v3.26.3
Shareholder Report, Line Graph (Details) - USD ($)
12 Months Ended 108 Months Ended 132 Months Ended
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2026
C000130874_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 Commodity Total Return Index</span>
C000130874_0_BBIndexMember_AsOf_2016Member      
Account Value [Line Items]      
Accumulated Value $ 9,202    
C000130874_0_BBIndexMember_AsOf_2017Member      
Account Value [Line Items]      
Accumulated Value 9,273    
C000130874_0_BBIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 9,526    
C000130874_0_BBIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 9,015    
C000130874_0_BBIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 7,927    
C000130874_0_BBIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 11,120    
C000130874_0_BBIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 14,147    
C000130874_0_BBIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 13,032    
C000130874_0_BBIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 12,358    
C000130874_0_BBIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 13,558    
C000130874_0_BBIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 19,969    
C000130874_4_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;">MSCI ACWI (All Country World Index) Index</span>
C000130874_4_BBIndexMember_AsOf_2016Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000130874_4_BBIndexMember_AsOf_2017Member      
Account Value [Line Items]      
Accumulated Value 11,753    
C000130874_4_BBIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 13,092    
C000130874_4_BBIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 13,532    
C000130874_4_BBIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 14,564    
C000130874_4_BBIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 19,458    
C000130874_4_BBIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 17,474    
C000130874_4_BBIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 19,804    
C000130874_4_BBIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 23,253    
C000130874_4_BBIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 27,031    
C000130874_4_BBIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 33,101    
C000206762_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;">MSCI ACWI (All Country World Index) Index</span>  
C000206762_0_BBIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000206762_0_BBIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 11,820    
C000206762_0_BBIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 12,721    
C000206762_0_BBIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 16,996    
C000206762_0_BBIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 15,263    
C000206762_0_BBIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 17,298    
C000206762_0_BBIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 20,311    
C000206762_0_BBIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 23,610    
C000206762_0_BBIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 28,913    
C000175832_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 Commodity Total Return Index</span>
C000175832_0_BBIndexMember_AsOf_2017Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000175832_0_BBIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,161    
C000175832_0_BBIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 10,438    
C000175832_0_BBIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 9,879    
C000175832_0_BBIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 8,686    
C000175832_0_BBIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 12,185    
C000175832_0_BBIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 15,502    
C000175832_0_BBIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 14,280    
C000175832_0_BBIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 13,541    
C000175832_0_BBIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 14,857    
C000175832_0_BBIndexMember_AsOf_2016Member      
Account Value [Line Items]      
Accumulated Value 20,136    
C000175832_4_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;">MSCI ACWI (All Country World Index) Index</span>
C000175832_4_BBIndexMember_AsOf_2017Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000175832_4_BBIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,334    
C000175832_4_BBIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 11,511    
C000175832_4_BBIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 11,899    
C000175832_4_BBIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 12,806    
C000175832_4_BBIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 17,109    
C000175832_4_BBIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 15,365    
C000175832_4_BBIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 17,413    
C000175832_4_BBIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 20,446    
C000175832_4_BBIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 23,768    
C000175832_4_BBIndexMember_AsOf_2016Member      
Account Value [Line Items]      
Accumulated Value 29,105    
C000130874_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 Commodity Strategy Fund</span>
C000130874_ClassMember_AsOf_2016Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000130874_ClassMember_AsOf_2017Member      
Account Value [Line Items]      
Accumulated Value 10,038    
C000130874_ClassMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,266    
C000130874_ClassMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 9,667    
C000130874_ClassMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 8,534    
C000130874_ClassMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 11,932    
C000130874_ClassMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 15,096    
C000130874_ClassMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 13,845    
C000130874_ClassMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 13,151    
C000130874_ClassMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 14,366    
C000130874_ClassMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 18,465    
C000130874_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 Commodity Strategy Linked Index</span>
C000130874_1_AdditionalIndexMember_AsOf_2016Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000130874_1_AdditionalIndexMember_AsOf_2017Member      
