v3.26.3
Shareholder Report, Holdings (Details)
Jul. 31, 2026
Fidelity Series Commodity Strategy Fund | MSIndustrialMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 27.40%
Fidelity Series Commodity Strategy Fund | MSPreciousMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
Fidelity Series Commodity Strategy Fund | MSLivestockSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Series Commodity Strategy Fund | Agricultural Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 24.60%
Fidelity Series Commodity Strategy Fund | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 31.70%
Fidelity Series Commodity Strategy Fund | DEFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Asset Value 41.90%
Fidelity Series Commodity Strategy Fund | DESwapsMember  
Holdings [Line Items]  
Percent of Net Asset Value 74.40%
Fidelity Series Commodity Strategy Fund | AASwapsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 34.30%
Fidelity Series Commodity Strategy Fund | AAFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 19.50%
Fidelity Series Commodity Strategy Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Long Exposure 46.20%
Fidelity SAI Inflation-Focused Fund | MSIndustrialMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
Fidelity SAI Inflation-Focused Fund | MSPreciousMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity SAI Inflation-Focused Fund | MSLivestockSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity SAI Inflation-Focused Fund | Agricultural Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
Fidelity SAI Inflation-Focused Fund | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 57.70%
Fidelity SAI Inflation-Focused Fund | DEFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Asset Value 100.90%
Fidelity SAI Inflation-Focused Fund | AAFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 50.20%
Fidelity SAI Inflation-Focused Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Long Exposure 49.80%
Fidelity Commodity Strategy Fund | MSIndustrialMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 25.50%
Fidelity Commodity Strategy Fund | MSPreciousMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Fidelity Commodity Strategy Fund | MSLivestockSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Commodity Strategy Fund | Agricultural Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 25.20%
Fidelity Commodity Strategy Fund | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 32.40%
Fidelity Commodity Strategy Fund | DEFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Asset Value 37.80%
Fidelity Commodity Strategy Fund | DESwapsMember  
Holdings [Line Items]  
Percent of Net Asset Value 75.90%
Fidelity Commodity Strategy Fund | AASwapsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 35.60%
Fidelity Commodity Strategy Fund | AAFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 17.50%
Fidelity Commodity Strategy Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Long Exposure 46.90%