| Form N-CSR Cover | 12 Months Ended |
| Jul. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Select Portfolios |
| Entity Central Index Key | 0000320351 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Jul. 31, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Select Portfolios |
| Entity Central Index Key | 0000320351 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| Fidelity Advisor International Real Estate Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® International Real Estate Fund |
| Class Name | Fidelity Advisor® International Real Estate Fund Class A |
| Trading Symbol | FIRAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $ 1.20 % |
| Expenses Paid, Amount | $ 120 |
| Expense Ratio, Percent | 1.20% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B26"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE July 31, 2014 through July 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class A $9,425 $9,582 $9,750 $10,675 $11,581 $12,300 $12,511 $16,071 $13,539 $12,002 $12,046 FTSE® EPRA℠/NAREIT® Developed ex North America Index $10,000 $9,831 $10,363 $10,710 $11,550 $12,008 $10,537 $13,594 $11,122 $10,055 $10,502 MSCI EAFE Index $10,000 $9,986 $9,252 $10,918 $11,642 $11,365 $11,197 $14,617 $12,552 $14,692 $16,376 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Class A (incl. 5.75% sales charge) -5.40% -1.59% 1.88% Class A (without 5.75% sales charge) 0.37% -0.42% 2.48% FTSE® EPRA℠/NAREIT® Developed ex North America Index 4.45% -2.64% 0.49% MSCI EAFE Index 11.46% 7.58% 5.06% Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 485,725,289 |
| Holdings Count | shares | 77 |
| Advisory Fees Paid, Amount | $ 3,520,499 |
| Investment Company Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of July 31, 2024) KEY FACTS Fund Size $ Number of Holdings 77 Total Advisory Fee $ Portfolio Turnover 84 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 34.6 Industrial REITs 15.7 Residential REITs 11.9 Specialized REITs 11.6 Health Care REITs 5.6 Retail REITs 3.6 Household Durables 2.9 Office REITs 2.0 Diversified REITs 1.5 Others 5.2 Common Stocks 94.6 Short-Term Investments and Net Other Assets (Liabilities) 5.4 ASSET ALLOCATION (% of Fund's net assets) Japan 22.6 United Kingdom 13.5 Australia 12.6 United States 11.3 Singapore 8.4 Hong Kong 6.2 Sweden 5.4 France 4.8 Spain 4.1 Others 11.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Wing Tai Holdings Ltd 4.6 Prologis Inc 4.2 Nomura Real Estate Holdings Inc 3.7 National Storage REIT unit 3.5 Segro PLC 3.2 Advance Residence Investment Corp 2.9 Daiwa Securities Living Investment Corporation 2.9 Ingenia Communities Group unit 2.8 Arena REIT unit 2.7 CK Asset Holdings Ltd 2.6 33.1 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-877-208-0098</span>" id="sjs-B41"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B42"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B43"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Real Estate Investment Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Real Estate Investment Portfolio |
| Class Name | Fidelity® Real Estate Investment Portfolio |
| Trading Symbol | FRESX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Real Estate Investment Portfolio for the period August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Real Estate Investment Portfolio $ 0.69 % |
| Expenses Paid, Amount | $ 73 |
| Expense Ratio, Percent | 0.69% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B60"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE July 31, 2014 through July 31, 2024. Initial investment of $10,000. Fidelity® Real Estate Investment Portfolio $10,000 $11,034 $13,682 $13,006 $13,413 $15,062 $14,136 $18,584 $18,171 $16,467 $18,160 MSCI US IMI Real Estate 25/50 Linked Index $10,000 $11,129 $13,457 $12,695 $13,185 $14,621 $12,238 $16,556 $15,854 $14,323 $15,860 S&P 500® Index $10,000 $11,121 $11,745 $13,629 $15,843 $17,108 $19,153 $26,134 $24,921 $28,165 $34,403 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® Real Estate Investment Portfolio 10.28% 3.81% 6.15% MSCI US IMI Real Estate 25/50 Linked Index 10.73% 1.64% 4.72% S&P 500® Index 22.15% 15.00% 13.15% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 2,619,172,869 |
| Holdings Count | shares | 42 |
| Advisory Fees Paid, Amount | $ 14,405,798 |
| Investment Company Portfolio Turnover | 34% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of July 31, 2024) KEY FACTS Fund Size $ Number of Holdings 42 Total Advisory Fee $ Portfolio Turnover 34 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 38.2 Residential REITs 17.3 Industrial REITs 15.0 Retail REITs 12.8 Health Care REITs 8.2 Real Estate Management & Development 6.1 Hotel & Resort REITs 1.4 Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Prologis Inc 11.0 American Tower Corp 9.0 Equinix Inc 6.7 Ventas Inc 5.6 Public Storage Operating Co 5.4 Kimco Realty Corp 4.1 CBRE Group Inc Class A 4.0 NNN REIT Inc 3.6 Digital Realty Trust Inc 3.5 CubeSmart 3.4 56.3 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B74"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B75"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B76"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Advisor International Real Estate Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® International Real Estate Fund |
| Class Name | Fidelity Advisor® International Real Estate Fund Class C |
| Trading Symbol | FIRCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $ 1.95 % |
| Expenses Paid, Amount | $ 195 |
| Expense Ratio, Percent | 1.95% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B93"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE July 31, 2014 through July 31, 2024. Initial investment of $10,000. Class C $10,000 $10,097 $10,191 $11,077 $11,929 $12,593 $12,701 $16,185 $13,531 $11,994 $12,038 FTSE® EPRA℠/NAREIT® Developed ex North America Index $10,000 $9,831 $10,363 $10,710 $11,550 $12,008 $10,537 $13,594 $11,122 $10,055 $10,502 MSCI EAFE Index $10,000 $9,986 $9,252 $10,918 $11,642 $11,365 $11,197 $14,617 $12,552 $14,692 $16,376 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Class C (incl. contingent deferred sales charge) -1.41% -1.20% 1.87% Class C -0.42% -1.20% 1.87% FTSE® EPRA℠/NAREIT® Developed ex North America Index 4.45% -2.64% 0.49% MSCI EAFE Index 11.46% 7.58% 5.06% Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 485,725,289 |
| Holdings Count | shares | 77 |
| Advisory Fees Paid, Amount | $ 3,520,499 |
| Investment Company Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of July 31, 2024) KEY FACTS Fund Size $ Number of Holdings 77 Total Advisory Fee $ Portfolio Turnover 84 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 34.6 Industrial REITs 15.7 Residential REITs 11.9 Specialized REITs 11.6 Health Care REITs 5.6 Retail REITs 3.6 Household Durables 2.9 Office REITs 2.0 Diversified REITs 1.5 Others 5.2 Common Stocks 94.6 Short-Term Investments and Net Other Assets (Liabilities) 5.4 ASSET ALLOCATION (% of Fund's net assets) Japan 22.6 United Kingdom 13.5 Australia 12.6 United States 11.3 Singapore 8.4 Hong Kong 6.2 Sweden 5.4 France 4.8 Spain 4.1 Others 11.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Wing Tai Holdings Ltd 4.6 Prologis Inc 4.2 Nomura Real Estate Holdings Inc 3.7 National Storage REIT unit 3.5 Segro PLC 3.2 Advance Residence Investment Corp 2.9 Daiwa Securities Living Investment Corporation 2.9 Ingenia Communities Group unit 2.8 Arena REIT unit 2.7 CK Asset Holdings Ltd 2.6 33.1 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-877-208-0098</span>" id="sjs-B108"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B109"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B110"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity International Real Estate Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® International Real Estate Fund |
| Class Name | Fidelity® International Real Estate Fund |
| Trading Symbol | FIREX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® International Real Estate Fund $ 0.94 % |
