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Shareholder Report
 6 Months Ended
Jul. 31, 2024
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Salem Street Trust
Entity Central Index Key 0000035315
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2024
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® SAI Sustainable Conservative Income Municipal Bond Fund
Class Name Fidelity® SAI Sustainable Conservative Income Municipal Bond Fund
Trading Symbol FASYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® SAI Sustainable Conservative Income Municipal Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-3455
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® SAI Sustainable Conservative Income Municipal Bond Fund 
$ 10 
0.20%
  
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20%
Net Assets $ 16,369,527
Holdings Count | shares 107
Investment Company Portfolio Turnover 68.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$16,369,527
 
  
Number of Holdings
107
 
  
Portfolio Turnover
68%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Synthetics 18.4   Electric Utilities 15.7   Health Care 15.4   General Obligations 13.6   Housing 9.5   Resource Recovery 9.5   Education 5.3   Others(Individually Less Than 5%) 12.6   100.0       AAA 9.5 AA 24.0 A 43.3 BBB 16.9 Not Rated 6.9 QUALITY DIVERSIFICATION (% of Fund's net assets) Short-Term Investments and Net Other Assets (Liabilities) - (0.6)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 11.9 Alabama 10.9 Texas 6.5 Georgia 6.3 Pennsylvania 5.9      
Fidelity Series Large Cap Value Index Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Series Large Cap Value Index Fund
Class Name Fidelity® Series Large Cap Value Index Fund
Trading Symbol FIOOX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Series Large Cap Value Index Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544.
Additional Information Phone Number 1-800-544-8544
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Series Large Cap Value Index Fund 
$ 0 A
0.00%B
  
A Amount represents less than $.50
B Amount represents less than 0.005%
 
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Net Assets $ 7,470,689,468
Holdings Count | shares 877
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$7,470,689,468
 
  
Number of Holdings
877
 
  
Portfolio Turnover
42%
 
  
Holdings [Text Block]   MARKET SECTORS (% of Fund's net assets)     Financials 21.3   Health Care 15.8   Industrials 14.5   Information Technology 9.0   Consumer Staples 7.7   Energy 7.4   Consumer Discretionary 6.1   Real Estate 4.7   Materials 4.6   Utilities 4.5   Communication Services 4.1     Common Stocks 99.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) United States 99.0 Ireland 0.8 Canada 0.1 United Kingdom 0.1 Bermuda 0.0 Belgium 0.0 Puerto Rico 0.0 Brazil 0.0 Luxembourg 0.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)    
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Berkshire Hathaway Inc Class B 3.3     JPMorgan Chase & Co 2.6     Exxon Mobil Corp 2.3     UnitedHealth Group Inc 2.1     Johnson & Johnson 1.7     Walmart Inc 1.3     Procter & Gamble Co/The 1.3     Chevron Corp 1.2     Bank of America Corp 1.2     Thermo Fisher Scientific Inc 1.0       18.0    
Fidelity Tax-Free Bond Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Tax-Free Bond Fund
Class Name Fidelity® Tax-Free Bond Fund
Trading Symbol FTABX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Tax-Free Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Tax-Free Bond Fund 
$ 12 
0.25%
  
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.25%
Net Assets $ 3,417,882,452
Holdings Count | shares 1,288
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$3,417,882,452
 
  
Number of Holdings
1,288
 
  
Portfolio Turnover
6%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 23.0   Health Care 22.4   Transportation 15.0   Special Tax 9.6   Education 8.9   Electric Utilities 7.0   State G.O. 6.0   Others(Individually Less Than 5%) 8.1   100.0       AAA 5.6 AA 30.5 A 47.4 BBB 9.2 BB 1.1 B 0.5 CCC,CC,C 0.0 Not Rated 4.4 Short-Term Investments and Net Other Assets (Liabilities) 1.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Illinois 13.2 New York 8.1 Texas 7.4 New Jersey 6.5 Pennsylvania 6.1      
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Sustainable Intermediate Municipal Income Fund Class A
Trading Symbol FASJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Intermediate Municipal Income Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 31 
0.62%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 15,835,114
Holdings Count | shares 249
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$15,835,114
 
  
Number of Holdings
249
 
  
Portfolio Turnover
15%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 21.2   General Obligations 21.1   Education 16.3   Electric Utilities 9.6   Housing 8.1   State G.O. 6.7   Special Tax 5.6   Others(Individually Less Than 5%) 11.4   100.0       AAA 8.9 AA 41.8 A 32.1 BBB 17.0 BB 0.3 Not Rated 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)   Short-Term Investments and Net Other Assets (Liabilities) - (0.2)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 9.1 Illinois 8.3 California 7.0 Florida 5.7 Georgia 5.6      
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Sustainable Intermediate Municipal Income Fund Class C
Trading Symbol FASNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Intermediate Municipal Income Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 68 
1.37%
  
