XML 18 R26.htm IDEA: XBRL DOCUMENT v2.4.0.6
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2011
Registrant Name dei_EntityRegistrantName FIDELITY SCHOOL STREET TRUST
Central Index Key dei_EntityCentralIndexKey 0000215829
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Feb. 28, 2012
Document Effective Date dei_DocumentEffectiveDate Feb. 29, 2012
Prospectus Date rr_ProspectusDate Feb. 29, 2012
Fidelity Strategic Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund:
Fidelity® Strategic Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks a high level of current income. The fund may also seek capital appreciation.
Fee Table fsst215829_FundFeesAndExpenseAbstract  
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Shareholder fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a % of the value of your investment)
Management fee rr_ManagementFeesOverAssets 0.57%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.13%
Total annual operating expenses rr_ExpensesOverAssets 0.70%
Expense Example rr_ExpenseExampleAbstract  
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
1 year rr_ExpenseExampleYear01 72
3 years rr_ExpenseExampleYear03 224
5 years rr_ExpenseExampleYear05 390
10 years rr_ExpenseExampleYear10 871
Portfolio Turnover fsst215829_PortfolioTurnoverAltAbstract  
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 229% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 229.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Investing primarily in debt securities, including lower-quality debt securities.
  • Allocating the fund's assets among four general investment categories: high yield securities, U.S. Government and investment-grade securities, emerging market securities, and foreign developed market securities.
  • Potentially investing in equity securities.
  • Using a neutral mix of approximately 40% high yield, 30% U.S. Government and investment-grade, 15% emerging markets, and 15% foreign developed markets.
  • Analyzing a security's structural features and current pricing, its issuer's potential for success, and the credit, currency, and economic risks of the security and its issuer to select investments.
  • Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity funds to invest in particular security types or investment disciplines).
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market can react differently to these developments.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile.
  • Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease. Lower-quality debt securities (those of less than investment-grade quality) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fsst215829_FundPastPerformanceAbstract  
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fidelity.com
Annual Total Returns rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Returns

Calendar Years
2002 rr_AnnualReturn2002 9.38%
2003 rr_AnnualReturn2003 18.62%
2004 rr_AnnualReturn2004 9.44%
2005 rr_AnnualReturn2005 3.12%
2006 rr_AnnualReturn2006 8.15%
2007 rr_AnnualReturn2007 5.44%
2008 rr_AnnualReturn2008 (11.37%)
2009 rr_AnnualReturn2009 31.77%
2010 rr_AnnualReturn2010 9.93%
2011 rr_AnnualReturn2011 4.64%
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return13.34% June 30, 2009
Lowest Quarter Return -8.09%December 31, 2008
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.34%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.09%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement.
For the periods ended
December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement.
Return Before Taxes | Fidelity Strategic Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Strategic Income Fund
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 4.64%
Past 5 years rr_AverageAnnualReturnYear05 7.21%
Past 10 years rr_AverageAnnualReturnYear10 8.42%
Return After Taxes on Distributions | Fidelity Strategic Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Strategic Income Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 2.40%
Past 5 years rr_AverageAnnualReturnYear05 4.89%
Past 10 years rr_AverageAnnualReturnYear10 6.10%
Return After Taxes on Distributions and Sale of Fund Shares | Fidelity Strategic Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Strategic Income Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 3.32%
Past 5 years rr_AverageAnnualReturnYear05 4.83%
Past 10 years rr_AverageAnnualReturnYear10 5.92%
The BofA Merrill Lynch℠ US High Yield Constrained Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Strategic Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel The BofA Merrill LynchSM US High Yield Constrained Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 4.37%
Past 5 years rr_AverageAnnualReturnYear05 7.54%
Past 10 years rr_AverageAnnualReturnYear10 8.74%
Fidelity Strategic Income Composite Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Strategic Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Fidelity Strategic Income Composite Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 6.59%
Past 5 years rr_AverageAnnualReturnYear05 7.44%
Past 10 years rr_AverageAnnualReturnYear10 8.31%
Retail | Fidelity Intermediate Municipal Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund/Class:
Fidelity® Intermediate Municipal Income Fund/Fidelity Intermediate Municipal Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks as high a level of current income, exempt from federal income tax, as is consistent with the preservation of capital.
Fee Table fsst215829_FundFeesAndExpenseAbstract  
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Example rr_ExpenseExampleAbstract  
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
Portfolio Turnover fsst215829_PortfolioTurnoverAltAbstract  
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 14% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 14.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal income tax.
  • Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
  • Normally maintaining a dollar-weighted average maturity between three and 10 years.
  • Allocating assets across different market sectors and maturities.
  • Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
  • Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fsst215829_FundPastPerformanceAbstract  
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for updated return information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fidelity.com
Annual Total Returns rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return4.75%September 30, 2009
Lowest Quarter Return-2.48%December 31, 2010
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances.
For the periods ended
December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Retail | Fidelity Intermediate Municipal Income Fund | Class: Fidelity Intermediate Municipal Income Fund
  