| Expenses Paid, Amount | $ 95 |
| Expense Ratio, Percent | 0.94% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B127"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE July 31, 2014 through July 31, 2024. Initial investment of $10,000. Fidelity® International Real Estate Fund $10,000 $10,195 $10,392 $11,404 $12,412 $13,218 $13,480 $17,367 $14,675 $13,033 $13,112 FTSE® EPRA℠/NAREIT® Developed ex North America Index $10,000 $9,831 $10,363 $10,710 $11,550 $12,008 $10,537 $13,594 $11,122 $10,055 $10,502 MSCI EAFE Index $10,000 $9,986 $9,252 $10,918 $11,642 $11,365 $11,197 $14,617 $12,552 $14,692 $16,376 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® International Real Estate Fund 0.60% -0.16% 2.75% FTSE® EPRA℠/NAREIT® Developed ex North America Index 4.45% -2.64% 0.49% MSCI EAFE Index 11.46% 7.58% 5.06% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 485,725,289 |
| Holdings Count | shares | 77 |
| Advisory Fees Paid, Amount | $ 3,520,499 |
| Investment Company Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of July 31, 2024) KEY FACTS Fund Size $ Number of Holdings 77 Total Advisory Fee $ Portfolio Turnover 84 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 34.6 Industrial REITs 15.7 Residential REITs 11.9 Specialized REITs 11.6 Health Care REITs 5.6 Retail REITs 3.6 Household Durables 2.9 Office REITs 2.0 Diversified REITs 1.5 Others 5.2 Common Stocks 94.6 Short-Term Investments and Net Other Assets (Liabilities) 5.4 ASSET ALLOCATION (% of Fund's net assets) Japan 22.6 United Kingdom 13.5 Australia 12.6 United States 11.3 Singapore 8.4 Hong Kong 6.2 Sweden 5.4 France 4.8 Spain 4.1 Others 11.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Wing Tai Holdings Ltd 4.6 Prologis Inc 4.2 Nomura Real Estate Holdings Inc 3.7 National Storage REIT unit 3.5 Segro PLC 3.2 Advance Residence Investment Corp 2.9 Daiwa Securities Living Investment Corporation 2.9 Ingenia Communities Group unit 2.8 Arena REIT unit 2.7 CK Asset Holdings Ltd 2.6 33.1 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B142"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B143"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B144"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Advisor International Real Estate Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® International Real Estate Fund |
| Class Name | Fidelity Advisor® International Real Estate Fund Class I |
| Trading Symbol | FIRIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $ 0.91 % |
| Expenses Paid, Amount | $ 91 |
| Expense Ratio, Percent | 0.91% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B161"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE July 31, 2014 through July 31, 2024. Initial investment of $10,000. Class I $10,000 $10,201 $10,421 $11,451 $12,468 $13,292 $13,569 $17,482 $14,780 $13,132 $13,216 FTSE® EPRA℠/NAREIT® Developed ex North America Index $10,000 $9,831 $10,363 $10,710 $11,550 $12,008 $10,537 $13,594 $11,122 $10,055 $10,502 MSCI EAFE Index $10,000 $9,986 $9,252 $10,918 $11,642 $11,365 $11,197 $14,617 $12,552 $14,692 $16,376 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Class I 0.64% -0.11% 2.83% FTSE® EPRA℠/NAREIT® Developed ex North America Index 4.45% -2.64% 0.49% MSCI EAFE Index 11.46% 7.58% 5.06% Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 485,725,289 |
| Holdings Count | shares | 77 |
| Advisory Fees Paid, Amount | $ 3,520,499 |
| Investment Company Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of July 31, 2024) KEY FACTS Fund Size $ Number of Holdings 77 Total Advisory Fee $ Portfolio Turnover 84 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 34.6 Industrial REITs 15.7 Residential REITs 11.9 Specialized REITs 11.6 Health Care REITs 5.6 Retail REITs 3.6 Household Durables 2.9 Office REITs 2.0 Diversified REITs 1.5 Others 5.2 Common Stocks 94.6 Short-Term Investments and Net Other Assets (Liabilities) 5.4 ASSET ALLOCATION (% of Fund's net assets) Japan 22.6 United Kingdom 13.5 Australia 12.6 United States 11.3 Singapore 8.4 Hong Kong 6.2 Sweden 5.4 France 4.8 Spain 4.1 Others 11.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Wing Tai Holdings Ltd 4.6 Prologis Inc 4.2 Nomura Real Estate Holdings Inc 3.7 National Storage REIT unit 3.5 Segro PLC 3.2 Advance Residence Investment Corp 2.9 Daiwa Securities Living Investment Corporation 2.9 Ingenia Communities Group unit 2.8 Arena REIT unit 2.7 CK Asset Holdings Ltd 2.6 33.1 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-877-208-0098</span>" id="sjs-B176"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B177"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B178"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Advisor International Real Estate Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® International Real Estate Fund |
| Class Name | Fidelity Advisor® International Real Estate Fund Class Z |
| Trading Symbol | FIKLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $ 0.79 % |
| Expenses Paid, Amount | $ 79 |
| Expense Ratio, Percent | 0.79% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B195"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE October 2, 2018 through July 31, 2024. Initial investment of $10,000. Class Z $10,000 $10,977 $11,210 $14,459 $12,239 $10,892 $10,977 FTSE® EPRA℠/NAREIT® Developed ex North America Index $10,000 $10,809 $9,486 $12,237 $10,013 $9,052 $9,454 MSCI EAFE Index $10,000 $9,930 $9,782 $12,771 $10,966 $12,836 $14,307 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Class Z 0.78% 0.00% 1.61% FTSE® EPRA℠/NAREIT® Developed ex North America Index 4.45% -2.64% -0.96% MSCI EAFE Index 11.46% 7.58% 6.33% A From October 2, 2018 Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Performance Inception Date | Oct. 02, 2018 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 485,725,289 |
| Holdings Count | shares | 77 |
| Advisory Fees Paid, Amount | $ 3,520,499 |
| Investment Company Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of July 31, 2024) KEY FACTS Fund Size $ Number of Holdings 77 Total Advisory Fee $ Portfolio Turnover 84 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 34.6 Industrial REITs 15.7 Residential REITs 11.9 Specialized REITs 11.6 Health Care REITs 5.6 Retail REITs 3.6 Household Durables 2.9 Office REITs 2.0 Diversified REITs 1.5 Others 5.2 Common Stocks 94.6 Short-Term Investments and Net Other Assets (Liabilities) 5.4 ASSET ALLOCATION (% of Fund's net assets) Japan 22.6 United Kingdom 13.5 Australia 12.6 United States 11.3 Singapore 8.4 Hong Kong 6.2 Sweden 5.4 France 4.8 Spain 4.1 Others 11.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Wing Tai Holdings Ltd 4.6 Prologis Inc 4.2 Nomura Real Estate Holdings Inc 3.7 National Storage REIT unit 3.5 Segro PLC 3.2 Advance Residence Investment Corp 2.9 Daiwa Securities Living Investment Corporation 2.9 Ingenia Communities Group unit 2.8 Arena REIT unit 2.7 CK Asset Holdings Ltd 2.6 33.1 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-877-208-0098</span>" id="sjs-B211"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B212"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B213"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Advisor International Real Estate Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® International Real Estate Fund |
| Class Name | Fidelity Advisor® International Real Estate Fund Class M |
| Trading Symbol | FIRTX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® International Real Estate Fund for the period August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class M $ 1.45 % |
| Expenses Paid, Amount | $ 145 |
