Investment Risks |
Sep. 29, 2025 |
|---|---|
| FidelityAdvisorRealEstateFund-AMCIZPRO | Fidelity Advisor Real Estate Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorRealEstateFund-AMCIZPRO | Fidelity Advisor Real Estate Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorRealEstateFund-AMCIZPRO | Fidelity Advisor Real Estate Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorRealEstateFund-AMCIZPRO | Fidelity Advisor Real Estate Fund | RealEstateIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer. |
| FidelityAdvisorRealEstateFund-AMCIZPRO | Fidelity Advisor Real Estate Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorRealEstateFund-AMCIZPRO | Fidelity Advisor Real Estate Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorRealEstateFund-AMCIZPRO | Fidelity Advisor Real Estate Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Biotechnology Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Biotechnology Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Biotechnology Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Biotechnology Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Biotechnology Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Biotechnology Fund | BiotechnologyIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Biotechnology Industry Concentration. The biotechnology industry can be significantly affected by patent considerations, intense competition, rapid technological change and obsolescence, and government regulation, and revenue patterns can be erratic. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Biotechnology Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Consumer Discretionary Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Consumer Discretionary Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Consumer Discretionary Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Consumer Discretionary Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Consumer Discretionary Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Consumer Discretionary Fund | ConsumerDiscretionaryIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Consumer Discretionary Industry Concentration. The consumer discretionary industries can be significantly affected by the performance of the overall economy, interest rates, competition, consumer confidence and spending, and changes in demographics and consumer tastes. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Consumer Discretionary Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Energy Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Energy Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Energy Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Energy Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Energy Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Energy Fund | EnergyIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Energy Industry Concentration. The energy industries can be significantly affected by fluctuations in energy prices and supply and demand of energy fuels, energy conservation, the success of exploration projects, and tax and other government regulations. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Energy Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Financials Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Financials Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Financials Fund | FinancialsIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Financials Industry Concentration. The financials industries are subject to extensive government regulation, can be subject to relatively rapid change due to increasingly blurred distinctions between service segments, and can be significantly affected by availability and cost of capital funds, changes in interest rates, the rate of corporate and consumer debt defaults, and price competition. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Financials Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Financials Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Financials Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Health Care Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Health Care Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Health Care Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Health Care Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Health Care Fund | HealthCareIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Health Care Industry Concentration. The health care industries are subject to government regulation and reimbursement rates, as well as government approval of products and services, which could have a significant effect on price and availability, and can be significantly affected by product liability claims, rapid obsolescence, and patent expirations. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Health Care Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Industrials Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Industrials Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Industrials Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Industrials Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Industrials Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Industrials Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Industrials Fund | IndustrialsIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industrials Industry Concentration. Industrial industries can be significantly affected by general economic trends, changes in consumer sentiment and spending, commodity prices, legislation, government regulation and spending, import controls, worldwide competition, and liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Semiconductors Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Semiconductors Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Semiconductors Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Semiconductors Fund | ElectronicsIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Electronics Industry Concentration. The electronics industry can be significantly affected by rapid obsolescence, intense competition, and global demand. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Semiconductors Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Semiconductors Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Semiconductors Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Technology Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Technology Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Technology Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Technology Fund | TechnologyIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Technology Industry Concentration. The technology industries can be significantly affected by obsolescence of existing technology, short product cycles, falling prices and profits, competition from new market entrants, and general economic conditions. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Technology Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Technology Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Technology Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Foreign Exposure. Foreign markets, particularly emerging 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | HighPortfolioTurnoverMember | |
| Prospectus Line Items | |
| Risk [Text Block] | High Portfolio Turnover. High portfolio turnover (more than 100%) may result in increased transaction costs and potentially higher capital gains or losses. The effects of higher than normal portfolio turnover may adversely affect the fund's performance. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityAdvisorFocusFunds-AMCIZComboPRO | Fidelity Advisor Utilities Fund | UtilitiesIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Utilities Industry Concentration. The utilities industries can be significantly affected by government regulation, interest rate changes, financing difficulties, supply and demand of services or fuel, intense competition, natural resource conservation, and commodity price fluctuations. |
| Document Type | 485BPOS |