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    <unit id="usd">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <dei:DocumentType contextRef="Trust" id="ixv-15923">485BPOS</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="Trust" id="ixv-15924">2026-02-28</dei:DocumentPeriodEndDate>
    <dei:AmendmentFlag contextRef="Trust" id="ixv-15925">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey contextRef="Trust" id="ixv-15926">0000722574</dei:EntityCentralIndexKey>
    <dei:EntityInvCompanyType contextRef="Trust" id="ixv-15927">N-1A</dei:EntityInvCompanyType>
    <dei:EntityRegistrantName contextRef="Trust" id="ixv-15928">Fidelity Advisor Series I</dei:EntityRegistrantName>
    <oef:RiskReturnHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-248">


     Fund Summary

     Fund /Class:
     Fidelity Advisor&#xae; Mid Cap II Fund
     /A, M, C, I, Z &#160;

   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-263">


     Investment Objective


   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-268">


     Fidelity Advisor&#xae; Mid Cap II Fund seeks long-term growth of capital.


   </oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-273">


     Fee Table


   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-279">


     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.


      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

      &#xae;

      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 31 of the prospectus



     and in

     the sales charge

     waiver appendix to

     the prospectus.

   </oef:ExpenseNarrativeTextBlock>
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      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

      &#xae;

      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 31 of the prospectus

     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000017686_contentCd_AMP-PRO"
      decimals="0"
      id="ixv-16462"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-306">


     Shareholder fees


   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="4"
      id="ixv-16463"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="4"
      id="ixv-16464"
      unitRef="pure">0.0350</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="4"
      id="ixv-16465"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="4"
      id="ixv-16466"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="4"
      id="ixv-16467"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="4"
      id="footnoteAMP-PROS000017686SHF_AC000048874"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="4"
      id="footnoteAMP-PROS000017686SHF_AC000048877"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="4"
      id="footnoteAMP-PROS000017686SHF_BC000048876"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="4"
      id="ixv-16471"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="4"
      id="ixv-16472"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-412">

      Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% and 0.25%, respectively.

     </oef:ExpensesDeferredChargesTextBlock>
    <oef:ExpensesDeferredChargesTextBlock contextRef="Pid_S000017686_Cid_C000048876" id="ixv-422">

      On Class C shares redeemed less than one year after purchase.

     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-427">


     Annual Operating Expenses


   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="6"
      id="ixv-16473"
      unitRef="pure">0.0069</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="6"
      id="ixv-16474"
      unitRef="pure">0.0069</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="6"
      id="ixv-16475"
      unitRef="pure">0.0069</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="6"
      id="ixv-16476"
      unitRef="pure">0.0069</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="6"
      id="ixv-16477"
      unitRef="pure">0.0056</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="6"
      id="ixv-16478"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="6"
      id="ixv-16479"
      unitRef="pure">0.0050</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="6"
      id="ixv-16480"
      unitRef="pure">0.0100</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="6"
      id="ixv-16481"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="6"
      id="ixv-16482"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="6"
      id="ixv-16483"
      unitRef="pure">0.0002</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="6"
      id="ixv-16484"
      unitRef="pure">0.0002</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="6"
      id="ixv-16485"
      unitRef="pure">0.0002</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="6"
      id="ixv-16486"
      unitRef="pure">0.0001</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="6"
      id="ixv-16487"
      unitRef="pure">0.0002</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="6"
      id="ixv-16488"
      unitRef="pure">0.0096</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="6"
      id="ixv-16489"
      unitRef="pure">0.0121</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="6"
      id="ixv-16490"
      unitRef="pure">0.0171</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="6"
      id="ixv-16491"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="6"
      id="ixv-16492"
      unitRef="pure">0.0058</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-586">




     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 the 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:

