,449          
C000132247_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,695          
C000132247_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 11,179          
C000132247_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,890          
C000132247_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 12,084          
C000132247_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,770          
C000132247_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,879          
C000132247_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,829          
C000132247_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,682          
C000132247_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,962          
C000132247_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Short Duration High Income Fund Composite Index℠</span>
C000132247_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132247_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,899          
C000132247_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,248          
C000132247_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 11,920          
C000132247_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,423          
C000132247_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,267          
C000132247_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,132          
C000132247_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,464          
C000132247_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,670          
C000132247_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,721          
C000132247_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,949          
C000132247_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® 1-5 Year BB-B US Cash Pay High Yield Constrained Index</span>
C000132247_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132247_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,999          
C000132247_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,373          
C000132247_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,091          
C000132247_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,496          
C000132247_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,369          
C000132247_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,139          
C000132247_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,444          
C000132247_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,568          
C000132247_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,636          
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Account Value [Line Items]            
Accumulated Value 16,900          
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Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span>
C000132245_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132245_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,899          
C000132245_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,184          
C000132245_ClassMember_AsOf_2019Member            
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Accumulated Value 11,719          
C000132245_ClassMember_AsOf_2020Member            
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Accumulated Value 11,458          
C000132245_ClassMember_AsOf_2021Member            
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Accumulated Value 12,731          
C000132245_ClassMember_AsOf_2022Member            
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Accumulated Value 12,431          
C000132245_ClassMember_AsOf_2023Member            
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Accumulated Value 12,578          
C000132245_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 13,634          
C000132245_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,560          
C000132245_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 15,963          
C000132245_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Short Duration High Income Fund Composite Index℠</span>
C000132245_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132245_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,899          
C000132245_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,248          
C000132245_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 11,920          
C000132245_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,423          
C000132245_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,267          
C000132245_1_AdditionalIndexMember_AsOf_2022Member            
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Accumulated Value 13,132          
C000132245_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,464          
C000132245_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,670          
C000132245_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,721          
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Account Value [Line Items]            
Accumulated Value 16,949          
C000132245_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® 1-5 Year BB-B US Cash Pay High Yield Constrained Index</span>
C000132245_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132245_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,999          
C000132245_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,373          
C000132245_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,091          
C000132245_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,496          
C000132245_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,369          
C000132245_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,139          
C000132245_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,444          
C000132245_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,568          
C000132245_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,636          
C000132245_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,900          
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Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span>
C000132248_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132248_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,792          
C000132248_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,964          
C000132248_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 11,374          
C000132248_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,010          
C000132248_ClassMember_AsOf_2021Member            
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Accumulated Value 12,112          
C000132248_ClassMember_AsOf_2022Member            
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Accumulated Value 11,710          
C000132248_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,730          
C000132248_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,588          
C000132248_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,410          
C000132248_ClassMember_AsOf_2026Member            
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Accumulated Value 14,664          
C000132248_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Short Duration High Income Fund Composite Index℠</span>
C000132248_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132248_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,899          
C000132248_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,248          
C000132248_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 11,920          
C000132248_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,423          
C000132248_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,267          
C000132248_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
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C000132248_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
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C000132248_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,670          
C000132248_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,721          
C000132248_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,949          
C000132248_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® 1-5 Year BB-B US Cash Pay High Yield Constrained Index</span>
C000132248_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132248_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,999          
C000132248_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,373          
C000132248_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,091          
C000132248_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
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C000132248_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
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C000132248_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,139          
C000132248_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,444          
C000132248_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,568          
C000132248_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,636          
C000132248_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,900          
C000132246_LG_ClassMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span>
C000132246_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 9,600          
C000132246_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,449          
C000132246_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,695          
C000132246_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 11,179          
C000132246_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,902          
C000132246_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 12,084          
C000132246_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,770          
C000132246_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,879          
C000132246_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,843          
C000132246_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,681          
C000132246_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,961          
C000132246_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Short Duration High Income Fund Composite Index℠</span>
C000132246_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132246_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,899          
C000132246_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,248          
C000132246_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 11,920          
C000132246_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,423          
C000132246_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,267          
C000132246_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,132          
C000132246_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,464          
C000132246_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,670          
C000132246_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,721          
C000132246_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,949          
C000132246_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® 1-5 Year BB-B US Cash Pay High Yield Constrained Index</span>
C000132246_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000132246_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,999          
C000132246_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,373          
C000132246_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,091          
C000132246_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,496          
C000132246_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,369          
C000132246_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,139          
C000132246_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,444          
C000132246_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,568          
