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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY DEVONSHIRE TRUST
Prospectus Date rr_ProspectusDate Apr. 01, 2014
A T B C | Fidelity Mid Cap Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary

Fund/Class:
Fidelity® Mid Cap Value Fund/Fidelity Advisor® Mid Cap Value Fund A, T, B, C
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 30 of the prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees
(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual operating expenses
(expenses that you pay each year as a % of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 169% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 169.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sell All Shares
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Hold Shares
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing primarily in common stocks.
  • Normally investing at least 80% of assets in securities of companies with medium market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell Midcap® Index or the S&P MidCap 400® Index).
  • Potentially investing in companies with smaller or larger market capitalizations.
  • Investing in securities of companies that Fidelity Management & Research Company (FMR) believes are undervalued in the marketplace in relation to factors such as assets, sales, earnings, growth potential, or cash flow, or in relation to securities of other companies in the same industry (stocks of these companies are often called "value" stocks).
  • Using the Russell Midcap® Value Index as a guide in structuring the fund and selecting its investments.
  • Investing in domestic and foreign issuers.
  • Using quantitative analysis to evaluate growth potential, valuation, liquidity, and investment risk, along with fundamental analysis of factors such as each issuer's financial condition, its industry position, and market and economic conditions to select investments.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.
  • Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.
  • "Value" Investing. "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time.
  • Quantitative Investing. Securities selected using quantitative analysis can perform differently from the market as a whole as a result of the factors used in the analysis, the weight placed on each factor, and changes in the factors' historical trends.
  • Mid Cap Investing. The value of securities of medium size, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.advisor.fidelity.com for updated return information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.advisor.fidelity.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Returns
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart for Class A:
Returns
Quarter ended
Highest Quarter Return
25.44%
September 30, 2009
Lowest Quarter Return
-24.87%
December 31, 2008
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement.

For the periods ended
December 31, 2013
A T B C | Fidelity Mid Cap Value Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.75%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.75%
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.56%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.34%
Total annual operating expenses rr_ExpensesOverAssets 1.15%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 685
3 years rr_ExpenseExampleYear03 919
5 years rr_ExpenseExampleYear05 1,172
10 years rr_ExpenseExampleYear10 1,892
1 year rr_ExpenseExampleNoRedemptionYear01 685
3 years rr_ExpenseExampleNoRedemptionYear03 919
5 years rr_ExpenseExampleNoRedemptionYear05 1,172
10 years rr_ExpenseExampleNoRedemptionYear10 1,892
2008 rr_AnnualReturn2008 (40.74%)
2009 rr_AnnualReturn2009 35.14%
2010 rr_AnnualReturn2010 25.06%
2011 rr_AnnualReturn2011 (4.54%)
2012 rr_AnnualReturn2012 18.77%
2013 rr_AnnualReturn2013 38.50%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.44%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.87%)
A T B C | Fidelity Mid Cap Value Fund | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 3.50%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.75%
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.56%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.36%
Total annual operating expenses rr_ExpensesOverAssets 1.42%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 489
3 years rr_ExpenseExampleYear03 784
5 years rr_ExpenseExampleYear05 1,099
10 years rr_ExpenseExampleYear10 1,992
1 year rr_ExpenseExampleNoRedemptionYear01 489
3 years rr_ExpenseExampleNoRedemptionYear03 784
5 years rr_ExpenseExampleNoRedemptionYear05 1,099
10 years rr_ExpenseExampleNoRedemptionYear10 1,992
A T B C | Fidelity Mid Cap Value Fund | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 5.00% [2]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.75%
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.56%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.35%
Total annual operating expenses rr_ExpensesOverAssets 1.91%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Declines over 6 years from 5.00% to 0%.
1 year rr_ExpenseExampleYear01 694
3 years rr_ExpenseExampleYear03 900
5 years rr_ExpenseExampleYear05 1,232
10 years rr_ExpenseExampleYear10 1,942
1 year rr_ExpenseExampleNoRedemptionYear01 194
3 years rr_ExpenseExampleNoRedemptionYear03 600
5 years rr_ExpenseExampleNoRedemptionYear05 1,032
10 years rr_ExpenseExampleNoRedemptionYear10 1,942
A T B C | Fidelity Mid Cap Value Fund | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.75%
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.56%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.33%
Total annual operating expenses rr_ExpensesOverAssets 1.89%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
1 year rr_ExpenseExampleYear01 292
3 years rr_ExpenseExampleYear03 594
5 years rr_ExpenseExampleYear05 1,021
10 years rr_ExpenseExampleYear10 2,212
1 year rr_ExpenseExampleNoRedemptionYear01 192
3 years rr_ExpenseExampleNoRedemptionYear03 594
5 years rr_ExpenseExampleNoRedemptionYear05 1,021
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,212
A T B C | Fidelity Mid Cap Value Fund | Return Before Taxes | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 30.54%
Past 5 years rr_AverageAnnualReturnYear05 20.12%
Life of class rr_AverageAnnualReturnSinceInception 5.39% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2007
A T B C | Fidelity Mid Cap Value Fund | Return Before Taxes | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class T - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 33.34%
Past 5 years rr_AverageAnnualReturnYear05 20.36%
Life of class rr_AverageAnnualReturnSinceInception 5.48% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2007
A T B C | Fidelity Mid Cap Value Fund | Return Before Taxes | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class B - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 32.40%
Past 5 years rr_AverageAnnualReturnYear05 20.46%
Life of class rr_AverageAnnualReturnSinceInception 5.51% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2007
A T B C | Fidelity Mid Cap Value Fund | Return Before Taxes | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class C - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 36.43%
Past 5 years rr_AverageAnnualReturnYear05 20.63%
Life of class rr_AverageAnnualReturnSinceInception 5.50% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2007
A T B C | Fidelity Mid Cap Value Fund | Return After Taxes on Distributions | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 26.57%
Past 5 years rr_AverageAnnualReturnYear05 19.29%
Life of class rr_AverageAnnualReturnSinceInception 4.68% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2007
A T B C | Fidelity Mid Cap Value Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 17.99%
Past 5 years rr_AverageAnnualReturnYear05 16.18%
Life of class rr_AverageAnnualReturnSinceInception 4.05% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2007
A T B C | Fidelity Mid Cap Value Fund | Russell Midcap Value Index (reflects no deduction for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell Midcap Value Index
Past 1 year rr_AverageAnnualReturnYear01 33.46%
Past 5 years rr_AverageAnnualReturnYear05 21.16%
Life of class rr_AverageAnnualReturnSinceInception 6.12% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 2007
[1] Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
[2] Declines over 6 years from 5.00% to 0%.
[3] On Class C shares redeemed less than one year after purchase.
[4] From February 13, 2007.