Account Value [Line Items]      
Accumulated Value 10,077    
C000130874_1_AdditionalIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,352    
C000130874_1_AdditionalIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 9,797    
C000130874_1_AdditionalIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 8,614    
C000130874_1_AdditionalIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 12,084    
C000130874_1_AdditionalIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 15,374    
C000130874_1_AdditionalIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 14,162    
C000130874_1_AdditionalIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 13,429    
C000130874_1_AdditionalIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 14,734    
C000130874_1_AdditionalIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 18,904    
C000130874_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 Commodity 3 Month Forward Total Return Index</span>
C000130874_2_AdditionalIndexMember_AsOf_2016Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000130874_2_AdditionalIndexMember_AsOf_2017Member      
Account Value [Line Items]      
Accumulated Value 10,250    
C000130874_2_AdditionalIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,750    
C000130874_2_AdditionalIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 10,237    
C000130874_2_AdditionalIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 9,671    
C000130874_2_AdditionalIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 13,744    
C000130874_2_AdditionalIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 18,015    
C000130874_2_AdditionalIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 17,196    
C000130874_2_AdditionalIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 16,736    
C000130874_2_AdditionalIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 18,294    
C000130874_2_AdditionalIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 23,489    
C000206762_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;">Fidelity® SAI Inflation-Focused Fund</span>  
C000206762_ClassMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000206762_ClassMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 10,350    
C000206762_ClassMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 9,518    
C000206762_ClassMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 13,953    
C000206762_ClassMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 17,787    
C000206762_ClassMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 15,330    
C000206762_ClassMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 14,713    
C000206762_ClassMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 15,736    
C000206762_ClassMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 23,154    
C000206762_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 Commodity Linked Index℠</span>  
C000206762_1_AdditionalIndexMember_AsOf_2018Member      
Account Value [Line Items]      
Accumulated Value 10,000    
C000206762_1_AdditionalIndexMember_AsOf_2019Member      
Account Value [Line Items]      
Accumulated Value 10,166    
C000206762_1_AdditionalIndexMember_AsOf_2020Member      
Account Value [Line Items]      
Accumulated Value 8,938    
C000206762_1_AdditionalIndexMember_AsOf_2021Member      
Account Value [Line Items]      
Accumulated Value 12,538    
C000206762_1_AdditionalIndexMember_AsOf_2022Member      
Account Value [Line Items]      
Accumulated Value 15,952    
C000206762_1_AdditionalIndexMember_AsOf_2023Member      
Account Value [Line Items]      
Accumulated Value 14,695    
C000206762_1_AdditionalIndexMember_AsOf_2024Member      
Account Value [Line Items]      
Accumulated Value 13,960    
C000206762_1_AdditionalIndexMember_AsOf_2025Member      
Account Value [Line Items]      
Accumulated Value 15,087    
C000206762_1_AdditionalIndexMember_AsOf_2026Member      
Account Value [Line Items]      
Accumulated Value 22,597    
C000206762_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 Commodity 50/50 Petroleum and ex-Petroleum Index</span>  
C000206762_2_AdditionalIndexMember_AsOf_2018Member      
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Accumulated Value 10,000    
C000206762_2_AdditionalIndexMember_AsOf_2019Member      
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Accumulated Value 10,853    
C000206762_2_AdditionalIndexMember_AsOf_2020Member      
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Accumulated Value 8,465    
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Accumulated Value 13,070    
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Accumulated Value 18,527    
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Accumulated Value 17,509    
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Accumulated Value 17,373    
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Accumulated Value 18,775    
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Account Value [Line Items]      
Accumulated Value 28,120    
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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;">Fidelity® Commodity Strategy Fund</span>
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Accumulated Value 10,150    
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Accumulated Value 10,329    
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Accumulated Value 9,675    
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Accumulated Value 11,820    
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Accumulated Value 13,505    
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Accumulated Value 12,769    
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Accumulated Value 13,863    
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Accumulated Value 17,698    
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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 Commodity Strategy Linked Index</span>
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Accumulated Value 14,280    
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Accumulated Value 14,857    
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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 Commodity 3 Month Forward Total Return Index</span>
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