Expenses Paid, Amount $ 68
Expense Ratio, Percent 1.37%
Net Assets $ 15,835,114
Holdings Count | shares 249
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$15,835,114
 
  
Number of Holdings
249
 
  
Portfolio Turnover
15%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 21.2   General Obligations 21.1   Education 16.3   Electric Utilities 9.6   Housing 8.1   State G.O. 6.7   Special Tax 5.6   Others(Individually Less Than 5%) 11.4   100.0       AAA 8.9 AA 41.8 A 32.1 BBB 17.0 BB 0.3 Not Rated 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)   Short-Term Investments and Net Other Assets (Liabilities) - (0.2)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 9.1 Illinois 8.3 California 7.0 Florida 5.7 Georgia 5.6      
Fidelity Advisor Municipal Core Plus Bond Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® Municipal Core Plus Bond Fund
Class Name Fidelity Advisor® Municipal Core Plus Bond Fund Class A
Trading Symbol FMBMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Municipal Core Plus Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 31 
0.62%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 59,223,606
Holdings Count | shares 315
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$59,223,606
 
  
Number of Holdings
315
 
  
Portfolio Turnover
30%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 19.7   General Obligations 16.9   Transportation 12.2   Education 11.3   Housing 7.4   State G.O. 7.0   Special Tax 6.5   Others(Individually Less Than 5%) 19.0   100.0       AAA 8.1 AA 30.2 A 30.9 BBB 20.6 BB 0.6 B 0.5 Not Rated 5.4 Short-Term Investments and Net Other Assets (Liabilities) 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Illinois 10.4 New Jersey 8.6 Florida 6.1 Alabama 5.4 Connecticut 5.3      
Fidelity Advisor Municipal Core Plus Bond Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® Municipal Core Plus Bond Fund
Class Name Fidelity Advisor® Municipal Core Plus Bond Fund Class M
Trading Symbol FMBFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Municipal Core Plus Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 31 
0.62%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 59,223,606
Holdings Count | shares 315
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$59,223,606
 
  
Number of Holdings
315
 
  
Portfolio Turnover
30%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 19.7   General Obligations 16.9   Transportation 12.2   Education 11.3   Housing 7.4   State G.O. 7.0   Special Tax 6.5   Others(Individually Less Than 5%) 19.0   100.0       AAA 8.1 AA 30.2 A 30.9 BBB 20.6 BB 0.6 B 0.5 Not Rated 5.4 Short-Term Investments and Net Other Assets (Liabilities) 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Illinois 10.4 New Jersey 8.6 Florida 6.1 Alabama 5.4 Connecticut 5.3      
Fidelity SAI Tax-Free Bond Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® SAI Tax-Free Bond Fund
Class Name Fidelity® SAI Tax-Free Bond Fund
Trading Symbol FSAJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® SAI Tax-Free Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-3455
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® SAI Tax-Free Bond Fund 
$ 12 
0.25%
  
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.25%
Net Assets $ 2,692,523,796
Holdings Count | shares 1,279
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$2,692,523,796
 
  
Number of Holdings
1,279
 
  
Portfolio Turnover
7%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 20.3   Health Care 19.6   Special Tax 12.9   Transportation 10.8   Education 10.3   Housing 9.0   State G.O. 6.7   Others(Individually Less Than 5%) 10.4   100.0       AAA 7.5 AA 35.7 A 40.4 BBB 9.5 BB 0.6 B 0.4 CCC,CC,C 0.1 Not Rated 3.6 Short-Term Investments and Net Other Assets (Liabilities) 2.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 14.3 Illinois 13.3 Texas 8.5 New Jersey 5.9 Pennsylvania 4.7      
Fidelity Sustainable Intermediate Municipal Income Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Intermediate Municipal Income Fund
Class Name Fidelity® Sustainable Intermediate Municipal Income Fund
Trading Symbol FSIKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Intermediate Municipal Income Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Sustainable Intermediate Municipal Income Fund 
$ 18 
0.37%
  
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.37%
Net Assets $ 15,835,114
Holdings Count | shares 249
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$15,835,114
 
