v3.26.3
Shareholder Report
 6 Months Ended
Aug. 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 Aug. 31, 2026
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, 2026 to August 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
 
Wireless Portfolio 
$ 37 
0.68%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.68%
Net Assets $ 357,959,829
Holdings Count | shares 55
Investment Company Portfolio Turnover 50.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$357,959,829
  
Number of Holdings
55
  
Portfolio Turnover
50%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 24.1   Semiconductors & Semiconductor Equipment 20.3   Technology Hardware, Storage & Peripherals 17.7   Communications Equipment 13.9   Wireless Telecommunication Services 9.2   Specialized REITs 8.1   Software 3.9   Interactive Media & Services 0.9   Broadline Retail 0.5   Electronic Equipment, Instruments & Components 0.1       Common Stocks 98.5 Preferred Stocks 0.2 Short-Term Investments and Net Other Assets (Liabilities) 1.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.5                       Preferred Stocks - 0.2                     Short-Term Investments and Net Other Assets (Liabilities) - 1.3   United States 79.6 Canada 5.1 Finland 3.6 Singapore 3.0 United Kingdom 2.1 Sweden 1.8 Taiwan 1.5 Mexico 1.2 Puerto Rico 1.0 Others 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 79.6                       Canada - 5.1                               Finland - 3.6                              Singapore - 3.0                            United Kingdom - 2.1                       Sweden - 1.8                               Taiwan - 1.5                               Mexico - 1.2                               Puerto Rico - 1.0                          Others - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Apple Inc 17.5   Marvell Technology Inc 8.3   Verizon Communications Inc 7.3   QUALCOMM Inc 6.6   AT&T Inc 5.7   Motorola Solutions Inc 5.0   American Tower Corp 4.1   T-Mobile US Inc 3.9   Nokia Oyj ADR 3.6   STMicroelectronics NV depository receipt 3.0     65.0  
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, 2026 to August 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
 
Utilities Portfolio 
$ 29 
0.61%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.61%
Net Assets $ 3,502,084,320
Holdings Count | shares 38
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,502,084,320
  
Number of Holdings
38
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 67.5   Multi-Utilities 17.8   Independent Power and Renewable Electricity Producers 4.7   Commercial Services & Supplies 3.5   Water Utilities 2.6   Electrical Equipment 1.4   Construction & Engineering 0.7   Oil, Gas & Consumable Fuels 0.2       Common Stocks 98.4 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.4                       Short-Term Investments and Net Other Assets (Liabilities) - 1.6   United States 99.4 Germany 0.4 Canada 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.4                       Germany - 0.4                              Canada - 0.2                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NextEra Energy Inc 13.5   American Electric Power Co Inc 6.8   Constellation Energy Corp 6.5   Duke Energy Corp 5.8   Entergy Corp 5.2   Xcel Energy Inc 5.2   Sempra 4.9   Southern Co/The 4.4   Vistra Corp 4.0   Ameren Corp 4.0     60.3  
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, 2026 to August 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
 
Transportation Portfolio 
$ 34 
0.66%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.66%
Net Assets $ 511,739,632
Holdings Count | shares 38
Investment Company Portfolio Turnover 40.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$511,739,632
  
Number of Holdings
38
  
Portfolio Turnover
40%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Ground Transportation 51.4   Passenger Airlines 20.2   Air Freight & Logistics 17.8   Marine Transportation 1.8   Software 1.6   Machinery 1.5   Broadline Retail 1.2   Aerospace & Defense 0.7       Common Stocks 96.2 Short-Term Investments and Net Other Assets (Liabilities) 3.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 96.2                       Short-Term Investments and Net Other Assets (Liabilities) - 3.8   United States 95.8 Canada 2.2 Panama 1.1 Denmark 0.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.8                       Canada - 2.2                               Panama - 1.1                               Denmark - 0.9                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Uber Technologies Inc 11.8   Union Pacific Corp 11.2   Delta Air Lines Inc 7.8   United Airlines Holdings Inc 6.3   CSX Corp 6.1   Old Dominion Freight Line Inc 6.0   United Parcel Service Inc Class B 4.9   FedEx Corp 4.9   CH Robinson Worldwide Inc 4.7   XPO Inc 4.6     68.3  
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, 2026 to August 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
 
Telecommunications Portfolio 
$ 38 
0.72%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.72%
Net Assets $ 242,005,075
Holdings Count | shares 33
Investment Company Portfolio Turnover 89.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$242,005,075
  
Number of Holdings
33
  
Portfolio Turnover
89%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 88.1   Wireless Telecommunication Services 8.9   Interactive Media & Services 0.8   Software 0.6   Communications Equipment 0.3   Electronic Equipment, Instruments & Components 0.2       Common Stocks 98.0 Preferred Stocks 0.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.0                       Preferred Stocks - 0.9                     Short-Term Investments and Net Other Assets (Liabilities) - 1.1   United States 93.4 Puerto Rico 4.4 Belgium 2.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.4                       Puerto Rico - 4.4                          Belgium - 2.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Verizon Communications Inc 22.4   AT&T Inc 22.0   Space Exploration Technologies Corp Class A 5.6   Globalstar Inc 4.9   Iridium Communications Inc 4.7   AST SpaceMobile Inc Class A 4.3   T-Mobile US Inc 4.2   IDT Corp Class B 3.3   Lumen Technologies Inc 3.1   Uniti Group Inc 3.0     77.5  
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, 2026 to August 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 
$ 33 
0.62%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.62%
Net Assets $ 242,005,075
Holdings Count | shares 33
Investment Company Portfolio Turnover 89.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$242,005,075
  
Number of Holdings
33
  
Portfolio Turnover
89%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 88.1   Wireless Telecommunication Services 8.9   Interactive Media & Services 0.8   Software 0.6   Communications Equipment 0.3   Electronic Equipment, Instruments & Components 0.2       Common Stocks 98.0 Preferred Stocks 0.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.0                       Preferred Stocks - 0.9                     Short-Term Investments and Net Other Assets (Liabilities) - 1.1   United States 93.4 Puerto Rico 4.4 Belgium 2.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.4                       Puerto Rico - 4.4                          Belgium - 2.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Verizon Communications Inc 22.4   AT&T Inc 22.0   Space Exploration Technologies Corp Class A 5.6   Globalstar Inc 4.9   Iridium Communications Inc 4.7   AST SpaceMobile Inc Class A 4.3   T-Mobile US Inc 4.2   IDT Corp Class B 3.3   Lumen Technologies Inc 3.1   Uniti Group Inc 3.0     77.5  
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, 2026 to August 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 
$ 66 
1.26%
  
Expenses Paid, Amount $ 66
Expense Ratio, Percent 1.26%
Net Assets $ 242,005,075
Holdings Count | shares 33
Investment Company Portfolio Turnover 89.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$242,005,075
  
Number of Holdings
33
  
Portfolio Turnover
89%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 88.1   Wireless Telecommunication Services 8.9   Interactive Media & Services 0.8   Software 0.6   Communications Equipment 0.3   Electronic Equipment, Instruments & Components 0.2       Common Stocks 98.0 Preferred Stocks 0.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.0                       Preferred Stocks - 0.9                     Short-Term Investments and Net Other Assets (Liabilities) - 1.1   United States 93.4 Puerto Rico 4.4 Belgium 2.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.4                       Puerto Rico - 4.4                          Belgium - 2.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Verizon Communications Inc 22.4   AT&T Inc 22.0   Space Exploration Technologies Corp Class A 5.6   Globalstar Inc 4.9   Iridium Communications Inc 4.7   AST SpaceMobile Inc Class A 4.3   T-Mobile US Inc 4.2   IDT Corp Class B 3.3   Lumen Technologies Inc 3.1   Uniti Group Inc 3.0     77.5  
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, 2026 to August 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 
$ 38 
0.73%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.73%
Net Assets $ 242,005,075
Holdings Count | shares 33
Investment Company Portfolio Turnover 89.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$242,005,075
  
Number of Holdings
33
  
Portfolio Turnover
89%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 88.1   Wireless Telecommunication Services 8.9   Interactive Media & Services 0.8   Software 0.6   Communications Equipment 0.3   Electronic Equipment, Instruments & Components 0.2       Common Stocks 98.0 Preferred Stocks 0.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.0                       Preferred Stocks - 0.9                     Short-Term Investments and Net Other Assets (Liabilities) - 1.1   United States 93.4 Puerto Rico 4.4 Belgium 2.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.4                       Puerto Rico - 4.4                          Belgium - 2.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Verizon Communications Inc 22.4   AT&T Inc 22.0   Space Exploration Technologies Corp Class A 5.6   Globalstar Inc 4.9   Iridium Communications Inc 4.7   AST SpaceMobile Inc Class A 4.3   T-Mobile US Inc 4.2   IDT Corp Class B 3.3   Lumen Technologies Inc 3.1   Uniti Group Inc 3.0     77.5  
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, 2026 to August 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 
$ 92 
1.75%
  
Expenses Paid, Amount $ 92
Expense Ratio, Percent 1.75%
Net Assets $ 242,005,075
Holdings Count | shares 33
Investment Company Portfolio Turnover 89.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$242,005,075
  
Number of Holdings
33
  
Portfolio Turnover
89%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 88.1   Wireless Telecommunication Services 8.9   Interactive Media & Services 0.8   Software 0.6   Communications Equipment 0.3   Electronic Equipment, Instruments & Components 0.2       Common Stocks 98.0 Preferred Stocks 0.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.0                       Preferred Stocks - 0.9                     Short-Term Investments and Net Other Assets (Liabilities) - 1.1   United States 93.4 Puerto Rico 4.4 Belgium 2.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.4                       Puerto Rico - 4.4                          Belgium - 2.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Verizon Communications Inc 22.4   AT&T Inc 22.0   Space Exploration Technologies Corp Class A 5.6   Globalstar Inc 4.9   Iridium Communications Inc 4.7   AST SpaceMobile Inc Class A 4.3   T-Mobile US Inc 4.2   IDT Corp Class B 3.3   Lumen Technologies Inc 3.1   Uniti Group Inc 3.0     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, 2026 to August 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 
$ 53 
1.01%
  
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.01%
Net Assets $ 242,005,075
Holdings Count | shares 33
Investment Company Portfolio Turnover 89.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$242,005,075
  
Number of Holdings
33
  
Portfolio Turnover
89%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Diversified Telecommunication Services 88.1   Wireless Telecommunication Services 8.9   Interactive Media & Services 0.8   Software 0.6   Communications Equipment 0.3   Electronic Equipment, Instruments & Components 0.2       Common Stocks 98.0 Preferred Stocks 0.9 Short-Term Investments and Net Other Assets (Liabilities) 1.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.0                       Preferred Stocks - 0.9                     Short-Term Investments and Net Other Assets (Liabilities) - 1.1   United States 93.4 Puerto Rico 4.4 Belgium 2.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.4                       Puerto Rico - 4.4                          Belgium - 2.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Verizon Communications Inc 22.4   AT&T Inc 22.0   Space Exploration Technologies Corp Class A 5.6   Globalstar Inc 4.9   Iridium Communications Inc 4.7   AST SpaceMobile Inc Class A 4.3   T-Mobile US Inc 4.2   IDT Corp Class B 3.3   Lumen Technologies Inc 3.1   Uniti Group Inc 3.0     77.5  
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, 2026 to August 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
 
Technology Portfolio 
$ 35 
0.58%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.58%
Net Assets $ 36,944,355,957
Holdings Count | shares 126
Investment Company Portfolio Turnover 95.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$36,944,355,957
  
Number of Holdings
126
  
Portfolio Turnover
95%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 43.2   Technology Hardware, Storage & Peripherals 20.5   Software 18.7   IT Services 5.7   Communications Equipment 4.8   Electronic Equipment, Instruments & Components 2.7   Broadline Retail 2.6   Interactive Media & Services 0.9   Financial Services 0.2   Others 0.5       Common Stocks 95.1 Preferred Stocks 4.7 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.1                       Preferred Stocks - 4.7                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 93.6 Taiwan 2.7 Netherlands 2.2 Canada 1.1 United Kingdom 0.2 China 0.1 Israel 0.1 Estonia 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       Taiwan - 2.7                               Netherlands - 2.2                          Canada - 1.1                               United Kingdom - 0.2                       China - 0.1                                Israel - 0.1                               Estonia - 0.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 18.8   Apple Inc 15.7   Microsoft Corp 8.4   Micron Technology Inc 3.5   Cisco Systems Inc 3.4   Marvell Technology Inc 2.8   Amazon.com Inc 2.6   Intel Corp 2.3   Western Digital Corp 2.3   Advanced Micro Devices Inc 1.9     61.7  
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, 2026 to August 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
 
Tech Hardware Portfolio 
$ 38 
0.62%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.62%
Net Assets $ 3,923,752,533
Holdings Count | shares 43
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,923,752,533
  