C000132246_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,636          
C000132246_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,900          
C000098085_LG_ClassMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Series High Income Fund</span>
C000098085_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000098085_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 11,425          
C000098085_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 12,005          
C000098085_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,740          
C000098085_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 12,216          
C000098085_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 14,259          
C000098085_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,939          
C000098085_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,997          
C000098085_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 15,091          
C000098085_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 16,462          
C000098085_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,576          
C000098085_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>
C000098085_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000098085_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 11,365          
C000098085_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,731          
C000098085_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,518          
C000098085_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,858          
C000098085_1_AdditionalIndexMember_AsOf_2021Member            
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Accumulated Value 14,230          
C000098085_1_AdditionalIndexMember_AsOf_2022Member            
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Accumulated Value 13,525          
C000098085_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,665          
C000098085_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,879          
C000098085_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 16,172          
C000098085_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 17,581          
C000098085_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000098085_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000098085_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000098085_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000098085_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000098085_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000098085_2_AdditionalIndexMember_AsOf_2021Member            
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C000098085_2_AdditionalIndexMember_AsOf_2022Member            
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C000098085_2_AdditionalIndexMember_AsOf_2023Member            
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C000098085_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000098085_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
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C000098085_2_AdditionalIndexMember_AsOf_2026Member            
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Accumulated Value 12,278          
C000227362_LG_ClassMember_6YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name     <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® SAI High Income Fund</span>      
C000227362_ClassMember_AsOf_2021Member            
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Accumulated Value 10,000          
C000227362_ClassMember_AsOf_2022Member            
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Accumulated Value 9,490          
C000227362_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 9,484          
C000227362_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,247          
C000227362_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,170          
C000227362_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
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C000227362_LG_1_AdditionalIndexMember_6YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name     <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>      
C000227362_1_AdditionalIndexMember_AsOf_2021Member            
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C000227362_1_AdditionalIndexMember_AsOf_2022Member            
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C000227362_1_AdditionalIndexMember_AsOf_2023Member            
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C000227362_1_AdditionalIndexMember_AsOf_2024Member            
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Accumulated Value 10,466          
C000227362_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,375          
C000227362_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
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C000227362_LG_2_AdditionalIndexMember_6YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name     <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>      
C000227362_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000227362_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 9,166          
C000227362_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 9,137          
C000227362_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 9,106          
C000227362_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 9,848          
C000227362_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 10,300          
C000048886_LG_ClassMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® High Income Fund</span>
C000048886_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000048886_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 11,356          
C000048886_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,841          
C000048886_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,532          
C000048886_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,861          
C000048886_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,627          
C000048886_ClassMember_AsOf_2022Member            
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Accumulated Value 12,981          
C000048886_ClassMember_AsOf_2023Member            
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Accumulated Value 12,845          
C000048886_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 13,932          
C000048886_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,138          
C000048886_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,958          
C000048886_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>
C000048886_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000048886_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 11,365          
C000048886_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,731          
C000048886_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,518          
C000048886_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,858          
C000048886_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 14,230          
C000048886_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,525          
C000048886_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,665          
C000048886_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,879          
C000048886_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 16,172          
C000048886_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 17,581          
C000048886_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000048886_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000048886_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000048886_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000048886_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000048886_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000048886_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000048886_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000048886_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,892          
C000048886_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000048886_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,739          
C000048886_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 12,278          
C000206226_LG_ClassMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span>  
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Account Value [Line Items]            
Accumulated Value 10,000          
C000206226_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,583          
C000206226_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,023          
C000206226_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,522          
C000206226_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,983          
C000206226_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,876          
C000206226_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,804          
C000206226_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,817          
C000206226_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,367          
C000206226_LG_1_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>  
C000206226_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206226_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,620          
C000206226_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,060          
C000206226_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 12,073          
C000206226_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,474          
C000206226_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,593          
C000206226_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,623          
C000206226_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,720          
C000206226_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,916          
C000206226_LG_2_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>  
C000206226_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206226_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,458          
C000206226_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,415          
C000206226_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,618          
C000206226_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,623          
C000206226_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,589          
C000206226_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,554          
C000206226_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,413          
C000206226_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 11,937          
C000206223_LG_ClassMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span>  
C000206223_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 9,600          
C000206223_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,145          
C000206223_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,573          
C000206223_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 10,966          
C000206223_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,414          
C000206223_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,275          
C000206223_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,112          
C000206223_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,024          
C000206223_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 13,431          
C000206223_LG_1_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>  
C000206223_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206223_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,620          
C000206223_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,060          
C000206223_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 12,073          
C000206223_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,474          