  
Number of Holdings
249
 
  
Portfolio Turnover
15%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 21.2   General Obligations 21.1   Education 16.3   Electric Utilities 9.6   Housing 8.1   State G.O. 6.7   Special Tax 5.6   Others(Individually Less Than 5%) 11.4   100.0       AAA 8.9 AA 41.8 A 32.1 BBB 17.0 BB 0.3 Not Rated 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)   Short-Term Investments and Net Other Assets (Liabilities) - (0.2)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 9.1 Illinois 8.3 California 7.0 Florida 5.7 Georgia 5.6      
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Sustainable Intermediate Municipal Income Fund Class M
Trading Symbol FASLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Intermediate Municipal Income Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 31 
0.62%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 15,835,114
Holdings Count | shares 249
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$15,835,114
 
  
Number of Holdings
249
 
  
Portfolio Turnover
15%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 21.2   General Obligations 21.1   Education 16.3   Electric Utilities 9.6   Housing 8.1   State G.O. 6.7   Special Tax 5.6   Others(Individually Less Than 5%) 11.4   100.0       AAA 8.9 AA 41.8 A 32.1 BBB 17.0 BB 0.3 Not Rated 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)   Short-Term Investments and Net Other Assets (Liabilities) - (0.2)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 9.1 Illinois 8.3 California 7.0 Florida 5.7 Georgia 5.6      
Fidelity Advisor Municipal Core Plus Bond Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® Municipal Core Plus Bond Fund
Class Name Fidelity Advisor® Municipal Core Plus Bond Fund Class I
Trading Symbol FMBGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Municipal Core Plus Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 18 
0.37%
  
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.37%
Net Assets $ 59,223,606
Holdings Count | shares 315
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$59,223,606
 
  
Number of Holdings
315
 
  
Portfolio Turnover
30%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 19.7   General Obligations 16.9   Transportation 12.2   Education 11.3   Housing 7.4   State G.O. 7.0   Special Tax 6.5   Others(Individually Less Than 5%) 19.0   100.0       AAA 8.1 AA 30.2 A 30.9 BBB 20.6 BB 0.6 B 0.5 Not Rated 5.4 Short-Term Investments and Net Other Assets (Liabilities) 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Illinois 10.4 New Jersey 8.6 Florida 6.1 Alabama 5.4 Connecticut 5.3      
Fidelity Advisor Municipal Core Plus Bond Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® Municipal Core Plus Bond Fund
Class Name Fidelity Advisor® Municipal Core Plus Bond Fund Class Z
Trading Symbol FMBHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Municipal Core Plus Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 15 
0.31%
  
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.31%
Net Assets $ 59,223,606
Holdings Count | shares 315
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$59,223,606
 
  
Number of Holdings
315
 
  
Portfolio Turnover
30%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 19.7   General Obligations 16.9   Transportation 12.2   Education 11.3   Housing 7.4   State G.O. 7.0   Special Tax 6.5   Others(Individually Less Than 5%) 19.0   100.0       AAA 8.1 AA 30.2 A 30.9 BBB 20.6 BB 0.6 B 0.5 Not Rated 5.4 Short-Term Investments and Net Other Assets (Liabilities) 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Illinois 10.4 New Jersey 8.6 Florida 6.1 Alabama 5.4 Connecticut 5.3      
Fidelity SAI Conservative Income Municipal Bond Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® SAI Conservative Income Municipal Bond Fund
Class Name Fidelity® SAI Conservative Income Municipal Bond Fund
Trading Symbol FSMJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® SAI Conservative Income Municipal Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-3455
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® SAI Conservative Income Municipal Bond Fund 
$ 10 
0.20%
  
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20%
Net Assets $ 1,388,464,065
Holdings Count | shares 626
Investment Company Portfolio Turnover 61.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,388,464,065
 
  
Number of Holdings
626
 
  
Portfolio Turnover
61%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Synthetics 23.9   General Obligations 16.3   Resource Recovery 9.8   Transportation 8.8   Industrial Development 8.6   Health Care 8.4   Electric Utilities 8.0   Housing 5.4   Others(Individually Less Than 5%) 10.8   100.0       AAA 12.4 AA 22.4 A 40.2 BBB 17.8 Not Rated 6.3 Short-Term Investments and Net Other Assets (Liabilities) 0.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Texas 12.1 California 9.2 Florida 7.9 Pennsylvania 6.6 Arizona 6.0      
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Sustainable Intermediate Municipal Income Fund Class Z
Trading Symbol FASVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Intermediate Municipal Income Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 15 
0.31%
  
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.31%
Net Assets $ 15,835,114
Holdings Count | shares 249
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$15,835,114
 