Number of Holdings
43
  
Portfolio Turnover
35%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Technology Hardware, Storage & Peripherals 40.6   Communications Equipment 27.0   Semiconductors & Semiconductor Equipment 11.5   Household Durables 7.3   Electronic Equipment, Instruments & Components 6.2   Entertainment 3.2   Broadline Retail 2.0   Software 0.8   Interactive Media & Services 0.6   Health Care Equipment & Supplies 0.3       Common Stocks 99.4 Preferred Stocks 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.5 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.4                       Preferred Stocks - 0.1                     Short-Term Investments and Net Other Assets (Liabilities) - 0.5   United States 67.8 Japan 15.1 Korea (South) 9.4 Taiwan 4.0 Finland 2.2 China 0.9 Israel 0.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 67.8                       Japan - 15.1                               Korea (South) - 9.4                        Taiwan - 4.0                               Finland - 2.2                              China - 0.9                                Israel - 0.6                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Apple Inc 11.6   Cisco Systems Inc 11.3   Samsung Electronics Co Ltd 7.9   Western Digital Corp 6.3   Arista Networks Inc 6.2   Kioxia Holdings Corp 5.8   Dell Technologies Inc Class C 4.8   Sandisk Corp 4.7   Motorola Solutions Inc 4.7   Seagate Technology Holdings PLC 3.5     66.8  
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, 2026 to August 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
 
Software and IT Services Portfolio 
$ 36 
0.59%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.59%
Net Assets $ 7,854,597,492
Holdings Count | shares 57
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$7,854,597,492
  
Number of Holdings
57
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Software 73.3   IT Services 21.5   Broadline Retail 2.8   Media 1.1   Interactive Media & Services 1.0       Common Stocks 98.8 Preferred Stocks 0.9 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.8                       Preferred Stocks - 0.9                     Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 98.4 Canada 1.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 98.4                       Canada - 1.6                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Microsoft Corp 24.9   Salesforce Inc 5.4   Palo Alto Networks Inc 5.2   Palantir Technologies Inc Class A 4.9   Datadog Inc Class A 3.9   Snowflake Inc 3.8   Crowdstrike Holdings Inc Class A 3.6   Twilio Inc Class A 3.2   Okta Inc Class A 3.2   Synopsys Inc 3.0     61.1  
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, 2026 to August 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
 
Semiconductors Portfolio 
$ 34 
0.57%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.57%
Net Assets $ 44,842,010,849
Holdings Count | shares 82
Investment Company Portfolio Turnover 79.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$44,842,010,849
  
Number of Holdings
82
  
Portfolio Turnover
79%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 93.4   Technology Hardware, Storage & Peripherals 3.6   Electronic Equipment, Instruments & Components 1.1   Software 0.5   Electrical Equipment 0.4   Financial Services 0.0   Metals & Mining 0.0       Common Stocks 97.7 Preferred Stocks 1.3 Preferred Securities 0.0 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 97.7                       Preferred Stocks - 1.3                     Preferred Securities - 0.0                 Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 87.2 Netherlands 8.2 Japan 2.1 Israel 1.6 Taiwan 0.8 Korea (South) 0.1 Canada 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.2                       Netherlands - 8.2                          Japan - 2.1                                Israel - 1.6                               Taiwan - 0.8                               Korea (South) - 0.1                        Canada - 0.0                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 24.9   Broadcom Inc 14.9   Marvell Technology Inc 7.1   ASML Holding NV depository receipt 4.8   Astera Labs Inc 4.7   Monolithic Power Systems Inc 4.6   Micron Technology Inc 4.3   ON Semiconductor Corp 3.6   Lam Research Corp 3.5   NXP Semiconductors NV 3.2     75.6  
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, 2026 to August 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
 
Retailing Portfolio 
$ 31 
0.61%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61%
Net Assets $ 2,182,705,085
Holdings Count | shares 53
Investment Company Portfolio Turnover 38.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,182,705,085
  
Number of Holdings
53
  
Portfolio Turnover
38%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialty Retail 31.8   Broadline Retail 31.4   Consumer Staples Distribution & Retail 28.5   Textiles, Apparel & Luxury Goods 7.0   Household Durables 0.4       Common Stocks 99.1 Short-Term Investments and Net Other Assets (Liabilities) 0.9 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.1                       Short-Term Investments and Net Other Assets (Liabilities) - 0.9   United States 94.8 Brazil 2.8 Canada 0.8 Germany 0.7 Finland 0.6 France 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 94.8                       Brazil - 2.8                               Canada - 0.8                               Germany - 0.7                              Finland - 0.6                              France - 0.3                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Amazon.com Inc 24.8   Walmart Inc 9.1   Costco Wholesale Corp 7.0   Lowe's Cos Inc 6.1   Target Corp 3.7   Ross Stores Inc 3.3   O'Reilly Automotive Inc 3.0   Dollar Tree Inc 3.0   MercadoLibre Inc 2.8   TJX Cos Inc/The 2.6     65.4  
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, 2026 to August 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
 
Pharmaceuticals Portfolio 
$ 34 
0.64%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.64%
Net Assets $ 1,632,869,546
Holdings Count | shares 59
Investment Company Portfolio Turnover 58.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,632,869,546
  
Number of Holdings
59
  
Portfolio Turnover
58%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Pharmaceuticals 79.8   Biotechnology 18.9   Software 0.1   Financial Services 0.0   Consumer Staples Distribution & Retail 0.0       Common Stocks 98.4 Preferred Stocks 0.4 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.4                       Preferred Stocks - 0.4                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 1.2   United States 78.5 United Kingdom 12.9 Belgium 5.1 Germany 1.7 Canada 0.8 Sweden 0.5 Denmark 0.3 Netherlands 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 78.5                       United Kingdom - 12.9                      Belgium - 5.1                              Germany - 1.7                              Canada - 0.8                               Sweden - 0.5                               Denmark - 0.3                              Netherlands - 0.2                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Eli Lilly & Co 24.5   GSK PLC ADR 7.9   Merck & Co Inc 6.4   Viatris Inc 5.5   Astrazeneca PLC (United States) 5.0   UCB SA 4.8   Bristol-Myers Squibb Co 4.6   Roche Holding AG 4.6   Gilead Sciences Inc 4.6   Elanco Animal Health Inc 4.3     72.2  
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, 2026 to August 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
 
Medical Technology and Devices Portfolio 
$ 32 
0.60%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.60%
Net Assets $ 3,343,495,786
Holdings Count | shares 59
Investment Company Portfolio Turnover 73.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,343,495,786
  
Number of Holdings
59
  
Portfolio Turnover
73%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Life Sciences Tools & Services 63.6   Health Care Equipment & Supplies 23.9   Biotechnology 6.0   Health Care Providers & Services 3.5   Health Care Technology 2.6   Chemicals 0.1   Pharmaceuticals 0.1       Common Stocks 97.6 Preferred Stocks 2.2 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 97.6                       Preferred Stocks - 2.2                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 97.6 France 2.3 China 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 97.6                       France - 2.3                               China - 0.1                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Thermo Fisher Scientific Inc 17.6   Danaher Corp 14.0   Intuitive Surgical Inc 5.3   Waters Corp 4.3   West Pharmaceutical Services Inc 4.1   Agilent Technologies Inc 3.9   10X Genomics Inc Class A 3.8   Boston Scientific Corp 3.6   Abbott Laboratories 3.4   Stryker Corp 3.2     63.2  
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, 2026 to August 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
 
Materials Portfolio 
$ 34 
0.67%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.67%
Net Assets $ 790,654,834
Holdings Count | shares 52
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$790,654,834
  
Number of Holdings
52
  
Portfolio Turnover
54%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Chemicals 47.1   Metals & Mining 37.0   Construction Materials 9.1   Containers & Packaging 6.4       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   United States 89.1 Canada 9.0 Brazil 1.2 Zambia 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 89.1                       Canada - 9.0                               Brazil - 1.2                               Zambia - 0.7                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Linde PLC 15.8   Freeport-McMoRan Inc 8.1   Newmont Corp 8.0   Ecolab Inc 6.2   Corteva Inc 4.6   Nucor Corp 4.5   Air Products and Chemicals Inc 4.0   Albemarle Corp 3.7   Altius Minerals Corp 3.4   Sherwin-Williams Co/The 3.3     61.6  
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, 2026 to August 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 
$ 29 
0.58%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.58%
Net Assets $ 790,654,834
Holdings Count | shares 52
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$790,654,834
  
Number of Holdings
52
  
Portfolio Turnover
54%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Chemicals 47.1   Metals & Mining 37.0   Construction Materials 9.1   Containers & Packaging 6.4       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   United States 89.1 Canada 9.0 Brazil 1.2 Zambia 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 89.1                       Canada - 9.0                               Brazil - 1.2                               Zambia - 0.7                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Linde PLC 15.8   Freeport-McMoRan Inc 8.1   Newmont Corp 8.0   Ecolab Inc 6.2   Corteva Inc 4.6   Nucor Corp 4.5   Air Products and Chemicals Inc 4.0   Albemarle Corp 3.7   Altius Minerals Corp 3.4   Sherwin-Williams Co/The 3.3     61.6  
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, 2026 to August 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 
$ 61 
1.21%
  
Expenses Paid, Amount $ 61
Expense Ratio, Percent 1.21%
Net Assets $ 790,654,834
Holdings Count | shares 52
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$790,654,834
  
Number of Holdings
52
  
Portfolio Turnover
54%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Chemicals 47.1   Metals & Mining 37.0   Construction Materials 9.1   Containers & Packaging 6.4       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   United States 89.1 Canada 9.0 Brazil 1.2 Zambia 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 89.1                       Canada - 9.0                               Brazil - 1.2                               Zambia - 0.7                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Linde PLC 15.8   Freeport-McMoRan Inc 8.1   Newmont Corp 8.0   Ecolab Inc 6.2   Corteva Inc 4.6   Nucor Corp 4.5   Air Products and Chemicals Inc 4.0   Albemarle Corp 3.7   Altius Minerals Corp 3.4   Sherwin-Williams Co/The 3.3     61.6  
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, 2026 to August 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 
$ 36 
0.72%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.72%
Net Assets $ 790,654,834
Holdings Count | shares 52
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$790,654,834
  
Number of Holdings
52
  
Portfolio Turnover
54%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Chemicals 47.1   Metals & Mining 37.0   Construction Materials 9.1   Containers & Packaging 6.4       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   United States 89.1 Canada 9.0 Brazil 1.2 Zambia 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 89.1                       Canada - 9.0                               Brazil - 1.2                               Zambia - 0.7                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Linde PLC 15.8   Freeport-McMoRan Inc 8.1   Newmont Corp 8.0   Ecolab Inc 6.2   Corteva Inc 4.6   Nucor Corp 4.5   Air Products and Chemicals Inc 4.0   Albemarle Corp 3.7   Altius Minerals Corp 3.4   Sherwin-Williams Co/The 3.3     61.6  
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, 2026 to August 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 
$ 86 
1.71%
  
Expenses Paid, Amount $ 86
Expense Ratio, Percent 1.71%
Net Assets $ 790,654,834
Holdings Count | shares 52
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$790,654,834
  
Number of Holdings
52
  
Portfolio Turnover
54%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Chemicals 47.1   Metals & Mining 37.0   Construction Materials 9.1   Containers & Packaging 6.4       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   United States 89.1 Canada 9.0 Brazil 1.2 Zambia 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 89.1                       Canada - 9.0                               Brazil - 1.2                               Zambia - 0.7                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Linde PLC 15.8   Freeport-McMoRan Inc 8.1   Newmont Corp 8.0   Ecolab Inc 6.2   Corteva Inc 4.6   Nucor Corp 4.5   Air Products and Chemicals Inc 4.0   Albemarle Corp 3.7   Altius Minerals Corp 3.4   Sherwin-Williams Co/The 3.3     61.6  
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, 2026 to August 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 
$ 49 
0.97%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.97%
Net Assets $ 790,654,834
Holdings Count | shares 52
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$790,654,834
  
Number of Holdings
52
  
Portfolio Turnover
54%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Chemicals 47.1   Metals & Mining 37.0   Construction Materials 9.1   Containers & Packaging 6.4       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   United States 89.1 Canada 9.0 Brazil 1.2 Zambia 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 89.1                       Canada - 9.0                               Brazil - 1.2                               Zambia - 0.7                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Linde PLC 15.8   Freeport-McMoRan Inc 8.1   Newmont Corp 8.0   Ecolab Inc 6.2   Corteva Inc 4.6   Nucor Corp 4.5   Air Products and Chemicals Inc 4.0   Albemarle Corp 3.7   Altius Minerals Corp 3.4   Sherwin-Williams Co/The 3.3     61.6  
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, 2026 to August 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
 