| Expense Ratio, Percent | 1.45% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B230"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE July 31, 2014 through July 31, 2024. Initial investment of $10,000 and the current sales charge was paid. Class M $9,650 $9,794 $9,934 $10,835 $11,722 $12,409 $12,584 $16,118 $13,538 $11,968 $11,985 FTSE® EPRA℠/NAREIT® Developed ex North America Index $10,000 $9,831 $10,363 $10,710 $11,550 $12,008 $10,537 $13,594 $11,122 $10,055 $10,502 MSCI EAFE Index $10,000 $9,986 $9,252 $10,918 $11,642 $11,365 $11,197 $14,617 $12,552 $14,692 $16,376 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Class M (incl. 3.50% sales charge) -3.36% -1.40% 1.83% Class M (without 3.50% sales charge) 0.15% -0.69% 2.19% FTSE® EPRA℠/NAREIT® Developed ex North America Index 4.45% -2.64% 0.49% MSCI EAFE Index 11.46% 7.58% 5.06% Visit institutional.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 485,725,289 |
| Holdings Count | shares | 77 |
| Advisory Fees Paid, Amount | $ 3,520,499 |
| Investment Company Portfolio Turnover | 84% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of July 31, 2024) KEY FACTS Fund Size $ Number of Holdings 77 Total Advisory Fee $ Portfolio Turnover 84 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Real Estate Management & Development 34.6 Industrial REITs 15.7 Residential REITs 11.9 Specialized REITs 11.6 Health Care REITs 5.6 Retail REITs 3.6 Household Durables 2.9 Office REITs 2.0 Diversified REITs 1.5 Others 5.2 Common Stocks 94.6 Short-Term Investments and Net Other Assets (Liabilities) 5.4 ASSET ALLOCATION (% of Fund's net assets) Japan 22.6 United Kingdom 13.5 Australia 12.6 United States 11.3 Singapore 8.4 Hong Kong 6.2 Sweden 5.4 France 4.8 Spain 4.1 Others 11.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Wing Tai Holdings Ltd 4.6 Prologis Inc 4.2 Nomura Real Estate Holdings Inc 3.7 National Storage REIT unit 3.5 Segro PLC 3.2 Advance Residence Investment Corp 2.9 Daiwa Securities Living Investment Corporation 2.9 Ingenia Communities Group unit 2.8 Arena REIT unit 2.7 CK Asset Holdings Ltd 2.6 33.1 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since August 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by September 28, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-877-208-0098 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-877-208-0098</span>" id="sjs-B245"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-877-208-0098</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B246"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B247"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 84 Months Ended | 120 Months Ended | 132 Months Ended | ||||||||||
| Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014 | |
| C000121125_1_BBIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 11.46% | ||||||||||||||
| C000121125_1_BBIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 7.58% | ||||||||||||||
| C000121125_1_BBIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.06% | ||||||||||||||
| C000121124_1_BBIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 22.15% | ||||||||||||||
| C000121124_1_BBIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 15% | ||||||||||||||
| C000121124_1_BBIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 13.15% | ||||||||||||||
| C000121127_1_BBIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 11.46% | ||||||||||||||
| C000121127_1_BBIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 7.58% | ||||||||||||||
| C000121127_1_BBIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.06% | ||||||||||||||
| C000121129_1_BBIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 11.46% | ||||||||||||||
| C000121129_1_BBIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 7.58% | ||||||||||||||
| C000121129_1_BBIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.06% | ||||||||||||||
| C000121130_1_BBIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 11.46% | ||||||||||||||
| C000121130_1_BBIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 7.58% | ||||||||||||||
| C000121130_1_BBIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.06% | ||||||||||||||
| C000205046_1_BBIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 11.46% | ||||||||||||||
| C000205046_1_BBIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 7.58% | ||||||||||||||
| C000205046_1_BBIndexMember_LOCMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 6.33% | ||||||||||||||
| C000121128_1_BBIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 11.46% | ||||||||||||||
| C000121128_1_BBIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 7.58% | ||||||||||||||
| C000121128_1_BBIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 5.06% | ||||||||||||||
| C000121125_LG_ClassMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class A</span>" id="sjs-F68"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class A</span> | ||||||||||||||
| C000121125_ClassMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 9,425 | ||||||||||||||
| C000121125_ClassMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 9,582 | ||||||||||||||
| C000121125_ClassMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 9,750 | ||||||||||||||
| C000121125_ClassMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 10,675 | ||||||||||||||
| C000121125_ClassMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 11,581 | ||||||||||||||
| C000121125_ClassMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,300 | ||||||||||||||
| C000121125_ClassMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,511 | ||||||||||||||
| C000121125_ClassMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 16,071 | ||||||||||||||
| C000121125_ClassMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 13,539 | ||||||||||||||
| C000121125_ClassMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,002 | ||||||||||||||
| C000121125_ClassMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,046 | $ 12,046 | $ 12,046 | $ 12,046 | $ 12,046 | ||||||||||
| C000121125_LG_1_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | FTSE® EPRA℠/NAREIT® Developed ex North America Index</span>" id="sjs-F104"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">FTSE® EPRA℠/NAREIT® Developed ex North America Index</span> | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,831 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,363 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,710 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,550 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,008 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,537 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,594 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,122 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,055 | ||||||||||||||
| C000121125_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,502 | 10,502 | 10,502 | 10,502 | $ 10,502 | ||||||||||
| C000121125_LG_2_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE Index</span>" id="sjs-F140"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI EAFE Index</span> | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,986 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,252 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,918 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,642 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,365 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,197 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,617 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,552 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,692 | ||||||||||||||
| C000121125_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 16,376 | $ 16,376 | 16,376 | $ 16,376 | $ 16,376 | ||||||||||
| C000121125_ClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (5.40%) | ||||||||||||||
| C000121125_ClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (1.59%) | ||||||||||||||
| C000121125_ClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 1.88% | ||||||||||||||
| C000121125_NoLoadClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.37% | ||||||||||||||
| C000121125_NoLoadClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (0.42%) | ||||||||||||||
| C000121125_NoLoadClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 2.48% | ||||||||||||||
| C000121125_0_AdditionalIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.45% | ||||||||||||||
