| Form N-CSR Cover | 6 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Select Portfolios |
| Entity Central Index Key | 0000320351 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 6 Months Ended |
| Aug. 31, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Select Portfolios |
| Entity Central Index Key | 0000320351 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Fidelity Natural Resources Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Natural Resources Fund |
| Class Name | Fidelity® Natural Resources Fund |
| Trading Symbol | FNARX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Natural Resources Fund for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Natural Resources Fund $ 0.70 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 648,226,804 |
| Holdings Count | shares | 38 |
| Investment Company Portfolio Turnover | 56% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 38 Portfolio Turnover 56 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 70.1 Metals & Mining 18.0 Containers & Packaging 6.3 Energy Equipment & Services 4.9 Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) United States 58.8 Canada 29.5 Portugal 4.8 Zambia 2.5 United Kingdom 1.8 Brazil 1.6 Ghana 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Exxon Mobil Corp 22.5 Imperial Oil Ltd 8.9 Shell PLC ADR 8.3 MEG Energy Corp 5.6 Valero Energy Corp 4.9 Galp Energia SGPS SA 4.8 Phillips 66 3.4 Athabasca Oil Corp 3.1 Agnico Eagle Mines Ltd (United States) 2.8 Freeport-McMoRan Inc 2.7 67.0 |
| Select Utilities Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Utilities Portfolio |
| Class Name | Utilities Portfolio |
| Trading Symbol | FSUTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Utilities Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Utilities Portfolio $ 0.67 % |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.67% |
| Net Assets | $ 1,538,756,649 |
| Holdings Count | shares | 31 |
| Investment Company Portfolio Turnover | 55% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 31 Portfolio Turnover 55 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 62.2 Multi-Utilities 25.2 Independent Power and Renewable Electricity Producers 9.5 Gas Utilities 2.1 Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NextEra Energy Inc 13.0 Sempra 7.1 PG&E Corp 6.3 Edison International 6.0 American Electric Power Co Inc 5.4 Public Service Enterprise Group Inc 5.3 Entergy Corp 4.8 Constellation Energy Corp 4.8 Eversource Energy 4.5 FirstEnergy Corp 4.2 61.4 |
| Fidelity Advisor Consumer Staples Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Consumer Staples Portfolio |
| Class Name | Fidelity Advisor® Consumer Staples Fund Class Z |
| Trading Symbol | FIJCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.58 % |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 1,405,206,341 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6 Household Products 18.8 Food Products 14.3 Consumer Staples Distribution & Retail 10.8 Personal Care Products 9.7 Tobacco 6.4 Oil, Gas & Consumable Fuels 0.1 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Coca-Cola Co/The 14.2 Procter & Gamble Co/The 14.2 Keurig Dr Pepper Inc 9.8 Kenvue Inc 6.3 Walmart Inc 5.5 Philip Morris International Inc 4.2 Monster Beverage Corp 3.9 Energizer Holdings Inc 3.8 PepsiCo Inc 3.6 Estee Lauder Cos Inc/The Class A 3.4 68.9 |
| Fidelity Advisor Consumer Staples Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Consumer Staples Portfolio |
| Class Name | Fidelity Advisor® Consumer Staples Fund Class M |
| Trading Symbol | FDTGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 1.22 % |
| Expenses Paid, Amount | $ 64 |
| Expense Ratio, Percent | 1.22% |
| Net Assets | $ 1,405,206,341 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6 Household Products 18.8 Food Products 14.3 Consumer Staples Distribution & Retail 10.8 Personal Care Products 9.7 Tobacco 6.4 Oil, Gas & Consumable Fuels 0.1 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Coca-Cola Co/The 14.2 Procter & Gamble Co/The 14.2 Keurig Dr Pepper Inc 9.8 Kenvue Inc 6.3 Walmart Inc 5.5 Philip Morris International Inc 4.2 Monster Beverage Corp 3.9 Energizer Holdings Inc 3.8 PepsiCo Inc 3.6 Estee Lauder Cos Inc/The Class A 3.4 68.9 |
| Fidelity Advisor Gold Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Gold Portfolio |
| Class Name | Fidelity Advisor® Gold Fund Class Z |
| Trading Symbol | FIJDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.60 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.60% |
| Net Assets | $ 1,501,574,716 |
| Holdings Count | shares | 65 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 65 Portfolio Turnover 13 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4 Financial Services 0.0 *Includes gold bullion and/or silver bullion. Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Agnico Eagle Mines Ltd 14.8 Newmont Corp 11.6 Wheaton Precious Metals Corp 10.3 Franco-Nevada Corp 9.3 Barrick Gold Corp 4.9 Alamos Gold Inc Class A 4.1 Northern Star Resources Ltd 3.8 Osisko Gold Royalties Ltd 2.7 Anglogold Ashanti Plc 2.3 Lundin Gold Inc 2.3 66.1 |
| Fidelity Advisor Gold Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Gold Portfolio |
| Class Name | Fidelity Advisor® Gold Fund Class I |
| Trading Symbol | FGDIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.72 % |
| Expenses Paid, Amount | $ 45 |
| Expense Ratio, Percent | 0.72% |
| Net Assets | $ 1,501,574,716 |
| Holdings Count | shares | 65 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 65 Portfolio Turnover 13 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4 Financial Services 0.0 *Includes gold bullion and/or silver bullion. Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Agnico Eagle Mines Ltd 14.8 Newmont Corp 11.6 Wheaton Precious Metals Corp 10.3 Franco-Nevada Corp 9.3 Barrick Gold Corp 4.9 Alamos Gold Inc Class A 4.1 Northern Star Resources Ltd 3.8 Osisko Gold Royalties Ltd 2.7 Anglogold Ashanti Plc 2.3 Lundin Gold Inc 2.3 66.1 |
| Fidelity Advisor Consumer Staples Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Consumer Staples Portfolio |
| Class Name | Fidelity Advisor® Consumer Staples Fund Class C |
| Trading Symbol | FDCGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.72 % |
| Expenses Paid, Amount | $ 91 |
| Expense Ratio, Percent | 1.72% |
| Net Assets | $ 1,405,206,341 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6 Household Products 18.8 Food Products 14.3 Consumer Staples Distribution & Retail 10.8 Personal Care Products 9.7 Tobacco 6.4 Oil, Gas & Consumable Fuels 0.1 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Coca-Cola Co/The 14.2 Procter & Gamble Co/The 14.2 Keurig Dr Pepper Inc 9.8 Kenvue Inc 6.3 Walmart Inc 5.5 Philip Morris International Inc 4.2 Monster Beverage Corp 3.9 Energizer Holdings Inc 3.8 PepsiCo Inc 3.6 Estee Lauder Cos Inc/The Class A 3.4 68.9 |
| Select Software and IT Services Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Software and IT Services Portfolio |
| Class Name | Software and IT Services Portfolio |
| Trading Symbol | FSCSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Software and IT Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Software and IT Services Portfolio $ 0.62 % |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.62% |
| Net Assets | $ 10,347,141,434 |
| Holdings Count | shares | 50 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 50 Portfolio Turnover 14 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Software 71.9 IT Services 15.5 Financial Services 5.2 Interactive Media & Services 3.6 Professional Services 1.1 Common Stocks 97.3 Short-Term Investments and Net Other Assets (Liabilities) 2.7 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 Ireland 2.7 France 1.4 Canada 0.5 Netherlands 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 25.0 Adobe Inc 8.1 Salesforce Inc 7.3 Autodesk Inc 3.1 Workday Inc Class A 2.9 Palo Alto Networks Inc 2.8 Accenture PLC Class A 2.7 Oracle Corp 2.4 Alphabet Inc Class A 2.2 Atlassian Corp Class A 2.1 58.6 |
| Fidelity Advisor Materials Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Materials Portfolio |
| Class Name | Fidelity Advisor® Materials Fund Class M |
| Trading Symbol | FMFTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 1.24 % |
| Expenses Paid, Amount | $ 64 |
| Expense Ratio, Percent | 1.24% |
| Net Assets | $ 849,835,612 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 59 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6 Metals & Mining 25.3 Containers & Packaging 7.9 Construction Materials 4.4 Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Linde PLC 19.1 Ecolab Inc 10.2 Dow Inc 6.9 Air Products and Chemicals Inc 5.4 Freeport-McMoRan Inc 5.0 Corteva Inc 3.9 Nucor Corp 3.9 Axalta Coating Systems Ltd 3.6 Chemours Co/The 3.3 First Quantum Minerals Ltd 2.4 63.7 |
| Select Telecommunications Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Telecommunications Portfolio |
| Class Name | Telecommunications Portfolio |
| Trading Symbol | FSTCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Telecommunications Portfolio $ 0.76 % |
| Expenses Paid, Amount | $ 41 |
| Expense Ratio, Percent | 0.76% |
| Net Assets | $ 196,158,282 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8 Wireless Telecommunication Services 12.7 Media 4.1 IT Services 0.6 Construction & Engineering 0.2 Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) AT&T Inc 23.3 Verizon Communications Inc 19.7 Lumen Technologies Inc 6.2 Cogent Communications Holdings Inc 4.9 T-Mobile US Inc 4.8 Iridium Communications Inc 4.8 Liberty Latin America Ltd Class C 4.0 Liberty Global Ltd Class C 3.5 Telephone and Data Systems Inc 3.4 Gogo Inc 2.9 77.5 |
| Fidelity Advisor Communication Services Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Communication Services Portfolio |
| Class Name | Fidelity Advisor® Communication Services Fund Class M |
| Trading Symbol | FGEMX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 1.21 % |
| Expenses Paid, Amount | $ 63 |
| Expense Ratio, Percent | 1.21% |
| Net Assets | $ 1,564,235,226 |
| Holdings Count | shares | 49 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 49 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6 Entertainment 22.6 Media 8.0 Diversified Telecommunication Services 7.9 Broadline Retail 5.3 Ground Transportation 2.5 IT Services 0.0 Consumer Staples Distribution & Retail 0.0 Software 0.0 Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 24.9 Alphabet Inc Class A 22.6 AT&T Inc 4.8 Walt Disney Co/The 4.6 Amazon.com Inc 4.6 Netflix Inc 4.6 Charter Communications Inc Class A 2.6 Uber Technologies Inc 2.5 Liberty Media Corp-Liberty Formula One Class A 2.3 Comcast Corp Class A 2.3 75.8 |
| Fidelity Advisor Materials Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Materials Portfolio |
| Class Name | Fidelity Advisor® Materials Fund Class Z |
| Trading Symbol | FIJFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.58 % |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 849,835,612 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 59 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6 Metals & Mining 25.3 Containers & Packaging 7.9 Construction Materials 4.4 Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Linde PLC 19.1 Ecolab Inc 10.2 Dow Inc 6.9 Air Products and Chemicals Inc 5.4 Freeport-McMoRan Inc 5.0 Corteva Inc 3.9 Nucor Corp 3.9 Axalta Coating Systems Ltd 3.6 Chemours Co/The 3.3 First Quantum Minerals Ltd 2.4 63.7 |
| Fidelity Advisor Communication Services Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Communication Services Portfolio |
| Class Name | Fidelity Advisor® Communication Services Fund Class Z |
| Trading Symbol | FGKMX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.58 % |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 1,564,235,226 |
| Holdings Count | shares | 49 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 49 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6 Entertainment 22.6 Media 8.0 Diversified Telecommunication Services 7.9 Broadline Retail 5.3 Ground Transportation 2.5 IT Services 0.0 Consumer Staples Distribution & Retail 0.0 Software 0.0 Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 24.9 Alphabet Inc Class A 22.6 AT&T Inc 4.8 Walt Disney Co/The 4.6 Amazon.com Inc 4.6 Netflix Inc 4.6 Charter Communications Inc Class A 2.6 Uber Technologies Inc 2.5 Liberty Media Corp-Liberty Formula One Class A 2.3 Comcast Corp Class A 2.3 75.8 |
| Select Industrials Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Industrials Portfolio |
| Class Name | Industrials Portfolio |
| Trading Symbol | FCYIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Industrials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Industrials Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 591,125,639 |
| Holdings Count | shares | 51 |
| Investment Company Portfolio Turnover | 37% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 51 Portfolio Turnover 37 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Aerospace & Defense 22.7 Machinery 19.6 Ground Transportation 13.2 Electrical Equipment 12.8 Building Products 11.5 Trading Companies & Distributors 5.7 Construction & Engineering 3.8 Professional Services 3.4 Commercial Services & Supplies 3.2 Others 3.7 Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) General Electric Co 6.4 Union Pacific Corp 5.1 Howmet Aerospace Inc 4.7 Parker-Hannifin Corp 4.3 Ingersoll Rand Inc 4.3 Trane Technologies PLC 4.1 TransDigm Group Inc 3.9 Boeing Co 3.8 GE Vernova Inc 3.4 Eaton Corp PLC 3.3 43.3 |
| Select Banking Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Banking Portfolio |
| Class Name | Banking Portfolio |
| Trading Symbol | FSRBX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Banking Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Banking Portfolio $ 0.71 % |
| Expenses Paid, Amount | $ 40 |
| Expense Ratio, Percent | 0.71% |
| Net Assets | $ 439,247,104 |
| Holdings Count | shares | 37 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 37 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Banks 97.6 Capital Markets 2.5 Financial Services 0.0 Consumer Finance 0.0 Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets) Short-Term Investments and Net Other Assets (Liabilities) - (0.1)% United States 94.9 Puerto Rico 5.1 Cyprus 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Wells Fargo & Co 7.5 Bank of America Corp 6.8 M&T Bank Corp 6.2 Citigroup Inc 5.6 US Bancorp 5.4 PNC Financial Services Group Inc/The 5.3 Popular Inc 5.1 KeyCorp 4.0 Heartland Financial USA Inc 3.5 Huntington Bancshares Inc/OH 3.4 52.8 |
| Fidelity Advisor Telecommunications Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Telecommunications Portfolio |
| Class Name | Fidelity Advisor® Telecommunications Fund Class Z |
| Trading Symbol | FIJGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.65 % |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.65% |
| Net Assets | $ 196,158,282 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8 Wireless Telecommunication Services 12.7 Media 4.1 IT Services 0.6 Construction & Engineering 0.2 Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) AT&T Inc 23.3 Verizon Communications Inc 19.7 Lumen Technologies Inc 6.2 Cogent Communications Holdings Inc 4.9 T-Mobile US Inc 4.8 Iridium Communications Inc 4.8 Liberty Latin America Ltd Class C 4.0 Liberty Global Ltd Class C 3.5 Telephone and Data Systems Inc 3.4 Gogo Inc 2.9 77.5 |
| Fidelity Advisor Gold Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Gold Portfolio |
| Class Name | Fidelity Advisor® Gold Fund Class M |
| Trading Symbol | FGDTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 1.22 % |
| Expenses Paid, Amount | $ 75 |
| Expense Ratio, Percent | 1.22% |
| Net Assets | $ 1,501,574,716 |
| Holdings Count | shares | 65 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 65 Portfolio Turnover 13 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4 Financial Services 0.0 *Includes gold bullion and/or silver bullion. Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Agnico Eagle Mines Ltd 14.8 Newmont Corp 11.6 Wheaton Precious Metals Corp 10.3 Franco-Nevada Corp 9.3 Barrick Gold Corp 4.9 Alamos Gold Inc Class A 4.1 Northern Star Resources Ltd 3.8 Osisko Gold Royalties Ltd 2.7 Anglogold Ashanti Plc 2.3 Lundin Gold Inc 2.3 66.1 |
| Select FinTech Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | FinTech Portfolio |
| Class Name | FinTech Portfolio |
| Trading Symbol | FSVLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about FinTech Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment FinTech Portfolio $ 0.76 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.76% |
| Net Assets | $ 98,348,487 |
| Holdings Count | shares | 25 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 25 Portfolio Turnover 31 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Financial Services 61.9 Consumer Finance 20.9 Software 12.3 IT Services 4.8 Common Stocks 99.9 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Netherlands 4.8 Canada 4.8 Brazil 0.5 United Kingdom 0.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Mastercard Inc Class A 12.7 American Express Co 12.1 Visa Inc Class A 11.7 Intuit Inc 11.1 Discover Financial Services 4.9 Fidelity National Information Services Inc 4.9 Fiserv Inc 4.9 Adyen NV 4.8 Shopify Inc Class A (United States) 4.8 Corpay Inc 4.8 76.7 |
| Select Gold Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Gold Portfolio |
| Class Name | Gold Portfolio |
| Trading Symbol | FSAGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Gold Portfolio $ 0.68 % |
| Expenses Paid, Amount | $ 42 |
| Expense Ratio, Percent | 0.68% |
| Net Assets | $ 1,501,574,716 |
| Holdings Count | shares | 65 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 65 Portfolio Turnover 13 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4 Financial Services 0.0 *Includes gold bullion and/or silver bullion. Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Agnico Eagle Mines Ltd 14.8 Newmont Corp 11.6 Wheaton Precious Metals Corp 10.3 Franco-Nevada Corp 9.3 Barrick Gold Corp 4.9 Alamos Gold Inc Class A 4.1 Northern Star Resources Ltd 3.8 Osisko Gold Royalties Ltd 2.7 Anglogold Ashanti Plc 2.3 Lundin Gold Inc 2.3 66.1 |
| Fidelity Advisor Materials Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Materials Portfolio |
| Class Name | Fidelity Advisor® Materials Fund Class I |
| Trading Symbol | FMFEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.72 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.72% |
| Net Assets | $ 849,835,612 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 59 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6 Metals & Mining 25.3 Containers & Packaging 7.9 Construction Materials 4.4 Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Linde PLC 19.1 Ecolab Inc 10.2 Dow Inc 6.9 Air Products and Chemicals Inc 5.4 Freeport-McMoRan Inc 5.0 Corteva Inc 3.9 Nucor Corp 3.9 Axalta Coating Systems Ltd 3.6 Chemours Co/The 3.3 First Quantum Minerals Ltd 2.4 63.7 |
| Select Communication Services Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Communication Services Portfolio |
| Class Name | Communication Services Portfolio |
| Trading Symbol | FBMPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Communication Services Portfolio $ 0.67 % |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.67% |
| Net Assets | $ 1,564,235,226 |
| Holdings Count | shares | 49 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 49 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6 Entertainment 22.6 Media 8.0 Diversified Telecommunication Services 7.9 Broadline Retail 5.3 Ground Transportation 2.5 IT Services 0.0 Consumer Staples Distribution & Retail 0.0 Software 0.0 Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 24.9 Alphabet Inc Class A 22.6 AT&T Inc 4.8 Walt Disney Co/The 4.6 Amazon.com Inc 4.6 Netflix Inc 4.6 Charter Communications Inc Class A 2.6 Uber Technologies Inc 2.5 Liberty Media Corp-Liberty Formula One Class A 2.3 Comcast Corp Class A 2.3 75.8 |