Leisure Portfolio 
$ 34 
0.66%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.66%
Net Assets $ 481,253,125
Holdings Count | shares 28
Investment Company Portfolio Turnover 106.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$481,253,125
  
Number of Holdings
28
  
Portfolio Turnover
106%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Hotels, Restaurants & Leisure 91.8   Consumer Staples Distribution & Retail 6.3   Passenger Airlines 0.4   Entertainment 0.0       Common Stocks 98.5 Short-Term Investments and Net Other Assets (Liabilities) 1.5 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.5                       Short-Term Investments and Net Other Assets (Liabilities) - 1.5   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)     McDonald's Corp 10.7   Booking Holdings Inc 9.1   Hilton Worldwide Holdings Inc 8.4   Expedia Group Inc Class A 8.2   Starbucks Corp 7.1   Marriott International Inc/MD Class A1 6.6   DoorDash Inc Class A 4.9   Carnival Corp Ltd 4.8   Airbnb Inc Class A 4.8   US Foods Holding Corp 4.8     69.4  
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, 2026 to August 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
 
Insurance Portfolio 
$ 35 
0.66%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.66%
Net Assets $ 624,480,494
Holdings Count | shares 25
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$624,480,494
  
Number of Holdings
25
  
Portfolio Turnover
8%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Insurance 95.9   Financial Services 3.5       Common Stocks 99.4 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.4                       Short-Term Investments and Net Other Assets (Liabilities) - 0.6   United States 98.3 United Kingdom 1.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 98.3                       United Kingdom - 1.7                          
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Chubb Ltd 13.0   Progressive Corp/The 9.2   Arthur J Gallagher & Co 8.7   Reinsurance Group of America Inc 6.4   Hartford Insurance Group Inc/The 6.1   Marsh & McLennan Cos Inc 5.0   Travelers Companies Inc/The 4.9   MetLife Inc 4.8   Willis Towers Watson PLC 4.8   Arch Capital Group Ltd 4.5     67.4  
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, 2026 to August 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
 
Health Care Services Portfolio 
$ 35 
0.66%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.66%
Net Assets $ 851,301,734
Holdings Count | shares 42
Investment Company Portfolio Turnover 143.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$851,301,734
  
Number of Holdings
42
  
Portfolio Turnover
143%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Health Care Providers & Services 96.9   Health Care Technology 0.7   Health Care Equipment & Supplies 0.0       Common Stocks 96.8 Preferred Stocks 0.8 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 96.8                       Preferred Stocks - 0.8                     Short-Term Investments and Net Other Assets (Liabilities) - 2.4   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)     UnitedHealth Group Inc 24.3   CVS Health Corp 10.9   McKesson Corp 9.5   Cencora Inc 5.1   Elevance Health Inc 4.9   Labcorp Holdings Inc 4.4   Tenet Healthcare Corp 4.3   BrightSpring Health Services Inc 3.6   Encompass Health Corp 3.6   Alignment Healthcare Inc 3.1     73.7  
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, 2026 to August 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
 
Health Care Portfolio 
$ 33 
0.60%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.60%
Net Assets $ 6,749,144,400
Holdings Count | shares 141
Investment Company Portfolio Turnover 89.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,749,144,400
  
Number of Holdings
141
  
Portfolio Turnover
89%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Biotechnology 38.4   Life Sciences Tools & Services 26.1   Pharmaceuticals 23.4   Health Care Providers & Services 7.9   Health Care Equipment & Supplies 2.9   Health Care Technology 0.9   Chemicals 0.0       Common Stocks 98.1 Preferred Stocks 1.5 Bonds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.1                       Preferred Stocks - 1.5                     Bonds - 0.1                                Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 91.3 Belgium 3.5 Denmark 1.9 France 1.0 Netherlands 0.8 Canada 0.8 United Kingdom 0.5 Israel 0.1 Australia 0.1 China 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 91.3                       Belgium - 3.5                              Denmark - 1.9                              France - 1.0                               Netherlands - 0.8                          Canada - 0.8                               United Kingdom - 0.5                       Israel - 0.1                               Australia - 0.1                            China - 0.0                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Eli Lilly & Co 7.2   Thermo Fisher Scientific Inc 6.7   Danaher Corp 6.6   UnitedHealth Group Inc 3.2   Johnson & Johnson 3.1   Natera Inc 2.9   AbbVie Inc 2.9   Merck & Co Inc 2.6   West Pharmaceutical Services Inc 2.6   Argenx SE ADR 2.3     40.1  
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, 2026 to August 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
 
Gold Portfolio 
$ 30 
0.62%
  
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.62%
Net Assets $ 4,440,523,673
Holdings Count | shares 40
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,440,523,673
  
Number of Holdings
40
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 94.8     *Includes gold bullion and/or silver bullion.   Common Stocks 94.8 Other Investments 0.0 Short-Term Investments and Net Other Assets (Liabilities) 5.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.8                       Other Investments - 0.0                    Short-Term Investments and Net Other Assets (Liabilities) - 5.2   Canada 51.7 United States 19.5 Brazil 9.2 Australia 4.5 Turkey 4.3 Burkina Faso 3.4 Morocco 2.3 Zambia 1.7 Hong Kong 1.5 Others 1.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Canada - 51.7                              United States - 19.5                       Brazil - 9.2                               Australia - 4.5                            Turkey - 4.3                               Burkina Faso - 3.4                         Morocco - 2.3                              Zambia - 1.7                               Hong Kong - 1.5                            Others - 1.9                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Newmont Corp 11.0   Agnico Eagle Mines Ltd/CA 10.0   Wheaton Precious Metals Corp 9.2   Barrick Mining Corp 8.4   Franco-Nevada Corp 6.9   Eldorado Gold Corp 4.3   DPM Metals Inc 3.8   G Mining Ventures Corp 3.5   IAMGOLD Corp 3.4   Coeur Mining Inc 3.3     63.8  
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, 2026 to August 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 
$ 27 
0.56%
  
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.56%
Net Assets $ 4,440,523,673
Holdings Count | shares 40
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,440,523,673
  
Number of Holdings
40
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 94.8     *Includes gold bullion and/or silver bullion.   Common Stocks 94.8 Other Investments 0.0 Short-Term Investments and Net Other Assets (Liabilities) 5.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.8                       Other Investments - 0.0                    Short-Term Investments and Net Other Assets (Liabilities) - 5.2   Canada 51.7 United States 19.5 Brazil 9.2 Australia 4.5 Turkey 4.3 Burkina Faso 3.4 Morocco 2.3 Zambia 1.7 Hong Kong 1.5 Others 1.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Canada - 51.7                              United States - 19.5                       Brazil - 9.2                               Australia - 4.5                            Turkey - 4.3                               Burkina Faso - 3.4                         Morocco - 2.3                              Zambia - 1.7                               Hong Kong - 1.5                            Others - 1.9                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Newmont Corp 11.0   Agnico Eagle Mines Ltd/CA 10.0   Wheaton Precious Metals Corp 9.2   Barrick Mining Corp 8.4   Franco-Nevada Corp 6.9   Eldorado Gold Corp 4.3   DPM Metals Inc 3.8   G Mining Ventures Corp 3.5   IAMGOLD Corp 3.4   Coeur Mining Inc 3.3     63.8  
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, 2026 to August 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 
$ 55 
1.17%
  
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.17%
Net Assets $ 4,440,523,673
Holdings Count | shares 40
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,440,523,673
  
Number of Holdings
40
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 94.8     *Includes gold bullion and/or silver bullion.   Common Stocks 94.8 Other Investments 0.0 Short-Term Investments and Net Other Assets (Liabilities) 5.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.8                       Other Investments - 0.0                    Short-Term Investments and Net Other Assets (Liabilities) - 5.2   Canada 51.7 United States 19.5 Brazil 9.2 Australia 4.5 Turkey 4.3 Burkina Faso 3.4 Morocco 2.3 Zambia 1.7 Hong Kong 1.5 Others 1.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Canada - 51.7                              United States - 19.5                       Brazil - 9.2                               Australia - 4.5                            Turkey - 4.3                               Burkina Faso - 3.4                         Morocco - 2.3                              Zambia - 1.7                               Hong Kong - 1.5                            Others - 1.9                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Newmont Corp 11.0   Agnico Eagle Mines Ltd/CA 10.0   Wheaton Precious Metals Corp 9.2   Barrick Mining Corp 8.4   Franco-Nevada Corp 6.9   Eldorado Gold Corp 4.3   DPM Metals Inc 3.8   G Mining Ventures Corp 3.5   IAMGOLD Corp 3.4   Coeur Mining Inc 3.3     63.8  
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, 2026 to August 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 
$ 32 
0.67%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.67%
Net Assets $ 4,440,523,673
Holdings Count | shares 40
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,440,523,673
  
Number of Holdings
40
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 94.8     *Includes gold bullion and/or silver bullion.   Common Stocks 94.8 Other Investments 0.0 Short-Term Investments and Net Other Assets (Liabilities) 5.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.8                       Other Investments - 0.0                    Short-Term Investments and Net Other Assets (Liabilities) - 5.2   Canada 51.7 United States 19.5 Brazil 9.2 Australia 4.5 Turkey 4.3 Burkina Faso 3.4 Morocco 2.3 Zambia 1.7 Hong Kong 1.5 Others 1.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Canada - 51.7                              United States - 19.5                       Brazil - 9.2                               Australia - 4.5                            Turkey - 4.3                               Burkina Faso - 3.4                         Morocco - 2.3                              Zambia - 1.7                               Hong Kong - 1.5                            Others - 1.9                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Newmont Corp 11.0   Agnico Eagle Mines Ltd/CA 10.0   Wheaton Precious Metals Corp 9.2   Barrick Mining Corp 8.4   Franco-Nevada Corp 6.9   Eldorado Gold Corp 4.3   DPM Metals Inc 3.8   G Mining Ventures Corp 3.5   IAMGOLD Corp 3.4   Coeur Mining Inc 3.3     63.8  
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, 2026 to August 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 
$ 79 
1.66%
  
Expenses Paid, Amount $ 79
Expense Ratio, Percent 1.66%
Net Assets $ 4,440,523,673
Holdings Count | shares 40
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,440,523,673
  
Number of Holdings
40
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 94.8     *Includes gold bullion and/or silver bullion.   Common Stocks 94.8 Other Investments 0.0 Short-Term Investments and Net Other Assets (Liabilities) 5.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.8                       Other Investments - 0.0                    Short-Term Investments and Net Other Assets (Liabilities) - 5.2   Canada 51.7 United States 19.5 Brazil 9.2 Australia 4.5 Turkey 4.3 Burkina Faso 3.4 Morocco 2.3 Zambia 1.7 Hong Kong 1.5 Others 1.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Canada - 51.7                              United States - 19.5                       Brazil - 9.2                               Australia - 4.5                            Turkey - 4.3                               Burkina Faso - 3.4                         Morocco - 2.3                              Zambia - 1.7                               Hong Kong - 1.5                            Others - 1.9                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Newmont Corp 11.0   Agnico Eagle Mines Ltd/CA 10.0   Wheaton Precious Metals Corp 9.2   Barrick Mining Corp 8.4   Franco-Nevada Corp 6.9   Eldorado Gold Corp 4.3   DPM Metals Inc 3.8   G Mining Ventures Corp 3.5   IAMGOLD Corp 3.4   Coeur Mining Inc 3.3     63.8  
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, 2026 to August 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 
$ 44 
0.92%
  
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.92%
Net Assets $ 4,440,523,673
Holdings Count | shares 40
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,440,523,673
  
Number of Holdings
40
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Metals & Mining* 94.8     *Includes gold bullion and/or silver bullion.   Common Stocks 94.8 Other Investments 0.0 Short-Term Investments and Net Other Assets (Liabilities) 5.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.8                       Other Investments - 0.0                    Short-Term Investments and Net Other Assets (Liabilities) - 5.2   Canada 51.7 United States 19.5 Brazil 9.2 Australia 4.5 Turkey 4.3 Burkina Faso 3.4 Morocco 2.3 Zambia 1.7 Hong Kong 1.5 Others 1.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Canada - 51.7                              United States - 19.5                       Brazil - 9.2                               Australia - 4.5                            Turkey - 4.3                               Burkina Faso - 3.4                         Morocco - 2.3                              Zambia - 1.7                               Hong Kong - 1.5                            Others - 1.9                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Newmont Corp 11.0   Agnico Eagle Mines Ltd/CA 10.0   Wheaton Precious Metals Corp 9.2   Barrick Mining Corp 8.4   Franco-Nevada Corp 6.9   Eldorado Gold Corp 4.3   DPM Metals Inc 3.8   G Mining Ventures Corp 3.5   IAMGOLD Corp 3.4   Coeur Mining Inc 3.3     63.8  
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, 2026 to August 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
 
Financials Portfolio 
$ 36 
0.66%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.66%
Net Assets $ 1,561,693,325
Holdings Count | shares 65
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,561,693,325
  