| C000121125_0_AdditionalIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (2.64%) | ||||||||||||||
| C000121125_0_AdditionalIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.49% | ||||||||||||||
| C000121124_LG_ClassMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Fidelity® Real Estate Investment Portfolio</span>" id="sjs-F203"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Real Estate Investment Portfolio</span> | ||||||||||||||
| C000121124_ClassMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121124_ClassMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,034 | ||||||||||||||
| C000121124_ClassMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,682 | ||||||||||||||
| C000121124_ClassMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,006 | ||||||||||||||
| C000121124_ClassMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,413 | ||||||||||||||
| C000121124_ClassMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 15,062 | ||||||||||||||
| C000121124_ClassMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,136 | ||||||||||||||
| C000121124_ClassMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 18,584 | ||||||||||||||
| C000121124_ClassMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 18,171 | ||||||||||||||
| C000121124_ClassMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 16,467 | ||||||||||||||
| C000121124_ClassMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 18,160 | $ 18,160 | 18,160 | $ 18,160 | $ 18,160 | ||||||||||
| C000121124_LG_1_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI US IMI Real Estate 25/50 Linked Index</span>" id="sjs-F239"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI US IMI Real Estate 25/50 Linked Index</span> | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,129 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,457 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,695 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,185 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,621 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,238 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 16,556 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 15,854 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,323 | ||||||||||||||
| C000121124_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 15,860 | 15,860 | 15,860 | 15,860 | $ 15,860 | ||||||||||
| C000121124_LG_2_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index</span>" id="sjs-F275"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span> | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,121 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,745 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,629 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 15,843 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 17,108 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 19,153 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 26,134 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 24,921 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 28,165 | ||||||||||||||
| C000121124_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 34,403 | $ 34,403 | 34,403 | $ 34,403 | $ 34,403 | ||||||||||
| C000121124_NoLoadClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 10.28% | ||||||||||||||
| C000121124_NoLoadClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 3.81% | ||||||||||||||
| C000121124_NoLoadClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 6.15% | ||||||||||||||
| C000121124_0_AdditionalIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 10.73% | ||||||||||||||
| C000121124_0_AdditionalIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 1.64% | ||||||||||||||
| C000121124_0_AdditionalIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.72% | ||||||||||||||
| C000121127_LG_ClassMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class C</span>" id="sjs-F329"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class C</span> | ||||||||||||||
| C000121127_ClassMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121127_ClassMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,097 | ||||||||||||||
| C000121127_ClassMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,191 | ||||||||||||||
| C000121127_ClassMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,077 | ||||||||||||||
| C000121127_ClassMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,929 | ||||||||||||||
| C000121127_ClassMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,593 | ||||||||||||||
| C000121127_ClassMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,701 | ||||||||||||||
| C000121127_ClassMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 16,185 | ||||||||||||||
| C000121127_ClassMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,531 | ||||||||||||||
| C000121127_ClassMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,994 | ||||||||||||||
| C000121127_ClassMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,038 | $ 12,038 | 12,038 | $ 12,038 | $ 12,038 | ||||||||||
| C000121127_LG_1_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | FTSE® EPRA℠/NAREIT® Developed ex North America Index</span>" id="sjs-F365"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">FTSE® EPRA℠/NAREIT® Developed ex North America Index</span> | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,831 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,363 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,710 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,550 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,008 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,537 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,594 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,122 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,055 | ||||||||||||||
| C000121127_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,502 | 10,502 | 10,502 | 10,502 | $ 10,502 | ||||||||||
| C000121127_LG_2_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE Index</span>" id="sjs-F401"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI EAFE Index</span> | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,986 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,252 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,918 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,642 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,365 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,197 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,617 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,552 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,692 | ||||||||||||||
| C000121127_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 16,376 | $ 16,376 | 16,376 | $ 16,376 | $ 16,376 | ||||||||||
| C000121127_ClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (1.41%) | ||||||||||||||
| C000121127_ClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (1.20%) | ||||||||||||||
| C000121127_ClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 1.87% | ||||||||||||||
| C000121127_NoLoadClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (0.42%) | ||||||||||||||
| C000121127_NoLoadClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (1.20%) | ||||||||||||||
| C000121127_NoLoadClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 1.87% | ||||||||||||||
| C000121127_0_AdditionalIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.45% | ||||||||||||||
| C000121127_0_AdditionalIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (2.64%) | ||||||||||||||
| C000121127_0_AdditionalIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.49% | ||||||||||||||
| C000121129_LG_ClassMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Fidelity® International Real Estate Fund</span>" id="sjs-F464"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® International Real Estate Fund</span> | ||||||||||||||
