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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY OXFORD STREET TRUST
Prospectus Date rr_ProspectusDate Sep. 29, 2016
07.31 Fidelity Series Commodity Strategy Fund Series PRO-02 | Fidelity® Series Commodity Strategy Fund  
Risk/Return: rr_RiskReturnAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Adjusted to reflect current fees.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption

Sell All Shares
07.31 Fidelity Series Commodity Strategy Fund Series PRO-02 | Fidelity® Series Commodity Strategy Fund | Fidelity Series Commodity Strategy Fund-Series Class  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets none
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets none [1]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [2]
Total annual operating expenses rr_ExpensesOverAssets 0.05% [3]
1 year rr_ExpenseExampleYear01 $ 5
3 years rr_ExpenseExampleYear03 16
5 years rr_ExpenseExampleYear05 28
10 years rr_ExpenseExampleYear10 $ 64
[1] Adjusted to reflect current fees.
[2] The fund may invest in a wholly-owned subsidiary. The subsidiary has entered into a separate contract with Geode Capital Management, LLC (Geode) for the management of its portfolio pursuant to which the subsidiary pays Geode a fee at an annual rate of 0.30% of its net assets. The subsidiary also pays certain other expenses including custody fees.
[3] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.