| Fidelity Advisor Materials Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Materials Portfolio |
| Class Name | Fidelity Advisor® Materials Fund Class C |
| Trading Symbol | FMFCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.74 % |
| Expenses Paid, Amount | $ 90 |
| Expense Ratio, Percent | 1.74% |
| Net Assets | $ 849,835,612 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 59 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6 Metals & Mining 25.3 Containers & Packaging 7.9 Construction Materials 4.4 Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Linde PLC 19.1 Ecolab Inc 10.2 Dow Inc 6.9 Air Products and Chemicals Inc 5.4 Freeport-McMoRan Inc 5.0 Corteva Inc 3.9 Nucor Corp 3.9 Axalta Coating Systems Ltd 3.6 Chemours Co/The 3.3 First Quantum Minerals Ltd 2.4 63.7 |
| Select Biotechnology Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Biotechnology Portfolio |
| Class Name | Biotechnology Portfolio |
| Trading Symbol | FBIOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Biotechnology Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Biotechnology Portfolio $ 0.64 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 5,008,216,225 |
| Holdings Count | shares | 200 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 200 Portfolio Turnover 31 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Biotechnology 92.2 Pharmaceuticals 7.1 Health Care Providers & Services 0.2 Health Care Technology 0.2 Life Sciences Tools & Services 0.1 Health Care Equipment & Supplies 0.0 Consumer Staples Distribution & Retail 0.0 Common Stocks 98.8 Preferred Stocks 1.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 88.7 Denmark 3.9 Netherlands 3.2 Belgium 2.0 United Kingdom 0.6 Switzerland 0.5 Canada 0.4 Ireland 0.4 France 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Abbvie Inc 11.0 Amgen Inc 9.7 Krystal Biotech Inc 7.4 Regeneron Pharmaceuticals Inc 5.3 Vertex Pharmaceuticals Inc 4.4 Alnylam Pharmaceuticals Inc 3.4 Gilead Sciences Inc 2.6 UCB SA 2.0 Zealand Pharma A/S 2.0 Ascendis Pharma A/S ADR 1.8 49.6 |
| Fidelity Environment and Alternative Energy Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Environment and Alternative Energy Fund |
| Class Name | Fidelity® Environment and Alternative Energy Fund |
| Trading Symbol | FSLEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Environment and Alternative Energy Fund for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Environment and Alternative Energy Fund $ 0.70 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 556,919,674 |
| Holdings Count | shares | 70 |
| Investment Company Portfolio Turnover | 36% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 70 Portfolio Turnover 36 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Software 10.8 Automobiles 9.4 Chemicals 9.1 Electrical Equipment 8.0 Semiconductors & Semiconductor Equipment 7.9 IT Services 6.8 Building Products 6.0 Commercial Services & Supplies 5.1 Ground Transportation 4.7 Others 32.1 Common Stocks 99.9 Preferred Stocks 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) United States 94.8 China 2.5 Japan 1.1 Denmark 0.8 Germany 0.5 Canada 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 10.8 Tesla Inc 8.8 Linde PLC 7.2 International Business Machines Corp 5.9 Union Pacific Corp 4.7 Prologis Inc 4.3 Eaton Corp PLC 3.8 Republic Services Inc 3.2 Trane Technologies PLC 3.1 Arista Networks Inc 2.8 54.6 |
| Select Automotive Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Automotive Portfolio |
| Class Name | Automotive Portfolio |
| Trading Symbol | FSAVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Automotive Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Automotive Portfolio $ 0.81 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.81% |
| Net Assets | $ 75,054,295 |
| Holdings Count | shares | 34 |
| Investment Company Portfolio Turnover | 64% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 34 Portfolio Turnover 64 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Automobiles 53.6 Specialty Retail 21.1 Automobile Components 11.0 Commercial Services & Supplies 6.3 Distributors 4.5 Ground Transportation 1.9 Trading Companies & Distributors 0.7 Consumer Staples Distribution & Retail 0.3 Electronic Equipment, Instruments & Components 0.0 Common Stocks 99.4 Preferred Stocks 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 70.9 Japan 13.4 Italy 8.1 China 4.8 Sweden 2.7 Luxembourg 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Tesla Inc 11.3 O'Reilly Automotive Inc 9.0 Toyota Motor Corp ADR 9.0 General Motors Co 8.2 Ferrari NV 8.1 Aptiv PLC 4.8 AutoZone Inc 4.6 Copart Inc 4.5 Honda Motor Co Ltd ADR 4.4 Li Auto Inc ADR 4.2 68.1 |
| Select Consumer Discretionary Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Consumer Discretionary Portfolio |
| Class Name | Consumer Discretionary Portfolio |
| Trading Symbol | FSCPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Consumer Discretionary Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Consumer Discretionary Portfolio $ 0.70 % |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 471,659,584 |
| Holdings Count | shares | 60 |
| Investment Company Portfolio Turnover | 23% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 60 Portfolio Turnover 23 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 26.0 Specialty Retail 23.9 Hotels, Restaurants & Leisure 19.3 Automobiles 11.7 Textiles, Apparel & Luxury Goods 8.3 Household Durables 5.4 Automobile Components 2.7 Consumer Staples Distribution & Retail 1.0 Building Products 0.8 Others 0.6 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.8 Canada 2.1 Brazil 1.0 United Kingdom 0.4 France 0.4 Switzerland 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Amazon.com Inc 23.9 Tesla Inc 10.0 Home Depot Inc/The 4.8 Lowe's Cos Inc 4.7 TJX Cos Inc/The 3.7 Hilton Worldwide Holdings Inc 3.1 McDonald's Corp 2.6 Dick's Sporting Goods Inc 2.3 NIKE Inc Class B 2.3 Aptiv PLC 2.2 59.6 |
| Fidelity Advisor Gold Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Gold Portfolio |
| Class Name | Fidelity Advisor® Gold Fund Class A |
| Trading Symbol | FGDAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.97 % |
| Expenses Paid, Amount | $ 60 |
| Expense Ratio, Percent | 0.97% |
| Net Assets | $ 1,501,574,716 |
| Holdings Count | shares | 65 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 65 Portfolio Turnover 13 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4 Financial Services 0.0 *Includes gold bullion and/or silver bullion. Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Agnico Eagle Mines Ltd 14.8 Newmont Corp 11.6 Wheaton Precious Metals Corp 10.3 Franco-Nevada Corp 9.3 Barrick Gold Corp 4.9 Alamos Gold Inc Class A 4.1 Northern Star Resources Ltd 3.8 Osisko Gold Royalties Ltd 2.7 Anglogold Ashanti Plc 2.3 Lundin Gold Inc 2.3 66.1 |
| Select Semiconductors Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Semiconductors Portfolio |
| Class Name | Semiconductors Portfolio |
| Trading Symbol | FSELX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Semiconductors Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Semiconductors Portfolio $ 0.63 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.63% |
| Net Assets | $ 19,711,434,026 |
| Holdings Count | shares | 42 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 42 Portfolio Turnover 42 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 94.3 Technology Hardware, Storage & Peripherals 2.8 Electronic Equipment, Instruments & Components 0.1 Financial Services 0.0 Metals & Mining 0.0 Software 0.0 Common Stocks 97.0 Preferred Stocks 0.2 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 2.8 ASSET ALLOCATION (% of Fund's net assets) United States 78.1 Taiwan 8.1 China 6.3 Netherlands 4.9 Israel 1.6 Japan 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 24.8 Taiwan Semiconductor Manufacturing Co Ltd ADR 7.7 ON Semiconductor Corp 7.2 NXP Semiconductors NV 6.3 Marvell Technology Inc 5.0 Broadcom Inc 4.9 ASML Holding NV depository receipt 4.9 Micron Technology Inc 4.9 GlobalFoundries Inc 4.8 Monolithic Power Systems Inc 4.3 74.8 |
| Select Brokerage and Investment Management Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Brokerage and Investment Management Portfolio |
| Class Name | Brokerage and Investment Management Portfolio |
| Trading Symbol | FSLBX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Brokerage and Investment Management Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Brokerage and Investment Management Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 917,253,584 |
| Holdings Count | shares | 41 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 41 Portfolio Turnover 21 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Capital Markets 95.8 Financial Services 3.9 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 97.0 United Kingdom 1.1 Luxembourg 0.7 Grand Cayman (UK Overseas Ter) 0.6 Canada 0.5 Sweden 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Moody's Corp 9.3 KKR & Co Inc Class A 6.4 S&P Global Inc 5.4 Blackstone Inc 5.2 Ares Management Corp Class A 5.1 Intercontinental Exchange Inc 5.1 Blue Owl Capital Inc Class A 5.0 BlackRock Inc 4.6 Ameriprise Financial Inc 4.4 Apollo Global Management Inc 3.9 54.4 |
| Select Chemicals Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Chemicals Portfolio |
| Class Name | Chemicals Portfolio |
| Trading Symbol | FSCHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Chemicals Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Chemicals Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 610,081,738 |
| Holdings Count | shares | 26 |
| Investment Company Portfolio Turnover | 2% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 26 Portfolio Turnover 2 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Chemicals 99.1 Common Stocks 99.1 Short-Term Investments and Net Other Assets (Liabilities) 0.9 ASSET ALLOCATION (% of Fund's net assets) United States 97.8 Germany 2.2 Argentina 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Linde PLC 23.4 Sherwin-Williams Co/The 11.3 Air Products and Chemicals Inc 8.9 Ecolab Inc 5.9 Axalta Coating Systems Ltd 4.9 Element Solutions Inc 4.5 DuPont de Nemours Inc 4.3 Corteva Inc 4.1 Celanese Corp 3.8 Westlake Corp 3.5 74.6 |
| Fidelity Advisor Communication Services Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Communication Services Portfolio |
| Class Name | Fidelity Advisor® Communication Services Fund Class I |
| Trading Symbol | FGJMX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.71 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.71% |
| Net Assets | $ 1,564,235,226 |
| Holdings Count | shares | 49 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 49 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6 Entertainment 22.6 Media 8.0 Diversified Telecommunication Services 7.9 Broadline Retail 5.3 Ground Transportation 2.5 IT Services 0.0 Consumer Staples Distribution & Retail 0.0 Software 0.0 Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 24.9 Alphabet Inc Class A 22.6 AT&T Inc 4.8 Walt Disney Co/The 4.6 Amazon.com Inc 4.6 Netflix Inc 4.6 Charter Communications Inc Class A 2.6 Uber Technologies Inc 2.5 Liberty Media Corp-Liberty Formula One Class A 2.3 Comcast Corp Class A 2.3 75.8 |
| Select Tech Hardware Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Tech Hardware Portfolio |
| Class Name | Tech Hardware Portfolio |
| Trading Symbol | FDCPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Tech Hardware Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Tech Hardware Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 1,022,851,445 |
| Holdings Count | shares | 34 |
| Investment Company Portfolio Turnover | 47% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 34 Portfolio Turnover 47 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Technology Hardware, Storage & Peripherals 38.5 Communications Equipment 28.7 Software 7.9 Electronic Equipment, Instruments & Components 7.5 Entertainment 4.9 Household Durables 4.6 Semiconductors & Semiconductor Equipment 4.5 Interactive Media & Services 1.2 Common Stocks 97.7 Preferred Stocks 0.1 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets) United States 68.2 Japan 15.5 Korea (South) 12.0 Taiwan 3.3 China 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Cisco Systems Inc 12.9 Samsung Electronics Co Ltd 12.0 Apple Inc 11.0 Motorola Solutions Inc 6.9 Arista Networks Inc 6.7 Nintendo Co Ltd 4.9 Palo Alto Networks Inc 4.7 Sony Group Corp 4.6 CDW Corp/DE 4.5 FUJIFILM Holdings Corp 4.0 72.2 |
| Fidelity Advisor Gold Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Gold Portfolio |
| Class Name | Fidelity Advisor® Gold Fund Class C |
| Trading Symbol | FGDCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Gold Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.72 % |
| Expenses Paid, Amount | $ 106 |
| Expense Ratio, Percent | 1.72% |
| Net Assets | $ 1,501,574,716 |
| Holdings Count | shares | 65 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 65 Portfolio Turnover 13 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 98.4 Financial Services 0.0 *Includes gold bullion and/or silver bullion. Common Stocks 98.4 Other Investments 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) Canada 60.3 United States 15.8 Brazil 10.3 Australia 6.3 United Kingdom 2.3 South Africa 1.9 China 1.5 Burkina Faso 1.3 Egypt 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Agnico Eagle Mines Ltd 14.8 Newmont Corp 11.6 Wheaton Precious Metals Corp 10.3 Franco-Nevada Corp 9.3 Barrick Gold Corp 4.9 Alamos Gold Inc Class A 4.1 Northern Star Resources Ltd 3.8 Osisko Gold Royalties Ltd 2.7 Anglogold Ashanti Plc 2.3 Lundin Gold Inc 2.3 66.1 |
| Fidelity Advisor Materials Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Materials Portfolio |
| Class Name | Fidelity Advisor® Materials Fund Class A |
| Trading Symbol | FMFAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.99 % |
| Expenses Paid, Amount | $ 51 |
| Expense Ratio, Percent | 0.99% |
| Net Assets | $ 849,835,612 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 59 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6 Metals & Mining 25.3 Containers & Packaging 7.9 Construction Materials 4.4 Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Linde PLC 19.1 Ecolab Inc 10.2 Dow Inc 6.9 Air Products and Chemicals Inc 5.4 Freeport-McMoRan Inc 5.0 Corteva Inc 3.9 Nucor Corp 3.9 Axalta Coating Systems Ltd 3.6 Chemours Co/The 3.3 First Quantum Minerals Ltd 2.4 63.7 |
| Fidelity Advisor Telecommunications Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Telecommunications Portfolio |
| Class Name | Fidelity Advisor® Telecommunications Fund Class M |
| Trading Symbol | FTUTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 1.31 % |
| Expenses Paid, Amount | $ 71 |
| Expense Ratio, Percent | 1.31% |
| Net Assets | $ 196,158,282 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8 Wireless Telecommunication Services 12.7 Media 4.1 IT Services 0.6 Construction & Engineering 0.2 Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) AT&T Inc 23.3 Verizon Communications Inc 19.7 Lumen Technologies Inc 6.2 Cogent Communications Holdings Inc 4.9 T-Mobile US Inc 4.8 Iridium Communications Inc 4.8 Liberty Latin America Ltd Class C 4.0 Liberty Global Ltd Class C 3.5 Telephone and Data Systems Inc 3.4 Gogo Inc 2.9 77.5 |
| Fidelity Advisor Telecommunications Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Telecommunications Portfolio |
| Class Name | Fidelity Advisor® Telecommunications Fund Class A |
| Trading Symbol | FTUAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 1.06 % |
| Expenses Paid, Amount | $ 57 |
| Expense Ratio, Percent | 1.06% |
| Net Assets | $ 196,158,282 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8 Wireless Telecommunication Services 12.7 Media 4.1 IT Services 0.6 Construction & Engineering 0.2 Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) AT&T Inc 23.3 Verizon Communications Inc 19.7 Lumen Technologies Inc 6.2 Cogent Communications Holdings Inc 4.9 T-Mobile US Inc 4.8 Iridium Communications Inc 4.8 Liberty Latin America Ltd Class C 4.0 Liberty Global Ltd Class C 3.5 Telephone and Data Systems Inc 3.4 Gogo Inc 2.9 77.5 |
| Fidelity Advisor Communication Services Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Communication Services Portfolio |
| Class Name | Fidelity Advisor® Communication Services Fund Class A |
| Trading Symbol | FGDMX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.96 % |
| Expenses Paid, Amount | $ 50 |
| Expense Ratio, Percent | 0.96% |
| Net Assets | $ 1,564,235,226 |
| Holdings Count | shares | 49 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 49 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6 Entertainment 22.6 Media 8.0 Diversified Telecommunication Services 7.9 Broadline Retail 5.3 Ground Transportation 2.5 IT Services 0.0 Consumer Staples Distribution & Retail 0.0 Software 0.0 Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 24.9 Alphabet Inc Class A 22.6 AT&T Inc 4.8 Walt Disney Co/The 4.6 Amazon.com Inc 4.6 Netflix Inc 4.6 Charter Communications Inc Class A 2.6 Uber Technologies Inc 2.5 Liberty Media Corp-Liberty Formula One Class A 2.3 Comcast Corp Class A 2.3 75.8 |
| Select Pharmaceuticals Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Pharmaceuticals Portfolio |
| Class Name | Pharmaceuticals Portfolio |
| Trading Symbol | FPHAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Pharmaceuticals Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Pharmaceuticals Portfolio $ 0.68 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.68% |
| Net Assets | $ 1,914,838,050 |
| Holdings Count | shares | 73 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 73 Portfolio Turnover 14 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Pharmaceuticals 74.0 Biotechnology 20.4 Life Sciences Tools & Services 1.0 Health Care Equipment & Supplies 0.8 Health Care Providers & Services 0.2 Financial Services 0.1 Software 0.1 Consumer Staples Distribution & Retail 0.0 Common Stocks 96.2 Preferred Stocks 0.4 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 3.4 ASSET ALLOCATION (% of Fund's net assets) United States 66.8 Denmark 13.6 United Kingdom 8.8 Belgium 5.9 Germany 3.2 Switzerland 0.6 Netherlands 0.6 Canada 0.5 Ireland 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Eli Lilly & Co 24.0 Novo Nordisk A/S Class B ADR 13.3 Astrazeneca PLC ADR 8.8 Bristol-Myers Squibb Co 5.1 UCB SA 4.7 GSK PLC ADR 4.5 Merck & Co Inc 4.2 Gilead Sciences Inc 3.2 Legend Biotech Corp ADR 2.5 Dyne Therapeutics Inc 2.2 72.5 |
| Select Consumer Staples Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Consumer Staples Portfolio |
| Class Name | Consumer Staples Portfolio |
| Trading Symbol | FDFAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Consumer Staples Portfolio $ 0.68 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.68% |
| Net Assets | $ 1,405,206,341 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6 Household Products 18.8 Food Products 14.3 Consumer Staples Distribution & Retail 10.8 Personal Care Products 9.7 Tobacco 6.4 Oil, Gas & Consumable Fuels 0.1 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Coca-Cola Co/The 14.2 Procter & Gamble Co/The 14.2 Keurig Dr Pepper Inc 9.8 Kenvue Inc 6.3 Walmart Inc 5.5 Philip Morris International Inc 4.2 Monster Beverage Corp 3.9 Energizer Holdings Inc 3.8 PepsiCo Inc 3.6 Estee Lauder Cos Inc/The Class A 3.4 68.9 |
| Select Medical Technology and Devices Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Medical Technology and Devices Portfolio |
| Class Name | Medical Technology and Devices Portfolio |