  
Number of Holdings
249
 
  
Portfolio Turnover
15%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 21.2   General Obligations 21.1   Education 16.3   Electric Utilities 9.6   Housing 8.1   State G.O. 6.7   Special Tax 5.6   Others(Individually Less Than 5%) 11.4   100.0       AAA 8.9 AA 41.8 A 32.1 BBB 17.0 BB 0.3 Not Rated 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)   Short-Term Investments and Net Other Assets (Liabilities) - (0.2)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 9.1 Illinois 8.3 California 7.0 Florida 5.7 Georgia 5.6      
Fidelity SAI Sustainable Municipal Income Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® SAI Sustainable Municipal Income Fund
Class Name Fidelity® SAI Sustainable Municipal Income Fund
Trading Symbol FASWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® SAI Sustainable Municipal Income Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-3455
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® SAI Sustainable Municipal Income Fund 
$ 18 
0.36%
  
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.36%
Net Assets $ 26,698,208
Holdings Count | shares 280
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$26,698,208
 
  
Number of Holdings
280
 
  
Portfolio Turnover
0%A
 
  
A Amount represents less than 1%
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 31.0   Health Care 22.7   Education 15.9   Water & Sewer 9.4   Special Tax 6.4   Electric Utilities 5.0   Others(Individually Less Than 5%) 9.6   100.0       AAA 7.6 AA 50.7 A 30.1 BBB 12.1 BB 0.2 Not Rated 0.2 QUALITY DIVERSIFICATION (% of Fund's net assets)   Short-Term Investments and Net Other Assets (Liabilities) - (0.9)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) California 12.6 Florida 9.6 New York 8.5 Massachusetts 8.5 Illinois 6.7      
Fidelity Advisor Municipal Core Plus Bond Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® Municipal Core Plus Bond Fund
Class Name Fidelity Advisor® Municipal Core Plus Bond Fund Class C
Trading Symbol FMBEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Municipal Core Plus Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 68 
1.37%
  
Expenses Paid, Amount $ 68
Expense Ratio, Percent 1.37%
Net Assets $ 59,223,606
Holdings Count | shares 315
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$59,223,606
 
  
Number of Holdings
315
 
  
Portfolio Turnover
30%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 19.7   General Obligations 16.9   Transportation 12.2   Education 11.3   Housing 7.4   State G.O. 7.0   Special Tax 6.5   Others(Individually Less Than 5%) 19.0   100.0       AAA 8.1 AA 30.2 A 30.9 BBB 20.6 BB 0.6 B 0.5 Not Rated 5.4 Short-Term Investments and Net Other Assets (Liabilities) 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Illinois 10.4 New Jersey 8.6 Florida 6.1 Alabama 5.4 Connecticut 5.3      
Fidelity Advisor Sustainable Intermediate Municipal Income Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Sustainable Intermediate Municipal Income Fund Class I
Trading Symbol FASUX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Intermediate Municipal Income Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 18 
0.37%
  
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.37%
Net Assets $ 15,835,114
Holdings Count | shares 249
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$15,835,114
 
  
Number of Holdings
249
 
  
Portfolio Turnover
15%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 21.2   General Obligations 21.1   Education 16.3   Electric Utilities 9.6   Housing 8.1   State G.O. 6.7   Special Tax 5.6   Others(Individually Less Than 5%) 11.4   100.0       AAA 8.9 AA 41.8 A 32.1 BBB 17.0 BB 0.3 Not Rated 0.1 QUALITY DIVERSIFICATION (% of Fund's net assets)   Short-Term Investments and Net Other Assets (Liabilities) - (0.2)%*   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) New York 9.1 Illinois 8.3 California 7.0 Florida 5.7 Georgia 5.6      
Fidelity Municipal Core Plus Bond Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Municipal Core Plus Bond Fund
Class Name Fidelity® Municipal Core Plus Bond Fund
Trading Symbol FMBAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Municipal Core Plus Bond Fund for the period February 1, 2024 to July 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Municipal Core Plus Bond Fund 
$ 18 
0.37%
  
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.37%
Net Assets $ 59,223,606
Holdings Count | shares 315
Investment Company Portfolio Turnover 30.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of July 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$59,223,606
 
  
Number of Holdings
315
 
  
Portfolio Turnover
30%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) Health Care 19.7   General Obligations 16.9   Transportation 12.2   Education 11.3   Housing 7.4   State G.O. 7.0   Special Tax 6.5   Others(Individually Less Than 5%) 19.0   100.0       AAA 8.1 AA 30.2 A 30.9 BBB 20.6 BB 0.6 B 0.5 Not Rated 5.4 Short-Term Investments and Net Other Assets (Liabilities) 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.   TOP STATES (% of Fund's net assets) Illinois 10.4 New Jersey 8.6 Florida 6.1 Alabama 5.4 Connecticut 5.3