Number of Holdings
65
  
Portfolio Turnover
27%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Banks 33.8   Capital Markets 28.1   Insurance 18.1   Financial Services 14.2   Consumer Finance 4.5   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)     Common Stocks - 99.7                       Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 95.6 United Kingdom 1.1 Australia 0.8 Grand Cayman (UK Overseas Ter) 0.7 Puerto Rico 0.7 Mexico 0.6 France 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.6                       United Kingdom - 1.1                       Australia - 0.8                            Grand Cayman (UK Overseas Ter) - 0.7       Puerto Rico - 0.7                          Mexico - 0.6                               France - 0.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Mastercard Inc Class A 8.4   Bank of America Corp 7.5   Wells Fargo & Co 7.0   Charles Schwab Corp/The 4.6   Reinsurance Group of America Inc 4.0   Citigroup Inc 4.0   State Street Corp 3.8   Morgan Stanley 2.5   KKR & Co Inc Class A 2.4   Capital One Financial Corp 2.4     46.6  
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, 2026 to August 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
 
FinTech Portfolio 
$ 40 
0.74%
  
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.74%
Net Assets $ 92,305,938
Holdings Count | shares 34
Investment Company Portfolio Turnover 514.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$92,305,938
  
Number of Holdings
34
  
Portfolio Turnover
514%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Financial Services 58.1   Consumer Finance 15.4   IT Services 11.7   Software 9.3   Capital Markets 2.2   Hotels, Restaurants & Leisure 1.5   Professional Services 1.2       Common Stocks 99.4 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.4                       Short-Term Investments and Net Other Assets (Liabilities) - 0.6   United States 81.0 Canada 11.7 Netherlands 2.3 Uruguay 1.5 Bermuda 1.3 United Kingdom 1.0 New Zealand 0.9 Switzerland 0.3 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 81.0                       Canada - 11.7                              Netherlands - 2.3                          Uruguay - 1.5                              Bermuda - 1.3                              United Kingdom - 1.0                       New Zealand - 0.9                          Switzerland - 0.3                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Visa Inc Class A 12.5   Shopify Inc Class A 11.7   Mastercard Inc Class A 8.2   American Express Co 7.7   Block Inc Class A 6.5   Corpay Inc 4.9   Global Payments Inc 4.0   PayPal Holdings Inc 3.5   Capital One Financial Corp 3.4   Toast Inc Class A 3.3     65.7  
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, 2026 to August 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
 
Enterprise Technology Services Portfolio 
$ 38 
0.65%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.65%
Net Assets $ 1,088,007,902
Holdings Count | shares 38
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,088,007,902
  
Number of Holdings
38
  
Portfolio Turnover
43%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Financial Services 55.7   IT Services 30.1   Professional Services 10.5   Software 2.0   Broadline Retail 1.3   Interactive Media & Services 0.4       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 99.6 Uruguay 0.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.6                       Uruguay - 0.4                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Visa Inc Class A 22.8   Mastercard Inc Class A 18.1   Snowflake Inc 5.1   IBM Corporation 4.7   Cloudflare Inc Class A 4.3   Automatic Data Processing Inc 3.9   Block Inc Class A 3.3   Accenture PLC Class A 3.1   Twilio Inc Class A 2.9   Okta Inc Class A 2.8     71.0  
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, 2026 to August 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
 
Energy Portfolio 
$ 34 
0.61%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.61%
Net Assets $ 4,222,757,613
Holdings Count | shares 38
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,222,757,613
  
Number of Holdings
38
  
Portfolio Turnover
35%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.3   Energy Equipment & Services 17.9   Independent Power and Renewable Electricity Producers 1.4       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   United States 87.5 Canada 7.8 United Kingdom 4.4 Norway 0.2 France 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.5                       Canada - 7.8                               United Kingdom - 4.4                       Norway - 0.2                               France - 0.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ExxonMobil Holdings Corp 23.3   Chevron Corp 11.3   Marathon Petroleum Corp 6.7   Valero Energy Corp 5.1   Cenovus Energy Inc 4.6   TechnipFMC PLC 4.3   Cheniere Energy Inc 4.0   SLB Ltd 3.8   Energy Transfer LP 3.6   Baker Hughes Co Class A 3.4     70.1  
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, 2026 to August 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
 
Defense and Aerospace Portfolio 
$ 30 
0.60%
  
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60%
Net Assets $ 3,682,601,778
Holdings Count | shares 35
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,682,601,778
  
Number of Holdings
35
  
Portfolio Turnover
16%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Aerospace & Defense 98.7   Professional Services 0.6   Electrical Equipment 0.2       Common Stocks 99.5 Short-Term Investments and Net Other Assets (Liabilities) 0.5 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.5                       Short-Term Investments and Net Other Assets (Liabilities) - 0.5   United States 94.6 United Kingdom 3.8 Canada 1.5 Germany 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 94.6                       United Kingdom - 3.8                       Canada - 1.5                               Germany - 0.1                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     GE Aerospace 23.3   RTX Corp 15.4   Boeing Co 10.7   Howmet Aerospace Inc 4.8   HEICO Corp Class A 4.5   General Dynamics Corp 4.2   Carpenter Technology Corp 3.0   Axon Enterprise Inc 2.8   TransDigm Group Inc 2.8   Curtiss-Wright Corp 2.8     74.3  
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, 2026 to August 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
 
Consumer Staples Portfolio 
$ 33 
0.65%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.65%
Net Assets $ 1,255,056,338
Holdings Count | shares 49
Investment Company Portfolio Turnover 53.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,255,056,338
  
Number of Holdings
49
  
Portfolio Turnover
53%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Consumer Staples Distribution & Retail 31.1   Beverages 26.7   Household Products 15.4   Food Products 12.0   Tobacco 7.0   Personal Care Products 6.7   Broadline Retail 1.2   Financial Services 0.0       Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 93.6 United Kingdom 6.4 Italy 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       United Kingdom - 6.4                       Italy - 0.0                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Coca-Cola Co/The 12.1   Procter & Gamble Co/The 11.6   Costco Wholesale Corp 9.3   Walmart Inc 9.0   Keurig Dr Pepper Inc 5.6   Kenvue Inc 4.8   Mondelez International Inc 4.5   British American Tobacco PLC ADR 3.8   Target Corp 3.4   Constellation Brands Inc Class A 3.0     67.1  
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, 2026 to August 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 
$ 29 
0.57%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.57%
Net Assets $ 1,255,056,338
Holdings Count | shares 49
Investment Company Portfolio Turnover 53.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,255,056,338
  
Number of Holdings
49
  
Portfolio Turnover
53%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Consumer Staples Distribution & Retail 31.1   Beverages 26.7   Household Products 15.4   Food Products 12.0   Tobacco 7.0   Personal Care Products 6.7   Broadline Retail 1.2   Financial Services 0.0       Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 93.6 United Kingdom 6.4 Italy 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       United Kingdom - 6.4                       Italy - 0.0                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Coca-Cola Co/The 12.1   Procter & Gamble Co/The 11.6   Costco Wholesale Corp 9.3   Walmart Inc 9.0   Keurig Dr Pepper Inc 5.6   Kenvue Inc 4.8   Mondelez International Inc 4.5   British American Tobacco PLC ADR 3.8   Target Corp 3.4   Constellation Brands Inc Class A 3.0     67.1  
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, 2026 to August 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 
$ 60 
1.19%
  
Expenses Paid, Amount $ 60
Expense Ratio, Percent 1.19%
Net Assets $ 1,255,056,338
Holdings Count | shares 49
Investment Company Portfolio Turnover 53.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,255,056,338
  
Number of Holdings
49
  
Portfolio Turnover
53%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Consumer Staples Distribution & Retail 31.1   Beverages 26.7   Household Products 15.4   Food Products 12.0   Tobacco 7.0   Personal Care Products 6.7   Broadline Retail 1.2   Financial Services 0.0       Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 93.6 United Kingdom 6.4 Italy 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       United Kingdom - 6.4                       Italy - 0.0                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Coca-Cola Co/The 12.1   Procter & Gamble Co/The 11.6   Costco Wholesale Corp 9.3   Walmart Inc 9.0   Keurig Dr Pepper Inc 5.6   Kenvue Inc 4.8   Mondelez International Inc 4.5   British American Tobacco PLC ADR 3.8   Target Corp 3.4   Constellation Brands Inc Class A 3.0     67.1  
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, 2026 to August 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 
$ 35 
0.70%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.70%
Net Assets $ 1,255,056,338
Holdings Count | shares 49
Investment Company Portfolio Turnover 53.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,255,056,338
  
Number of Holdings
49
  
Portfolio Turnover
53%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Consumer Staples Distribution & Retail 31.1   Beverages 26.7   Household Products 15.4   Food Products 12.0   Tobacco 7.0   Personal Care Products 6.7   Broadline Retail 1.2   Financial Services 0.0       Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 93.6 United Kingdom 6.4 Italy 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       United Kingdom - 6.4                       Italy - 0.0                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Coca-Cola Co/The 12.1   Procter & Gamble Co/The 11.6   Costco Wholesale Corp 9.3   Walmart Inc 9.0   Keurig Dr Pepper Inc 5.6   Kenvue Inc 4.8   Mondelez International Inc 4.5   British American Tobacco PLC ADR 3.8   Target Corp 3.4   Constellation Brands Inc Class A 3.0     67.1  
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, 2026 to August 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 
$ 85 
1.69%
  
Expenses Paid, Amount $ 85
Expense Ratio, Percent 1.69%
Net Assets $ 1,255,056,338
Holdings Count | shares 49
Investment Company Portfolio Turnover 53.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,255,056,338
  
Number of Holdings
49
  
Portfolio Turnover
53%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Consumer Staples Distribution & Retail 31.1   Beverages 26.7   Household Products 15.4   Food Products 12.0   Tobacco 7.0   Personal Care Products 6.7   Broadline Retail 1.2   Financial Services 0.0       Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 93.6 United Kingdom 6.4 Italy 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       United Kingdom - 6.4                       Italy - 0.0                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Coca-Cola Co/The 12.1   Procter & Gamble Co/The 11.6   Costco Wholesale Corp 9.3   Walmart Inc 9.0   Keurig Dr Pepper Inc 5.6   Kenvue Inc 4.8   Mondelez International Inc 4.5   British American Tobacco PLC ADR 3.8   Target Corp 3.4   Constellation Brands Inc Class A 3.0     67.1  
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, 2026 to August 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 
$ 48 
0.95%
  
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.95%
Net Assets $ 1,255,056,338
Holdings Count | shares 49
Investment Company Portfolio Turnover 53.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,255,056,338
  
Number of Holdings
49
  
Portfolio Turnover
53%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Consumer Staples Distribution & Retail 31.1   Beverages 26.7   Household Products 15.4   Food Products 12.0   Tobacco 7.0   Personal Care Products 6.7   Broadline Retail 1.2   Financial Services 0.0       Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 93.6 United Kingdom 6.4 Italy 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       United Kingdom - 6.4                       Italy - 0.0                                   
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Coca-Cola Co/The 12.1   Procter & Gamble Co/The 11.6   Costco Wholesale Corp 9.3   Walmart Inc 9.0   Keurig Dr Pepper Inc 5.6   Kenvue Inc 4.8   Mondelez International Inc 4.5   British American Tobacco PLC ADR 3.8   Target Corp 3.4   Constellation Brands Inc Class A 3.0     67.1  
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, 2026 to August 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
 
Consumer Discretionary Portfolio 
$ 33 
0.66%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.66%
Net Assets $ 711,801,099
Holdings Count | shares 59
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$711,801,099
  
Number of Holdings
59
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 27.4   Specialty Retail 23.8   Hotels, Restaurants & Leisure 18.1   Automobiles 16.5   Household Durables 5.3   Textiles, Apparel & Luxury Goods 3.2   Automobile Components 1.9   Consumer Staples Distribution & Retail 1.9   Construction Materials 1.1   Distributors 0.8       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 95.1 Canada 2.4 Brazil 1.3 Mexico 0.5 Finland 0.3 France 0.3 Switzerland 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.1                       Canada - 2.4                               Brazil - 1.3                               Mexico - 0.5                               Finland - 0.3                              France - 0.3                               Switzerland - 0.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Amazon.com Inc 24.0   Tesla Inc 14.6   Home Depot Inc/The 4.3   Lowe's Cos Inc 3.9   McDonald's Corp 3.3   Somnigroup International Inc 2.7   Hilton Worldwide Holdings Inc 2.6   TJX Cos Inc/The 2.5   Ross Stores Inc 2.4   General Motors Co 1.9     62.2  
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, 2026 to August 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
 
Construction and Housing Portfolio 
$ 32 
0.66%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.66%
Net Assets $ 604,137,261
Holdings Count | shares 53
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$604,137,261
  