| Trading Symbol | FSMEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Medical Technology and Devices Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Medical Technology and Devices Portfolio $ 0.63 % |
| Expenses Paid, Amount | $ 32 |
| Expense Ratio, Percent | 0.63% |
| Net Assets | $ 5,352,945,554 |
| Holdings Count | shares | 64 |
| Investment Company Portfolio Turnover | 34% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 64 Portfolio Turnover 34 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Health Care Equipment & Supplies 55.0 Life Sciences Tools & Services 32.6 Health Care Technology 5.3 Biotechnology 3.5 Health Care Providers & Services 1.8 Textiles, Apparel & Luxury Goods 0.4 Financial Services 0.3 Pharmaceuticals 0.1 Common Stocks 96.6 Preferred Stocks 2.4 Preferred Securities 0.3 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets) United States 98.5 France 0.7 Canada 0.5 Japan 0.3 China 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Boston Scientific Corp 13.1 Danaher Corp 12.7 Thermo Fisher Scientific Inc 9.4 Intuitive Surgical Inc 8.4 Stryker Corp 6.7 Abbott Laboratories 4.8 Penumbra Inc 4.6 Insulet Corp 4.2 Veeva Systems Inc Class A 3.1 IQVIA Holdings Inc 3.1 70.1 |
| Fidelity Advisor Telecommunications Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Telecommunications Portfolio |
| Class Name | Fidelity Advisor® Telecommunications Fund Class I |
| Trading Symbol | FTUIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.76 % |
| Expenses Paid, Amount | $ 41 |
| Expense Ratio, Percent | 0.76% |
| Net Assets | $ 196,158,282 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8 Wireless Telecommunication Services 12.7 Media 4.1 IT Services 0.6 Construction & Engineering 0.2 Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) AT&T Inc 23.3 Verizon Communications Inc 19.7 Lumen Technologies Inc 6.2 Cogent Communications Holdings Inc 4.9 T-Mobile US Inc 4.8 Iridium Communications Inc 4.8 Liberty Latin America Ltd Class C 4.0 Liberty Global Ltd Class C 3.5 Telephone and Data Systems Inc 3.4 Gogo Inc 2.9 77.5 |
| Select Enterprise Technology Services Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Enterprise Technology Services Portfolio |
| Class Name | Enterprise Technology Services Portfolio |
| Trading Symbol | FBSOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Enterprise Technology Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Enterprise Technology Services Portfolio $ 0.66 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.66% |
| Net Assets | $ 1,702,201,601 |
| Holdings Count | shares | 34 |
| Investment Company Portfolio Turnover | 65% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 34 Portfolio Turnover 65 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Financial Services 59.5 IT Services 24.0 Professional Services 8.2 Software 4.7 Broadline Retail 1.8 Interactive Media & Services 1.6 Common Stocks 99.8 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 90.8 Ireland 7.4 Germany 1.8 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Visa Inc Class A 21.6 Mastercard Inc Class A 20.4 Accenture PLC Class A 7.4 Fiserv Inc 4.9 International Business Machines Corp 3.9 Automatic Data Processing Inc 3.7 Fidelity National Information Services Inc 3.7 Gartner Inc 3.6 Block Inc Class A 3.4 Corpay Inc 3.2 75.8 |
| Select Wireless Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Wireless Portfolio |
| Class Name | Wireless Portfolio |
| Trading Symbol | FWRLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Wireless Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Wireless Portfolio $ 0.73 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.73% |
| Net Assets | $ 339,625,936 |
| Holdings Count | shares | 41 |
| Investment Company Portfolio Turnover | 38% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 41 Portfolio Turnover 38 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Technology Hardware, Storage & Peripherals 22.0 Diversified Telecommunication Services 18.4 Semiconductors & Semiconductor Equipment 18.2 Wireless Telecommunication Services 10.6 Specialized REITs 10.6 Communications Equipment 6.2 Interactive Media & Services 4.6 Broadline Retail 2.9 Entertainment 2.8 Others 2.8 Common Stocks 99.1 Short-Term Investments and Net Other Assets (Liabilities) 0.9 ASSET ALLOCATION (% of Fund's net assets) United States 83.7 Canada 2.7 Korea (South) 2.3 China 2.0 Belgium 2.0 Spain 1.9 Singapore 1.6 India 1.3 Finland 1.1 Others 1.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Apple Inc 19.7 AT&T Inc 10.9 American Tower Corp 8.7 Marvell Technology Inc 7.4 QUALCOMM Inc 4.8 Motorola Solutions Inc 4.8 T-Mobile US Inc 4.6 United States Cellular Corp 3.0 Amazon.com Inc 2.9 Spotify Technology SA 2.8 69.6 |
| Fidelity Advisor Telecommunications Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Telecommunications Portfolio |
| Class Name | Fidelity Advisor® Telecommunications Fund Class C |
| Trading Symbol | FTUCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Telecommunications Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.81 % |
| Expenses Paid, Amount | $ 98 |
| Expense Ratio, Percent | 1.81% |
| Net Assets | $ 196,158,282 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 75.8 Wireless Telecommunication Services 12.7 Media 4.1 IT Services 0.6 Construction & Engineering 0.2 Common Stocks 93.4 Short-Term Investments and Net Other Assets (Liabilities) 6.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.5 Puerto Rico 4.0 Belgium 3.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) AT&T Inc 23.3 Verizon Communications Inc 19.7 Lumen Technologies Inc 6.2 Cogent Communications Holdings Inc 4.9 T-Mobile US Inc 4.8 Iridium Communications Inc 4.8 Liberty Latin America Ltd Class C 4.0 Liberty Global Ltd Class C 3.5 Telephone and Data Systems Inc 3.4 Gogo Inc 2.9 77.5 |
| Select Leisure Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Leisure Portfolio |
| Class Name | Leisure Portfolio |
| Trading Symbol | FDLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Leisure Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Leisure Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 630,585,620 |
| Holdings Count | shares | 40 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 40 Portfolio Turnover 42 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Hotels, Restaurants & Leisure 94.8 Consumer Staples Distribution & Retail 1.4 Diversified Consumer Services 1.2 Leisure Products 1.1 Entertainment 0.6 Food Products 0.5 Financial Services 0.2 Common Stocks 99.8 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 95.2 Canada 2.8 United Kingdom 2.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) McDonald's Corp 16.2 Booking Holdings Inc 10.9 Starbucks Corp 8.9 Hilton Worldwide Holdings Inc 8.1 Marriott International Inc/MD Class A1 5.8 Chipotle Mexican Grill Inc 4.8 Airbnb Inc Class A 4.8 Royal Caribbean Cruises Ltd 4.3 Yum! Brands Inc 3.8 Restaurant Brands International Inc 2.8 70.4 |
| Fidelity Advisor Consumer Staples Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Consumer Staples Portfolio |
| Class Name | Fidelity Advisor® Consumer Staples Fund Class A |
| Trading Symbol | FDAGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 0.97 % |
| Expenses Paid, Amount | $ 51 |
| Expense Ratio, Percent | 0.97% |
| Net Assets | $ 1,405,206,341 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6 Household Products 18.8 Food Products 14.3 Consumer Staples Distribution & Retail 10.8 Personal Care Products 9.7 Tobacco 6.4 Oil, Gas & Consumable Fuels 0.1 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Coca-Cola Co/The 14.2 Procter & Gamble Co/The 14.2 Keurig Dr Pepper Inc 9.8 Kenvue Inc 6.3 Walmart Inc 5.5 Philip Morris International Inc 4.2 Monster Beverage Corp 3.9 Energizer Holdings Inc 3.8 PepsiCo Inc 3.6 Estee Lauder Cos Inc/The Class A 3.4 68.9 |
| Fidelity Advisor Communication Services Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Communication Services Portfolio |
| Class Name | Fidelity Advisor® Communication Services Fund Class C |
| Trading Symbol | FGHMX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Communication Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.71 % |
| Expenses Paid, Amount | $ 90 |
| Expense Ratio, Percent | 1.71% |
| Net Assets | $ 1,564,235,226 |
| Holdings Count | shares | 49 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 49 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 52.6 Entertainment 22.6 Media 8.0 Diversified Telecommunication Services 7.9 Broadline Retail 5.3 Ground Transportation 2.5 IT Services 0.0 Consumer Staples Distribution & Retail 0.0 Software 0.0 Common Stocks 98.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Puerto Rico 1.8 Belgium 1.3 Singapore 1.2 China 0.7 France 0.7 Japan 0.5 Canada 0.1 United Kingdom 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 24.9 Alphabet Inc Class A 22.6 AT&T Inc 4.8 Walt Disney Co/The 4.6 Amazon.com Inc 4.6 Netflix Inc 4.6 Charter Communications Inc Class A 2.6 Uber Technologies Inc 2.5 Liberty Media Corp-Liberty Formula One Class A 2.3 Comcast Corp Class A 2.3 75.8 |
| Select Defense and Aerospace Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Defense and Aerospace Portfolio |
| Class Name | Defense and Aerospace Portfolio |
| Trading Symbol | FSDAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Defense and Aerospace Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Defense and Aerospace Portfolio $ 0.66 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.66% |
| Net Assets | $ 1,763,712,595 |
| Holdings Count | shares | 31 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 31 Portfolio Turnover 42 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Aerospace & Defense 96.0 Metals & Mining 1.8 Professional Services 0.8 Trading Companies & Distributors 0.5 Common Stocks 99.1 Short-Term Investments and Net Other Assets (Liabilities) 0.9 ASSET ALLOCATION (% of Fund's net assets) United States 95.3 United Kingdom 2.2 Canada 1.0 Germany 0.8 France 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) General Electric Co 16.0 Boeing Co 10.1 RTX Corp 9.8 Lockheed Martin Corp 8.5 General Dynamics Corp 5.7 HEICO Corp Class A 4.9 Howmet Aerospace Inc 4.9 TransDigm Group Inc 4.7 Northrop Grumman Corp 4.5 Axon Enterprise Inc 3.8 72.9 |
| Select Transportation Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Transportation Portfolio |
| Class Name | Transportation Portfolio |
| Trading Symbol | FSRFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Transportation Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Transportation Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 541,061,408 |
| Holdings Count | shares | 40 |
| Investment Company Portfolio Turnover | 24% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 40 Portfolio Turnover 24 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Ground Transportation 53.8 Air Freight & Logistics 20.7 Passenger Airlines 14.2 Marine Transportation 6.9 Oil, Gas & Consumable Fuels 1.5 Energy Equipment & Services 0.7 Common Stocks 97.8 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets) United States 93.8 Panama 2.1 Greece 1.6 Canada 0.8 Italy 0.7 Brazil 0.7 Monaco 0.3 Bermuda 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Union Pacific Corp 18.5 Uber Technologies Inc 15.3 United Parcel Service Inc Class B 10.9 Norfolk Southern Corp 5.3 CSX Corp 4.9 FedEx Corp 4.9 Kirby Corp 4.3 Delta Air Lines Inc 3.9 Alaska Air Group Inc 2.6 SkyWest Inc 2.5 73.1 |
| Select Health Care Services Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Health Care Services Portfolio |
| Class Name | Health Care Services Portfolio |
| Trading Symbol | FSHCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Health Care Services Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Health Care Services Portfolio $ 0.67 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.67% |
| Net Assets | $ 1,395,684,497 |
| Holdings Count | shares | 30 |
| Investment Company Portfolio Turnover | 66% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 30 Portfolio Turnover 66 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Health Care Providers & Services 99.6 Health Care Technology 0.4 Common Stocks 99.6 Preferred Stocks 0.4 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) UnitedHealth Group Inc 24.7 Cigna Group/The 9.4 CVS Health Corp 8.3 McKesson Corp 5.4 Humana Inc 4.4 Elevance Health Inc 4.4 Cencora Inc 4.4 Molina Healthcare Inc 3.7 Centene Corp 3.5 HCA Healthcare Inc 3.3 71.5 |
| Select Materials Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Materials Portfolio |
| Class Name | Materials Portfolio |
| Trading Symbol | FSDPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Materials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Materials Portfolio $ 0.70 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 849,835,612 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 59% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 59 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Chemicals 61.6 Metals & Mining 25.3 Containers & Packaging 7.9 Construction Materials 4.4 Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets) United States 89.9 Canada 6.0 Zambia 2.4 Brazil 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Linde PLC 19.1 Ecolab Inc 10.2 Dow Inc 6.9 Air Products and Chemicals Inc 5.4 Freeport-McMoRan Inc 5.0 Corteva Inc 3.9 Nucor Corp 3.9 Axalta Coating Systems Ltd 3.6 Chemours Co/The 3.3 First Quantum Minerals Ltd 2.4 63.7 |
| Select Insurance Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Insurance Portfolio |
| Class Name | Insurance Portfolio |
| Trading Symbol | FSPCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Insurance Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Insurance Portfolio $ 0.70 % |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 847,602,456 |
| Holdings Count | shares | 24 |
| Investment Company Portfolio Turnover | 46% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 24 Portfolio Turnover 46 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Insurance 92.9 Financial Services 4.9 Common Stocks 97.8 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets) United States 98.0 Australia 2.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Chubb Ltd 9.9 Marsh & McLennan Cos Inc 9.7 Arthur J Gallagher & Co 9.2 Hartford Financial Services Group Inc/The 8.8 Travelers Cos Inc/The 7.7 Progressive Corp/The 4.8 Reinsurance Group of America Inc 4.8 MetLife Inc 4.7 Arch Capital Group Ltd 4.7 Brown & Brown Inc 4.6 68.9 |
| Select Health Care Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Health Care Portfolio |
| Class Name | Health Care Portfolio |
| Trading Symbol | FSPHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Health Care Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Health Care Portfolio $ 0.63 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.63% |
| Net Assets | $ 7,810,818,412 |
| Holdings Count | shares | 105 |
| Investment Company Portfolio Turnover | 35% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 105 Portfolio Turnover 35 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Health Care Equipment & Supplies 24.3 Biotechnology 23.5 Health Care Providers & Services 22.5 Pharmaceuticals 16.6 Life Sciences Tools & Services 10.5 Health Care Technology 2.1 Financial Services 0.1 Common Stocks 98.1 Preferred Stocks 1.5 Preferred Securities 0.2 Bonds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets) United States 91.9 Netherlands 2.7 United Kingdom 1.7 Denmark 1.5 Belgium 1.4 Canada 0.7 Israel 0.1 China 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) UnitedHealth Group Inc 10.8 Boston Scientific Corp 9.4 Eli Lilly & Co 8.4 Danaher Corp 5.9 Regeneron Pharmaceuticals Inc 4.2 Merck & Co Inc 3.8 Penumbra Inc 3.5 Cigna Group/The 3.2 Stryker Corp 2.6 Insulet Corp 2.5 54.3 |
| Select Construction and Housing Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Construction and Housing Portfolio |
| Class Name | Construction and Housing Portfolio |
| Trading Symbol | FSHOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Construction and Housing Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Construction and Housing Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 815,270,742 |
| Holdings Count | shares | 52 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 52 Portfolio Turnover 31 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Specialty Retail 33.3 Building Products 22.3 Household Durables 14.4 Residential REITs 10.8 Construction & Engineering 9.0 Construction Materials 8.7 Trading Companies & Distributors 0.4 Chemicals 0.3 Real Estate Management & Development 0.2 Ground Transportation 0.2 Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Home Depot Inc/The 17.2 Lowe's Cos Inc 13.2 Trane Technologies PLC 4.9 Johnson Controls International plc 4.6 CRH PLC 3.9 Martin Marietta Materials Inc 3.1 PulteGroup Inc 2.9 Invitation Homes Inc 2.9 Quanta Services Inc 2.7 Carrier Global Corp 2.6 58.0 |
| Select Financials Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Financials Portfolio |
| Class Name | Financials Portfolio |
| Trading Symbol | FIDSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Financials Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Financials Portfolio $ 0.70 % |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.70% |
| Net Assets | $ 783,287,308 |
| Holdings Count | shares | 65 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 65 Portfolio Turnover 31 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Banks 34.5 Financial Services 21.0 Capital Markets 20.5 Insurance 18.8 Consumer Finance 3.9 Professional Services 1.0 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 93.2 United Kingdom 4.0 Puerto Rico 1.8 Grand Cayman (UK Overseas Ter) 0.6 Mexico 0.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Mastercard Inc Class A 10.0 Wells Fargo & Co 6.5 Bank of America Corp 5.3 Citigroup Inc 2.9 Morgan Stanley 2.5 M&T Bank Corp 2.4 Apollo Global Management Inc 2.3 Chubb Ltd 2.3 Reinsurance Group of America Inc 2.2 Marsh & McLennan Cos Inc 2.1 38.5 |
| Select Energy Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Energy Portfolio |
| Class Name | Energy Portfolio |
| Trading Symbol | FSENX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Energy Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Energy Portfolio $ 0.66 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.66% |
| Net Assets | $ 2,159,619,676 |
| Holdings Count | shares | 45 |
| Investment Company Portfolio Turnover | 19% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 45 Portfolio Turnover 19 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.6 Energy Equipment & Services 15.5 Independent Power and Renewable Electricity Producers 1.7 Machinery 0.8 Common Stocks 98.6 Short-Term Investments and Net Other Assets (Liabilities) 1.4 ASSET ALLOCATION (% of Fund's net assets) United States 82.8 Canada 13.5 United Kingdom 3.1 Norway 0.3 France 0.1 Cameroon 0.1 United Arab Emirates 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Exxon Mobil Corp 24.9 Cenovus Energy Inc 5.9 Schlumberger NV 5.0 Chevron Corp 5.0 Marathon Petroleum Corp 4.9 Canadian Natural Resources Ltd 4.8 Cheniere Energy Inc 4.4 Occidental Petroleum Corp 3.6 Valero Energy Corp 3.6 Diamondback Energy Inc 3.3 65.4 |
| Select Retailing Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Retailing Portfolio |
| Class Name | Retailing Portfolio |
| Trading Symbol | FSRPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Retailing Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Retailing Portfolio $ 0.64 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 2,883,461,931 |
| Holdings Count | shares | 45 |
