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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2011
Registrant Name dei_EntityRegistrantName FIDELITY CONTRAFUND
Central Index Key dei_EntityCentralIndexKey 0000024238
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Feb. 28, 2012
Document Effective Date dei_DocumentEffectiveDate Feb. 29, 2012
Prospectus Date rr_ProspectusDate Feb. 29, 2012
A T B C | Fidelity Advisor New Insights Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund/Class:
Fidelity Advisor® New Insights Fund/A, T, B, C
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks capital appreciation.
Fee Table fc24238_FundFeesAndExpensesAbstract  
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, hold, or sell 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 (Click Here) of the prospectus.

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
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Example rr_ExpenseExampleAbstract  
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 mutual 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 rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Hold Shares
Portfolio Turnover fc24238_PortfolioTurnoverAltAbstract  
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 58% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 58.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing primarily in common stocks.
  • Investing in securities of companies whose value Fidelity Management & Research Company (FMR) believes is not fully recognized by the public.
  • Investing in domestic and foreign issuers.
  • Investing in either "growth" stocks or "value" stocks or both.
  • Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as 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 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.

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 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.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fc24238_FundPastPerformanceAbstract  
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 Information about the Index 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 Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.advisor.fidelity.com
Annual Total Returns rr_BarChartTableAbstract  
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 Return13.72%September 30, 2009
Lowest Quarter Return-20.76%December 31, 2008
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
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. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
For the periods ended
December 31, 2011
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 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 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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
A T B C | Fidelity Advisor New Insights Fund | Class A
  
Shareholder fees rr_ShareholderFeesAbstract  
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]
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.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.24%
Total annual operating expenses rr_ExpensesOverAssets 1.08%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 679
3 years rr_ExpenseExampleYear03 899
5 years rr_ExpenseExampleYear05 1,136
10 years rr_ExpenseExampleYear10 1,816
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 679
3 years rr_ExpenseExampleNoRedemptionYear03 899
5 years rr_ExpenseExampleNoRedemptionYear05 1,136
10 years rr_ExpenseExampleNoRedemptionYear10 1,816
Annual Total Returns rr_BarChartTableAbstract  
2004 rr_AnnualReturn2004 18.76%
2005 rr_AnnualReturn2005 19.01%
2006 rr_AnnualReturn2006 11.06%
2007 rr_AnnualReturn2007 20.26%
2008 rr_AnnualReturn2008 (37.92%)
2009 rr_AnnualReturn2009 29.12%
2010 rr_AnnualReturn2010 16.07%
2011 rr_AnnualReturn2011 (1.04%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.72%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.76%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
A T B C | Fidelity Advisor New Insights Fund | Class T
  
Shareholder fees rr_ShareholderFeesAbstract  
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]
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.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.23%
Total annual operating expenses rr_ExpensesOverAssets 1.32%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 480
3 years rr_ExpenseExampleYear03 754
5 years rr_ExpenseExampleYear05 1,048
10 years rr_ExpenseExampleYear10 1,885
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 480
3 years rr_ExpenseExampleNoRedemptionYear03 754
5 years rr_ExpenseExampleNoRedemptionYear05 1,048
10 years rr_ExpenseExampleNoRedemptionYear10 1,885
A T B C | Fidelity Advisor New Insights Fund | Class B
  
Shareholder fees rr_ShareholderFeesAbstract  
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]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Declines over 6 years from 5.00% to 0%.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.30%
Total annual operating expenses rr_ExpensesOverAssets 1.89%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 692
3 years rr_ExpenseExampleYear03 894
5 years rr_ExpenseExampleYear05 1,221
10 years rr_ExpenseExampleYear10 1,901
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 192
3 years rr_ExpenseExampleNoRedemptionYear03 594
5 years rr_ExpenseExampleNoRedemptionYear05 1,021
10 years rr_ExpenseExampleNoRedemptionYear10 1,901
A T B C | Fidelity Advisor New Insights Fund | Class C
  