   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16493"
      unitRef="usd">667</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16494"
      unitRef="usd">667</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16495"
      unitRef="usd">469</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16496"
      unitRef="usd">469</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16497"
      unitRef="usd">274</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16498"
      unitRef="usd">174</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16499"
      unitRef="usd">72</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16500"
      unitRef="usd">72</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16501"
      unitRef="usd">59</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16502"
      unitRef="usd">59</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16503"
      unitRef="usd">863</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16504"
      unitRef="usd">863</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16505"
      unitRef="usd">721</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16506"
      unitRef="usd">721</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16507"
      unitRef="usd">539</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16508"
      unitRef="usd">539</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16509"
      unitRef="usd">224</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16510"
      unitRef="usd">224</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16511"
      unitRef="usd">186</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16512"
      unitRef="usd">186</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16513"
      unitRef="usd">1075</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16514"
      unitRef="usd">1075</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16515"
      unitRef="usd">992</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16516"
      unitRef="usd">992</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16517"
      unitRef="usd">928</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16518"
      unitRef="usd">928</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16519"
      unitRef="usd">390</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16520"
      unitRef="usd">390</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16521"
      unitRef="usd">324</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16522"
      unitRef="usd">324</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16523"
      unitRef="usd">1685</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Pid_S000017686_Cid_C000048874"
      decimals="0"
      id="ixv-16524"
      unitRef="usd">1685</oef:ExpenseExampleNoRedemptionYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16525"
      unitRef="usd">1765</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Pid_S000017686_Cid_C000048877"
      decimals="0"
      id="ixv-16526"
      unitRef="usd">1765</oef:ExpenseExampleNoRedemptionYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16527"
      unitRef="usd">1821</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Pid_S000017686_Cid_C000048876"
      decimals="0"
      id="ixv-16528"
      unitRef="usd">1821</oef:ExpenseExampleNoRedemptionYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16529"
      unitRef="usd">871</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Pid_S000017686_Cid_C000048878"
      decimals="0"
      id="ixv-16530"
      unitRef="usd">871</oef:ExpenseExampleNoRedemptionYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16531"
      unitRef="usd">726</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Pid_S000017686_Cid_C000130154"
      decimals="0"
      id="ixv-16532"
      unitRef="usd">726</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-895">


     Portfolio Turnover


   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-900">


     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



       62


     % of the average value of its portfolio.


   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000017686_contentCd_AMP-PRO"
      decimals="4"
      id="ixv-16533"
      unitRef="pure">0.62</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-909">


     Principal Investment Strategies


   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-914">




        Normally investing at least 80% of assets in securities of companies with medium market capitalizations.

     The Adviser generally defines medium market capitalization companies as those whose market capitalization is similar to the market capitalization of companies in the Russell Midcap &#xae; Index or the S&amp;P MidCap 400 &#xae; Index.
     Derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.
     Normally investing primarily in common stocks.

      Potentially investing in companies with smaller or larger market capitalizations.
      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.


   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-947">



      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.

   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_ForeignExposureMember"
      id="ixv-956">



      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.

   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-965">



      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.

   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-976">



      "Growth" Investing.

     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. &#160; &#160; &#160;

   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_ValueInvestingMember"
      id="ixv-991">



      "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.

   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_MidCapInvestingMember"
      id="ixv-1000">



      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.



   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-1010">


     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

     .


   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000017686_contentCd_AMP-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-1018">


     &#160;

     You could lose money by investing in the fund.


   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1025">


     Performance


   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1030">


     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 and an additional index over various periods of time.



     The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus.



      Past performance (before and after taxes) is not an indication of future performance.


     Visit



      institutional.fidelity.com


     for more recent performance information.

   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1035">

      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 and an additional index over various periods of time.

     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1042">

      Past performance (before and after taxes) is not an indication of future performance.

     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1048">

      institutional.fidelity.com
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1053">


     Year-by-Year Returns

   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1057">




      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.




   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1060">

      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.

     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2016"
      decimals="INF"
      id="ixv-16534"
      unitRef="pure">0.1159</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2017"
      decimals="INF"
      id="ixv-16535"
      unitRef="pure">0.2025</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2018"
      decimals="INF"
      id="ixv-16536"
      unitRef="pure">-0.1510</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2019"
      decimals="INF"
      id="ixv-16537"
      unitRef="pure">0.2331</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2020"
      decimals="INF"
      id="ixv-16538"
      unitRef="pure">0.1834</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2021"
      decimals="INF"
      id="ixv-16539"
      unitRef="pure">0.2492</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2022"
      decimals="INF"
      id="ixv-16540"
      unitRef="pure">-0.1502</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2023"
      decimals="INF"
      id="ixv-16541"
      unitRef="pure">0.1470</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2024"
      decimals="INF"
      id="ixv-16542"
      unitRef="pure">0.1692</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_2025"
      decimals="INF"
      id="ixv-16543"
      unitRef="pure">0.1151</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1172">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000017686_contentCd_AMP-PRO"
      decimals="4"
      id="ixv-16544"
      unitRef="pure">0.2511</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1182">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1187">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000017686_contentCd_AMP-PRO"
      decimals="4"
      id="ixv-16545"
      unitRef="pure">-0.2988</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1198">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1203">