| Investment Company Portfolio Turnover | 29% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 45 Portfolio Turnover 29 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Specialty Retail 36.6 Broadline Retail 30.0 Consumer Staples Distribution & Retail 17.7 Textiles, Apparel & Luxury Goods 12.5 Interactive Media & Services 1.3 Household Durables 0.9 Hotels, Restaurants & Leisure 0.5 Automobile Components 0.3 Common Stocks 99.8 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 91.0 Canada 4.6 Brazil 1.6 France 1.0 United Kingdom 1.0 Germany 0.8 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Amazon.com Inc 25.3 Home Depot Inc/The 7.5 Walmart Inc 6.9 Lowe's Cos Inc 6.6 TJX Cos Inc/The 4.7 NIKE Inc Class B 4.2 O'Reilly Automotive Inc 3.7 Costco Wholesale Corp 2.8 Deckers Outdoor Corp 2.7 BJ's Wholesale Club Holdings Inc 2.6 67.0 |
| Fidelity Advisor Consumer Staples Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Consumer Staples Portfolio |
| Class Name | Fidelity Advisor® Consumer Staples Fund Class I |
| Trading Symbol | FDIGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Consumer Staples Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.71 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.71% |
| Net Assets | $ 1,405,206,341 |
| Holdings Count | shares | 39 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 39 Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Beverages 39.6 Household Products 18.8 Food Products 14.3 Consumer Staples Distribution & Retail 10.8 Personal Care Products 9.7 Tobacco 6.4 Oil, Gas & Consumable Fuels 0.1 Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 95.1 United Kingdom 4.8 Canada 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Coca-Cola Co/The 14.2 Procter & Gamble Co/The 14.2 Keurig Dr Pepper Inc 9.8 Kenvue Inc 6.3 Walmart Inc 5.5 Philip Morris International Inc 4.2 Monster Beverage Corp 3.9 Energizer Holdings Inc 3.8 PepsiCo Inc 3.6 Estee Lauder Cos Inc/The Class A 3.4 68.9 |
| Select Technology Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Technology Portfolio |
| Class Name | Technology Portfolio |
| Trading Symbol | FSPTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Technology Portfolio for the period March 1, 2024 to August 31, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Technology Portfolio $ 0.62 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.62% |
| Net Assets | $ 15,833,587,650 |
| Holdings Count | shares | 92 |
| Investment Company Portfolio Turnover | 43% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 92 Portfolio Turnover 43 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 42.0 Software 21.1 Technology Hardware, Storage & Peripherals 20.4 IT Services 4.0 Communications Equipment 2.3 Ground Transportation 2.3 Broadline Retail 1.6 Electronic Equipment, Instruments & Components 0.8 Entertainment 0.6 Others 0.6 Common Stocks 94.8 Preferred Stocks 0.9 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 4.3 ASSET ALLOCATION (% of Fund's net assets) United States 91.4 China 4.0 Taiwan 2.0 Canada 1.3 Netherlands 1.2 United Kingdom 0.1 Estonia 0.0 Korea (South) 0.0 Israel 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 20.4 Apple Inc 18.7 Microsoft Corp 10.7 Marvell Technology Inc 4.3 ON Semiconductor Corp 4.3 Servicenow Inc 4.1 NXP Semiconductors NV 3.9 Salesforce Inc 2.8 GlobalFoundries Inc 2.6 Okta Inc Class A 2.6 74.4 |
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| Fidelity Natural Resources Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.50% |
| Fidelity Natural Resources Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Fidelity Natural Resources Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| Fidelity Natural Resources Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Natural Resources Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Natural Resources Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Natural Resources Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Natural Resources Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Natural Resources Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Natural Resources Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Natural Resources Fund | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 70.10% |
| Fidelity Natural Resources Fund | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18% |
| Fidelity Natural Resources Fund | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Natural Resources Fund | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Natural Resources Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 58.80% |
| Fidelity Natural Resources Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Natural Resources Fund | Portugal | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Natural Resources Fund | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Natural Resources Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Natural Resources Fund | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Natural Resources Fund | Ghana | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Natural Resources Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.30% |
| Fidelity Natural Resources Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Utilities Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Select Utilities Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Select Utilities Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Select Utilities Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Select Utilities Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Select Utilities Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Select Utilities Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Utilities Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Utilities Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Utilities Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Select Utilities Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 62.20% |
| Select Utilities Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.20% |
| Select Utilities Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| Select Utilities Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Select Utilities Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| Select Utilities Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99% |
| Select Utilities Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.60% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Consumer Staples Fund - Class Z | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.10% |
| Fidelity Advisor Consumer Staples Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class Z | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Consumer Staples Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Fidelity Advisor Consumer Staples Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Consumer Staples Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Consumer Staples Fund - Class M | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.60% |
| Fidelity Advisor Consumer Staples Fund - Class M | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| Fidelity Advisor Consumer Staples Fund - Class M | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| Fidelity Advisor Consumer Staples Fund - Class M | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor Consumer Staples Fund - Class M | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Advisor Consumer Staples Fund - Class M | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Consumer Staples Fund - Class M | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.10% |
| Fidelity Advisor Consumer Staples Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class M | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Consumer Staples Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Fidelity Advisor Consumer Staples Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Gold Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Fidelity Advisor Gold Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor Gold Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor Gold Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Gold Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Gold Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Gold Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor Gold Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class Z | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class Z | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Gold Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Advisor Gold Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.30% |
| Fidelity Advisor Gold Fund - Class Z | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class Z | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class Z | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Gold Fund - Class Z | South Africa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Gold Fund - Class Z | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Gold Fund - Class Z | Burkina Faso | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Gold Fund - Class Z | Egypt | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Gold Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Gold Fund - Class Z | AAOtherInvestmentsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Gold Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Fidelity Advisor Gold Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor Gold Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor Gold Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Gold Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Gold Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Gold Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor Gold Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class I | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class I | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Gold Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Advisor Gold Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.30% |
| Fidelity Advisor Gold Fund - Class I | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class I | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class I | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Gold Fund - Class I | South Africa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Gold Fund - Class I | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Gold Fund - Class I | Burkina Faso | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Gold Fund - Class I | Egypt | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Gold Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Gold Fund - Class I | AAOtherInvestmentsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Consumer Staples Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Consumer Staples Fund - Class C | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.60% |
| Fidelity Advisor Consumer Staples Fund - Class C | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| Fidelity Advisor Consumer Staples Fund - Class C | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| Fidelity Advisor Consumer Staples Fund - Class C | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor Consumer Staples Fund - Class C | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Advisor Consumer Staples Fund - Class C | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Consumer Staples Fund - Class C | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.10% |
| Fidelity Advisor Consumer Staples Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class C | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Consumer Staples Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Fidelity Advisor Consumer Staples Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Software and IT Services Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25% |
| Select Software and IT Services Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Select Software and IT Services Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Select Software and IT Services Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Select Software and IT Services Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Select Software and IT Services Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Software and IT Services Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Software and IT Services Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Select Software and IT Services Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Software and IT Services Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Select Software and IT Services Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 71.90% |
| Select Software and IT Services Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.50% |
| Select Software and IT Services Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Select Software and IT Services Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Select Software and IT Services Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Software and IT Services Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.10% |
| Select Software and IT Services Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Software and IT Services Portfolio | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Software and IT Services Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Select Software and IT Services Portfolio | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Software and IT Services Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.30% |
| Select Software and IT Services Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor Materials Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| Fidelity Advisor Materials Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Fidelity Advisor Materials Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Advisor Materials Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor Materials Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Materials Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Materials Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor Materials Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class M | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| Fidelity Advisor Materials Fund - Class M | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.30% |
| Fidelity Advisor Materials Fund - Class M | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Materials Fund - Class M | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Advisor Materials Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.90% |
| Fidelity Advisor Materials Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Materials Fund - Class M | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class M | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Materials Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.20% |
| Fidelity Advisor Materials Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Telecommunications Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.30% |
| Select Telecommunications Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Select Telecommunications Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Select Telecommunications Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Telecommunications Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Telecommunications Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Telecommunications Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Select Telecommunications Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Select Telecommunications Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Telecommunications Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Select Telecommunications Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.80% |
| Select Telecommunications Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Select Telecommunications Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Select Telecommunications Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Telecommunications Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Telecommunications Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.50% |
| Select Telecommunications Portfolio | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Select Telecommunications Portfolio | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Select Telecommunications Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.40% |
| Select Telecommunications Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Advisor Communication Services Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Fidelity Advisor Communication Services Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Communication Services Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Communication Services Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class M | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.60% |
| Fidelity Advisor Communication Services Fund - Class M | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class M | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Advisor Communication Services Fund - Class M | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Communication Services Fund - Class M | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Communication Services Fund - Class M | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class M | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class M | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class M | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.70% |
| Fidelity Advisor Communication Services Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Communication Services Fund - Class M | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class M | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class M | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class M | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Communication Services Fund - Class M | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Communication Services Fund - Class M | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Communication Services Fund - Class M | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Communication Services Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.90% |
| Fidelity Advisor Communication Services Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Materials Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| Fidelity Advisor Materials Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Fidelity Advisor Materials Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Advisor Materials Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor Materials Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Materials Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Materials Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor Materials Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class Z | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| Fidelity Advisor Materials Fund - Class Z | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.30% |
| Fidelity Advisor Materials Fund - Class Z | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Materials Fund - Class Z | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Advisor Materials Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.90% |
| Fidelity Advisor Materials Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Materials Fund - Class Z | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class Z | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Materials Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.20% |
| Fidelity Advisor Materials Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Communication Services Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Fidelity Advisor Communication Services Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Communication Services Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Communication Services Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class Z | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.60% |