C000206223_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,593          
C000206223_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,623          
C000206223_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,720          
C000206223_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,916          
C000206223_LG_2_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>  
C000206223_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206223_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,458          
C000206223_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,415          
C000206223_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,618          
C000206223_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,623          
C000206223_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,589          
C000206223_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,554          
C000206223_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,413          
C000206223_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 11,937          
C000206225_LG_ClassMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span>  
C000206225_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206225_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,577          
C000206225_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,006          
C000206225_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,492          
C000206225_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,953          
C000206225_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,831          
C000206225_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,736          
C000206225_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,731          
C000206225_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,274          
C000206225_LG_1_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>  
C000206225_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206225_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,620          
C000206225_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,060          
C000206225_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 12,073          
C000206225_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,474          
C000206225_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,593          
C000206225_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,623          
C000206225_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,720          
C000206225_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,916          
C000206225_LG_2_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>  
C000206225_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206225_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,458          
C000206225_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,415          
C000206225_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,618          
C000206225_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,623          
C000206225_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,589          
C000206225_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,554          
C000206225_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,413          
C000206225_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 11,937          
C000206224_LG_ClassMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span>  
C000206224_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206224_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,536          
C000206224_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,867          
C000206224_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,217          
C000206224_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,571          
C000206224_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,350          
C000206224_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,108          
C000206224_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,930          
C000206224_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 13,244          
C000206224_LG_1_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>  
C000206224_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206224_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,620          
C000206224_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,060          
C000206224_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 12,073          
C000206224_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,474          
C000206224_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,593          
C000206224_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,623          
C000206224_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,720          
C000206224_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,916          
C000206224_LG_2_AdditionalIndexMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>  
C000206224_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206224_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,458          
C000206224_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,415          
C000206224_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,618          
C000206224_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,623          
C000206224_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,589          
C000206224_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,554          
C000206224_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,413          
C000206224_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 11,937          
C000206227_LG_ClassMember_9YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span>  
C000206227_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 9,600          
C000206227_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,146          
C000206227_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 9,575          
C000206227_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 10,969          
C000206227_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,418          
C000206227_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,280          
C000206227_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,117          
C000206227_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,030          
C000206227_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 13,454          
C000206227_LG_1_AdditionalIndexMember_9YRMember            
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Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>  
C000206227_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206227_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,620          
C000206227_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 10,060          
C000206227_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
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C000206227_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 11,474          
C000206227_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 11,593          
C000206227_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,623          
C000206227_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,720          
C000206227_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
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C000206227_LG_2_AdditionalIndexMember_9YRMember            
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Line Graph and Table Measure Name         <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>  
C000206227_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000206227_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,458          
C000206227_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,415          
C000206227_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,618          
C000206227_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,623          
C000206227_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,589          
C000206227_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,554          
C000206227_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,413          
C000206227_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
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C000235371_LG_ClassMember_5YRMember            
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Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Healthy Future Fund</span>        
C000235371_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235371_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,590          
C000235371_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,979          
C000235371_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,582          
C000235371_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,418          
C000235371_LG_1_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World Health & Wellness Select Index</span>        
C000235371_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235371_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,562          
C000235371_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,930          
C000235371_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,118          
C000235371_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,897          
C000235371_LG_2_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI ACWI (All Country World Index) Index</span>        
C000235371_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235371_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,675          
C000235371_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,583          
C000235371_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,118          
C000235371_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,549          
C000235369_LG_ClassMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span>        
C000235369_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235369_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,610          
C000235369_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,009          
C000235369_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,630          
C000235369_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,500          
C000235369_LG_1_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World Health & Wellness Select Index</span>        
C000235369_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235369_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,562          
C000235369_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,930          
C000235369_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,118          
C000235369_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,897          
C000235369_LG_2_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI ACWI (All Country World Index) Index</span>        
C000235369_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235369_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,675          
C000235369_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,583          
C000235369_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,118          
C000235369_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,549          
C000235372_LG_ClassMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span>        
C000235372_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 9,650          
C000235372_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,171          
C000235372_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,445          
C000235372_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,966          
C000235372_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 13,643          
C000235372_LG_1_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World Health & Wellness Select Index</span>        
