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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY MUNICIPAL TRUST
Prospectus Date rr_ProspectusDate Mar. 01, 2019
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <p style="font: bold 20pt Arial, Helvetica, sans-serif;">Fund Summary</p><p style="font: normal 12pt Arial, Helvetica, sans-serif;"><b>Fund/Class</b>:<br/><b>Fidelity® Municipal Income Fund</b>/Fidelity Advisor® Municipal Income Fund A, M, C, I, Z</p>
Objective [Heading] rr_ObjectiveHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;">Investment Objective</font>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks to provide a high current yield exempt from federal income tax.
Expense [Heading] rr_ExpenseHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Fee Table</b></font>
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. In addition to the fees and expenses described below, your broker may also require you to pay brokerage commissions on purchases and sales of certain share classes 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 31 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <p style="font: bold 11pt Arial, sans-serif; margin-bottom: 0px;">Shareholder fees</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">(fees paid directly from your investment)</p>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <p style="font: bold 11pt Arial, sans-serif; margin-bottom: 0px;">Annual Operating Expenses</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">(expenses that you pay each year as a % of the value of your investment)</p>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Portfolio Turnover</b></font>
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%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <font style="FONT-FAMILY: Times New Roman" size="3">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 31 of the prospectus.</font>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 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 <p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Sell All Shares</p>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Hold Shares</p>
Strategy [Heading] rr_StrategyHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Principal Investment Strategies</b></font>
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.
  • 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 <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Principal Investment Risks</b></font>
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 Lose Money [Text] rr_RiskLoseMoney <font style="FONT-FAMILY: Times New Roman" size="3">You could lose money by investing in the fund.</font>
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution <font style="FONT-FAMILY: Times New Roman" size="3">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.</font>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Performance</b></font>
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 Fidelity® Municipal Income Fund, a class of shares of the fund, from year to year and compares the performance of this class 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 Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information for Fidelity® Municipal Income Fund, a class of shares of the fund.

Performance history will be available at institutional.fidelity.com for Class A, Class M, Class C, Class I, and Class Z after Class A, Class M, Class C, Class I, and Class Z have been in operation for one calendar year.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <font style="FONT-FAMILY: Times New Roman" size="3">The information illustrates the changes in the performance of Fidelity® Municipal Income Fund, a class of shares of the fund, from year to year and compares the performance of this class to the performance of a securities market index and an additional index over various periods of time.</font>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <font style="FONT-FAMILY: Times New Roman" size="3">www.fidelity.com </font>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <font style="FONT-FAMILY: Times New Roman" size="3">Past performance (before and after taxes) is not an indication of future performance.</font>
Bar Chart [Heading] rr_BarChartHeading <p style="font:bold 11pt Arial, sans-serif; margin-bottom: 0px;">Year-by-Year Returns*</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Calendar Years</p>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:ReturnsQuarter ended
Highest Quarter Return7.46%September 30, 2009
Lowest Quarter Return-4.47%December 31, 2016
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus <font style="FONT-FAMILY: Times New Roman" size="3">* The returns shown above are for Fidelity® Municipal Income Fund, a class of shares of the fund that is not offered through this prospectus. Class A, Class M, Class C, Class I, and Class Z would have substantially similar annual returns to Fidelity® Municipal Income Fund because the classes are invested in the same portfolio of securities. Class A’s, Class M’s, Class C’s, Class I's, and Class Z's returns would differ from Fidelity® Municipal Income Fund’s returns only to the extent that the classes do not have the same expenses.</font>
Performance Table Heading rr_PerformanceTableHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Average Annual Returns*</b></font>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <font style="FONT-FAMILY: Times New Roman" size="3">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.</font>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <font style="FONT-FAMILY: Times New Roman" size="3">The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).</font>
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher <font style="FONT-FAMILY: Times New Roman" size="3">Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.</font>
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, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2018

* The returns shown above are for Fidelity® Municipal Income Fund, a class of shares of the fund that is not offered through this prospectus. Class A, Class M, Class C, Class I, and Class Z would have substantially similar annual returns to Fidelity® Municipal Income Fund because the classes are invested in the same portfolio of securities. Class A’s, Class M’s, Class C’s, Class I's, and Class Z’s returns would differ from Fidelity® Municipal Income Fund’s returns only to the extent that the classes do not have the same expenses.