Number of Holdings
53
  
Portfolio Turnover
19%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Specialty Retail 29.3   Building Products 22.1   Construction & Engineering 18.2   Construction Materials 10.4   Household Durables 9.9   Residential REITs 8.5   Real Estate Management & Development 0.7   Trading Companies & Distributors 0.5   Chemicals 0.4       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   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)     Home Depot Inc/The 14.4   Lowe's Cos Inc 12.1   Johnson Controls International plc 6.6   Trane Technologies PLC 6.3   Quanta Services Inc 5.9   CRH PLC 3.9   Martin Marietta Materials Inc 3.7   Comfort Systems USA Inc 3.7   Invitation Homes Inc 3.0   PulteGroup Inc 2.5     62.1  
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, 2026 to August 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
 
Communication Services Portfolio 
$ 32 
0.62%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.62%
Net Assets $ 2,498,849,258
Holdings Count | shares 56
Investment Company Portfolio Turnover 141.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,498,849,258
  
Number of Holdings
56
  
Portfolio Turnover
141%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 51.7   Entertainment 21.0   Diversified Telecommunication Services 7.1   Media 7.0   Broadline Retail 4.5   Semiconductors & Semiconductor Equipment 1.2   Technology Hardware, Storage & Peripherals 1.0   Software 1.0   Specialty Retail 0.8   Others 0.3       Common Stocks 94.3 Preferred Stocks 1.3 Short-Term Investments and Net Other Assets (Liabilities) 4.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.3                       Preferred Stocks - 1.3                     Short-Term Investments and Net Other Assets (Liabilities) - 4.4   United States 99.3 Taiwan 0.5 Korea (South) 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.3                       Taiwan - 0.5                               Korea (South) - 0.2                           
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Meta Platforms Inc Class A 24.8   Alphabet Inc Class A 24.7   Walt Disney Co/The 4.9   AT&T Inc 4.9   Amazon.com Inc 4.5   Warner Bros Discovery Inc 3.1   Take-Two Interactive Software Inc 3.1   Live Nation Entertainment Inc 2.7   Fox Corp Class A 1.9   Liberty Media Corp-Liberty Formula One Class C 1.8     76.4  
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, 2026 to August 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 
$ 29 
0.55%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.55%
Net Assets $ 2,498,849,258
Holdings Count | shares 56
Investment Company Portfolio Turnover 141.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,498,849,258
  
Number of Holdings
56
  
Portfolio Turnover
141%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 51.7   Entertainment 21.0   Diversified Telecommunication Services 7.1   Media 7.0   Broadline Retail 4.5   Semiconductors & Semiconductor Equipment 1.2   Technology Hardware, Storage & Peripherals 1.0   Software 1.0   Specialty Retail 0.8   Others 0.3       Common Stocks 94.3 Preferred Stocks 1.3 Short-Term Investments and Net Other Assets (Liabilities) 4.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.3                       Preferred Stocks - 1.3                     Short-Term Investments and Net Other Assets (Liabilities) - 4.4   United States 99.3 Taiwan 0.5 Korea (South) 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.3                       Taiwan - 0.5                               Korea (South) - 0.2                           
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Meta Platforms Inc Class A 24.8   Alphabet Inc Class A 24.7   Walt Disney Co/The 4.9   AT&T Inc 4.9   Amazon.com Inc 4.5   Warner Bros Discovery Inc 3.1   Take-Two Interactive Software Inc 3.1   Live Nation Entertainment Inc 2.7   Fox Corp Class A 1.9   Liberty Media Corp-Liberty Formula One Class C 1.8     76.4  
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, 2026 to August 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 
$ 60 
1.16%
  
Expenses Paid, Amount $ 60
Expense Ratio, Percent 1.16%
Net Assets $ 2,498,849,258
Holdings Count | shares 56
Investment Company Portfolio Turnover 141.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,498,849,258
  
Number of Holdings
56
  
Portfolio Turnover
141%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 51.7   Entertainment 21.0   Diversified Telecommunication Services 7.1   Media 7.0   Broadline Retail 4.5   Semiconductors & Semiconductor Equipment 1.2   Technology Hardware, Storage & Peripherals 1.0   Software 1.0   Specialty Retail 0.8   Others 0.3       Common Stocks 94.3 Preferred Stocks 1.3 Short-Term Investments and Net Other Assets (Liabilities) 4.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.3                       Preferred Stocks - 1.3                     Short-Term Investments and Net Other Assets (Liabilities) - 4.4   United States 99.3 Taiwan 0.5 Korea (South) 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.3                       Taiwan - 0.5                               Korea (South) - 0.2                           
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Meta Platforms Inc Class A 24.8   Alphabet Inc Class A 24.7   Walt Disney Co/The 4.9   AT&T Inc 4.9   Amazon.com Inc 4.5   Warner Bros Discovery Inc 3.1   Take-Two Interactive Software Inc 3.1   Live Nation Entertainment Inc 2.7   Fox Corp Class A 1.9   Liberty Media Corp-Liberty Formula One Class C 1.8     76.4  
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, 2026 to August 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 
$ 35 
0.67%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.67%
Net Assets $ 2,498,849,258
Holdings Count | shares 56
Investment Company Portfolio Turnover 141.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,498,849,258
  
Number of Holdings
56
  
Portfolio Turnover
141%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 51.7   Entertainment 21.0   Diversified Telecommunication Services 7.1   Media 7.0   Broadline Retail 4.5   Semiconductors & Semiconductor Equipment 1.2   Technology Hardware, Storage & Peripherals 1.0   Software 1.0   Specialty Retail 0.8   Others 0.3       Common Stocks 94.3 Preferred Stocks 1.3 Short-Term Investments and Net Other Assets (Liabilities) 4.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.3                       Preferred Stocks - 1.3                     Short-Term Investments and Net Other Assets (Liabilities) - 4.4   United States 99.3 Taiwan 0.5 Korea (South) 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.3                       Taiwan - 0.5                               Korea (South) - 0.2                           
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Meta Platforms Inc Class A 24.8   Alphabet Inc Class A 24.7   Walt Disney Co/The 4.9   AT&T Inc 4.9   Amazon.com Inc 4.5   Warner Bros Discovery Inc 3.1   Take-Two Interactive Software Inc 3.1   Live Nation Entertainment Inc 2.7   Fox Corp Class A 1.9   Liberty Media Corp-Liberty Formula One Class C 1.8     76.4  
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, 2026 to August 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 
$ 86 
1.65%
  
Expenses Paid, Amount $ 86
Expense Ratio, Percent 1.65%
Net Assets $ 2,498,849,258
Holdings Count | shares 56
Investment Company Portfolio Turnover 141.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,498,849,258
  
Number of Holdings
56
  
Portfolio Turnover
141%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 51.7   Entertainment 21.0   Diversified Telecommunication Services 7.1   Media 7.0   Broadline Retail 4.5   Semiconductors & Semiconductor Equipment 1.2   Technology Hardware, Storage & Peripherals 1.0   Software 1.0   Specialty Retail 0.8   Others 0.3       Common Stocks 94.3 Preferred Stocks 1.3 Short-Term Investments and Net Other Assets (Liabilities) 4.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.3                       Preferred Stocks - 1.3                     Short-Term Investments and Net Other Assets (Liabilities) - 4.4   United States 99.3 Taiwan 0.5 Korea (South) 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.3                       Taiwan - 0.5                               Korea (South) - 0.2                           
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Meta Platforms Inc Class A 24.8   Alphabet Inc Class A 24.7   Walt Disney Co/The 4.9   AT&T Inc 4.9   Amazon.com Inc 4.5   Warner Bros Discovery Inc 3.1   Take-Two Interactive Software Inc 3.1   Live Nation Entertainment Inc 2.7   Fox Corp Class A 1.9   Liberty Media Corp-Liberty Formula One Class C 1.8     76.4  
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, 2026 to August 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 
$ 48 
0.91%
  
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.91%
Net Assets $ 2,498,849,258
Holdings Count | shares 56
Investment Company Portfolio Turnover 141.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,498,849,258
  
Number of Holdings
56
  
Portfolio Turnover
141%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Interactive Media & Services 51.7   Entertainment 21.0   Diversified Telecommunication Services 7.1   Media 7.0   Broadline Retail 4.5   Semiconductors & Semiconductor Equipment 1.2   Technology Hardware, Storage & Peripherals 1.0   Software 1.0   Specialty Retail 0.8   Others 0.3       Common Stocks 94.3 Preferred Stocks 1.3 Short-Term Investments and Net Other Assets (Liabilities) 4.4 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 94.3                       Preferred Stocks - 1.3                     Short-Term Investments and Net Other Assets (Liabilities) - 4.4   United States 99.3 Taiwan 0.5 Korea (South) 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.3                       Taiwan - 0.5                               Korea (South) - 0.2                           
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Meta Platforms Inc Class A 24.8   Alphabet Inc Class A 24.7   Walt Disney Co/The 4.9   AT&T Inc 4.9   Amazon.com Inc 4.5   Warner Bros Discovery Inc 3.1   Take-Two Interactive Software Inc 3.1   Live Nation Entertainment Inc 2.7   Fox Corp Class A 1.9   Liberty Media Corp-Liberty Formula One Class C 1.8     76.4  
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, 2026 to August 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
 
Chemicals Portfolio 
$ 34 
0.67%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.67%
Net Assets $ 425,155,694
Holdings Count | shares 30
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$425,155,694
  
Number of Holdings
30
  
Portfolio Turnover
13%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Chemicals 99.3       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 99.8 Germany 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.8                       Germany - 0.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Linde PLC 24.6   Sherwin-Williams Co/The 15.1   Element Solutions Inc 5.6   Corteva Inc 4.9   Air Products and Chemicals Inc 4.8   Ecolab Inc 4.7   Scotts Miracle-Gro Co/The 4.4   PPG Industries Inc 4.4   Ingevity Corp 3.5   LyondellBasell Industries NV Class A1 3.3     75.3  
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, 2026 to August 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
 
Brokerage and Investment Management Portfolio 
$ 36 
0.66%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.66%
Net Assets $ 991,187,169
Holdings Count | shares 38
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$991,187,169
  
Number of Holdings
38
  
Portfolio Turnover
52%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Capital Markets 97.0   Financial Services 3.0       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 99.0 Grand Cayman (UK Overseas Ter) 0.5 United Kingdom 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.0                       Grand Cayman (UK Overseas Ter) - 0.5       United Kingdom - 0.5                          
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Charles Schwab Corp/The 9.2   KKR & Co Inc Class A 6.4   Intercontinental Exchange Inc 5.8   Moody's Corp 5.7   Blackrock Inc 5.4   Ares Management Corp Class A 5.3   Blue Owl Capital Inc Class A 5.2   State Street Corp 5.2   S&P Global Inc 3.6   Blackstone Inc 3.6     55.4  
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, 2026 to August 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
 
Biotechnology Portfolio 
$ 33 
0.60%
  
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.60%
Net Assets $ 6,289,020,093
Holdings Count | shares 223
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,289,020,093
  
Number of Holdings
223
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Biotechnology 87.0   Pharmaceuticals 12.5   Life Sciences Tools & Services 0.2   Health Care Providers & Services 0.1   Health Care Technology 0.0   Health Care Equipment & Supplies 0.0   Consumer Staples Distribution & Retail 0.0       Common Stocks 99.1 Preferred Stocks 0.7 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.1                       Preferred Stocks - 0.7                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 90.1 Belgium 3.7 Denmark 2.7 Switzerland 0.8 United Kingdom 0.7 Netherlands 0.6 Canada 0.4 France 0.3 Germany 0.3 Others 0.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 90.1                       Belgium - 3.7                              Denmark - 2.7                              Switzerland - 0.8                          United Kingdom - 0.7                       Netherlands - 0.6                          Canada - 0.4                               France - 0.3                               Germany - 0.3                              Others - 0.4                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     AbbVie Inc 10.5   Krystal Biotech Inc 10.4   Amgen Inc 7.1   Moderna Inc 3.6   Insmed Inc 2.5   Revolution Medicines Inc 2.5   Argenx SE ADR 2.4   Praxis Precision Medicines Inc 2.3   Ascendis Pharma A/S 2.0   Natera Inc 1.7     45.0  
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, 2026 to August 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
 
Banking Portfolio 
$ 36 
0.66%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.66%
Net Assets $ 506,942,064
Holdings Count | shares 39
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$506,942,064
  
Number of Holdings
39
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Banks 98.1   Capital Markets 1.8       Common Stocks 99.9 Short-Term Investments and Net Other Assets (Liabilities) 0.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.9                       Short-Term Investments and Net Other Assets (Liabilities) - 0.1   United States 97.0 Puerto Rico 3.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 97.0                       Puerto Rico - 3.0                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Bank of America Corp 8.2   Wells Fargo & Co 7.5   Citigroup Inc 5.8   US Bancorp 5.4   Huntington Bancshares Inc/OH 4.8   M&T Bank Corp 4.5   KeyCorp 4.3   Truist Financial Corp 4.1   Old National Bancorp/IN 3.8   UMB Financial Corp 3.7     52.1  
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, 2026 to August 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
 