| C000121129_ClassMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121129_ClassMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,195 | ||||||||||||||
| C000121129_ClassMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,392 | ||||||||||||||
| C000121129_ClassMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,404 | ||||||||||||||
| C000121129_ClassMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,412 | ||||||||||||||
| C000121129_ClassMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,218 | ||||||||||||||
| C000121129_ClassMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,480 | ||||||||||||||
| C000121129_ClassMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 17,367 | ||||||||||||||
| C000121129_ClassMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,675 | ||||||||||||||
| C000121129_ClassMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,033 | ||||||||||||||
| C000121129_ClassMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 13,112 | $ 13,112 | 13,112 | $ 13,112 | $ 13,112 | ||||||||||
| C000121129_LG_1_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | FTSE® EPRA℠/NAREIT® Developed ex North America Index</span>" id="sjs-F500"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">FTSE® EPRA℠/NAREIT® Developed ex North America Index</span> | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,831 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,363 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,710 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,550 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,008 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,537 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,594 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,122 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,055 | ||||||||||||||
| C000121129_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,502 | 10,502 | 10,502 | 10,502 | $ 10,502 | ||||||||||
| C000121129_LG_2_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE Index</span>" id="sjs-F536"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI EAFE Index</span> | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,986 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,252 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,918 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,642 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,365 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,197 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,617 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,552 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,692 | ||||||||||||||
| C000121129_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 16,376 | $ 16,376 | 16,376 | $ 16,376 | $ 16,376 | ||||||||||
| C000121129_NoLoadClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.60% | ||||||||||||||
| C000121129_NoLoadClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (0.16%) | ||||||||||||||
| C000121129_NoLoadClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 2.75% | ||||||||||||||
| C000121129_0_AdditionalIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.45% | ||||||||||||||
| C000121129_0_AdditionalIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (2.64%) | ||||||||||||||
| C000121129_0_AdditionalIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.49% | ||||||||||||||
| C000121130_LG_ClassMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class I</span>" id="sjs-F590"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class I</span> | ||||||||||||||
| C000121130_ClassMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121130_ClassMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,201 | ||||||||||||||
| C000121130_ClassMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,421 | ||||||||||||||
| C000121130_ClassMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,451 | ||||||||||||||
| C000121130_ClassMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,468 | ||||||||||||||
| C000121130_ClassMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,292 | ||||||||||||||
| C000121130_ClassMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,569 | ||||||||||||||
| C000121130_ClassMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 17,482 | ||||||||||||||
| C000121130_ClassMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,780 | ||||||||||||||
| C000121130_ClassMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,132 | ||||||||||||||
| C000121130_ClassMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 13,216 | $ 13,216 | 13,216 | $ 13,216 | $ 13,216 | ||||||||||
| C000121130_LG_1_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | FTSE® EPRA℠/NAREIT® Developed ex North America Index</span>" id="sjs-F626"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">FTSE® EPRA℠/NAREIT® Developed ex North America Index</span> | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,831 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,363 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,710 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,550 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,008 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,537 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,594 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,122 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,055 | ||||||||||||||
| C000121130_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,502 | 10,502 | 10,502 | 10,502 | $ 10,502 | ||||||||||
| C000121130_LG_2_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE Index</span>" id="sjs-F662"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI EAFE Index</span> | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,986 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,252 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,918 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,642 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,365 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,197 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,617 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,552 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,692 | ||||||||||||||
| C000121130_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 16,376 | $ 16,376 | $ 16,376 | $ 16,376 | $ 16,376 | ||||||||||
| C000121130_NoLoadClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.64% | ||||||||||||||
| C000121130_NoLoadClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (0.11%) | ||||||||||||||
| C000121130_NoLoadClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 2.83% | ||||||||||||||
| C000121130_0_AdditionalIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.45% | ||||||||||||||
| C000121130_0_AdditionalIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (2.64%) | ||||||||||||||
| C000121130_0_AdditionalIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.49% | ||||||||||||||
| C000205046_LG_ClassMember_7YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class Z</span>" id="sjs-D716"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class Z</span> | ||||||||||||||
| C000205046_ClassMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000205046_ClassMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,977 | ||||||||||||||
| C000205046_ClassMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,210 | ||||||||||||||
| C000205046_ClassMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 14,459 | ||||||||||||||
| C000205046_ClassMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,239 | ||||||||||||||
| C000205046_ClassMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,892 | ||||||||||||||
| C000205046_ClassMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 10,977 | $ 10,977 | $ 10,977 | $ 10,977 | 10,977 | ||||||||||
| C000205046_LG_1_AdditionalIndexMember_7YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | FTSE® EPRA℠/NAREIT® Developed ex North America Index</span>" id="sjs-D740"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">FTSE® EPRA℠/NAREIT® Developed ex North America Index</span> | ||||||||||||||
