Risk/Return Detail Data - FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO |
Mar. 01, 2025
USD ($)
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| Risk/Return: | ||||||||||||
| Registrant Name | Fidelity Municipal Trust | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | ||||||||||||
| Risk/Return: | ||||||||||||
| Risk/Return [Heading] | Fund Summary Fund /Class: Fidelity® Limited Term Municipal Income Fund /Fidelity Advisor® Limited Term Municipal Income Fund A, M, C, I, Z | |||||||||||
| Objective [Heading] | Investment Objective | |||||||||||
| Objective, Primary [Text Block] | Fidelity® Limited Term Municipal Income Fund seeks as high a level of current income, exempt from federal income tax, as is consistent with preservation of capital. | |||||||||||
| Expense [Heading] | Fee Table | |||||||||||
| Expense Narrative [Text Block] | The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 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 33 of the prospectus and in the sales charge waiver appendix to the prospectus. | |||||||||||
| Shareholder Fees Caption [Text] | Shareholder fees | |||||||||||
| Operating Expenses Caption [Text] | Annual Operating Expenses | |||||||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | Apr. 30, 2026 | |||||||||||
| Portfolio Turnover [Heading] | Portfolio Turnover | |||||||||||
| Portfolio Turnover [Text Block] | 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 22 % of the average value of its portfolio. | |||||||||||
| Portfolio Turnover, Rate | 22.00% | |||||||||||
| Expense Breakpoint Discounts [Text] | 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 33 of the prospectus | |||||||||||
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 50,000 | |||||||||||
| Expense Example Narrative [Text Block] | 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 the 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: | |||||||||||
| Strategy [Heading] | Principal Investment Strategies | |||||||||||
| Strategy Narrative [Text Block] | Normally investing at least 80% of assets in municipal securities whose interest is exempt from federal income tax. The municipal securities in which the fund invests are normally investment-grade (those of medium and high quality). Municipal debt securities are issued to raise money for a variety of public and private purposes, including general financing for state and local governments, financing for eligible non-profit organizations, or financing for a specific project or public facility. Municipal debt securities in which the fund invests include securities issued by U.S. territories and possessions, general obligation bonds of municipalities, local or state governments, project or revenue-specific bonds, or pre-refunded or escrowed bonds, municipal money market securities, and synthetic securities. Municipal securities usually pay a fixed, variable, or floating rate of interest, and must repay the amount borrowed, usually at the maturity of the security. Investment grade securities in which the fund invests include securities or issuers rated at least BBB- or its equivalent by at least one nationally recognized statistical ratings organization (NRSRO), or, if unrated, determined by the Adviser to be of comparable quality. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Managing the fund to have similar overall interest rate risk to the supplemental index (see "Additional Index Information" section of the prospectus). Normally maintaining a dollar-weighted average maturity between two and five 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] | Principal Investment Risks | |||||||||||
| Bar Chart and Performance Table [Heading] | Performance | |||||||||||
| Performance Narrative [Text Block] | 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 additional index has 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 institutional.fidelity.com for more recent performance information. | |||||||||||
| Performance Information Illustrates Variability of Returns [Text] | 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 Availability Website Address [Text] | institutional.fidelity.com | |||||||||||
| Performance Past Does Not Indicate Future [Text] | Past performance (before and after taxes) is not an indication of future performance. | |||||||||||
| Bar Chart [Heading] | Year-by-Year Returns | |||||||||||
| Bar Chart Narrative [Text Block] | 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. | |||||||||||
| Bar Chart Does Not Reflect Sales Loads [Text] | 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. | |||||||||||
| Highest Quarterly Return, Label | Highest Quarter Return | |||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2023 | |||||||||||
| Highest Quarterly Return | 3.71% | |||||||||||
