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Risk/Return Detail Data - FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO
Jan. 29, 2025
USD ($)
Risk/Return:  
Registrant Name Fidelity Advisor Series I
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund  
Risk/Return:  
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Advisor® Stock Selector Mid Cap Fund /A, M, C, I, Z  
Objective [Heading] Investment Objective
Objective, Primary [Text Block] Fidelity Advisor® Stock Selector Mid Cap Fund seeks long-term growth of capital.
Expense [Heading] Fee Table
Expense Narrative [Text Block] 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 ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 33 of the prospectus and in the sales charge waiver appendix to the prospectus.
Shareholder Fees Caption [Text] Shareholder fees
Operating Expenses Caption [Text] Annual Operating Expenses
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] 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 52 % of the average value of its portfolio.
Portfolio Turnover, Rate 52.00%
Expenses Deferred Charges [Text Block] 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.
Expense Breakpoint Discounts [Text] 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 33 of the prospectus
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000
Expenses Restated to Reflect Current [Text] Adjusted to reflect current fees.
Expense Example Narrative [Text Block] 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:
Strategy [Heading] Principal Investment Strategies
Strategy Narrative [Text Block] Normally investing at least 80% of assets in stocks 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). Effective December 11, 2025, 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. Potentially investing in companies with smaller or larger market capitalizations. Investing in domestic and foreign issuers. Allocating the fund's assets across different market sectors (at present, communication services, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, real estate, and utilities), using different Fidelity managers. 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] Principal Investment Risks
Bar Chart and Performance Table [Heading] Performance
Performance Narrative [Text Block] 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.
Performance Information Illustrates Variability of Returns [Text] 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.
Performance Availability Website Address [Text] institutional.fidelity.com
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading] Year-by-Year Returns
Bar Chart Narrative [Text Block] 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.
Bar Chart Does Not Reflect Sales Loads [Text] 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.
Highest Quarterly Return, Label    Highest Quarter Return
Highest Quarterly Return, Date Jun. 30, 2020
Highest Quarterly Return 25.44%
Lowest Quarterly Return, Label    Lowest Quarter Return
Lowest Quarterly Return, Date Mar. 31, 2020
Lowest Quarterly Return (31.71%)
Performance Table Heading Average Annual Returns
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.
Performance Table Uses Highest Federal Rate 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 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).
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher 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.
Performance Table Narrative 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.
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Fidelity Advisor Stock Selector Mid Cap Fund - Class A  
Risk/Return:  
Maximum sales charge (load) on purchases (as a % of offering price) 5.75%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) none [1]
Management fee 0.64% [2],[3]
Distribution and/or Service (12b-1) fees 0.25%
Other expenses 0.02% [3]
Acquired fund fees and expenses 0.02%
Total annual operating expenses 0.93%
1 year $ 664
3 years 854
5 years 1,060
10 years 1,652
1 Year 664
3 Years 854
5 Years 1,060
10 Years $ 1,652
2015 (3.54%)
2016 10.40%
2017 19.90%
2018 (8.72%)
2019 29.28%
2020 12.80%
2021 22.92%
2022 (14.10%)
2023 16.85%
2024 12.18%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Fidelity Advisor Stock Selector Mid Cap Fund - Class C  
Risk/Return:  
Maximum sales charge (load) on purchases (as a % of offering price) none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) 1.00% [4]
Management fee 0.64% [2],[3]
Distribution and/or Service (12b-1) fees 1.00%
Other expenses 0.02% [3]
Acquired fund fees and expenses 0.02%
Total annual operating expenses 1.68%
Expenses Deferred Charges [Text Block] On Class C shares redeemed less than one year after purchase.