| Fidelity Advisor Communication Services Fund - Class Z | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class Z | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Advisor Communication Services Fund - Class Z | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Communication Services Fund - Class Z | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Communication Services Fund - Class Z | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class Z | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class Z | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class Z | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.70% |
| Fidelity Advisor Communication Services Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Communication Services Fund - Class Z | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class Z | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class Z | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class Z | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Communication Services Fund - Class Z | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Communication Services Fund - Class Z | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Communication Services Fund - Class Z | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Communication Services Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.90% |
| Fidelity Advisor Communication Services Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Industrials Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Select Industrials Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Select Industrials Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Industrials Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Industrials Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Industrials Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Select Industrials Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Industrials Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Industrials Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Industrials Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Select Industrials Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.70% |
| Select Industrials Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| Select Industrials Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Select Industrials Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| Select Industrials Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Select Industrials Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Select Industrials Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Industrials Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Industrials Portfolio | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Select Industrials Portfolio | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Select Industrials Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| Select Industrials Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.60% |
| Select Industrials Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Banking Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Select Banking Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Select Banking Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Select Banking Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Select Banking Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Select Banking Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Select Banking Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Select Banking Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Select Banking Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Select Banking Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Banking Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Select Banking Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Select Banking Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Banking Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Banking Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.90% |
| Select Banking Portfolio | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Select Banking Portfolio | Cyprus | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Banking Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100.10% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.30% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Telecommunications Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Telecommunications Fund - Class Z | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.80% |
| Fidelity Advisor Telecommunications Fund - Class Z | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Fidelity Advisor Telecommunications Fund - Class Z | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Telecommunications Fund - Class Z | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Telecommunications Fund - Class Z | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Advisor Telecommunications Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.50% |
| Fidelity Advisor Telecommunications Fund - Class Z | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class Z | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.40% |
| Fidelity Advisor Telecommunications Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Advisor Gold Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Fidelity Advisor Gold Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor Gold Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor Gold Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Gold Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Gold Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Gold Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor Gold Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class M | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class M | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Gold Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Advisor Gold Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.30% |
| Fidelity Advisor Gold Fund - Class M | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class M | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class M | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Gold Fund - Class M | South Africa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Gold Fund - Class M | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Gold Fund - Class M | Burkina Faso | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Gold Fund - Class M | Egypt | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Gold Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Gold Fund - Class M | AAOtherInvestmentsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Select FinTech Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Select FinTech Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.10% |
| Select FinTech Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Select FinTech Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Select FinTech Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select FinTech Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select FinTech Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select FinTech Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select FinTech Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select FinTech Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select FinTech Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.90% |
| Select FinTech Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Select FinTech Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Select FinTech Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select FinTech Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Select FinTech Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select FinTech Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select FinTech Portfolio | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select FinTech Portfolio | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select FinTech Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.90% |
| Select FinTech Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Gold Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Select Gold Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Select Gold Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Select Gold Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Select Gold Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Gold Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Select Gold Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Gold Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Gold Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Gold Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Gold Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Select Gold Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Gold Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Select Gold Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.30% |
| Select Gold Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Gold Portfolio | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Select Gold Portfolio | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Select Gold Portfolio | South Africa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Select Gold Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Select Gold Portfolio | Burkina Faso | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Select Gold Portfolio | Egypt | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Gold Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Select Gold Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Gold Portfolio | AAOtherInvestmentsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Materials Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| Fidelity Advisor Materials Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Fidelity Advisor Materials Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Advisor Materials Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor Materials Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Materials Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Materials Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor Materials Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class I | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| Fidelity Advisor Materials Fund - Class I | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.30% |
| Fidelity Advisor Materials Fund - Class I | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Materials Fund - Class I | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Advisor Materials Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.90% |
| Fidelity Advisor Materials Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Materials Fund - Class I | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class I | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Materials Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.20% |
| Fidelity Advisor Materials Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Communication Services Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Select Communication Services Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Select Communication Services Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Communication Services Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Communication Services Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Communication Services Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Communication Services Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Communication Services Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Select Communication Services Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Communication Services Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Communication Services Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.60% |
| Select Communication Services Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Select Communication Services Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Select Communication Services Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Select Communication Services Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Select Communication Services Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Select Communication Services Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Communication Services Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Communication Services Portfolio | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Communication Services Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.70% |
| Select Communication Services Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Communication Services Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Communication Services Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Communication Services Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Communication Services Portfolio | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Select Communication Services Portfolio | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Select Communication Services Portfolio | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Select Communication Services Portfolio | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Communication Services Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.90% |
| Select Communication Services Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Materials Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| Fidelity Advisor Materials Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Fidelity Advisor Materials Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Advisor Materials Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor Materials Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Materials Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Materials Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor Materials Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class C | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| Fidelity Advisor Materials Fund - Class C | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.30% |
| Fidelity Advisor Materials Fund - Class C | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Materials Fund - Class C | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Advisor Materials Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.90% |
| Fidelity Advisor Materials Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Materials Fund - Class C | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class C | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Materials Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.20% |
| Fidelity Advisor Materials Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Biotechnology Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Select Biotechnology Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Select Biotechnology Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Select Biotechnology Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Select Biotechnology Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Biotechnology Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Biotechnology Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Biotechnology Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Biotechnology Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Biotechnology Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Select Biotechnology Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.20% |
| Select Biotechnology Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Select Biotechnology Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Biotechnology Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Biotechnology Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Biotechnology Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Biotechnology Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Biotechnology Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 88.70% |
| Select Biotechnology Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Biotechnology Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Biotechnology Portfolio | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Biotechnology Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Biotechnology Portfolio | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Select Biotechnology Portfolio | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Biotechnology Portfolio | Denmark | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Biotechnology Portfolio | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Biotechnology Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.80% |
| Select Biotechnology Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Biotechnology Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Environment and Alternative Energy Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Environment and Alternative Energy Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Fidelity Environment and Alternative Energy Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| Fidelity Environment and Alternative Energy Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Environment and Alternative Energy Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Environment and Alternative Energy Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Environment and Alternative Energy Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Environment and Alternative Energy Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Environment and Alternative Energy Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Environment and Alternative Energy Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Environment and Alternative Energy Fund | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Environment and Alternative Energy Fund | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Environment and Alternative Energy Fund | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| Fidelity Environment and Alternative Energy Fund | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Environment and Alternative Energy Fund | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Environment and Alternative Energy Fund | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Environment and Alternative Energy Fund | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Environment and Alternative Energy Fund | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Fidelity Environment and Alternative Energy Fund | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Environment and Alternative Energy Fund | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.10% |
| Fidelity Environment and Alternative Energy Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| Fidelity Environment and Alternative Energy Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Environment and Alternative Energy Fund | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Environment and Alternative Energy Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Environment and Alternative Energy Fund | Denmark | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Environment and Alternative Energy Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Environment and Alternative Energy Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.90% |