| Lowest Quarterly Return, Label | Lowest Quarter Return | |||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2022 | |||||||||||
| Lowest Quarterly Return | (3.95%) | |||||||||||
| Performance Table Heading | Average Annual Returns | |||||||||||
| Performance Table Does Reflect Sales Loads | Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. | |||||||||||
| Performance Table Uses Highest Federal Rate | 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 | 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). | |||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. | |||||||||||
| Performance Table Explanation after Tax Higher | 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. | |||||||||||
| Performance Table Narrative | 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. 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. | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Fidelity Advisor Limited Term Municipal Income Fund - Class A | ||||||||||||
| Risk/Return: | ||||||||||||
| Maximum sales charge (load) on purchases (as a % of offering price) | 2.75% | |||||||||||
| Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) | none | [1] | ||||||||||
| Management fee | 0.20% | |||||||||||
| Distribution and/or Service (12b-1) fees | 0.25% | |||||||||||
| Other expenses | 0.18% | |||||||||||
| Total annual operating expenses | 0.63% | |||||||||||
| Fee waiver and/or expense reimbursement | 0.08% | [2] | ||||||||||
| Total annual operating expenses after fee waiver and/or expense reimbursement | 0.55% | |||||||||||
| Expenses Deferred Charges [Text Block] | Purchases of $250,000 or more will not be subject to a front-end sales charge, but may be subject to a 0.50% contingent deferred sales charge (CDSC) if the intermediary firm has elected an upfront finder's fee at the time the shares are purchased, or a 0.75% CDSC if the shares purchased are recordkept in a Fidelity Advisor ® 401(k) Retirement Plan. | |||||||||||
| 1 year | $ 330 | |||||||||||
| 3 years | 461 | |||||||||||
| 5 years | 606 | |||||||||||
| 10 years | 1,030 | |||||||||||
| 1 Year | 330 | |||||||||||
| 3 Years | 461 | |||||||||||
| 5 Years | 606 | |||||||||||
| 10 Years | $ 1,030 | |||||||||||
| 2015 | 0.76% | |||||||||||
| 2016 | (0.68%) | |||||||||||
| 2017 | 2.00% | |||||||||||
| 2018 | 0.93% | |||||||||||
| 2019 | 3.83% | |||||||||||
| 2020 | 3.04% | |||||||||||
| 2021 | 0.07% | |||||||||||
| 2022 | (4.82%) | |||||||||||
| 2023 | 3.66% | |||||||||||
| 2024 | 2.07% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Fidelity Advisor Limited Term Municipal Income Fund - Class C | ||||||||||||
| Risk/Return: | ||||||||||||
| Maximum sales charge (load) on purchases (as a % of offering price) | none | |||||||||||
| Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) | 1.00% | [3] | ||||||||||
| Management fee | 0.20% | |||||||||||
| Distribution and/or Service (12b-1) fees | 1.00% | |||||||||||
| Other expenses | 0.07% | |||||||||||
| Total annual operating expenses | 1.27% | |||||||||||
| Fee waiver and/or expense reimbursement | none | |||||||||||
| Total annual operating expenses after fee waiver and/or expense reimbursement | 1.27% | |||||||||||
| Expenses Deferred Charges [Text Block] | On Class C shares redeemed less than one year after purchase. | |||||||||||
| 1 year | $ 229 | |||||||||||
| 3 years | 403 | |||||||||||
| 5 years | 697 | |||||||||||
| 10 years | 1,357 | |||||||||||
| 1 Year | 129 | |||||||||||
| 3 Years | 403 | |||||||||||
| 5 Years | 697 | |||||||||||
| 10 Years | $ 1,357 | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Fidelity Advisor Limited Term Municipal Income Fund - Class M | ||||||||||||
| Risk/Return: | ||||||||||||
| Maximum sales charge (load) on purchases (as a % of offering price) | 2.75% | |||||||||||
| Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) | none | [4] | ||||||||||
| Management fee | 0.20% | |||||||||||
| Distribution and/or Service (12b-1) fees | 0.25% | |||||||||||
| Other expenses | 0.13% | |||||||||||
| Total annual operating expenses | 0.58% | |||||||||||
| Fee waiver and/or expense reimbursement | 0.03% | [2] | ||||||||||
| Total annual operating expenses after fee waiver and/or expense reimbursement | 0.55% | |||||||||||
| Expenses Deferred Charges [Text Block] | Purchases of $250,000 or more will not be subject to a front-end sales charge but may be subject to a 0.25% CDSC if a finder's fee is paid at the time the shares are purchased. | |||||||||||
| 1 year | $ 330 | |||||||||||
| 3 years | 452 | |||||||||||
| 5 years | 586 | |||||||||||
| 10 years | 977 | |||||||||||
| 1 Year | 330 | |||||||||||
| 3 Years | 452 | |||||||||||
| 5 Years | 586 | |||||||||||
| 10 Years | $ 977 | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Fidelity Advisor Limited Term Municipal Income Fund - Class I | ||||||||||||