1 year $ 271
3 years 530
5 years 913
10 years 1,788
1 Year 171
3 Years 530
5 Years 913
10 Years $ 1,788
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Fidelity Advisor Stock Selector Mid Cap Fund - Class M  
Risk/Return:  
Maximum sales charge (load) on purchases (as a % of offering price) 3.50%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) none [1]
Management fee 0.64% [2],[3]
Distribution and/or Service (12b-1) fees 0.50%
Other expenses 0.01% [3]
Acquired fund fees and expenses 0.02%
Total annual operating expenses 1.17%
1 year $ 465
3 years 709
5 years 971
10 years 1,721
1 Year 465
3 Years 709
5 Years 971
10 Years $ 1,721
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Fidelity Advisor Stock Selector Mid Cap Fund - Class I  
Risk/Return:  
Maximum sales charge (load) on purchases (as a % of offering price) none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) none
Management fee 0.64% [2],[3]
Distribution and/or Service (12b-1) fees none
Other expenses 0.02% [3]
Acquired fund fees and expenses 0.02%
Total annual operating expenses 0.68%
1 year $ 69
3 years 218
5 years 379
10 years 847
1 Year 69
3 Years 218
5 Years 379
10 Years $ 847
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Fidelity Advisor Stock Selector Mid Cap Fund - Class Z  
Risk/Return:  
Maximum sales charge (load) on purchases (as a % of offering price) none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) none
Management fee 0.52% [2],[3]
Distribution and/or Service (12b-1) fees none
Other expenses 0.01% [3]
Acquired fund fees and expenses 0.02%
Total annual operating expenses 0.55%
1 year $ 56
3 years 176
5 years 307
10 years 689
1 Year 56
3 Years 176
5 Years 307
10 Years $ 689
Annual Return, Inception Date Feb. 01, 2017
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Return Before Taxes | Fidelity Advisor Stock Selector Mid Cap Fund - Class A  
Risk/Return:  
Label Return Before Taxes
Past 1 year 5.73%
Past 5 years 8.03%
Past 10 years 8.29%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Return Before Taxes | Fidelity Advisor Stock Selector Mid Cap Fund - Class C  
Risk/Return:  
Label Return Before Taxes
Past 1 year 10.32%
Past 5 years 8.46%
Past 10 years 8.26%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Return Before Taxes | Fidelity Advisor Stock Selector Mid Cap Fund - Class M  
Risk/Return:  
Label Return Before Taxes
Past 1 year 7.98%
Past 5 years 8.28%
Past 10 years 8.28%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Return Before Taxes | Fidelity Advisor Stock Selector Mid Cap Fund - Class I  
Risk/Return:  
Label Return Before Taxes
Past 1 year 12.45%
Past 5 years 9.58%
Past 10 years 9.18%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | Return Before Taxes | Fidelity Advisor Stock Selector Mid Cap Fund - Class Z  
Risk/Return:  
Label Return Before Taxes
Past 1 year 12.57%
Past 5 years 9.73%
Since Inception 10.59% [5]
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | After Taxes on Distributions | Fidelity Advisor Stock Selector Mid Cap Fund - Class A  
Risk/Return:  
Label Return After Taxes on Distributions
Past 1 year 4.91%
Past 5 years 6.51%
Past 10 years 6.73%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | After Taxes on Distributions and Sales | Fidelity Advisor Stock Selector Mid Cap Fund - Class A  
Risk/Return:  
Label Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year 3.86%
Past 5 years 6.02%
Past 10 years 6.27%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | SP001  
Risk/Return:  
Label S&P 500® Index
Past 1 year 25.02%
Past 5 years 14.53%
Past 10 years 13.10%
FidelityAdvisorStockSelectorMidCapFund-AMCIZPRO | Fidelity Advisor Stock Selector Mid Cap Fund | SP004  
Risk/Return:  
Label S&P MidCap 400® Index
Past 1 year 13.93%
Past 5 years 10.34%
Past 10 years 9.68%
[1]
A 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.
[2]
A The management fee comprises a basic fee , which may vary by class, that is adjusted up or down (subject to a maximum rate) based on the performance of the fund or a designated class of the fund relative to that of the S&P MidCap 400® Index. The basic fee covers administrative services previously provided under separate services agreements with the fund, for which 0.20%, 0.19%, 0.23%, 0.21%, and 0.07% for Class A, Class M, Class C, Class I, and Class Z, respectively, was previously charged under the services agreements. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.
[3]
B Adjusted to reflect current fees.
[4]
B On Class C shares redeemed less than one year after purchase.
[5]
A From February 1, 2017 .