Shareholder fees rr_ShareholderFeesAbstract  
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]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.24%
Total annual operating expenses rr_ExpensesOverAssets 1.83%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 286
3 years rr_ExpenseExampleYear03 576
5 years rr_ExpenseExampleYear05 990
10 years rr_ExpenseExampleYear10 2,148
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 186
3 years rr_ExpenseExampleNoRedemptionYear03 576
5 years rr_ExpenseExampleNoRedemptionYear05 990
10 years rr_ExpenseExampleNoRedemptionYear10 2,148
A T B C | Fidelity Advisor New Insights Fund | Return Before Taxes | Class A
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (6.73%)
Past 5 years rr_AverageAnnualReturnYear05 0.85%
Life of fund rr_AverageAnnualReturnSinceInception 8.17% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
A T B C | Fidelity Advisor New Insights Fund | Return Before Taxes | Class T
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class T - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (4.71%)
Past 5 years rr_AverageAnnualReturnYear05 1.08%
Life of fund rr_AverageAnnualReturnSinceInception 8.23% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
A T B C | Fidelity Advisor New Insights Fund | Return Before Taxes | Class B
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class B - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (6.75%)
Past 5 years rr_AverageAnnualReturnYear05 0.84%
Life of fund rr_AverageAnnualReturnSinceInception 8.20% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
A T B C | Fidelity Advisor New Insights Fund | Return Before Taxes | Class C
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class C - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (2.72%)
Past 5 years rr_AverageAnnualReturnYear05 1.30%
Life of fund rr_AverageAnnualReturnSinceInception 8.12% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
A T B C | Fidelity Advisor New Insights Fund | Return After Taxes on Distributions | Class A
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 (6.78%)
Past 5 years rr_AverageAnnualReturnYear05 0.76%
Life of fund rr_AverageAnnualReturnSinceInception 8.08% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
A T B C | Fidelity Advisor New Insights Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 (4.37%)
Past 5 years rr_AverageAnnualReturnYear05 0.73%
Life of fund rr_AverageAnnualReturnSinceInception 7.19% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
A T B C | Fidelity Advisor New Insights Fund | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 2.11%
Past 5 years rr_AverageAnnualReturnYear05 (0.25%)
Life of fund rr_AverageAnnualReturnSinceInception 4.98% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
Inst | Fidelity Advisor New Insights Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund/Class:
Fidelity Advisor® New Insights Fund/Institutional
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks capital appreciation.
Fee Table fc24238_FundFeesAndExpensesAbstract  
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, hold, or sell shares of the fund.
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Example rr_ExpenseExampleAbstract  
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 mutual 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:

Portfolio Turnover fc24238_PortfolioTurnoverAltAbstract  
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 58% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 58.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing primarily in common stocks.
  • Investing in securities of companies whose value Fidelity Management & Research Company (FMR) believes is not fully recognized by the public.
  • Investing in domestic and foreign issuers.
  • Investing in either "growth" stocks or "value" stocks or both.
  • Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as 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 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.

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 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.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fc24238_FundPastPerformanceAbstract  
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 Information about the Index 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 Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.advisor.fidelity.com
Annual Total Returns rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return13.73%September 30, 2009
Lowest Quarter Return-20.70%December 31, 2008
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock 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. 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. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
For the periods ended
December 31, 2011
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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Inst | Fidelity Advisor New Insights Fund | Institutional Class
  
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual operating expenses rr_ExpensesOverAssets 0.81%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 83
3 years rr_ExpenseExampleYear03 259
5 years rr_ExpenseExampleYear05 450
10 years rr_ExpenseExampleYear10 1,002
Annual Total Returns rr_BarChartTableAbstract  
2004 rr_AnnualReturn2004 19.27%
2005 rr_AnnualReturn2005 19.43%
2006 rr_AnnualReturn2006 11.40%
2007 rr_AnnualReturn2007 20.57%
2008 rr_AnnualReturn2008 (37.76%)
2009 rr_AnnualReturn2009 29.37%
2010 rr_AnnualReturn2010 16.34%
2011 rr_AnnualReturn2011 (0.73%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.73%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.70%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Inst | Fidelity Advisor New Insights Fund | Return Before Taxes | Institutional Class
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (0.73%)
Past 5 years rr_AverageAnnualReturnYear05 2.31%
Life of fund rr_AverageAnnualReturnSinceInception 9.24% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
Inst | Fidelity Advisor New Insights Fund | Return After Taxes on Distributions | Institutional Class
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 (0.79%)
Past 5 years rr_AverageAnnualReturnYear05 2.19%
Life of fund rr_AverageAnnualReturnSinceInception 9.13% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
Inst | Fidelity Advisor New Insights Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 (0.47%)
Past 5 years rr_AverageAnnualReturnYear05 1.97%
Life of fund rr_AverageAnnualReturnSinceInception 8.17% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
Inst | Fidelity Advisor New Insights Fund | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 2.11%
Past 5 years rr_AverageAnnualReturnYear05 (0.25%)
Life of fund rr_AverageAnnualReturnSinceInception 4.98% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 31, 2003
Retail | Fidelity Contrafund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund/Class:
Fidelity® Contrafund®/Fidelity Contrafund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks capital appreciation.
Fee Table fc24238_FundFeesAndExpensesAbstract  
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.
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Example rr_ExpenseExampleAbstract  
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 mutual 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:

Portfolio Turnover fc24238_PortfolioTurnoverAltAbstract  
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 55% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 55.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing primarily in common stocks.
  • Investing in securities of companies whose value Fidelity Management & Research Company (FMR) believes is not fully recognized by the public.
  • Investing in domestic and foreign issuers.
  • Investing in either "growth" stocks or "value" stocks or both.
  • Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as 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 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.

