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Shareholder Report
 6 Months Ended
Jan. 31, 2026
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 Jan. 31, 2026
Fidelity Real Estate Investment Portfolio  
Shareholder Report [Line Items]  
Fund Name Fidelity® Real Estate Investment Portfolio
Class Name Fidelity® Real Estate Investment Portfolio
Trading Symbol FRESX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Real Estate Investment Portfolio for the period August 1, 2025 to January 31, 2026.
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® Real Estate Investment Portfolio 
$ 32 
0.62%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.62%
Net Assets $ 3,050,854,347
Holdings Count | shares 42
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,050,854,347
  
Number of Holdings
42
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 33.5   Retail REITs 17.5   Industrial REITs 15.3   Health Care REITs 12.9   Residential REITs 11.7   Real Estate Management & Development 8.4       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 100.0                         
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Prologis Inc 10.0   Equinix Inc 8.9   Welltower Inc 8.6   American Tower Corp 8.2   NNN REIT Inc 4.4   Kimco Realty Corp 4.3   Public Storage 4.1   CBRE Group Inc Class A 3.9   Digital Realty Trust Inc 3.9   UDR Inc 3.5     59.8  
Fidelity International Real Estate Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® International Real Estate Fund
Class Name Fidelity® International Real Estate Fund
Trading Symbol FIREX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2025 to January 31, 2026.
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® International Real Estate Fund 
$ 47 
0.88%
  
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.88%
Net Assets $ 360,223,460
Holdings Count | shares 80
Investment Company Portfolio Turnover 96.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$360,223,460
  
Number of Holdings
80
  
Portfolio Turnover
96%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 47.2   Industrial REITs 10.6   Residential REITs 10.4   Specialized REITs 8.3   Health Care REITs 6.9   Household Durables 4.6   Retail REITs 4.4   Diversified REITs 2.8   Health Care Providers & Services 2.7   Others 1.7       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.6                       Short-Term Investments and Net Other Assets (Liabilities) - 0.4   Japan 22.4 Australia 11.8 United Kingdom 11.5 Singapore 8.7 Hong Kong 8.5 Belgium 6.6 Sweden 5.0 France 4.2 Germany 3.6 Others 17.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 22.4                               Australia - 11.8                           United Kingdom - 11.5                      Singapore - 8.7                            Hong Kong - 8.5                            Belgium - 6.6                              Sweden - 5.0                               France - 4.2                               Germany - 3.6                              Others - 17.7                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Wing Tai Holdings Ltd 4.9   Sun Hung Kai Properties Ltd 3.8   Hulic Co Ltd 3.2   Advance Residence Investment Corp 3.0   Ingenia Communities Group unit 3.0   Warehouses De Pauw CVA 2.8   Health Care & Medical Investment Corp 2.7   Parkway Life Real Estate Investment Trust 2.6   Stockland unit 2.5   Prologis Inc 2.4     30.9  
Fidelity Advisor International Real Estate Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® International Real Estate Fund
Class Name Fidelity Advisor® International Real Estate Fund Class Z
Trading Symbol FIKLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2025 to January 31, 2026.
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 
$ 42 
0.79%
  
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.79%
Net Assets $ 360,223,460
Holdings Count | shares 80
Investment Company Portfolio Turnover 96.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$360,223,460
  
Number of Holdings
80
  
Portfolio Turnover
96%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 47.2   Industrial REITs 10.6   Residential REITs 10.4   Specialized REITs 8.3   Health Care REITs 6.9   Household Durables 4.6   Retail REITs 4.4   Diversified REITs 2.8   Health Care Providers & Services 2.7   Others 1.7       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.6                       Short-Term Investments and Net Other Assets (Liabilities) - 0.4   Japan 22.4 Australia 11.8 United Kingdom 11.5 Singapore 8.7 Hong Kong 8.5 Belgium 6.6 Sweden 5.0 France 4.2 Germany 3.6 Others 17.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 22.4                               Australia - 11.8                           United Kingdom - 11.5                      Singapore - 8.7                            Hong Kong - 8.5                            Belgium - 6.6                              Sweden - 5.0                               France - 4.2                               Germany - 3.6                              Others - 17.7                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Wing Tai Holdings Ltd 4.9   Sun Hung Kai Properties Ltd 3.8   Hulic Co Ltd 3.2   Advance Residence Investment Corp 3.0   Ingenia Communities Group unit 3.0   Warehouses De Pauw CVA 2.8   Health Care & Medical Investment Corp 2.7   Parkway Life Real Estate Investment Trust 2.6   Stockland unit 2.5   Prologis Inc 2.4     30.9  
Fidelity Advisor International Real Estate Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® International Real Estate Fund
Class Name Fidelity Advisor® International Real Estate Fund Class M
Trading Symbol FIRTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2025 to January 31, 2026.
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 
$ 76 
1.42%
  