     Average Annual Returns


   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1208">




      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, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).




      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.




   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1211">

      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000017686_contentCd_AMP-PRO" id="ixv-1216">

      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.

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      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

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      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
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      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.

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         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_ReturnBeforeTaxes_01"
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      unitRef="pure">0.0510</oef:AvgAnnlRtrPct>
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      contextRef="Pid_S000017686_Cid_C000048874_ReturnBeforeTaxes_05"
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      unitRef="pure">0.0839</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_ReturnBeforeTaxes_10"
      decimals="4"
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      unitRef="pure">0.0954</oef:AvgAnnlRtrPct>
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         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048874_AfterTaxesOnDistributions_01"
      decimals="4"
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      unitRef="pure">0.0269</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
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      unitRef="pure">0.0627</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
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          Return After Taxes on Distributions and Sale of Fund Shares
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    <oef:AvgAnnlRtrPct
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      contextRef="Pid_S000017686_Cid_C000048874_AfterTaxesOnDistributionsAndSales_05"
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      unitRef="pure">0.0632</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
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      unitRef="pure">0.0741</oef:AvgAnnlRtrPct>
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         Return Before Taxes
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    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048877_ReturnBeforeTaxes_01"
      decimals="4"
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    <oef:AvgAnnlRtrPct
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      unitRef="pure">0.0864</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
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      unitRef="pure">0.0953</oef:AvgAnnlRtrPct>
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         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048876_ReturnBeforeTaxes_01"
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      unitRef="pure">0.0968</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048876_ReturnBeforeTaxes_05"
      decimals="4"
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      unitRef="pure">0.0882</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048876_ReturnBeforeTaxes_10"
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      unitRef="pure">0.0949</oef:AvgAnnlRtrPct>
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         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048878_ReturnBeforeTaxes_01"
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    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000048878_ReturnBeforeTaxes_05"
      decimals="4"
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    <oef:AvgAnnlRtrPct
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         Return Before Taxes
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    <oef:AvgAnnlRtrPct
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      unitRef="pure">0.1011</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Cid_C000130154_ReturnBeforeTaxes_10"
      decimals="4"
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      unitRef="pure">0.1064</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
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         S&amp;P MidCap 400&#xae; Index
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    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Indexid_SP004_contentCd_AMP-PRO_01"
      decimals="4"
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      unitRef="pure">0.0750</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Indexid_SP004_contentCd_AMP-PRO_05"
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      id="ixv-16568"
      unitRef="pure">0.0912</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Indexid_SP004_contentCd_AMP-PRO_10"
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      id="ixv-16569"
      unitRef="pure">0.1072</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000017686_Indexid_RS003_contentCd_AMP-PRO_01"
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         Russell 3000&#xae; Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Indexid_RS003_contentCd_AMP-PRO_01"
      decimals="4"
      id="ixv-16570"
      unitRef="pure">0.1715</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Indexid_RS003_contentCd_AMP-PRO_05"
      decimals="4"
      id="ixv-16571"
      unitRef="pure">0.1315</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000017686_Indexid_RS003_contentCd_AMP-PRO_10"
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      id="ixv-16572"
      unitRef="pure">0.1429</oef:AvgAnnlRtrPct>
    <link:footnoteLink
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        <link:footnote id="footnoteAMP-PROS000017686SHF_A" xlink:label="footnoteAMP-PROS000017686SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt">Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% and 0.25%, respectively.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
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        <link:footnote id="footnoteAMP-PROS000017686SHF_B" xlink:label="footnoteAMP-PROS000017686SHF_B" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">B</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt">On Class C shares redeemed less than one year after purchase.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
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