| Risk/Return: | ||||||||||||
| Maximum sales charge (load) on purchases (as a % of offering price) | none | |||||||||||
| Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) | none | |||||||||||
| Management fee | 0.20% | |||||||||||
| Distribution and/or Service (12b-1) fees | none | |||||||||||
| Other expenses | 0.17% | |||||||||||
| Total annual operating expenses | 0.37% | |||||||||||
| Fee waiver and/or expense reimbursement | 0.07% | [2] | ||||||||||
| Total annual operating expenses after fee waiver and/or expense reimbursement | 0.30% | |||||||||||
| 1 year | $ 31 | |||||||||||
| 3 years | 109 | |||||||||||
| 5 years | 198 | |||||||||||
| 10 years | 459 | |||||||||||
| 1 Year | 31 | |||||||||||
| 3 Years | 109 | |||||||||||
| 5 Years | 198 | |||||||||||
| 10 Years | $ 459 | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Fidelity Advisor Limited Term Municipal Income Fund - Class Z | ||||||||||||
| Risk/Return: | ||||||||||||
| Maximum sales charge (load) on purchases (as a % of offering price) | none | |||||||||||
| Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) | none | |||||||||||
| Management fee | 0.20% | |||||||||||
| Distribution and/or Service (12b-1) fees | none | |||||||||||
| Other expenses | 0.05% | |||||||||||
| Total annual operating expenses | 0.25% | |||||||||||
| Fee waiver and/or expense reimbursement | none | |||||||||||
| Total annual operating expenses after fee waiver and/or expense reimbursement | 0.25% | |||||||||||
| 1 year | $ 26 | |||||||||||
| 3 years | 80 | |||||||||||
| 5 years | 141 | |||||||||||
| 10 years | 318 | |||||||||||
| 1 Year | 26 | |||||||||||
| 3 Years | 80 | |||||||||||
| 5 Years | 141 | |||||||||||
| 10 Years | $ 318 | |||||||||||
| Annual Return, Inception Date | Oct. 02, 2018 | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Return Before Taxes | Fidelity Advisor Limited Term Municipal Income Fund - Class A | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Return Before Taxes | |||||||||||
| Past 1 year | (0.73%) | |||||||||||
| Past 5 years | 0.20% | |||||||||||
| Past 10 years | 0.78% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Return Before Taxes | Fidelity Advisor Limited Term Municipal Income Fund - Class C | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Return Before Taxes | |||||||||||
| Past 1 year | 0.34% | |||||||||||
| Past 5 years | 0.03% | |||||||||||
| Past 10 years | 0.47% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Return Before Taxes | Fidelity Advisor Limited Term Municipal Income Fund - Class M | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Return Before Taxes | |||||||||||
| Past 1 year | (0.73%) | |||||||||||
| Past 5 years | 0.20% | |||||||||||
| Past 10 years | 0.80% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Return Before Taxes | Fidelity Advisor Limited Term Municipal Income Fund - Class I | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Return Before Taxes | |||||||||||
| Past 1 year | 2.33% | |||||||||||
| Past 5 years | 1.04% | |||||||||||
| Past 10 years | 1.33% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | Return Before Taxes | Fidelity Advisor Limited Term Municipal Income Fund - Class Z | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Return Before Taxes | |||||||||||
| Past 1 year | 2.38% | |||||||||||
| Past 5 years | 1.09% | |||||||||||
| Since Inception | 1.72% | [5] | ||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | After Taxes on Distributions | Fidelity Advisor Limited Term Municipal Income Fund - Class A | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Return After Taxes on Distributions | |||||||||||
| Past 1 year | (0.73%) | |||||||||||
| Past 5 years | 0.19% | |||||||||||
| Past 10 years | 0.76% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | After Taxes on Distributions and Sales | Fidelity Advisor Limited Term Municipal Income Fund - Class A | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Return After Taxes on Distributions and Sale of Fund Shares | |||||||||||
| Past 1 year | 0.27% | |||||||||||
| Past 5 years | 0.45% | |||||||||||
| Past 10 years | 0.88% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | LB015 | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Bloomberg Municipal Bond Index | |||||||||||
| Past 1 year | 1.05% | |||||||||||
| Past 5 years | 0.99% | |||||||||||
| Past 10 years | 2.25% | |||||||||||
| FidelityLimitedTermMunicipalIncomeFund-AMCIZPRO | Fidelity Limited Term Municipal Income Fund | LB086 | ||||||||||||
| Risk/Return: | ||||||||||||
| Label | Bloomberg 1-6 Year Municipal Bond Index | |||||||||||
| Past 1 year | 1.86% | |||||||||||
| Past 5 years | 1.08% | |||||||||||
| Past 10 years | 1.45% | |||||||||||
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