Shareholder fees rr_ShareholderFeesAbstract  
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.50%
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.11%
Total annual operating expenses rr_ExpensesOverAssets 0.40%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 41
3 years rr_ExpenseExampleYear03 128
5 years rr_ExpenseExampleYear05 224
10 years rr_ExpenseExampleYear10 505
Annual Total Returns rr_BarChartTableAbstract  
2002 rr_AnnualReturn2002 9.02%
2003 rr_AnnualReturn2003 5.30%
2004 rr_AnnualReturn2004 3.74%
2005 rr_AnnualReturn2005 2.56%
2006 rr_AnnualReturn2006 3.97%
2007 rr_AnnualReturn2007 3.97%
2008 rr_AnnualReturn2008 0.96%
2009 rr_AnnualReturn2009 8.65%
2010 rr_AnnualReturn2010 2.65%
2011 rr_AnnualReturn2011 7.96%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.75%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.48%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Retail | Return Before Taxes | Fidelity Intermediate Municipal Income Fund | Class: Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Intermediate Municipal Income Fund
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 7.96%
Past 5 years rr_AverageAnnualReturnYear05 4.80%
Past 10 years rr_AverageAnnualReturnYear10 4.85%
Retail | Return After Taxes on Distributions | Fidelity Intermediate Municipal Income Fund | Class: Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Intermediate Municipal Income Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 7.94%
Past 5 years rr_AverageAnnualReturnYear05 4.77%
Past 10 years rr_AverageAnnualReturnYear10 4.78%
Retail | Return After Taxes on Distributions and Sale of Fund Shares | Fidelity Intermediate Municipal Income Fund | Class: Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Intermediate Municipal Income Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 6.44%
Past 5 years rr_AverageAnnualReturnYear05 4.63%
Past 10 years rr_AverageAnnualReturnYear10 4.70%
Retail | Barclays Capital® Municipal Bond Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital® Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 10.70%
Past 5 years rr_AverageAnnualReturnYear05 5.22%
Past 10 years rr_AverageAnnualReturnYear10 5.38%
Retail | Barclays Capital 1-17 Year Municipal Bond Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital 1-17 Year Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 8.80%
Past 5 years rr_AverageAnnualReturnYear05 5.48%
Past 10 years rr_AverageAnnualReturnYear10 5.12%
A T B C | Fidelity Intermediate Municipal Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund/Class:
Fidelity® Intermediate Municipal Income Fund/Fidelity Advisor® Intermediate Municipal Income Fund A, T, B, C
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks as high a level of current income, exempt from federal income tax, as is consistent with the preservation of capital.
Fee Table fsst215829_FundFeesAndExpenseAbstract  
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page (Click Here) of the prospectus.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 50,000
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Example rr_ExpenseExampleAbstract  
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sell All Shares
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Hold Shares
Portfolio Turnover fsst215829_PortfolioTurnoverAltAbstract  
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 14% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 14.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal income tax.
  • Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
  • Normally maintaining a dollar-weighted average maturity between three and 10 years.
  • Allocating assets across different market sectors and maturities.
  • Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
  • Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fsst215829_FundPastPerformanceAbstract  
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.advisor.fidelity.com for updated return information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.advisor.fidelity.com
Annual Total Returns rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Returns
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart for Class A:
Returns
Quarter ended
Highest Quarter Return4.78%September 30, 2009
Lowest Quarter Return -2.64%December 31, 2010
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances.
For the periods ended
December 31, 2011
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.
A T B C | Fidelity Intermediate Municipal Income Fund | Class A
  