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 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.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fc24238_FundPastPerformanceAbstract  
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 Information about the Index section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.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 Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fidelity.com
Annual Total Returns rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return13.91%September 30, 2009
Lowest Quarter Return-20.43%December 31, 2008
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock 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. 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. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
For the periods ended
December 31, 2011
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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Retail | Fidelity Contrafund | Class: Fidelity Contrafund
  
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.63%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.18%
Total annual operating expenses rr_ExpensesOverAssets 0.81%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 83
3 years rr_ExpenseExampleYear03 259
5 years rr_ExpenseExampleYear05 450
10 years rr_ExpenseExampleYear10 1,002
Annual Total Returns rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 (9.63%)
2003 rr_AnnualReturn2003 27.95%
2004 rr_AnnualReturn2004 15.07%
2005 rr_AnnualReturn2005 16.23%
2006 rr_AnnualReturn2006 11.54%
2007 rr_AnnualReturn2007 19.78%
2008 rr_AnnualReturn2008 (37.16%)
2009 rr_AnnualReturn2009 29.23%
2010 rr_AnnualReturn2010 16.93%
2011 rr_AnnualReturn2011 (0.14%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.91%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.43%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Retail | Fidelity Contrafund | Return Before Taxes | Class: Fidelity Contrafund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Contrafund
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (0.14%)
Past 5 years rr_AverageAnnualReturnYear05 2.58%
Past 10 years rr_AverageAnnualReturnYear10 6.96%
Retail | Fidelity Contrafund | Return After Taxes on Distributions | Class: Fidelity Contrafund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Contrafund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 (0.19%)
Past 5 years rr_AverageAnnualReturnYear05 2.29%
Past 10 years rr_AverageAnnualReturnYear10 6.61%
Retail | Fidelity Contrafund | Return After Taxes on Distributions and Sale of Fund Shares | Class: Fidelity Contrafund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Contrafund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 (0.03%)
Past 5 years rr_AverageAnnualReturnYear05 2.20%
Past 10 years rr_AverageAnnualReturnYear10 6.11%
Retail | Fidelity Contrafund | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 2.11%
Past 5 years rr_AverageAnnualReturnYear05 (0.25%)
Past 10 years rr_AverageAnnualReturnYear10 2.92%
K | Fidelity Contrafund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund/Class:
Fidelity® Contrafund®/K
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks capital appreciation.
Fee Table fc24238_FundFeesAndExpensesAbstract  
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.
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Example rr_ExpenseExampleAbstract  
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 mutual 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:

Portfolio Turnover fc24238_PortfolioTurnoverAltAbstract  
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 55% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 55.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing primarily in common stocks.
  • Investing in securities of companies whose value Fidelity Management & Research Company (FMR) believes is not fully recognized by the public.
  • Investing in domestic and foreign issuers.
  • Investing in either "growth" stocks or "value" stocks or both.
  • Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as 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 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.

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 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.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fc24238_FundPastPerformanceAbstract  
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 Information about the Index section of the prospectus. Past performance is not an indication of future performance.

Visit www.401k.com and log in 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 Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.401k.com and log in for updated return information
Annual Total Returns rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return13.92%September 30, 2009
Lowest Quarter Return-11.61%September 30, 2011
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
For the periods ended
December 31, 2011
K | Fidelity Contrafund | Class K
  
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee (fluctuates based on the fund's performance relative to a securities market index) rr_ManagementFeesOverAssets 0.63%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.06%
Total annual operating expenses rr_ExpensesOverAssets 0.69%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 70
3 years rr_ExpenseExampleYear03 221
5 years rr_ExpenseExampleYear05 384
10 years rr_ExpenseExampleYear10 859
Annual Total Returns rr_BarChartTableAbstract  
2009 rr_AnnualReturn2009 29.43%
2010 rr_AnnualReturn2010 17.09%
2011 rr_AnnualReturn2011 (0.02%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.92%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.61%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class K
Past 1 year rr_AverageAnnualReturnYear01 (0.02%)
Life of fund rr_AverageAnnualReturnSinceInception 0.15% [5]
Inception Date rr_AverageAnnualReturnInceptionDate May 09, 2008
K | Fidelity Contrafund | S&P 500® Index (reflects no deduction for fees, expenses, or taxes)
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 2.11%
Life of fund rr_AverageAnnualReturnSinceInception (0.47%) [5]
Inception Date rr_AverageAnnualReturnInceptionDate May 09, 2008
[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 July 31, 2003.
[5] From May 9, 2008.