Automotive Portfolio 
$ 39 
0.78%
  
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.78%
Net Assets $ 56,640,761
Holdings Count | shares 34
Investment Company Portfolio Turnover 127.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$56,640,761
  
Number of Holdings
34
  
Portfolio Turnover
127%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Automobiles 53.4   Specialty Retail 24.6   Automobile Components 9.9   Commercial Services & Supplies 5.7   Distributors 1.8   Electrical Equipment 1.5   Hotels, Restaurants & Leisure 0.4   Electronic Equipment, Instruments & Components 0.1       Common Stocks 97.3 Preferred Stocks 0.1 Short-Term Investments and Net Other Assets (Liabilities) 2.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 97.3                       Preferred Stocks - 0.1                     Short-Term Investments and Net Other Assets (Liabilities) - 2.6   United States 68.2 Japan 16.5 Italy 7.3 Canada 3.7 China 3.0 Switzerland 1.3 Korea (South) 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 68.2                       Japan - 16.5                               Italy - 7.3                                Canada - 3.7                               China - 3.0                                Switzerland - 1.3                          Korea (South) - 0.0                           
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Toyota Motor Corp ADR 11.7   O'Reilly Automotive Inc 11.5   General Motors Co 11.5   Tesla Inc 7.9   Ferrari NV 7.3   Ford Motor Co 4.9   Carvana Co Class A 4.8   Honda Motor Co Ltd ADR 4.7   Copart Inc 4.5   Rivian Automotive Inc Class A 2.9     71.7  
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, 2026 to August 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® Natural Resources Fund 
$ 35 
0.66%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.66%
Net Assets $ 1,018,584,302
Holdings Count | shares 47
Investment Company Portfolio Turnover 69.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,018,584,302
  
Number of Holdings
47
  
Portfolio Turnover
69%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 62.4   Metals & Mining 26.6   Chemicals 3.3   Construction Materials 2.9   Containers & Packaging 2.3   Energy Equipment & Services 1.7       Common Stocks 99.2 Short-Term Investments and Net Other Assets (Liabilities) 0.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.2                       Short-Term Investments and Net Other Assets (Liabilities) - 0.8   United States 64.2 Canada 30.7 Brazil 2.8 Portugal 1.3 Zambia 0.6 United Kingdom 0.4 Australia 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 64.2                       Canada - 30.7                              Brazil - 2.8                               Portugal - 1.3                             Zambia - 0.6                               United Kingdom - 0.4                       Australia - 0.0                               
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ExxonMobil Holdings Corp 18.7   ConocoPhillips 6.3   Valero Energy Corp 6.1   Shell PLC ADR 6.0   Suncor Energy Inc (United States) 5.0   Imperial Oil Ltd 5.0   Athabasca Oil Corp 4.4   Phillips 66 4.3   Freeport-McMoRan Inc 3.7   Newmont Corp 3.4     62.9  
Fidelity Climate Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Climate Fund
Class Name Fidelity® Climate Fund
Trading Symbol FSLEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Climate Fund for the period March 1, 2026 to August 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® Climate Fund 
$ 34 
0.66%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.66%
Net Assets $ 660,254,889
Holdings Count | shares 68
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$660,254,889
  
Number of Holdings
68
  
Portfolio Turnover
25%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electrical Equipment 14.8   Software 10.7   Automobiles 9.8   Communications Equipment 9.1   Machinery 8.8   Semiconductors & Semiconductor Equipment 7.7   Building Products 4.5   Commercial Services & Supplies 4.3   Electric Utilities 4.1   Others 25.5       Common Stocks 99.3 Preferred Stocks 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.7 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.3                       Preferred Stocks - 0.0                     Short-Term Investments and Net Other Assets (Liabilities) - 0.7   United States 93.3 Netherlands 3.4 Germany 2.7 Canada 0.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.3                       Netherlands - 3.4                          Germany - 2.7                              Canada - 0.6                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Microsoft Corp 10.4   Tesla Inc 9.4   Arista Networks Inc 4.7   Cisco Systems Inc 4.4   GE Vernova Inc 4.0   Prologis Inc 3.4   Eaton Corp PLC 3.4   NXP Semiconductors NV 3.4   Analog Devices Inc 3.2   NextEra Energy Inc 3.0     49.3  
Fidelity Advisor Utilities Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Utilities Portfolio
Class Name Fidelity Advisor® Utilities Fund Class A
Trading Symbol FFUAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Utilities Portfolio for the period March 1, 2026 to August 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 
$ 43 
0.90%
  
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.90%
Net Assets $ 3,502,084,320
Holdings Count | shares 38
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,502,084,320
  
Number of Holdings
38
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 67.5   Multi-Utilities 17.8   Independent Power and Renewable Electricity Producers 4.7   Commercial Services & Supplies 3.5   Water Utilities 2.6   Electrical Equipment 1.4   Construction & Engineering 0.7   Oil, Gas & Consumable Fuels 0.2       Common Stocks 98.4 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.4                       Short-Term Investments and Net Other Assets (Liabilities) - 1.6   United States 99.4 Germany 0.4 Canada 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.4                       Germany - 0.4                              Canada - 0.2                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NextEra Energy Inc 13.5   American Electric Power Co Inc 6.8   Constellation Energy Corp 6.5   Duke Energy Corp 5.8   Entergy Corp 5.2   Xcel Energy Inc 5.2   Sempra 4.9   Southern Co/The 4.4   Vistra Corp 4.0   Ameren Corp 4.0     60.3  
Fidelity Advisor Utilities Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Utilities Portfolio
Class Name Fidelity Advisor® Utilities Fund Class M
Trading Symbol FFUMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Utilities Portfolio for the period March 1, 2026 to August 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 
$ 55 
1.15%
  
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.15%
Net Assets $ 3,502,084,320
Holdings Count | shares 38
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,502,084,320
  
Number of Holdings
38
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 67.5   Multi-Utilities 17.8   Independent Power and Renewable Electricity Producers 4.7   Commercial Services & Supplies 3.5   Water Utilities 2.6   Electrical Equipment 1.4   Construction & Engineering 0.7   Oil, Gas & Consumable Fuels 0.2       Common Stocks 98.4 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.4                       Short-Term Investments and Net Other Assets (Liabilities) - 1.6   United States 99.4 Germany 0.4 Canada 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.4                       Germany - 0.4                              Canada - 0.2                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NextEra Energy Inc 13.5   American Electric Power Co Inc 6.8   Constellation Energy Corp 6.5   Duke Energy Corp 5.8   Entergy Corp 5.2   Xcel Energy Inc 5.2   Sempra 4.9   Southern Co/The 4.4   Vistra Corp 4.0   Ameren Corp 4.0     60.3  
Fidelity Advisor Utilities Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Utilities Portfolio
Class Name Fidelity Advisor® Utilities Fund Class C
Trading Symbol FFUCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Utilities Portfolio for the period March 1, 2026 to August 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 
$ 78 
1.64%
  
Expenses Paid, Amount $ 78
Expense Ratio, Percent 1.64%
Net Assets $ 3,502,084,320
Holdings Count | shares 38
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,502,084,320
  
Number of Holdings
38
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 67.5   Multi-Utilities 17.8   Independent Power and Renewable Electricity Producers 4.7   Commercial Services & Supplies 3.5   Water Utilities 2.6   Electrical Equipment 1.4   Construction & Engineering 0.7   Oil, Gas & Consumable Fuels 0.2       Common Stocks 98.4 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.4                       Short-Term Investments and Net Other Assets (Liabilities) - 1.6   United States 99.4 Germany 0.4 Canada 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.4                       Germany - 0.4                              Canada - 0.2                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NextEra Energy Inc 13.5   American Electric Power Co Inc 6.8   Constellation Energy Corp 6.5   Duke Energy Corp 5.8   Entergy Corp 5.2   Xcel Energy Inc 5.2   Sempra 4.9   Southern Co/The 4.4   Vistra Corp 4.0   Ameren Corp 4.0     60.3  
Fidelity Advisor Utilities Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Utilities Portfolio
Class Name Fidelity Advisor® Utilities Fund Class I
Trading Symbol FFUIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Utilities Portfolio for the period March 1, 2026 to August 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 
$ 31 
0.66%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.66%
Net Assets $ 3,502,084,320
Holdings Count | shares 38
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,502,084,320
  
Number of Holdings
38
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 67.5   Multi-Utilities 17.8   Independent Power and Renewable Electricity Producers 4.7   Commercial Services & Supplies 3.5   Water Utilities 2.6   Electrical Equipment 1.4   Construction & Engineering 0.7   Oil, Gas & Consumable Fuels 0.2       Common Stocks 98.4 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.4                       Short-Term Investments and Net Other Assets (Liabilities) - 1.6   United States 99.4 Germany 0.4 Canada 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.4                       Germany - 0.4                              Canada - 0.2                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NextEra Energy Inc 13.5   American Electric Power Co Inc 6.8   Constellation Energy Corp 6.5   Duke Energy Corp 5.8   Entergy Corp 5.2   Xcel Energy Inc 5.2   Sempra 4.9   Southern Co/The 4.4   Vistra Corp 4.0   Ameren Corp 4.0     60.3  
Fidelity Advisor Utilities Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Utilities Portfolio
Class Name Fidelity Advisor® Utilities Fund Class Z
Trading Symbol FFUZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Utilities Portfolio for the period March 1, 2026 to August 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 
$ 26 
0.54%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.54%
Net Assets $ 3,502,084,320
Holdings Count | shares 38
Investment Company Portfolio Turnover 60.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$3,502,084,320
  
Number of Holdings
38
  
Portfolio Turnover
60%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Electric Utilities 67.5   Multi-Utilities 17.8   Independent Power and Renewable Electricity Producers 4.7   Commercial Services & Supplies 3.5   Water Utilities 2.6   Electrical Equipment 1.4   Construction & Engineering 0.7   Oil, Gas & Consumable Fuels 0.2       Common Stocks 98.4 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.4                       Short-Term Investments and Net Other Assets (Liabilities) - 1.6   United States 99.4 Germany 0.4 Canada 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 99.4                       Germany - 0.4                              Canada - 0.2                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NextEra Energy Inc 13.5   American Electric Power Co Inc 6.8   Constellation Energy Corp 6.5   Duke Energy Corp 5.8   Entergy Corp 5.2   Xcel Energy Inc 5.2   Sempra 4.9   Southern Co/The 4.4   Vistra Corp 4.0   Ameren Corp 4.0     60.3  
Fidelity Advisor Technology Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Technology Portfolio
Class Name Fidelity Advisor® Technology Fund Class A
Trading Symbol FFONX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Technology Portfolio for the period March 1, 2026 to August 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 
$ 53 
0.87%
  
Expenses Paid, Amount $ 53
Expense Ratio, Percent 0.87%
Net Assets $ 36,944,355,957
Holdings Count | shares 126
Investment Company Portfolio Turnover 95.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$36,944,355,957
  
Number of Holdings
126
  
Portfolio Turnover
95%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 43.2   Technology Hardware, Storage & Peripherals 20.5   Software 18.7   IT Services 5.7   Communications Equipment 4.8   Electronic Equipment, Instruments & Components 2.7   Broadline Retail 2.6   Interactive Media & Services 0.9   Financial Services 0.2   Others 0.5       Common Stocks 95.1 Preferred Stocks 4.7 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.1                       Preferred Stocks - 4.7                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 93.6 Taiwan 2.7 Netherlands 2.2 Canada 1.1 United Kingdom 0.2 China 0.1 Israel 0.1 Estonia 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       Taiwan - 2.7                               Netherlands - 2.2                          Canada - 1.1                               United Kingdom - 0.2                       China - 0.1                                Israel - 0.1                               Estonia - 0.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 18.8   Apple Inc 15.7   Microsoft Corp 8.4   Micron Technology Inc 3.5   Cisco Systems Inc 3.4   Marvell Technology Inc 2.8   Amazon.com Inc 2.6   Intel Corp 2.3   Western Digital Corp 2.3   Advanced Micro Devices Inc 1.9     61.7  
Fidelity Advisor Technology Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Technology Portfolio
Class Name Fidelity Advisor® Technology Fund Class M
Trading Symbol FFOJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Technology Portfolio for the period March 1, 2026 to August 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 
$ 68 
1.12%
  
Expenses Paid, Amount $ 68
Expense Ratio, Percent 1.12%
Net Assets $ 36,944,355,957
Holdings Count | shares 126
Investment Company Portfolio Turnover 95.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$36,944,355,957
  