| C000205046_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000205046_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,809 | ||||||||||||||
| C000205046_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,486 | ||||||||||||||
| C000205046_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,237 | ||||||||||||||
| C000205046_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,013 | ||||||||||||||
| C000205046_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,052 | ||||||||||||||
| C000205046_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,454 | 9,454 | $ 9,454 | 9,454 | 9,454 | ||||||||||
| C000205046_LG_2_AdditionalIndexMember_7YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE Index</span>" id="sjs-D764"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI EAFE Index</span> | ||||||||||||||
| C000205046_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000205046_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,930 | ||||||||||||||
| C000205046_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,782 | ||||||||||||||
| C000205046_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,771 | ||||||||||||||
| C000205046_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,966 | ||||||||||||||
| C000205046_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,836 | ||||||||||||||
| C000205046_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 14,307 | $ 14,307 | $ 14,307 | 14,307 | $ 14,307 | ||||||||||
| C000205046_NoLoadClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.78% | ||||||||||||||
| C000205046_NoLoadClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0% | ||||||||||||||
| C000205046_NoLoadClassMember_2023-08-01_2024-07-31Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 1.61% | ||||||||||||||
| C000205046_0_AdditionalIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.45% | ||||||||||||||
| C000205046_0_AdditionalIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (2.64%) | ||||||||||||||
| C000205046_0_AdditionalIndexMember_LOCMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (0.96%) | ||||||||||||||
| C000121128_LG_ClassMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | Class M</span>" id="sjs-F806"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Class M</span> | ||||||||||||||
| C000121128_ClassMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,650 | ||||||||||||||
| C000121128_ClassMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,794 | ||||||||||||||
| C000121128_ClassMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,934 | ||||||||||||||
| C000121128_ClassMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,835 | ||||||||||||||
| C000121128_ClassMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,722 | ||||||||||||||
| C000121128_ClassMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,409 | ||||||||||||||
| C000121128_ClassMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,584 | ||||||||||||||
| C000121128_ClassMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 16,118 | ||||||||||||||
| C000121128_ClassMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,538 | ||||||||||||||
| C000121128_ClassMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,968 | ||||||||||||||
| C000121128_ClassMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 11,985 | $ 11,985 | 11,985 | 11,985 | $ 11,985 | ||||||||||
| C000121128_LG_1_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | FTSE® EPRA℠/NAREIT® Developed ex North America Index</span>" id="sjs-F842"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">FTSE® EPRA℠/NAREIT® Developed ex North America Index</span> | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,000 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 9,831 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,363 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,710 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,550 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 12,008 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,537 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 13,594 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 11,122 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,055 | ||||||||||||||
| C000121128_1_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | 10,502 | 10,502 | 10,502 | 10,502 | $ 10,502 | ||||||||||
| C000121128_LG_2_AdditionalIndexMember_11YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Line Graph and Table Measure Name | MSCI EAFE Index</span>" id="sjs-F878"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI EAFE Index</span> | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2014Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 10,000 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2015Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 9,986 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2016Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 9,252 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2017Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 10,918 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2018Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 11,642 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2019Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 11,365 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2020Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 11,197 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2021Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 14,617 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2022Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 12,552 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2023Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 14,692 | ||||||||||||||
| C000121128_2_AdditionalIndexMember_AsOf_2024Member | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Account Value | $ 16,376 | $ 16,376 | $ 16,376 | $ 16,376 | $ 16,376 | ||||||||||
| C000121128_ClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (3.36%) | ||||||||||||||
| C000121128_ClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (1.40%) | ||||||||||||||
| C000121128_ClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 1.83% | ||||||||||||||
| C000121128_NoLoadClassMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.15% | ||||||||||||||
| C000121128_NoLoadClassMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (0.69%) | ||||||||||||||
| C000121128_NoLoadClassMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 2.19% | ||||||||||||||
| C000121128_0_AdditionalIndexMember_1YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 4.45% | ||||||||||||||
| C000121128_0_AdditionalIndexMember_5YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | (2.64%) | ||||||||||||||
| C000121128_0_AdditionalIndexMember_10YRMember | |||||||||||||||
| Account Value [Line Items] | |||||||||||||||
| Average Annual Return, Percent | 0.49% |
| Shareholder Report, Holdings (Details) | Jul. 31, 2024 |
| Fidelity Advisor International Real Estate Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor International Real Estate Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor International Real Estate Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Advisor International Real Estate Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor International Real Estate Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Advisor International Real Estate Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor International Real Estate Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor International Real Estate Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor International Real Estate Fund - Class A | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.60% |