Expenses Paid, Amount $ 76
Expense Ratio, Percent 1.42%
Net Assets $ 360,223,460
Holdings Count | shares 80
Investment Company Portfolio Turnover 96.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$360,223,460
  
Number of Holdings
80
  
Portfolio Turnover
96%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 47.2   Industrial REITs 10.6   Residential REITs 10.4   Specialized REITs 8.3   Health Care REITs 6.9   Household Durables 4.6   Retail REITs 4.4   Diversified REITs 2.8   Health Care Providers & Services 2.7   Others 1.7       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.6                       Short-Term Investments and Net Other Assets (Liabilities) - 0.4   Japan 22.4 Australia 11.8 United Kingdom 11.5 Singapore 8.7 Hong Kong 8.5 Belgium 6.6 Sweden 5.0 France 4.2 Germany 3.6 Others 17.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 22.4                               Australia - 11.8                           United Kingdom - 11.5                      Singapore - 8.7                            Hong Kong - 8.5                            Belgium - 6.6                              Sweden - 5.0                               France - 4.2                               Germany - 3.6                              Others - 17.7                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Wing Tai Holdings Ltd 4.9   Sun Hung Kai Properties Ltd 3.8   Hulic Co Ltd 3.2   Advance Residence Investment Corp 3.0   Ingenia Communities Group unit 3.0   Warehouses De Pauw CVA 2.8   Health Care & Medical Investment Corp 2.7   Parkway Life Real Estate Investment Trust 2.6   Stockland unit 2.5   Prologis Inc 2.4     30.9  
Fidelity Advisor International Real Estate Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® International Real Estate Fund
Class Name Fidelity Advisor® International Real Estate Fund Class I
Trading Symbol FIRIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2025 to January 31, 2026.
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 
$ 48 
0.91%
  
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.91%
Net Assets $ 360,223,460
Holdings Count | shares 80
Investment Company Portfolio Turnover 96.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$360,223,460
  
Number of Holdings
80
  
Portfolio Turnover
96%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 47.2   Industrial REITs 10.6   Residential REITs 10.4   Specialized REITs 8.3   Health Care REITs 6.9   Household Durables 4.6   Retail REITs 4.4   Diversified REITs 2.8   Health Care Providers & Services 2.7   Others 1.7       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.6                       Short-Term Investments and Net Other Assets (Liabilities) - 0.4   Japan 22.4 Australia 11.8 United Kingdom 11.5 Singapore 8.7 Hong Kong 8.5 Belgium 6.6 Sweden 5.0 France 4.2 Germany 3.6 Others 17.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 22.4                               Australia - 11.8                           United Kingdom - 11.5                      Singapore - 8.7                            Hong Kong - 8.5                            Belgium - 6.6                              Sweden - 5.0                               France - 4.2                               Germany - 3.6                              Others - 17.7                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Wing Tai Holdings Ltd 4.9   Sun Hung Kai Properties Ltd 3.8   Hulic Co Ltd 3.2   Advance Residence Investment Corp 3.0   Ingenia Communities Group unit 3.0   Warehouses De Pauw CVA 2.8   Health Care & Medical Investment Corp 2.7   Parkway Life Real Estate Investment Trust 2.6   Stockland unit 2.5   Prologis Inc 2.4     30.9  
Fidelity Advisor International Real Estate Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® International Real Estate Fund
Class Name Fidelity Advisor® International Real Estate Fund Class C
Trading Symbol FIRCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2025 to January 31, 2026.
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 
$ 103 
1.92%
  
