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Shareholder Report
 6 Months Ended
Jan. 31, 2026
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Oxford Street Trust
Entity Central Index Key 0000028540
Entity Investment Company Type N-1A
Document Period End Date Jan. 31, 2026
Fidelity Series Commodity Strategy Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Series Commodity Strategy Fund
Class Name Fidelity® Series Commodity Strategy Fund
Trading Symbol FCSSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Series Commodity Strategy Fund for the period August 1, 2025 to January 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544.
Additional Information Phone Number 1-800-544-8544
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Series Commodity Strategy Fund 
$ 0 A
0.00%B
  
A Amount represents less than $.50
B Amount represents less than 0.005%
 
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Net Assets $ 2,499,726,481
Holdings Count | shares 76
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,499,726,481
  
Number of Holdings
76
  
Portfolio Turnover
0%
  
Holdings [Text Block] Energy 32.1 Agriculture 25.8 Industrial Metals 19.4 Precious Metals 17.5 Livestock 5.2 COMMODITY SECTOR DIVERSIFICATION (% of Fund's net assets)   Energy - 32.1                              Agriculture - 25.8                         Industrial Metals - 19.4                   Precious Metals - 17.5                     Livestock - 5.2                            DERIVATIVE EXPOSURE (% of Fund's net assets)     Futures Contracts 26.3   Swaps 72.5           Swaps 36.5 Futures Contracts 13.2 Short-Term Investments and Net Other Assets (Liabilities) 50.3 ASSET ALLOCATION (% of Fund's total exposure)     Swaps - 36.5                               Futures Contracts - 13.2                   Short-Term Investments and Net Other Assets (Liabilities) - 50.3  
Fidelity SAI Inflation-Focused Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® SAI Inflation-Focused Fund
Class Name Fidelity® SAI Inflation-Focused Fund
Trading Symbol FIFGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® SAI Inflation-Focused Fund for the period August 1, 2025 to January 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-3455
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® SAI Inflation-Focused Fund 
$ 21 
0.38%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.38%
Net Assets $ 4,882,241,030
Holdings Count | shares 70
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,882,241,030
  
Number of Holdings
70
  
Portfolio Turnover
0%
  
Holdings [Text Block] Energy 48.4 Industrial Metals 23.4 Agriculture 14.8 Precious Metals 10.5 Livestock 2.9 COMMODITY SECTOR DIVERSIFICATION (% of Fund's net assets)   Energy - 48.4                              Industrial Metals - 23.4                   Agriculture - 14.8                         Precious Metals - 10.5                     Livestock - 2.9                            DERIVATIVE EXPOSURE (% of Fund's net assets)     Futures Contracts 118.0           Futures Contracts 54.1 Short-Term Investments and Net Other Assets (Liabilities) 45.9 ASSET ALLOCATION (% of Fund's total exposure)     Futures Contracts - 54.1                   Short-Term Investments and Net Other Assets (Liabilities) - 45.9  
Fidelity Commodity Strategy Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Commodity Strategy Fund
Class Name Fidelity® Commodity Strategy Fund
Trading Symbol FYHTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Commodity Strategy Fund for the period August 1, 2025 to January 31, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Commodity Strategy Fund 
$ 34 
0.62%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.62%
Net Assets $ 156,715,105
Holdings Count | shares 57
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$156,715,105
  
Number of Holdings
57
  
Portfolio Turnover
0%
  
Holdings [Text Block] Industrial Metals 29.6 Energy 27.8 Agriculture 22.5 Precious Metals 15.5 Livestock 4.6 COMMODITY SECTOR DIVERSIFICATION (% of Fund's net assets)   Industrial Metals - 29.6                   Energy - 27.8                              Agriculture - 22.5                         Precious Metals - 15.5                     Livestock - 4.6                            DERIVATIVE EXPOSURE (% of Fund's net assets)     Futures Contracts 60.9   Swaps 54.9           Futures Contracts 28.2 Swaps 25.4 Short-Term Investments and Net Other Assets (Liabilities) 46.4 ASSET ALLOCATION (% of Fund's total exposure)     Futures Contracts - 28.2                   Swaps - 25.4                               Short-Term Investments and Net Other Assets (Liabilities) - 46.4