Shareholder fees rr_ShareholderFeesAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 4.00%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.50%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual operating expenses rr_ExpensesOverAssets 0.68%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 467
3 years rr_ExpenseExampleYear03 609
5 years rr_ExpenseExampleYear05 764
10 years rr_ExpenseExampleYear10 1,213
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 467
3 years rr_ExpenseExampleNoRedemptionYear03 609
5 years rr_ExpenseExampleNoRedemptionYear05 764
10 years rr_ExpenseExampleNoRedemptionYear10 1,213
Annual Total Returns rr_BarChartTableAbstract  
2006 rr_AnnualReturn2006 3.77%
2007 rr_AnnualReturn2007 3.71%
2008 rr_AnnualReturn2008 0.69%
2009 rr_AnnualReturn2009 8.43%
2010 rr_AnnualReturn2010 2.25%
2011 rr_AnnualReturn2011 7.65%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.78%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.64%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
A T B C | Fidelity Intermediate Municipal Income Fund | Class T
  
Shareholder fees rr_ShareholderFeesAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 4.00%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.50%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.13%
Total annual operating expenses rr_ExpensesOverAssets 0.67%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 466
3 years rr_ExpenseExampleYear03 606
5 years rr_ExpenseExampleYear05 758
10 years rr_ExpenseExampleYear10 1,201
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 466
3 years rr_ExpenseExampleNoRedemptionYear03 606
5 years rr_ExpenseExampleNoRedemptionYear05 758
10 years rr_ExpenseExampleNoRedemptionYear10 1,201
A T B C | Fidelity Intermediate Municipal Income Fund | Class B
  
Shareholder fees rr_ShareholderFeesAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 5.00% [2]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.50%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Declines over 6 years from 5.00% to 0%.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.90%
Other expenses rr_OtherExpensesOverAssets 0.13%
Total annual operating expenses rr_ExpensesOverAssets 1.32%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 634
3 years rr_ExpenseExampleYear03 718
5 years rr_ExpenseExampleYear05 923
10 years rr_ExpenseExampleYear10 1,332
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 134
3 years rr_ExpenseExampleNoRedemptionYear03 418
5 years rr_ExpenseExampleNoRedemptionYear05 723
10 years rr_ExpenseExampleNoRedemptionYear10 1,332
A T B C | Fidelity Intermediate Municipal Income Fund | Class C
  
Shareholder fees rr_ShareholderFeesAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.50%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual operating expenses rr_ExpensesOverAssets 1.46%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 249
3 years rr_ExpenseExampleYear03 462
5 years rr_ExpenseExampleYear05 797
10 years rr_ExpenseExampleYear10 1,746
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
1 year rr_ExpenseExampleNoRedemptionYear01 149
3 years rr_ExpenseExampleNoRedemptionYear03 462
5 years rr_ExpenseExampleNoRedemptionYear05 797
10 years rr_ExpenseExampleNoRedemptionYear10 1,746
A T B C | Return Before Taxes | Fidelity Intermediate Municipal Income Fund | Class A
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 3.35%
Past 5 years rr_AverageAnnualReturnYear05 3.65%
Life of class rr_AverageAnnualReturnSinceInception 3.76% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
A T B C | Return Before Taxes | Fidelity Intermediate Municipal Income Fund | Class T
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class T - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 3.36%
Past 5 years rr_AverageAnnualReturnYear05 3.67%
Life of class rr_AverageAnnualReturnSinceInception 3.76% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
A T B C | Return Before Taxes | Fidelity Intermediate Municipal Income Fund | Class B
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class B - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 1.98%
Past 5 years rr_AverageAnnualReturnYear05 3.47%
Life of class rr_AverageAnnualReturnSinceInception 3.75% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
A T B C | Return Before Taxes | Fidelity Intermediate Municipal Income Fund | Class C
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class C - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 5.82%
Past 5 years rr_AverageAnnualReturnYear05 3.71%
Life of class rr_AverageAnnualReturnSinceInception 3.66% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
A T B C | Return After Taxes on Distributions | Fidelity Intermediate Municipal Income Fund | Class A
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 3.33%
Past 5 years rr_AverageAnnualReturnYear05 3.63%
Life of class rr_AverageAnnualReturnSinceInception 3.73% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
A T B C | Return After Taxes on Distributions and Sale of Fund Shares | Fidelity Intermediate Municipal Income Fund | Class A
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 3.29%
Past 5 years rr_AverageAnnualReturnYear05 3.59%
Life of class rr_AverageAnnualReturnSinceInception 3.69% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
A T B C | Barclays Capital® Municipal Bond Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital® Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 10.70%
Past 5 years rr_AverageAnnualReturnYear05 5.22%
Life of class rr_AverageAnnualReturnSinceInception 5.25% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
A T B C | Barclays Capital 1-17 Year Municipal Bond Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital 1-17 Year Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 8.80%
Past 5 years rr_AverageAnnualReturnYear05 5.48%
Life of class rr_AverageAnnualReturnSinceInception 5.29% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
Inst | Fidelity Intermediate Municipal Income Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Fund Summary
Fund/Class:
Fidelity® Intermediate Municipal Income Fund/Fidelity Advisor® Intermediate Municipal Income Fund Institutional
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks as high a level of current income, exempt from federal income tax, as is consistent with the preservation of capital.
Fee Table fsst215829_FundFeesAndExpenseAbstract  
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that may be incurred when you buy, hold, or sell shares of the fund.
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Annual class operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses (expenses that you pay each year as a % of the value of your investment)
Expense Example rr_ExpenseExampleAbstract  
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other mutual funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
Portfolio Turnover fsst215829_PortfolioTurnoverAltAbstract  
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 14% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 14.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing at least 80% of assets in investment-grade municipal securities whose interest is exempt from federal income tax.
  • Managing the fund to have similar overall interest rate risk to an index designed to represent Fidelity Management & Research Company (FMR)'s view of how the fund's competitive universe will perform over time.
  • Normally maintaining a dollar-weighted average maturity between three and 10 years.
  • Allocating assets across different market sectors and maturities.
  • Potentially investing more than 25% of total assets in municipal securities that finance similar types of projects.
  • Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Municipal Market Volatility. The municipal market is volatile and can be significantly affected by adverse tax, legislative, or political changes and the financial condition of the issuers of municipal securities.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Performance fsst215829_FundPastPerformanceAbstract  
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Information about the Indexes section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.advisor.fidelity.com for updated return information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.advisor.fidelity.com
Annual Total Returns rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Returns

Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return4.84%September 30, 2009
Lowest Quarter Return -2.55%December 31, 2010
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances.
For the periods ended
December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Inst | Fidelity Intermediate Municipal Income Fund | Institutional Class
  
Shareholder fees rr_ShareholderFeesAbstract  
Redemption fee on shares held less than 30 days (as a % of amount redeemed) rr_RedemptionFeeOverRedemption 0.50%
Annual class operating expenses rr_OperatingExpensesAbstract  
Management fee rr_ManagementFeesOverAssets 0.29%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual operating expenses rr_ExpensesOverAssets 0.44%
Expense Example rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 45
3 years rr_ExpenseExampleYear03 141
5 years rr_ExpenseExampleYear05 246
10 years rr_ExpenseExampleYear10 555
Annual Total Returns rr_BarChartTableAbstract  
2006 rr_AnnualReturn2006 4.06%
2007 rr_AnnualReturn2007 3.95%
2008 rr_AnnualReturn2008 0.96%
2009 rr_AnnualReturn2009 8.69%
2010 rr_AnnualReturn2010 2.49%
2011 rr_AnnualReturn2011 7.91%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.84%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.55%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Inst | Return Before Taxes | Fidelity Intermediate Municipal Income Fund | Institutional Class
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 7.91%
Past 5 years rr_AverageAnnualReturnYear05 4.75%
Life of class rr_AverageAnnualReturnSinceInception 4.70% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
Inst | Return After Taxes on Distributions | Fidelity Intermediate Municipal Income Fund | Institutional Class
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 7.89%
Past 5 years rr_AverageAnnualReturnYear05 4.73%
Life of class rr_AverageAnnualReturnSinceInception 4.67% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
Inst | Return After Taxes on Distributions and Sale of Fund Shares | Fidelity Intermediate Municipal Income Fund | Institutional Class
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 6.39%
Past 5 years rr_AverageAnnualReturnYear05 4.59%
Life of class rr_AverageAnnualReturnSinceInception 4.55% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
Inst | Barclays Capital® Municipal Bond Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital® Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 10.70%
Past 5 years rr_AverageAnnualReturnYear05 5.22%
Life of class rr_AverageAnnualReturnSinceInception 5.25% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
Inst | Barclays Capital 1-17 Year Municipal Bond Index (reflects no deduction for fees, expenses, or taxes) | Fidelity Intermediate Municipal Income Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital 1-17 Year Municipal Bond Index
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Past 1 year rr_AverageAnnualReturnYear01 8.80%
Past 5 years rr_AverageAnnualReturnYear05 5.48%
Life of class rr_AverageAnnualReturnSinceInception 5.29% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2005
[1] Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.
[2] Declines over 6 years from 5.00% to 0%.
[3] On Class C shares redeemed less than one year after purchase.
[4] From October 31, 2005.