C000235372_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235372_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,562          
C000235372_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,930          
C000235372_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,118          
C000235372_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,897          
C000235372_LG_2_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI ACWI (All Country World Index) Index</span>        
C000235372_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235372_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,675          
C000235372_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,583          
C000235372_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,118          
C000235372_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,549          
C000235370_LG_ClassMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span>        
C000235370_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235370_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,590          
C000235370_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,979          
C000235370_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,578          
C000235370_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,417          
C000235370_LG_1_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World Health & Wellness Select Index</span>        
C000235370_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235370_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,562          
C000235370_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,930          
C000235370_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,118          
C000235370_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,897          
C000235370_LG_2_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI ACWI (All Country World Index) Index</span>        
C000235370_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235370_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,675          
C000235370_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,583          
C000235370_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,118          
C000235370_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,549          
C000235374_LG_ClassMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span>        
C000235374_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235374_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,490          
C000235374_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,750          
C000235374_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 12,210          
C000235374_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 13,856          
C000235374_LG_1_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World Health & Wellness Select Index</span>        
C000235374_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235374_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,562          
C000235374_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,930          
C000235374_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,118          
C000235374_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
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C000235374_LG_2_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI ACWI (All Country World Index) Index</span>        
C000235374_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235374_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,675          
C000235374_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,583          
C000235374_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,118          
C000235374_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,549          
C000235373_LG_ClassMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span>        
C000235373_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 9,425          
C000235373_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 9,962          
C000235373_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,235          
C000235373_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,772          
C000235373_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 13,451          
C000235373_LG_1_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World Health & Wellness Select Index</span>        
C000235373_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235373_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,562          
C000235373_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 11,930          
C000235373_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 13,118          
C000235373_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 14,897          
C000235373_LG_2_AdditionalIndexMember_5YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name   <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI ACWI (All Country World Index) Index</span>        
C000235373_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000235373_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,675          
C000235373_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 12,583          
C000235373_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,118          
C000235373_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 18,549          
C000048885_LG_ClassMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Focused High Income Fund</span>
C000048885_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000048885_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 11,022          
C000048885_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,226          
C000048885_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,036          
C000048885_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 12,017          
C000048885_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 13,357          
C000048885_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 12,501          
C000048885_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 12,740          
C000048885_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 13,511          
C000048885_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 14,502          
C000048885_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 15,797          
C000048885_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® BB US High Yield Constrained Index</span>
C000048885_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000048885_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
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C000048885_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,226          
C000048885_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,045          
C000048885_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 12,038          
C000048885_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
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C000048885_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,180          
C000048885_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,456          
C000048885_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,441          
C000048885_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 15,557          
C000048885_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 16,863          
C000048885_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000048885_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000048885_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000048885_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000048885_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000048885_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000048885_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000048885_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000048885_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
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C000048885_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000048885_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
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C000048885_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 12,278          
C000020469_LG_ClassMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Capital & Income Fund</span>
C000020469_ClassMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000020469_ClassMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 11,385          
C000020469_ClassMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 12,012          
C000020469_ClassMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,821          
C000020469_ClassMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,938          
C000020469_ClassMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 15,801          
C000020469_ClassMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 15,284          
C000020469_ClassMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 15,604          
C000020469_ClassMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 17,307          
C000020469_ClassMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 18,499          
C000020469_ClassMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 22,179          
C000020469_LG_1_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>
C000020469_1_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000020469_1_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 11,365          
C000020469_1_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 11,731          
C000020469_1_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 12,518          
C000020469_1_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,858          
C000020469_1_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 14,230          
C000020469_1_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 13,525          
C000020469_1_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 13,665          
C000020469_1_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 14,879          
C000020469_1_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 16,172          
C000020469_1_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value 17,581          
C000020469_LG_2_AdditionalIndexMember_11YRMember            
Account Value [Line Items]            
Line Graph and Table Measure Name           <span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
C000020469_2_AdditionalIndexMember_AsOf_2016Member            
Account Value [Line Items]            
Accumulated Value 10,000          
C000020469_2_AdditionalIndexMember_AsOf_2017Member            
Account Value [Line Items]            
Accumulated Value 10,207          
C000020469_2_AdditionalIndexMember_AsOf_2018Member            
Account Value [Line Items]            
Accumulated Value 10,208          
C000020469_2_AdditionalIndexMember_AsOf_2019Member            
Account Value [Line Items]            
Accumulated Value 10,757          
C000020469_2_AdditionalIndexMember_AsOf_2020Member            
Account Value [Line Items]            
Accumulated Value 11,741          
C000020469_2_AdditionalIndexMember_AsOf_2021Member            
Account Value [Line Items]            
Accumulated Value 11,950          
C000020469_2_AdditionalIndexMember_AsOf_2022Member            
Account Value [Line Items]            
Accumulated Value 10,926          
C000020469_2_AdditionalIndexMember_AsOf_2023Member            
Account Value [Line Items]            
Accumulated Value 10,892          
C000020469_2_AdditionalIndexMember_AsOf_2024Member            
Account Value [Line Items]            
Accumulated Value 10,855          
C000020469_2_AdditionalIndexMember_AsOf_2025Member            
Account Value [Line Items]            
Accumulated Value 11,739          
C000020469_2_AdditionalIndexMember_AsOf_2026Member            
Account Value [Line Items]            
Accumulated Value $ 12,278