Number of Holdings
126
  
Portfolio Turnover
95%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 43.2   Technology Hardware, Storage & Peripherals 20.5   Software 18.7   IT Services 5.7   Communications Equipment 4.8   Electronic Equipment, Instruments & Components 2.7   Broadline Retail 2.6   Interactive Media & Services 0.9   Financial Services 0.2   Others 0.5       Common Stocks 95.1 Preferred Stocks 4.7 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.1                       Preferred Stocks - 4.7                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 93.6 Taiwan 2.7 Netherlands 2.2 Canada 1.1 United Kingdom 0.2 China 0.1 Israel 0.1 Estonia 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       Taiwan - 2.7                               Netherlands - 2.2                          Canada - 1.1                               United Kingdom - 0.2                       China - 0.1                                Israel - 0.1                               Estonia - 0.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 18.8   Apple Inc 15.7   Microsoft Corp 8.4   Micron Technology Inc 3.5   Cisco Systems Inc 3.4   Marvell Technology Inc 2.8   Amazon.com Inc 2.6   Intel Corp 2.3   Western Digital Corp 2.3   Advanced Micro Devices Inc 1.9     61.7  
Fidelity Advisor Technology Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Technology Portfolio
Class Name Fidelity Advisor® Technology Fund Class C
Trading Symbol FFOQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Technology Portfolio for the period March 1, 2026 to August 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 
$ 97 
1.61%
  
Expenses Paid, Amount $ 97
Expense Ratio, Percent 1.61%
Net Assets $ 36,944,355,957
Holdings Count | shares 126
Investment Company Portfolio Turnover 95.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$36,944,355,957
  
Number of Holdings
126
  
Portfolio Turnover
95%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 43.2   Technology Hardware, Storage & Peripherals 20.5   Software 18.7   IT Services 5.7   Communications Equipment 4.8   Electronic Equipment, Instruments & Components 2.7   Broadline Retail 2.6   Interactive Media & Services 0.9   Financial Services 0.2   Others 0.5       Common Stocks 95.1 Preferred Stocks 4.7 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.1                       Preferred Stocks - 4.7                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 93.6 Taiwan 2.7 Netherlands 2.2 Canada 1.1 United Kingdom 0.2 China 0.1 Israel 0.1 Estonia 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       Taiwan - 2.7                               Netherlands - 2.2                          Canada - 1.1                               United Kingdom - 0.2                       China - 0.1                                Israel - 0.1                               Estonia - 0.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 18.8   Apple Inc 15.7   Microsoft Corp 8.4   Micron Technology Inc 3.5   Cisco Systems Inc 3.4   Marvell Technology Inc 2.8   Amazon.com Inc 2.6   Intel Corp 2.3   Western Digital Corp 2.3   Advanced Micro Devices Inc 1.9     61.7  
Fidelity Advisor Technology Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Technology Portfolio
Class Name Fidelity Advisor® Technology Fund Class I
Trading Symbol FFOMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Technology Portfolio for the period March 1, 2026 to August 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 
$ 38 
0.63%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.63%
Net Assets $ 36,944,355,957
Holdings Count | shares 126
Investment Company Portfolio Turnover 95.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$36,944,355,957
  
Number of Holdings
126
  
Portfolio Turnover
95%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 43.2   Technology Hardware, Storage & Peripherals 20.5   Software 18.7   IT Services 5.7   Communications Equipment 4.8   Electronic Equipment, Instruments & Components 2.7   Broadline Retail 2.6   Interactive Media & Services 0.9   Financial Services 0.2   Others 0.5       Common Stocks 95.1 Preferred Stocks 4.7 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.1                       Preferred Stocks - 4.7                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 93.6 Taiwan 2.7 Netherlands 2.2 Canada 1.1 United Kingdom 0.2 China 0.1 Israel 0.1 Estonia 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       Taiwan - 2.7                               Netherlands - 2.2                          Canada - 1.1                               United Kingdom - 0.2                       China - 0.1                                Israel - 0.1                               Estonia - 0.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 18.8   Apple Inc 15.7   Microsoft Corp 8.4   Micron Technology Inc 3.5   Cisco Systems Inc 3.4   Marvell Technology Inc 2.8   Amazon.com Inc 2.6   Intel Corp 2.3   Western Digital Corp 2.3   Advanced Micro Devices Inc 1.9     61.7  
Fidelity Advisor Technology Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Technology Portfolio
Class Name Fidelity Advisor® Technology Fund Class Z
Trading Symbol FFOTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Technology Portfolio for the period March 1, 2026 to August 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 
$ 31 
0.52%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.52%
Net Assets $ 36,944,355,957
Holdings Count | shares 126
Investment Company Portfolio Turnover 95.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$36,944,355,957
  
Number of Holdings
126
  
Portfolio Turnover
95%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Semiconductors & Semiconductor Equipment 43.2   Technology Hardware, Storage & Peripherals 20.5   Software 18.7   IT Services 5.7   Communications Equipment 4.8   Electronic Equipment, Instruments & Components 2.7   Broadline Retail 2.6   Interactive Media & Services 0.9   Financial Services 0.2   Others 0.5       Common Stocks 95.1 Preferred Stocks 4.7 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.1                       Preferred Stocks - 4.7                     Bonds - 0.0                                Short-Term Investments and Net Other Assets (Liabilities) - 0.2   United States 93.6 Taiwan 2.7 Netherlands 2.2 Canada 1.1 United Kingdom 0.2 China 0.1 Israel 0.1 Estonia 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 93.6                       Taiwan - 2.7                               Netherlands - 2.2                          Canada - 1.1                               United Kingdom - 0.2                       China - 0.1                                Israel - 0.1                               Estonia - 0.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 18.8   Apple Inc 15.7   Microsoft Corp 8.4   Micron Technology Inc 3.5   Cisco Systems Inc 3.4   Marvell Technology Inc 2.8   Amazon.com Inc 2.6   Intel Corp 2.3   Western Digital Corp 2.3   Advanced Micro Devices Inc 1.9     61.7  
Fidelity Advisor Consumer Discretionary Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Consumer Discretionary Portfolio
Class Name Fidelity Advisor® Consumer Discretionary Fund Class A
Trading Symbol FFNRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Discretionary Portfolio for the period March 1, 2026 to August 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 
$ 48 
0.96%
  
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.96%
Net Assets $ 711,801,099
Holdings Count | shares 59
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$711,801,099
  
Number of Holdings
59
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 27.4   Specialty Retail 23.8   Hotels, Restaurants & Leisure 18.1   Automobiles 16.5   Household Durables 5.3   Textiles, Apparel & Luxury Goods 3.2   Automobile Components 1.9   Consumer Staples Distribution & Retail 1.9   Construction Materials 1.1   Distributors 0.8       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 95.1 Canada 2.4 Brazil 1.3 Mexico 0.5 Finland 0.3 France 0.3 Switzerland 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.1                       Canada - 2.4                               Brazil - 1.3                               Mexico - 0.5                               Finland - 0.3                              France - 0.3                               Switzerland - 0.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Amazon.com Inc 24.0   Tesla Inc 14.6   Home Depot Inc/The 4.3   Lowe's Cos Inc 3.9   McDonald's Corp 3.3   Somnigroup International Inc 2.7   Hilton Worldwide Holdings Inc 2.6   TJX Cos Inc/The 2.5   Ross Stores Inc 2.4   General Motors Co 1.9     62.2  
Fidelity Advisor Consumer Discretionary Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Consumer Discretionary Portfolio
Class Name Fidelity Advisor® Consumer Discretionary Fund Class M
Trading Symbol FFNNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Discretionary Portfolio for the period March 1, 2026 to August 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 
$ 61 
1.21%
  
Expenses Paid, Amount $ 61
Expense Ratio, Percent 1.21%
Net Assets $ 711,801,099
Holdings Count | shares 59
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$711,801,099
  
Number of Holdings
59
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 27.4   Specialty Retail 23.8   Hotels, Restaurants & Leisure 18.1   Automobiles 16.5   Household Durables 5.3   Textiles, Apparel & Luxury Goods 3.2   Automobile Components 1.9   Consumer Staples Distribution & Retail 1.9   Construction Materials 1.1   Distributors 0.8       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 95.1 Canada 2.4 Brazil 1.3 Mexico 0.5 Finland 0.3 France 0.3 Switzerland 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.1                       Canada - 2.4                               Brazil - 1.3                               Mexico - 0.5                               Finland - 0.3                              France - 0.3                               Switzerland - 0.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Amazon.com Inc 24.0   Tesla Inc 14.6   Home Depot Inc/The 4.3   Lowe's Cos Inc 3.9   McDonald's Corp 3.3   Somnigroup International Inc 2.7   Hilton Worldwide Holdings Inc 2.6   TJX Cos Inc/The 2.5   Ross Stores Inc 2.4   General Motors Co 1.9     62.2  
Fidelity Advisor Consumer Discretionary Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Consumer Discretionary Portfolio
Class Name Fidelity Advisor® Consumer Discretionary Fund Class C
Trading Symbol FFNSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Discretionary Portfolio for the period March 1, 2026 to August 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 
$ 86 
1.70%
  
Expenses Paid, Amount $ 86
Expense Ratio, Percent 1.70%
Net Assets $ 711,801,099
Holdings Count | shares 59
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$711,801,099
  
Number of Holdings
59
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 27.4   Specialty Retail 23.8   Hotels, Restaurants & Leisure 18.1   Automobiles 16.5   Household Durables 5.3   Textiles, Apparel & Luxury Goods 3.2   Automobile Components 1.9   Consumer Staples Distribution & Retail 1.9   Construction Materials 1.1   Distributors 0.8       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 95.1 Canada 2.4 Brazil 1.3 Mexico 0.5 Finland 0.3 France 0.3 Switzerland 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.1                       Canada - 2.4                               Brazil - 1.3                               Mexico - 0.5                               Finland - 0.3                              France - 0.3                               Switzerland - 0.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Amazon.com Inc 24.0   Tesla Inc 14.6   Home Depot Inc/The 4.3   Lowe's Cos Inc 3.9   McDonald's Corp 3.3   Somnigroup International Inc 2.7   Hilton Worldwide Holdings Inc 2.6   TJX Cos Inc/The 2.5   Ross Stores Inc 2.4   General Motors Co 1.9     62.2  
Fidelity Advisor Consumer Discretionary Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Consumer Discretionary Portfolio
Class Name Fidelity Advisor® Consumer Discretionary Fund Class I
Trading Symbol FFNQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Discretionary Portfolio for the period March 1, 2026 to August 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 
$ 35 
0.70%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.70%
Net Assets $ 711,801,099
Holdings Count | shares 59
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$711,801,099
  
Number of Holdings
59
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 27.4   Specialty Retail 23.8   Hotels, Restaurants & Leisure 18.1   Automobiles 16.5   Household Durables 5.3   Textiles, Apparel & Luxury Goods 3.2   Automobile Components 1.9   Consumer Staples Distribution & Retail 1.9   Construction Materials 1.1   Distributors 0.8       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 95.1 Canada 2.4 Brazil 1.3 Mexico 0.5 Finland 0.3 France 0.3 Switzerland 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.1                       Canada - 2.4                               Brazil - 1.3                               Mexico - 0.5                               Finland - 0.3                              France - 0.3                               Switzerland - 0.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Amazon.com Inc 24.0   Tesla Inc 14.6   Home Depot Inc/The 4.3   Lowe's Cos Inc 3.9   McDonald's Corp 3.3   Somnigroup International Inc 2.7   Hilton Worldwide Holdings Inc 2.6   TJX Cos Inc/The 2.5   Ross Stores Inc 2.4   General Motors Co 1.9     62.2  
Fidelity Advisor Consumer Discretionary Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Consumer Discretionary Portfolio
Class Name Fidelity Advisor® Consumer Discretionary Fund Class Z
Trading Symbol FFNUX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Consumer Discretionary Portfolio for the period March 1, 2026 to August 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 
$ 29 
0.57%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.57%
Net Assets $ 711,801,099
Holdings Count | shares 59
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$711,801,099
  
Number of Holdings
59
  
Portfolio Turnover
23%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Broadline Retail 27.4   Specialty Retail 23.8   Hotels, Restaurants & Leisure 18.1   Automobiles 16.5   Household Durables 5.3   Textiles, Apparel & Luxury Goods 3.2   Automobile Components 1.9   Consumer Staples Distribution & Retail 1.9   Construction Materials 1.1   Distributors 0.8       Common Stocks 100.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.0                      Short-Term Investments and Net Other Assets (Liabilities) - 0.0   United States 95.1 Canada 2.4 Brazil 1.3 Mexico 0.5 Finland 0.3 France 0.3 Switzerland 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.1                       Canada - 2.4                               Brazil - 1.3                               Mexico - 0.5                               Finland - 0.3                              France - 0.3                               Switzerland - 0.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Amazon.com Inc 24.0   Tesla Inc 14.6   Home Depot Inc/The 4.3   Lowe's Cos Inc 3.9   McDonald's Corp 3.3   Somnigroup International Inc 2.7   Hilton Worldwide Holdings Inc 2.6   TJX Cos Inc/The 2.5   Ross Stores Inc 2.4   General Motors Co 1.9     62.2  
Fidelity Advisor Energy Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Energy Portfolio
Class Name Fidelity Advisor® Energy Fund Class A
Trading Symbol FFOBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Energy Portfolio for the period March 1, 2026 to August 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 
$ 50 
0.90%
  