| Fidelity Advisor International Real Estate Fund - Class A | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Advisor International Real Estate Fund - Class A | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| Fidelity Advisor International Real Estate Fund - Class A | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor International Real Estate Fund - Class A | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Advisor International Real Estate Fund - Class A | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor International Real Estate Fund - Class A | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class A | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor International Real Estate Fund - Class A | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor International Real Estate Fund - Class A | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Advisor International Real Estate Fund - Class A | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor International Real Estate Fund - Class A | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.50% |
| Fidelity Advisor International Real Estate Fund - Class A | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity Advisor International Real Estate Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Fidelity Advisor International Real Estate Fund - Class A | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor International Real Estate Fund - Class A | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor International Real Estate Fund - Class A | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class A | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor International Real Estate Fund - Class A | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor International Real Estate Fund - Class A | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Advisor International Real Estate Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.60% |
| Fidelity Advisor International Real Estate Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Real Estate Investment Portfolio | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Real Estate Investment Portfolio | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Real Estate Investment Portfolio | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Fidelity Real Estate Investment Portfolio | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Real Estate Investment Portfolio | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Real Estate Investment Portfolio | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Real Estate Investment Portfolio | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Real Estate Investment Portfolio | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Real Estate Investment Portfolio | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Real Estate Investment Portfolio | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Real Estate Investment Portfolio | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.20% |
| Fidelity Real Estate Investment Portfolio | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.30% |
| Fidelity Real Estate Investment Portfolio | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15% |
| Fidelity Real Estate Investment Portfolio | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| Fidelity Real Estate Investment Portfolio | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Real Estate Investment Portfolio | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Real Estate Investment Portfolio | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Real Estate Investment Portfolio | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| Fidelity Real Estate Investment Portfolio | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99% |
| Fidelity Real Estate Investment Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor International Real Estate Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor International Real Estate Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor International Real Estate Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Advisor International Real Estate Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor International Real Estate Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Advisor International Real Estate Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor International Real Estate Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor International Real Estate Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor International Real Estate Fund - Class C | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.60% |
| Fidelity Advisor International Real Estate Fund - Class C | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Advisor International Real Estate Fund - Class C | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| Fidelity Advisor International Real Estate Fund - Class C | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor International Real Estate Fund - Class C | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Advisor International Real Estate Fund - Class C | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor International Real Estate Fund - Class C | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class C | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor International Real Estate Fund - Class C | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor International Real Estate Fund - Class C | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Advisor International Real Estate Fund - Class C | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor International Real Estate Fund - Class C | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.50% |
| Fidelity Advisor International Real Estate Fund - Class C | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity Advisor International Real Estate Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Fidelity Advisor International Real Estate Fund - Class C | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor International Real Estate Fund - Class C | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor International Real Estate Fund - Class C | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class C | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor International Real Estate Fund - Class C | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor International Real Estate Fund - Class C | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Advisor International Real Estate Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.60% |
| Fidelity Advisor International Real Estate Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity International Real Estate Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity International Real Estate Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity International Real Estate Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity International Real Estate Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity International Real Estate Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity International Real Estate Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity International Real Estate Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity International Real Estate Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity International Real Estate Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity International Real Estate Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity International Real Estate Fund | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.60% |
| Fidelity International Real Estate Fund | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity International Real Estate Fund | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| Fidelity International Real Estate Fund | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity International Real Estate Fund | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity International Real Estate Fund | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity International Real Estate Fund | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity International Real Estate Fund | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity International Real Estate Fund | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity International Real Estate Fund | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity International Real Estate Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity International Real Estate Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.50% |