Expenses Paid, Amount $ 103
Expense Ratio, Percent 1.92%
Net Assets $ 360,223,460
Holdings Count | shares 80
Investment Company Portfolio Turnover 96.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$360,223,460
  
Number of Holdings
80
  
Portfolio Turnover
96%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 47.2   Industrial REITs 10.6   Residential REITs 10.4   Specialized REITs 8.3   Health Care REITs 6.9   Household Durables 4.6   Retail REITs 4.4   Diversified REITs 2.8   Health Care Providers & Services 2.7   Others 1.7       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.6                       Short-Term Investments and Net Other Assets (Liabilities) - 0.4   Japan 22.4 Australia 11.8 United Kingdom 11.5 Singapore 8.7 Hong Kong 8.5 Belgium 6.6 Sweden 5.0 France 4.2 Germany 3.6 Others 17.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 22.4                               Australia - 11.8                           United Kingdom - 11.5                      Singapore - 8.7                            Hong Kong - 8.5                            Belgium - 6.6                              Sweden - 5.0                               France - 4.2                               Germany - 3.6                              Others - 17.7                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Wing Tai Holdings Ltd 4.9   Sun Hung Kai Properties Ltd 3.8   Hulic Co Ltd 3.2   Advance Residence Investment Corp 3.0   Ingenia Communities Group unit 3.0   Warehouses De Pauw CVA 2.8   Health Care & Medical Investment Corp 2.7   Parkway Life Real Estate Investment Trust 2.6   Stockland unit 2.5   Prologis Inc 2.4     30.9  
Fidelity Advisor International Real Estate Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® International Real Estate Fund
Class Name Fidelity Advisor® International Real Estate Fund Class A
Trading Symbol FIRAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2025 to January 31, 2026.
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 
$ 63 
1.17%
  
Expenses Paid, Amount $ 63
Expense Ratio, Percent 1.17%
Net Assets $ 360,223,460
Holdings Count | shares 80
Investment Company Portfolio Turnover 96.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$360,223,460
  
Number of Holdings
80
  
Portfolio Turnover
96%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 47.2   Industrial REITs 10.6   Residential REITs 10.4   Specialized REITs 8.3   Health Care REITs 6.9   Household Durables 4.6   Retail REITs 4.4   Diversified REITs 2.8   Health Care Providers & Services 2.7   Others 1.7       Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.6                       Short-Term Investments and Net Other Assets (Liabilities) - 0.4   Japan 22.4 Australia 11.8 United Kingdom 11.5 Singapore 8.7 Hong Kong 8.5 Belgium 6.6 Sweden 5.0 France 4.2 Germany 3.6 Others 17.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 22.4                               Australia - 11.8                           United Kingdom - 11.5                      Singapore - 8.7                            Hong Kong - 8.5                            Belgium - 6.6                              Sweden - 5.0                               France - 4.2                               Germany - 3.6                              Others - 17.7                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Wing Tai Holdings Ltd 4.9   Sun Hung Kai Properties Ltd 3.8   Hulic Co Ltd 3.2   Advance Residence Investment Corp 3.0   Ingenia Communities Group unit 3.0   Warehouses De Pauw CVA 2.8   Health Care & Medical Investment Corp 2.7   Parkway Life Real Estate Investment Trust 2.6   Stockland unit 2.5   Prologis Inc 2.4     30.9  
Fidelity Advisor Real Estate Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® Real Estate Investment Portfolio
Class Name Fidelity Advisor® Real Estate Fund Class A
Trading Symbol FRVBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Real Estate Investment Portfolio for the period January 15, 2026 to January 31, 2026.
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 A
$ 4 
0.92%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.92%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 3,050,854,347
Holdings Count | shares 42
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,050,854,347
  
