v3.26.3
Shareholder Report, Holdings (Details)
Jul. 31, 2026
Fidelity SAI Alternative Risk Premia Currency Strategy Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 88.60%
Fidelity SAI Alternative Risk Premia Currency Strategy Fund | DESwapsMember  
Holdings [Line Items]  
Percent of Net Asset Value 193.70%
Fidelity SAI Alternative Risk Premia Currency Strategy Fund | DEForwardForeignCurrencyContractsMember  
Holdings [Line Items]  
Percent of Net Asset Value 213.60%
Fidelity SAI Alternative Risk Premia Currency Strategy Fund | AAForwardForeignCurrencyContractsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 42.10%
Fidelity SAI Alternative Risk Premia Currency Strategy Fund | AASwapsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 38.20%
Fidelity SAI Alternative Risk Premia Currency Strategy Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Long Exposure 19.70%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | MSIndustrialMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 37.80%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | MSPreciousMetalsSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | MSLivestockSectorMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | Agricultural Sector Member  
Holdings [Line Items]  
Percent of Net Asset Value 27.90%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | Energy Sector  
Holdings [Line Items]  
Percent of Net Asset Value 22.60%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | DESwapsMember  
Holdings [Line Items]  
Percent of Net Asset Value 188.20%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | AASwapsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 36.20%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Long Exposure 19.30%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | DEFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Asset Value 231.10%
Fidelity SAI Alternative Risk Premia Commodity Strategy Fund | AAFuturesContractsMember  
Holdings [Line Items]  
Percent of Net Long Exposure 44.50%