| Fidelity Environment and Alternative Energy Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Environment and Alternative Energy Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Automotive Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Select Automotive Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Select Automotive Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Select Automotive Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Select Automotive Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Select Automotive Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Automotive Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Automotive Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Automotive Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Automotive Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Select Automotive Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.60% |
| Select Automotive Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.10% |
| Select Automotive Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Select Automotive Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Select Automotive Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Automotive Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Select Automotive Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Automotive Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Automotive Portfolio | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Automotive Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 70.90% |
| Select Automotive Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Automotive Portfolio | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.40% |
| Select Automotive Portfolio | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Select Automotive Portfolio | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Automotive Portfolio | Luxembourg | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Automotive Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.40% |
| Select Automotive Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Automotive Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Consumer Discretionary Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.90% |
| Select Consumer Discretionary Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Select Consumer Discretionary Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Consumer Discretionary Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Consumer Discretionary Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Select Consumer Discretionary Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Select Consumer Discretionary Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Consumer Discretionary Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Consumer Discretionary Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Consumer Discretionary Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Consumer Discretionary Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| Select Consumer Discretionary Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.90% |
| Select Consumer Discretionary Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.30% |
| Select Consumer Discretionary Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Select Consumer Discretionary Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| Select Consumer Discretionary Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Select Consumer Discretionary Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Consumer Discretionary Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Consumer Discretionary Portfolio | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Consumer Discretionary Portfolio | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Consumer Discretionary Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.80% |
| Select Consumer Discretionary Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Select Consumer Discretionary Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Consumer Discretionary Portfolio | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Consumer Discretionary Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Consumer Discretionary Portfolio | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Consumer Discretionary Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Select Consumer Discretionary Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Gold Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Fidelity Advisor Gold Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor Gold Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor Gold Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Gold Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Gold Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Gold Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor Gold Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class A | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class A | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Gold Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Advisor Gold Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.30% |
| Fidelity Advisor Gold Fund - Class A | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class A | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class A | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Gold Fund - Class A | South Africa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Gold Fund - Class A | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Gold Fund - Class A | Burkina Faso | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Gold Fund - Class A | Egypt | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Gold Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Gold Fund - Class A | AAOtherInvestmentsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Select Semiconductors Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.80% |
| Select Semiconductors Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| Select Semiconductors Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| Select Semiconductors Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Select Semiconductors Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Select Semiconductors Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Semiconductors Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Semiconductors Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Semiconductors Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Semiconductors Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Semiconductors Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.30% |
| Select Semiconductors Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Semiconductors Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Semiconductors Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Semiconductors Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Semiconductors Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Semiconductors Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 78.10% |
| Select Semiconductors Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Select Semiconductors Portfolio | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Semiconductors Portfolio | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Semiconductors Portfolio | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Select Semiconductors Portfolio | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Select Semiconductors Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97% |
| Select Semiconductors Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Semiconductors Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Semiconductors Portfolio | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Brokerage and Investment Management Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Select Brokerage and Investment Management Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Select Brokerage and Investment Management Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Select Brokerage and Investment Management Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Select Brokerage and Investment Management Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Select Brokerage and Investment Management Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Select Brokerage and Investment Management Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Select Brokerage and Investment Management Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Brokerage and Investment Management Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Brokerage and Investment Management Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Brokerage and Investment Management Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.80% |
| Select Brokerage and Investment Management Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Brokerage and Investment Management Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97% |
| Select Brokerage and Investment Management Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Brokerage and Investment Management Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Brokerage and Investment Management Portfolio | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Brokerage and Investment Management Portfolio | Luxembourg | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Brokerage and Investment Management Portfolio | GrandCaymanUKOverseasTerMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Brokerage and Investment Management Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Select Brokerage and Investment Management Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Chemicals Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.40% |
| Select Chemicals Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Select Chemicals Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Select Chemicals Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Select Chemicals Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Chemicals Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Chemicals Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Chemicals Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Select Chemicals Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Chemicals Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Select Chemicals Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.10% |
| Select Chemicals Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.80% |
| Select Chemicals Portfolio | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Chemicals Portfolio | Argentina | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Chemicals Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.10% |
| Select Chemicals Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Communication Services Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Fidelity Advisor Communication Services Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Communication Services Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Communication Services Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class I | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.60% |
| Fidelity Advisor Communication Services Fund - Class I | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class I | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Advisor Communication Services Fund - Class I | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Communication Services Fund - Class I | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Communication Services Fund - Class I | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class I | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class I | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class I | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.70% |
| Fidelity Advisor Communication Services Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Communication Services Fund - Class I | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class I | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class I | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class I | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Communication Services Fund - Class I | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Communication Services Fund - Class I | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Communication Services Fund - Class I | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Communication Services Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.90% |
| Fidelity Advisor Communication Services Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Tech Hardware Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| Select Tech Hardware Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12% |
| Select Tech Hardware Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Select Tech Hardware Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Select Tech Hardware Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Select Tech Hardware Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Tech Hardware Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Tech Hardware Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Tech Hardware Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Tech Hardware Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Select Tech Hardware Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.50% |
| Select Tech Hardware Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.70% |
| Select Tech Hardware Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Select Tech Hardware Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Select Tech Hardware Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Tech Hardware Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Tech Hardware Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Tech Hardware Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Select Tech Hardware Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 68.20% |
| Select Tech Hardware Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Tech Hardware Portfolio | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.50% |
| Select Tech Hardware Portfolio | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Select Tech Hardware Portfolio | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12% |
| Select Tech Hardware Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Select Tech Hardware Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Tech Hardware Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Gold Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Fidelity Advisor Gold Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor Gold Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor Gold Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Gold Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Gold Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Gold Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor Gold Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class C | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class C | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Gold Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Advisor Gold Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.30% |
| Fidelity Advisor Gold Fund - Class C | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Gold Fund - Class C | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Advisor Gold Fund - Class C | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Gold Fund - Class C | South Africa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Gold Fund - Class C | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Gold Fund - Class C | Burkina Faso | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Gold Fund - Class C | Egypt | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Gold Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.40% |
| Fidelity Advisor Gold Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Gold Fund - Class C | AAOtherInvestmentsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Materials Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| Fidelity Advisor Materials Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Fidelity Advisor Materials Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Advisor Materials Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor Materials Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Materials Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Materials Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Materials Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor Materials Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class A | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| Fidelity Advisor Materials Fund - Class A | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.30% |
| Fidelity Advisor Materials Fund - Class A | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Materials Fund - Class A | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Advisor Materials Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.90% |
| Fidelity Advisor Materials Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Materials Fund - Class A | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor Materials Fund - Class A | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Materials Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.20% |
| Fidelity Advisor Materials Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Telecommunications Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.30% |
| Fidelity Advisor Telecommunications Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Fidelity Advisor Telecommunications Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Telecommunications Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Telecommunications Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Telecommunications Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Telecommunications Fund - Class M | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.80% |
| Fidelity Advisor Telecommunications Fund - Class M | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Fidelity Advisor Telecommunications Fund - Class M | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Telecommunications Fund - Class M | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Telecommunications Fund - Class M | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Advisor Telecommunications Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.50% |
| Fidelity Advisor Telecommunications Fund - Class M | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class M | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.40% |
| Fidelity Advisor Telecommunications Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Advisor Telecommunications Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.30% |
| Fidelity Advisor Telecommunications Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Fidelity Advisor Telecommunications Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Telecommunications Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Telecommunications Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Telecommunications Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Telecommunications Fund - Class A | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.80% |
| Fidelity Advisor Telecommunications Fund - Class A | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Fidelity Advisor Telecommunications Fund - Class A | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Telecommunications Fund - Class A | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Telecommunications Fund - Class A | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Advisor Telecommunications Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.50% |
| Fidelity Advisor Telecommunications Fund - Class A | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class A | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.40% |
| Fidelity Advisor Telecommunications Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Advisor Communication Services Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Fidelity Advisor Communication Services Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Communication Services Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Communication Services Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class A | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.60% |
