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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY DEVONSHIRE TRUST
Prospectus Date rr_ProspectusDate Apr. 01, 2017
01.31 Fidelity Series Equity-Income Fund Series PRO-04 | Fidelity® Series Equity-Income 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
01.31 Fidelity Series Equity-Income Fund Series PRO-04 | Fidelity® Series Equity-Income Fund | Fidelity Series Equity-Income 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%
Total annual operating expenses rr_ExpensesOverAssets 0.05% [2]
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] 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.