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.90%
Net Assets $ 4,222,757,613
Holdings Count | shares 38
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,222,757,613
  
Number of Holdings
38
  
Portfolio Turnover
35%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.3   Energy Equipment & Services 17.9   Independent Power and Renewable Electricity Producers 1.4       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   United States 87.5 Canada 7.8 United Kingdom 4.4 Norway 0.2 France 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.5                       Canada - 7.8                               United Kingdom - 4.4                       Norway - 0.2                               France - 0.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ExxonMobil Holdings Corp 23.3   Chevron Corp 11.3   Marathon Petroleum Corp 6.7   Valero Energy Corp 5.1   Cenovus Energy Inc 4.6   TechnipFMC PLC 4.3   Cheniere Energy Inc 4.0   SLB Ltd 3.8   Energy Transfer LP 3.6   Baker Hughes Co Class A 3.4     70.1  
Fidelity Advisor Energy Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Energy Portfolio
Class Name Fidelity Advisor® Energy Fund Class M
Trading Symbol FFNVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Energy Portfolio for the period March 1, 2026 to August 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 
$ 64 
1.15%
  
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.15%
Net Assets $ 4,222,757,613
Holdings Count | shares 38
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,222,757,613
  
Number of Holdings
38
  
Portfolio Turnover
35%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.3   Energy Equipment & Services 17.9   Independent Power and Renewable Electricity Producers 1.4       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   United States 87.5 Canada 7.8 United Kingdom 4.4 Norway 0.2 France 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.5                       Canada - 7.8                               United Kingdom - 4.4                       Norway - 0.2                               France - 0.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ExxonMobil Holdings Corp 23.3   Chevron Corp 11.3   Marathon Petroleum Corp 6.7   Valero Energy Corp 5.1   Cenovus Energy Inc 4.6   TechnipFMC PLC 4.3   Cheniere Energy Inc 4.0   SLB Ltd 3.8   Energy Transfer LP 3.6   Baker Hughes Co Class A 3.4     70.1  
Fidelity Advisor Energy Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Energy Portfolio
Class Name Fidelity Advisor® Energy Fund Class C
Trading Symbol FFOEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Energy Portfolio for the period March 1, 2026 to August 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 
$ 91 
1.64%
  
Expenses Paid, Amount $ 91
Expense Ratio, Percent 1.64%
Net Assets $ 4,222,757,613
Holdings Count | shares 38
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,222,757,613
  
Number of Holdings
38
  
Portfolio Turnover
35%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.3   Energy Equipment & Services 17.9   Independent Power and Renewable Electricity Producers 1.4       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   United States 87.5 Canada 7.8 United Kingdom 4.4 Norway 0.2 France 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.5                       Canada - 7.8                               United Kingdom - 4.4                       Norway - 0.2                               France - 0.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ExxonMobil Holdings Corp 23.3   Chevron Corp 11.3   Marathon Petroleum Corp 6.7   Valero Energy Corp 5.1   Cenovus Energy Inc 4.6   TechnipFMC PLC 4.3   Cheniere Energy Inc 4.0   SLB Ltd 3.8   Energy Transfer LP 3.6   Baker Hughes Co Class A 3.4     70.1  
Fidelity Advisor Energy Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Energy Portfolio
Class Name Fidelity Advisor® Energy Fund Class I
Trading Symbol FFNWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Energy Portfolio for the period March 1, 2026 to August 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 
$ 36 
0.66%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.66%
Net Assets $ 4,222,757,613
Holdings Count | shares 38
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,222,757,613
  
Number of Holdings
38
  
Portfolio Turnover
35%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.3   Energy Equipment & Services 17.9   Independent Power and Renewable Electricity Producers 1.4       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   United States 87.5 Canada 7.8 United Kingdom 4.4 Norway 0.2 France 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.5                       Canada - 7.8                               United Kingdom - 4.4                       Norway - 0.2                               France - 0.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ExxonMobil Holdings Corp 23.3   Chevron Corp 11.3   Marathon Petroleum Corp 6.7   Valero Energy Corp 5.1   Cenovus Energy Inc 4.6   TechnipFMC PLC 4.3   Cheniere Energy Inc 4.0   SLB Ltd 3.8   Energy Transfer LP 3.6   Baker Hughes Co Class A 3.4     70.1  
Fidelity Advisor Energy Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Energy Portfolio
Class Name Fidelity Advisor® Energy Fund Class Z
Trading Symbol FFOHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Energy Portfolio for the period March 1, 2026 to August 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 
$ 30 
0.54%
  
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.54%
Net Assets $ 4,222,757,613
Holdings Count | shares 38
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$4,222,757,613
  
Number of Holdings
38
  
Portfolio Turnover
35%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Oil, Gas & Consumable Fuels 80.3   Energy Equipment & Services 17.9   Independent Power and Renewable Electricity Producers 1.4       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   United States 87.5 Canada 7.8 United Kingdom 4.4 Norway 0.2 France 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 87.5                       Canada - 7.8                               United Kingdom - 4.4                       Norway - 0.2                               France - 0.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ExxonMobil Holdings Corp 23.3   Chevron Corp 11.3   Marathon Petroleum Corp 6.7   Valero Energy Corp 5.1   Cenovus Energy Inc 4.6   TechnipFMC PLC 4.3   Cheniere Energy Inc 4.0   SLB Ltd 3.8   Energy Transfer LP 3.6   Baker Hughes Co Class A 3.4     70.1  
Fidelity Advisor Financials Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Financials Portfolio
Class Name Fidelity Advisor® Financials Fund Class A
Trading Symbol FIVGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Financials Portfolio for the period August 6, 2026 to August 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 AA 
$ 7 
0.95%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 7
Expense Ratio, Percent 0.95%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 1,561,693,325
Holdings Count | shares 65
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,561,693,325
  
Number of Holdings
65
  
Portfolio Turnover
27%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Banks 33.8   Capital Markets 28.1   Insurance 18.1   Financial Services 14.2   Consumer Finance 4.5   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)     Common Stocks - 99.7                       Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 95.6 United Kingdom 1.1 Australia 0.8 Grand Cayman (UK Overseas Ter) 0.7 Puerto Rico 0.7 Mexico 0.6 France 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.6                       United Kingdom - 1.1                       Australia - 0.8                            Grand Cayman (UK Overseas Ter) - 0.7       Puerto Rico - 0.7                          Mexico - 0.6                               France - 0.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Mastercard Inc Class A 8.4   Bank of America Corp 7.5   Wells Fargo & Co 7.0   Charles Schwab Corp/The 4.6   Reinsurance Group of America Inc 4.0   Citigroup Inc 4.0   State Street Corp 3.8   Morgan Stanley 2.5   KKR & Co Inc Class A 2.4   Capital One Financial Corp 2.4     46.6  
Fidelity Advisor Financials Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Financials Portfolio
Class Name Fidelity Advisor® Financials Fund Class M
Trading Symbol FIVHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Financials Portfolio for the period August 6, 2026 to August 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 MA 
$ 9 
1.19%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 9
Expense Ratio, Percent 1.19%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 1,561,693,325
Holdings Count | shares 65
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,561,693,325
  
Number of Holdings
65
  
Portfolio Turnover
27%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Banks 33.8   Capital Markets 28.1   Insurance 18.1   Financial Services 14.2   Consumer Finance 4.5   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)     Common Stocks - 99.7                       Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 95.6 United Kingdom 1.1 Australia 0.8 Grand Cayman (UK Overseas Ter) 0.7 Puerto Rico 0.7 Mexico 0.6 France 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.6                       United Kingdom - 1.1                       Australia - 0.8                            Grand Cayman (UK Overseas Ter) - 0.7       Puerto Rico - 0.7                          Mexico - 0.6                               France - 0.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Mastercard Inc Class A 8.4   Bank of America Corp 7.5   Wells Fargo & Co 7.0   Charles Schwab Corp/The 4.6   Reinsurance Group of America Inc 4.0   Citigroup Inc 4.0   State Street Corp 3.8   Morgan Stanley 2.5   KKR & Co Inc Class A 2.4   Capital One Financial Corp 2.4     46.6  
Fidelity Advisor Financials Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Financials Portfolio
Class Name Fidelity Advisor® Financials Fund Class C
Trading Symbol FIVJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Financials Portfolio for the period August 6, 2026 to August 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 CA 
$ 12 
1.69%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 12
Expense Ratio, Percent 1.69%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 1,561,693,325
Holdings Count | shares 65
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,561,693,325
  
Number of Holdings
65
  
Portfolio Turnover
27%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Banks 33.8   Capital Markets 28.1   Insurance 18.1   Financial Services 14.2   Consumer Finance 4.5   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)     Common Stocks - 99.7                       Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 95.6 United Kingdom 1.1 Australia 0.8 Grand Cayman (UK Overseas Ter) 0.7 Puerto Rico 0.7 Mexico 0.6 France 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.6                       United Kingdom - 1.1                       Australia - 0.8                            Grand Cayman (UK Overseas Ter) - 0.7       Puerto Rico - 0.7                          Mexico - 0.6                               France - 0.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Mastercard Inc Class A 8.4   Bank of America Corp 7.5   Wells Fargo & Co 7.0   Charles Schwab Corp/The 4.6   Reinsurance Group of America Inc 4.0   Citigroup Inc 4.0   State Street Corp 3.8   Morgan Stanley 2.5   KKR & Co Inc Class A 2.4   Capital One Financial Corp 2.4     46.6  
Fidelity Advisor Financials Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Financials Portfolio
Class Name Fidelity Advisor® Financials Fund Class I
Trading Symbol FIVKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Financials Portfolio for the period August 6, 2026 to August 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 IA 
$ 5 
0.70%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.70%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 1,561,693,325
Holdings Count | shares 65
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,561,693,325
  
Number of Holdings
65
  
Portfolio Turnover
27%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Banks 33.8   Capital Markets 28.1   Insurance 18.1   Financial Services 14.2   Consumer Finance 4.5   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)     Common Stocks - 99.7                       Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 95.6 United Kingdom 1.1 Australia 0.8 Grand Cayman (UK Overseas Ter) 0.7 Puerto Rico 0.7 Mexico 0.6 France 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.6                       United Kingdom - 1.1                       Australia - 0.8                            Grand Cayman (UK Overseas Ter) - 0.7       Puerto Rico - 0.7                          Mexico - 0.6                               France - 0.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Mastercard Inc Class A 8.4   Bank of America Corp 7.5   Wells Fargo & Co 7.0   Charles Schwab Corp/The 4.6   Reinsurance Group of America Inc 4.0   Citigroup Inc 4.0   State Street Corp 3.8   Morgan Stanley 2.5   KKR & Co Inc Class A 2.4   Capital One Financial Corp 2.4     46.6  
Fidelity Advisor Financials Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Financials Portfolio
Class Name Fidelity Advisor® Financials Fund Class Z
Trading Symbol FIVSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Financials Portfolio for the period August 6, 2026 to August 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 ZA 
$ 4 
0.57%
  
AExpenses for the full reporting period would be higher.
 
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.57%
Expenses Short Period Footnote [Text Block] Expenses for the full reporting period would be higher.
Net Assets $ 1,561,693,325
Holdings Count | shares 65
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,561,693,325
  
Number of Holdings
65
  
Portfolio Turnover
27%
  
Holdings [Text Block]       TOP INDUSTRIES (% of Fund's net assets) Banks 33.8   Capital Markets 28.1   Insurance 18.1   Financial Services 14.2   Consumer Finance 4.5   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)     Common Stocks - 99.7                       Short-Term Investments and Net Other Assets (Liabilities) - 0.3   United States 95.6 United Kingdom 1.1 Australia 0.8 Grand Cayman (UK Overseas Ter) 0.7 Puerto Rico 0.7 Mexico 0.6 France 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.6                       United Kingdom - 1.1                       Australia - 0.8                            Grand Cayman (UK Overseas Ter) - 0.7       Puerto Rico - 0.7                          Mexico - 0.6                               France - 0.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Mastercard Inc Class A 8.4   Bank of America Corp 7.5   Wells Fargo & Co 7.0   Charles Schwab Corp/The 4.6   Reinsurance Group of America Inc 4.0   Citigroup Inc 4.0   State Street Corp 3.8   Morgan Stanley 2.5   KKR & Co Inc Class A 2.4   Capital One Financial Corp 2.4     46.6