| Fidelity Advisor Communication Services Fund - Class A | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class A | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Advisor Communication Services Fund - Class A | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Communication Services Fund - Class A | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Communication Services Fund - Class A | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class A | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class A | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class A | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.70% |
| Fidelity Advisor Communication Services Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Communication Services Fund - Class A | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class A | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class A | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class A | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Communication Services Fund - Class A | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Communication Services Fund - Class A | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Communication Services Fund - Class A | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Communication Services Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.90% |
| Fidelity Advisor Communication Services Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Pharmaceuticals Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24% |
| Select Pharmaceuticals Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| Select Pharmaceuticals Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Select Pharmaceuticals Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Select Pharmaceuticals Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Pharmaceuticals Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Pharmaceuticals Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Select Pharmaceuticals Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Select Pharmaceuticals Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Select Pharmaceuticals Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Pharmaceuticals Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 74% |
| Select Pharmaceuticals Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.40% |
| Select Pharmaceuticals Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Pharmaceuticals Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Pharmaceuticals Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Pharmaceuticals Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Pharmaceuticals Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Pharmaceuticals Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Pharmaceuticals Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 66.80% |
| Select Pharmaceuticals Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Pharmaceuticals Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Select Pharmaceuticals Portfolio | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Pharmaceuticals Portfolio | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Pharmaceuticals Portfolio | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Select Pharmaceuticals Portfolio | Denmark | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Select Pharmaceuticals Portfolio | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Pharmaceuticals Portfolio | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Select Pharmaceuticals Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 96.20% |
| Select Pharmaceuticals Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Pharmaceuticals Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Pharmaceuticals Portfolio | AABondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Consumer Staples Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Select Consumer Staples Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Select Consumer Staples Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Select Consumer Staples Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Select Consumer Staples Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Select Consumer Staples Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Select Consumer Staples Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Consumer Staples Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Consumer Staples Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Select Consumer Staples Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Consumer Staples Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.60% |
| Select Consumer Staples Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| Select Consumer Staples Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| Select Consumer Staples Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Select Consumer Staples Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Select Consumer Staples Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Select Consumer Staples Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Consumer Staples Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.10% |
| Select Consumer Staples Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Consumer Staples Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Consumer Staples Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Select Consumer Staples Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Medical Technology and Devices Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.10% |
| Select Medical Technology and Devices Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Select Medical Technology and Devices Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Select Medical Technology and Devices Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Select Medical Technology and Devices Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Select Medical Technology and Devices Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Medical Technology and Devices Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Medical Technology and Devices Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Select Medical Technology and Devices Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Select Medical Technology and Devices Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Select Medical Technology and Devices Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55% |
| Select Medical Technology and Devices Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.60% |
| Select Medical Technology and Devices Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Select Medical Technology and Devices Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Select Medical Technology and Devices Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Select Medical Technology and Devices Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Medical Technology and Devices Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Medical Technology and Devices Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Medical Technology and Devices Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.50% |
| Select Medical Technology and Devices Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Medical Technology and Devices Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Medical Technology and Devices Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Medical Technology and Devices Portfolio | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Medical Technology and Devices Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 96.60% |
| Select Medical Technology and Devices Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Medical Technology and Devices Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Select Medical Technology and Devices Portfolio | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Medical Technology and Devices Portfolio | AABondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Telecommunications Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.30% |
| Fidelity Advisor Telecommunications Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Fidelity Advisor Telecommunications Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Telecommunications Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Telecommunications Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Telecommunications Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Telecommunications Fund - Class I | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.80% |
| Fidelity Advisor Telecommunications Fund - Class I | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Fidelity Advisor Telecommunications Fund - Class I | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Telecommunications Fund - Class I | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Telecommunications Fund - Class I | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Advisor Telecommunications Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.50% |
| Fidelity Advisor Telecommunications Fund - Class I | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class I | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.40% |
| Fidelity Advisor Telecommunications Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Select Enterprise Technology Services Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.60% |
| Select Enterprise Technology Services Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.40% |
| Select Enterprise Technology Services Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Select Enterprise Technology Services Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Enterprise Technology Services Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Enterprise Technology Services Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Select Enterprise Technology Services Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Select Enterprise Technology Services Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Select Enterprise Technology Services Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Select Enterprise Technology Services Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Select Enterprise Technology Services Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 59.50% |
| Select Enterprise Technology Services Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24% |
| Select Enterprise Technology Services Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Select Enterprise Technology Services Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Enterprise Technology Services Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Select Enterprise Technology Services Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Select Enterprise Technology Services Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 90.80% |
| Select Enterprise Technology Services Portfolio | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Select Enterprise Technology Services Portfolio | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Select Enterprise Technology Services Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.80% |
| Select Enterprise Technology Services Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Wireless Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Select Wireless Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Select Wireless Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Select Wireless Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Select Wireless Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Wireless Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Wireless Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Wireless Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Select Wireless Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Select Wireless Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Wireless Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22% |
| Select Wireless Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.40% |
| Select Wireless Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.20% |
| Select Wireless Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Select Wireless Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Select Wireless Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Select Wireless Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Wireless Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Select Wireless Portfolio | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Wireless Portfolio | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Wireless Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 83.70% |
| Select Wireless Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Wireless Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Wireless Portfolio | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Wireless Portfolio | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Select Wireless Portfolio | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Wireless Portfolio | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Select Wireless Portfolio | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Select Wireless Portfolio | Finland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Wireless Portfolio | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Select Wireless Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.10% |
| Select Wireless Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Telecommunications Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.30% |
| Fidelity Advisor Telecommunications Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.70% |
| Fidelity Advisor Telecommunications Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Telecommunications Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Telecommunications Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Telecommunications Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Telecommunications Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Telecommunications Fund - Class C | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 75.80% |
| Fidelity Advisor Telecommunications Fund - Class C | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Fidelity Advisor Telecommunications Fund - Class C | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Telecommunications Fund - Class C | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Telecommunications Fund - Class C | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Advisor Telecommunications Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.50% |
| Fidelity Advisor Telecommunications Fund - Class C | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Advisor Telecommunications Fund - Class C | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Telecommunications Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.40% |
| Fidelity Advisor Telecommunications Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Select Leisure Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Select Leisure Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Select Leisure Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Select Leisure Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Select Leisure Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Select Leisure Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Leisure Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Leisure Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Leisure Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Leisure Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Leisure Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| Select Leisure Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Select Leisure Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Select Leisure Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Leisure Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Leisure Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Leisure Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Leisure Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.20% |
| Select Leisure Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Leisure Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Leisure Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.80% |
| Select Leisure Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Consumer Staples Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Consumer Staples Fund - Class A | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.60% |
| Fidelity Advisor Consumer Staples Fund - Class A | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| Fidelity Advisor Consumer Staples Fund - Class A | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| Fidelity Advisor Consumer Staples Fund - Class A | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor Consumer Staples Fund - Class A | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Advisor Consumer Staples Fund - Class A | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Consumer Staples Fund - Class A | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.10% |
| Fidelity Advisor Consumer Staples Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class A | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Consumer Staples Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Fidelity Advisor Consumer Staples Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Communication Services Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Fidelity Advisor Communication Services Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Communication Services Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Communication Services Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Communication Services Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Advisor Communication Services Fund - Class C | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.60% |
| Fidelity Advisor Communication Services Fund - Class C | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor Communication Services Fund - Class C | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Advisor Communication Services Fund - Class C | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Communication Services Fund - Class C | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Communication Services Fund - Class C | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Communication Services Fund - Class C | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class C | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class C | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.70% |
| Fidelity Advisor Communication Services Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Communication Services Fund - Class C | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Communication Services Fund - Class C | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class C | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Communication Services Fund - Class C | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Communication Services Fund - Class C | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Communication Services Fund - Class C | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Communication Services Fund - Class C | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Communication Services Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.90% |
| Fidelity Advisor Communication Services Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Select Defense and Aerospace Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16% |