Number of Holdings
42
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 33.5   Retail REITs 17.5   Industrial REITs 15.3   Health Care REITs 12.9   Residential REITs 11.7   Real Estate Management & Development 8.4       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 100.0                         
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Prologis Inc 10.0   Equinix Inc 8.9   Welltower Inc 8.6   American Tower Corp 8.2   NNN REIT Inc 4.4   Kimco Realty Corp 4.3   Public Storage 4.1   CBRE Group Inc Class A 3.9   Digital Realty Trust Inc 3.9   UDR Inc 3.5     59.8  
Fidelity Advisor Real Estate Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® Real Estate Investment Portfolio
Class Name Fidelity Advisor® Real Estate Fund Class M
Trading Symbol FRVDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Real Estate Investment Portfolio for the period January 15, 2026 to January 31, 2026.
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 A
$ 5 
1.05%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 5
Expense Ratio, Percent 1.05%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 3,050,854,347
Holdings Count | shares 42
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,050,854,347
  
Number of Holdings
42
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 33.5   Retail REITs 17.5   Industrial REITs 15.3   Health Care REITs 12.9   Residential REITs 11.7   Real Estate Management & Development 8.4       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 100.0                         
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Prologis Inc 10.0   Equinix Inc 8.9   Welltower Inc 8.6   American Tower Corp 8.2   NNN REIT Inc 4.4   Kimco Realty Corp 4.3   Public Storage 4.1   CBRE Group Inc Class A 3.9   Digital Realty Trust Inc 3.9   UDR Inc 3.5     59.8  
Fidelity Advisor Real Estate Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® Real Estate Investment Portfolio
Class Name Fidelity Advisor® Real Estate Fund Class C
Trading Symbol FRVEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Real Estate Investment Portfolio for the period January 15, 2026 to January 31, 2026.
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 A
$ 8 
1.66%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 8
Expense Ratio, Percent 1.66%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 3,050,854,347
Holdings Count | shares 42
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,050,854,347
  
Number of Holdings
42
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 33.5   Retail REITs 17.5   Industrial REITs 15.3   Health Care REITs 12.9   Residential REITs 11.7   Real Estate Management & Development 8.4       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 100.0                         
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Prologis Inc 10.0   Equinix Inc 8.9   Welltower Inc 8.6   American Tower Corp 8.2   NNN REIT Inc 4.4   Kimco Realty Corp 4.3   Public Storage 4.1   CBRE Group Inc Class A 3.9   Digital Realty Trust Inc 3.9   UDR Inc 3.5     59.8  
Fidelity Advisor Real Estate Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® Real Estate Investment Portfolio
Class Name Fidelity Advisor® Real Estate Fund Class I
Trading Symbol FRVHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Real Estate Investment Portfolio for the period January 15, 2026 to January 31, 2026.
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 A
$ 3 
0.66%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.66%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 3,050,854,347
Holdings Count | shares 42
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,050,854,347
  
Number of Holdings
42
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 33.5   Retail REITs 17.5   Industrial REITs 15.3   Health Care REITs 12.9   Residential REITs 11.7   Real Estate Management & Development 8.4       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 100.0                         
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Prologis Inc 10.0   Equinix Inc 8.9   Welltower Inc 8.6   American Tower Corp 8.2   NNN REIT Inc 4.4   Kimco Realty Corp 4.3   Public Storage 4.1   CBRE Group Inc Class A 3.9   Digital Realty Trust Inc 3.9   UDR Inc 3.5     59.8  
Fidelity Advisor Real Estate Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® Real Estate Investment Portfolio
Class Name Fidelity Advisor® Real Estate Fund Class Z
Trading Symbol FRVJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Real Estate Investment Portfolio for the period January 15, 2026 to January 31, 2026.
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 A
$ 3 
0.54%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.54%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 3,050,854,347
Holdings Count | shares 42
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of January 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,050,854,347
  
Number of Holdings
42
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 33.5   Retail REITs 17.5   Industrial REITs 15.3   Health Care REITs 12.9   Residential REITs 11.7   Real Estate Management & Development 8.4       Common Stocks 99.3 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 100.0                         
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Prologis Inc 10.0   Equinix Inc 8.9   Welltower Inc 8.6   American Tower Corp 8.2   NNN REIT Inc 4.4   Kimco Realty Corp 4.3   Public Storage 4.1   CBRE Group Inc Class A 3.9   Digital Realty Trust Inc 3.9   UDR Inc 3.5     59.8