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Fidelity Advisor Municipal Income Fund: Class A  
Risk/Return: rr_RiskReturnAbstract  
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]
Management fee rr_ManagementFeesOverAssets 0.36%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual operating expenses rr_ExpensesOverAssets 0.78%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 476
3 years rr_ExpenseExampleYear03 639
5 years rr_ExpenseExampleYear05 816
10 years rr_ExpenseExampleYear10 1,327
1 Year rr_ExpenseExampleNoRedemptionYear01 476
3 Years rr_ExpenseExampleNoRedemptionYear03 639
5 Years rr_ExpenseExampleNoRedemptionYear05 816
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,327
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Fidelity Advisor Municipal Income Fund: Class M  
Risk/Return: rr_RiskReturnAbstract  
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]
Management fee rr_ManagementFeesOverAssets 0.36%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.16%
Total annual operating expenses rr_ExpensesOverAssets 0.77%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 475
3 years rr_ExpenseExampleYear03 636
5 years rr_ExpenseExampleYear05 811
10 years rr_ExpenseExampleYear10 1,316
1 Year rr_ExpenseExampleNoRedemptionYear01 475
3 Years rr_ExpenseExampleNoRedemptionYear03 636
5 Years rr_ExpenseExampleNoRedemptionYear05 811
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,316
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Fidelity Advisor Municipal Income Fund: Class C  
Risk/Return: rr_RiskReturnAbstract  
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% [2]
Management fee rr_ManagementFeesOverAssets 0.36%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.16%
Total annual operating expenses rr_ExpensesOverAssets 1.52%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
1 year rr_ExpenseExampleYear01 $ 255
3 years rr_ExpenseExampleYear03 480
5 years rr_ExpenseExampleYear05 829
10 years rr_ExpenseExampleYear10 1,813
1 Year rr_ExpenseExampleNoRedemptionYear01 155
3 Years rr_ExpenseExampleNoRedemptionYear03 480
5 Years rr_ExpenseExampleNoRedemptionYear05 829
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,813
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Fidelity Advisor Municipal Income Fund: Class I  
Risk/Return: rr_RiskReturnAbstract  
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 none
Management fee rr_ManagementFeesOverAssets 0.36%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.17%
Total annual operating expenses rr_ExpensesOverAssets 0.53%
1 year rr_ExpenseExampleYear01 $ 54
3 years rr_ExpenseExampleYear03 170
5 years rr_ExpenseExampleYear05 296
10 years rr_ExpenseExampleYear10 665
1 Year rr_ExpenseExampleNoRedemptionYear01 54
3 Years rr_ExpenseExampleNoRedemptionYear03 170
5 Years rr_ExpenseExampleNoRedemptionYear05 296
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 665
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Fidelity Advisor Municipal Income Fund: Class Z  
Risk/Return: rr_RiskReturnAbstract  
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 none
Management fee rr_ManagementFeesOverAssets 0.36%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.06% [3]
Total annual operating expenses rr_ExpensesOverAssets 0.42%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates <font style="FONT-FAMILY: Times New Roman" size="3">Based on estimated amounts for the current fiscal year.</font>
1 year rr_ExpenseExampleYear01 $ 43
3 years rr_ExpenseExampleYear03 135
5 years rr_ExpenseExampleYear05 235
10 years rr_ExpenseExampleYear10 530
1 Year rr_ExpenseExampleNoRedemptionYear01 43
3 Years rr_ExpenseExampleNoRedemptionYear03 135
5 Years rr_ExpenseExampleNoRedemptionYear05 235
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 530
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess <font style="FONT-FAMILY: Times New Roman" size="3">Performance history will be available at institutional.fidelity.com for Class A, Class M, Class C, Class I, and Class Z after Class A, Class M, Class C, Class I, and Class Z have been in operation for one calendar year.</font>
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Fidelity Municipal Income Fund  
Risk/Return: rr_RiskReturnAbstract  
2009 rr_AnnualReturn2009 13.14%
2010 rr_AnnualReturn2010 2.58%
2011 rr_AnnualReturn2011 10.64%
2012 rr_AnnualReturn2012 7.92%
2013 rr_AnnualReturn2013 (2.94%)
2014 rr_AnnualReturn2014 10.59%
2015 rr_AnnualReturn2015 3.31%
2016 rr_AnnualReturn2016 (0.01%)
2017 rr_AnnualReturn2017 6.67%
2018 rr_AnnualReturn2018 0.80%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.46%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.47%)
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Return Before Taxes | Fidelity Municipal Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Municipal Income Fund
Label rr_AverageAnnualReturnLabel <font style="FONT-FAMILY: Times New Roman" ><b>Return Before Taxes</b></font>
Past 1 year rr_AverageAnnualReturnYear01 0.80%
Past 5 years rr_AverageAnnualReturnYear05 4.20%
Past 10 years rr_AverageAnnualReturnYear10 5.15%
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | After Taxes on Distributions | Fidelity Municipal Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Municipal Income Fund
Label rr_AverageAnnualReturnLabel <font style="FONT-FAMILY: Times New Roman" ><b>Return After Taxes on Distributions</b></font>
Past 1 year rr_AverageAnnualReturnYear01 0.64%
Past 5 years rr_AverageAnnualReturnYear05 4.01%
Past 10 years rr_AverageAnnualReturnYear10 5.05%
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | After Taxes on Distributions and Sales | Fidelity Municipal Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Municipal Income Fund
Label rr_AverageAnnualReturnLabel <font style="FONT-FAMILY: Times New Roman" ><b>Return After Taxes on Distributions and Sale of Fund Shares</b></font>
Past 1 year rr_AverageAnnualReturnYear01 1.79%
Past 5 years rr_AverageAnnualReturnYear05 4.02%
Past 10 years rr_AverageAnnualReturnYear10 4.90%
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Bloomberg Barclays Municipal Bond Index(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 1.28%
Past 5 years rr_AverageAnnualReturnYear05 3.82%
Past 10 years rr_AverageAnnualReturnYear10 4.85%
12.31 Fidelity Municipal Income Fund - AMCIZ PRO-04 | Fidelity Municipal Income Fund | Bloomberg Barclays 3+ Year Municipal Bond Index(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 1.20%
Past 5 years rr_AverageAnnualReturnYear05 4.22%
Past 10 years rr_AverageAnnualReturnYear10 5.33%
[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.
[2] On Class C shares redeemed less than one year after purchase.
[3] Based on estimated amounts for the current fiscal year.