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Risk/Return Detail Data - FidelityAdvisorValueStrategiesFund-KPRO
Jan. 29, 2025
USD ($)
Risk/Return:  
Registrant Name Fidelity Advisor Series I
FidelityAdvisorValueStrategiesFund-KPRO | Fidelity Advisor Value Strategies Fund  
Risk/Return:  
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Advisor® Value Strategies Fund /Fidelity® Value Strategies Fund K
Objective [Heading] Investment Objective
Objective, Primary [Text Block] Fidelity Advisor® Value Strategies Fund seeks capital appreciation.
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.
Shareholder Fees Caption [Text] Shareholder fees
(fees paid directly from your investment) none
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 61 % of the average value of its portfolio.
Portfolio Turnover, Rate 61.00%
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:
Strategy [Heading] Principal Investment Strategies
Strategy Narrative [Text Block] Normally investing primarily in common stocks. Investing in securities of companies that Fidelity Management & Research Company LLC (FMR) believes are undervalued in the marketplace in relation to factors such as assets, sales, earnings, or growth potential (stocks of these companies are often called "value" stocks). Focusing investments in medium-sized companies, but also may invest substantially in larger or smaller companies. Investing in domestic and foreign issuers. 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. Effective December 11, 2025, normally investing at least 80% of assets in securities of value companies.  Value companies are companies the Adviser believes are undervalued in the marketplace. The Adviser considers traditional and other measures of value, such as whether the company is included in a third-party value benchmark or classified as a value company by a third-party vendor, whether the company's free cash flow yield is above the equity market median, whether the company's enterprise value (the total value of a company's outstanding equity and debt) relative to earnings is below the equity market median, or whether the company's price-to-book (P/B) ratio or projected price-to-earnings (P/E) ratio is below the equity market median. An issuer may be determined to be a value company under any of these factors. 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.
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 is not an indication of future performance. Visit www.401k.com and log in 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] www.401k.com
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.
Bar Chart [Heading] Year-by-Year Returns
Highest Quarterly Return, Label    Highest Quarter Return
Highest Quarterly Return, Date Dec. 31, 2020
Highest Quarterly Return 28.48%
Lowest Quarterly Return, Label    Lowest Quarter Return
Lowest Quarterly Return, Date Mar. 31, 2020
Lowest Quarterly Return (34.91%)
Performance Table Heading Average Annual Returns
FidelityAdvisorValueStrategiesFund-KPRO | Fidelity Advisor Value Strategies Fund | Fidelity Value Strategies Fund - Class K  
Risk/Return:  
Management fee 0.71% [1],[2]
Distribution and/or Service (12b-1) fees none
Other expenses 0.01% [2]
Total annual operating expenses 0.72%
1 year $ 74
3 years 230
5 years 401
10 years $ 894
2015 (2.43%)
2016 11.41%
2017 19.31%
2018 (17.32%)
2019 34.73%
2020 8.41%
2021 33.47%
2022 (7.26%)
2023 20.65%
2024 9.31%
FidelityAdvisorValueStrategiesFund-KPRO | Fidelity Advisor Value Strategies Fund | Return Before Taxes | Fidelity Value Strategies Fund - Class K  
Risk/Return:  
Label Class K
Past 1 year 9.31%
Past 5 years 12.09%
Past 10 years 9.84%
FidelityAdvisorValueStrategiesFund-KPRO | Fidelity Advisor Value Strategies Fund | RS013  
Risk/Return:  
Label Russell Midcap® Value Index
Past 1 year 13.07%
Past 5 years 8.59%
Past 10 years 8.10%
FidelityAdvisorValueStrategiesFund-KPRO | Fidelity Advisor Value Strategies Fund | RS003  
Risk/Return:  
Label Russell 3000® Index
Past 1 year 23.81%
Past 5 years 13.86%
Past 10 years 12.55%
[1]
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 Russell Midcap® Value Index. The basic fee covers administrative services previously provided under separate services agreements with the fund, for which 0.07% was previously charged under the services agreements. Please see "Fund Services - Fund Management - Advisory Fee(s)" for additional information.
[2]
B Adjusted to reflect current fees.