| Fidelity International Real Estate Fund | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity International Real Estate Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Fidelity International Real Estate Fund | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity International Real Estate Fund | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity International Real Estate Fund | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity International Real Estate Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity International Real Estate Fund | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity International Real Estate Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity International Real Estate Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.60% |
| Fidelity International Real Estate Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor International Real Estate Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor International Real Estate Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Advisor International Real Estate Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor International Real Estate Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Advisor International Real Estate Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor International Real Estate Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor International Real Estate Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor International Real Estate Fund - Class I | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.60% |
| Fidelity Advisor International Real Estate Fund - Class I | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Advisor International Real Estate Fund - Class I | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| Fidelity Advisor International Real Estate Fund - Class I | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor International Real Estate Fund - Class I | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Advisor International Real Estate Fund - Class I | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor International Real Estate Fund - Class I | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class I | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor International Real Estate Fund - Class I | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor International Real Estate Fund - Class I | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Advisor International Real Estate Fund - Class I | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor International Real Estate Fund - Class I | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.50% |
| Fidelity Advisor International Real Estate Fund - Class I | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity Advisor International Real Estate Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Fidelity Advisor International Real Estate Fund - Class I | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor International Real Estate Fund - Class I | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor International Real Estate Fund - Class I | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class I | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor International Real Estate Fund - Class I | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor International Real Estate Fund - Class I | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Advisor International Real Estate Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.60% |
| Fidelity Advisor International Real Estate Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor International Real Estate Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor International Real Estate Fund - Class Z | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Advisor International Real Estate Fund - Class Z | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.50% |
| Fidelity Advisor International Real Estate Fund - Class Z | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Fidelity Advisor International Real Estate Fund - Class Z | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor International Real Estate Fund - Class Z | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor International Real Estate Fund - Class Z | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class Z | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor International Real Estate Fund - Class Z | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor International Real Estate Fund - Class Z | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Advisor International Real Estate Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.60% |
| Fidelity Advisor International Real Estate Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor International Real Estate Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Advisor International Real Estate Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Advisor International Real Estate Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor International Real Estate Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Advisor International Real Estate Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor International Real Estate Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Advisor International Real Estate Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor International Real Estate Fund - Class M | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.60% |
| Fidelity Advisor International Real Estate Fund - Class M | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Advisor International Real Estate Fund - Class M | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| Fidelity Advisor International Real Estate Fund - Class M | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Advisor International Real Estate Fund - Class M | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Advisor International Real Estate Fund - Class M | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor International Real Estate Fund - Class M | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor International Real Estate Fund - Class M | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor International Real Estate Fund - Class M | TI8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor International Real Estate Fund - Class M | TI9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Advisor International Real Estate Fund - Class M | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.60% |
| Fidelity Advisor International Real Estate Fund - Class M | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.50% |
| Fidelity Advisor International Real Estate Fund - Class M | Australia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity Advisor International Real Estate Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Fidelity Advisor International Real Estate Fund - Class M | Singapore | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor International Real Estate Fund - Class M | Hong Kong | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor International Real Estate Fund - Class M | Sweden | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor International Real Estate Fund - Class M | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor International Real Estate Fund - Class M | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor International Real Estate Fund - Class M | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Advisor International Real Estate Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.60% |
| Fidelity Advisor International Real Estate Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
