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Shareholder Report
 6 Months Ended
Jan. 31, 2025
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, 2025
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, 2024 to January 31, 2025.
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
0.01%
  
A Amount represents less than $.50
 
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.01%
Net Assets $ 566,029,913
Holdings Count | shares 44
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$566,029,913
  
Number of Holdings
44
  
Portfolio Turnover
0%
  
Holdings [Text Block] Agriculture 31.2 Energy 28.7 Precious Metals 19.3 Industrial Metals 15.3 Livestock 5.5 COMMODITY SECTOR DIVERSIFICATION (% of Fund's net assets)   Agriculture - 31.2                         Energy - 28.7                              Precious Metals - 19.3                     Industrial Metals - 15.3                   Livestock - 5.5                            DERIVATIVE EXPOSURE (% of Fund's net assets)     Futures Contracts 7.3   Swaps 89.6           Futures Contracts 3.7 Swaps 45.5 Short-Term Investments and Net Other Assets (Liabilities) 50.8 ASSET ALLOCATION (% of Fund's Total Exposure)     Futures Contracts - 3.7                    Swaps - 45.5                               Short-Term Investments and Net Other Assets (Liabilities) - 50.8  
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, 2024 to January 31, 2025.
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 
$ 20 
0.38%
  
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.38%
Net Assets $ 4,339,117,777
Holdings Count | shares 61
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,339,117,777
  
Number of Holdings
61
  
Portfolio Turnover
0%
  
Holdings [Text Block] Energy 44.6 Industrial Metals 26.8 Agriculture 15.4 Precious Metals 10.0 Livestock 3.2 COMMODITY SECTOR DIVERSIFICATION (% of Fund's net assets)   Energy - 44.6                              Industrial Metals - 26.8                   Agriculture - 15.4                         Precious Metals - 10.0                     Livestock - 3.2                            DERIVATIVE EXPOSURE (% of Fund's net assets)     Futures Contracts 122.5           Futures Contracts 55.1 Short-Term Investments and Net Other Assets (Liabilities) 44.9 ASSET ALLOCATION (% of Fund's Total Exposure)     Futures Contracts - 55.1                   Short-Term Investments and Net Other Assets (Liabilities) - 44.9  
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, 2024 to January 31, 2025.
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 
$ 35 
0.66%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.66%
Net Assets $ 49,966,727
Holdings Count | shares 28
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$49,966,727
  
Number of Holdings
28
  
Portfolio Turnover
0%
  
Holdings [Text Block] Agriculture 31.0 Energy 28.8 Precious Metals 19.0 Industrial Metals 15.7 Livestock 5.5 COMMODITY SECTOR DIVERSIFICATION (% of Fund's net assets)   Agriculture - 31.0                         Energy - 28.8                              Precious Metals - 19.0                     Industrial Metals - 15.7                   Livestock - 5.5                            DERIVATIVE EXPOSURE (% of Fund's net assets)     Futures Contracts 101.1           Futures Contracts 50.3 Short-Term Investments and Net Other Assets (Liabilities) 49.7 ASSET ALLOCATION (% of Fund's Total Exposure)     Futures Contracts - 50.3                   Short-Term Investments and Net Other Assets (Liabilities) - 49.7