| Select Defense and Aerospace Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| Select Defense and Aerospace Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Select Defense and Aerospace Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| Select Defense and Aerospace Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Select Defense and Aerospace Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Defense and Aerospace Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Defense and Aerospace Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Defense and Aerospace Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Select Defense and Aerospace Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Defense and Aerospace Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 96% |
| Select Defense and Aerospace Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Select Defense and Aerospace Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Defense and Aerospace Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Defense and Aerospace Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Select Defense and Aerospace Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Defense and Aerospace Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Defense and Aerospace Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Defense and Aerospace Portfolio | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Defense and Aerospace Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.10% |
| Select Defense and Aerospace Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Select Transportation Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.50% |
| Select Transportation Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.30% |
| Select Transportation Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Select Transportation Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Select Transportation Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Transportation Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Transportation Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Transportation Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Transportation Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Transportation Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Select Transportation Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.80% |
| Select Transportation Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Select Transportation Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Select Transportation Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Select Transportation Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Select Transportation Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Transportation Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Select Transportation Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Transportation Portfolio | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Transportation Portfolio | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Transportation Portfolio | Panama | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Select Transportation Portfolio | Greece | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Select Transportation Portfolio | Monaco | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Transportation Portfolio | Bermuda | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Transportation Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.80% |
| Select Transportation Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Health Care Services Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.70% |
| Select Health Care Services Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Select Health Care Services Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| Select Health Care Services Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Select Health Care Services Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Health Care Services Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Health Care Services Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Health Care Services Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Select Health Care Services Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Select Health Care Services Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Select Health Care Services Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.60% |
| Select Health Care Services Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Health Care Services Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| Select Health Care Services Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.60% |
| Select Health Care Services Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Health Care Services Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Materials Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| Select Materials Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Select Materials Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Select Materials Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Select Materials Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Select Materials Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Materials Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Materials Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Select Materials Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Select Materials Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Select Materials Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| Select Materials Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.30% |
| Select Materials Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Select Materials Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Materials Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.90% |
| Select Materials Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Select Materials Portfolio | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Select Materials Portfolio | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Select Materials Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.20% |
| Select Materials Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Insurance Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Select Insurance Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Select Insurance Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Select Insurance Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Select Insurance Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| Select Insurance Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Insurance Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Insurance Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Insurance Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Insurance Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Insurance Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.90% |
| Select Insurance Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Insurance Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98% |
| Select Insurance Portfolio | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Insurance Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.80% |
| Select Insurance Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Health Care Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Select Health Care Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Select Health Care Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Select Health Care Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Select Health Care Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Select Health Care Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Select Health Care Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Select Health Care Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Select Health Care Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Health Care Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Select Health Care Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.30% |
| Select Health Care Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Select Health Care Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.50% |
| Select Health Care Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.60% |
| Select Health Care Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.50% |
| Select Health Care Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Select Health Care Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Health Care Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 91.90% |
| Select Health Care Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Select Health Care Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Select Health Care Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Health Care Portfolio | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Health Care Portfolio | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Select Health Care Portfolio | Denmark | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Select Health Care Portfolio | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Health Care Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.10% |
| Select Health Care Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Health Care Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Select Health Care Portfolio | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Health Care Portfolio | AABondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Construction and Housing Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.20% |
| Select Construction and Housing Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Select Construction and Housing Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Construction and Housing Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Construction and Housing Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Construction and Housing Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Select Construction and Housing Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Select Construction and Housing Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Select Construction and Housing Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Construction and Housing Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Construction and Housing Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Select Construction and Housing Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.30% |
| Select Construction and Housing Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| Select Construction and Housing Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Select Construction and Housing Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Select Construction and Housing Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Select Construction and Housing Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Construction and Housing Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Construction and Housing Portfolio | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Construction and Housing Portfolio | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Select Construction and Housing Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| Select Construction and Housing Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.60% |
| Select Construction and Housing Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Financials Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Select Financials Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Select Financials Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Select Financials Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Select Financials Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Select Financials Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Select Financials Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Financials Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Financials Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Select Financials Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Select Financials Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.50% |
| Select Financials Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21% |
| Select Financials Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.50% |
| Select Financials Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| Select Financials Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Financials Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Financials Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.20% |
| Select Financials Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Select Financials Portfolio | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Select Financials Portfolio | GrandCaymanUKOverseasTerMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Financials Portfolio | Mexico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Select Financials Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Select Financials Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Energy Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.90% |
| Select Energy Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Select Energy Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Select Energy Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Select Energy Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Select Energy Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Select Energy Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Select Energy Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Select Energy Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Select Energy Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Select Energy Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 80.60% |
| Select Energy Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.50% |
| Select Energy Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Select Energy Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Energy Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 82.80% |
| Select Energy Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.50% |
| Select Energy Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Select Energy Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Energy Portfolio | Norway | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Energy Portfolio | Cameroon | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Energy Portfolio | United Arab Emirates | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Energy Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.60% |
| Select Energy Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Select Retailing Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.30% |
| Select Retailing Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Select Retailing Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Select Retailing Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Select Retailing Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Select Retailing Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Select Retailing Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Select Retailing Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Retailing Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Select Retailing Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Retailing Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.60% |
| Select Retailing Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30% |
| Select Retailing Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Select Retailing Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| Select Retailing Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Select Retailing Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Select Retailing Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Select Retailing Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Retailing Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 91% |
| Select Retailing Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Select Retailing Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Retailing Portfolio | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Select Retailing Portfolio | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Select Retailing Portfolio | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Retailing Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.80% |
| Select Retailing Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Consumer Staples Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Advisor Consumer Staples Fund - Class I | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.60% |
| Fidelity Advisor Consumer Staples Fund - Class I | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| Fidelity Advisor Consumer Staples Fund - Class I | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.30% |
| Fidelity Advisor Consumer Staples Fund - Class I | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor Consumer Staples Fund - Class I | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Advisor Consumer Staples Fund - Class I | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Consumer Staples Fund - Class I | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.10% |
| Fidelity Advisor Consumer Staples Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Consumer Staples Fund - Class I | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Consumer Staples Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.70% |
| Fidelity Advisor Consumer Staples Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Select Technology Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.40% |
| Select Technology Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| Select Technology Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.70% |
| Select Technology Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Technology Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Technology Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Select Technology Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Select Technology Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Select Technology Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Technology Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Select Technology Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 42% |
| Select Technology Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.10% |
| Select Technology Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.40% |
| Select Technology Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Select Technology Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Technology Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Select Technology Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Select Technology Portfolio | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Select Technology Portfolio | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Technology Portfolio | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Select Technology Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 91.40% |
| Select Technology Portfolio | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Select Technology Portfolio | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Select Technology Portfolio | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Select Technology Portfolio | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Select Technology Portfolio | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Select Technology Portfolio | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Technology Portfolio | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Technology Portfolio | Estonia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Select Technology Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| Select Technology Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Select Technology Portfolio | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Select Technology Portfolio | AABondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
