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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE MUNICIPAL TRUST
Prospectus Date rr_ProspectusDate Oct. 01, 2017
Class T | Deutsche Managed Municipal Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Deutsche Managed Municipal Bond Fund
Objective [Heading] rr_ObjectiveHeading

Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks to provide income exempt from regular federal income tax.
Expense [Heading] rr_ExpenseHeading

Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

These are the fees and expenses you may pay when you buy and hold shares. You may qualify for sales charge discounts if you invest at least $250,000 in Class T shares in the fund. More information about these discounts is available from your financial advisor and in the Investing in the Funds section (p. 28) and in Purchase and Redemption of Shares in the fund's Statement of Additional Information (SAI) (p. II-16).
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a % of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2018
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 may indicate higher transaction costs and may mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance.

Portfolio turnover rate for fiscal year 2017: 38%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 38.00%
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock

The Advisor has contractually agreed through September 30, 2018 to waive its fees and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expenses) at 0.81% for Class T shares. The agreement may only be terminated with the consent of the fund's Board.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates

1 "Other expenses" for Class T are based on estimated amounts for the current fiscal year.

Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses (including one year of capped expenses in each period) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading

Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Main investments. Under normal circumstances, the fund invests at least 80% of net assets, plus the amount of any borrowings for investment purposes, in securities issued by municipalities across the United States and in other securities whose income is free from regular federal income tax. The fund may invest up to 20% of net assets in securities whose income is subject to the federal alternative minimum tax (AMT).

The fund can buy many types of municipal securities of all maturities. These may include revenue bonds (which are backed by revenues from a particular source) and general obligation bonds (which are typically backed by the issuer's ability to levy taxes). They may also include municipal lease obligations and investments representing an interest therein.

The fund normally invests at least 65% of total assets in municipal securities of the top three grades of credit quality. The fund may invest up to 10% of total assets in high yield debt securities (commonly referred to as junk bonds) of the fifth and sixth credit grades (i.e., as low as grade B). Compared to investment-grade debt securities, junk bonds generally pay higher yields, have higher volatility and higher risk of default on payments of interest or principal.

The fund may also invest in exchange-traded funds (ETFs). The fund's investments in ETFs will be limited to 5% of total assets in any one ETF and 10% of total assets in the aggregate in ETFs.

Management process. Portfolio management looks for securities that appear to offer the best opportunity to meet the fund's objective. In making its buy and sell decisions, portfolio management typically weighs a number of factors against each other, from economic outlooks and possible interest rate movements to characteristics of specific securities, such as coupon, maturity date and call date, and changes in supply and demand within the municipal bond market.

Although portfolio management may adjust the fund's duration (a measure of sensitivity to interest rates) over a wider range, they generally intend to keep the fund's duration similar to that of the Bloomberg Barclays Municipal Bond Index, which is generally between five and nine years.

Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains.

The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund.

The fund may also use other types of derivatives (i) for hedging purposes; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.
Risk [Heading] rr_RiskHeading

Main Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments. The fund may not achieve its investment objective, and is not intended to be a complete investment program. 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 governmental agency.

Interest rate risk. When interest rates rise, prices of debt securities generally decline. The fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The longer the duration of the fund's debt securities, the more sensitive the fund will be to interest rate changes. (As a general rule, a 1% rise in interest rates means a 1% fall in value for every year of duration.)

Credit risk. The fund's performance could be hurt if an issuer of a debt security suffers an adverse change in financial condition that results in the issuer not making timely payments of interest or principal, a security downgrade or an inability to meet a financial obligation. Credit risk is greater for lower-rated securities.

Because the issuers of high-yield debt securities or junk bonds (debt securities rated below the fourth highest credit rating category) may be in uncertain financial health, the prices of their debt securities can be more vulnerable to bad economic news, or even the expectation of bad news, than investment-grade debt securities. Credit risk for high-yield securities is greater than for higher-rated securities.

For securities that rely on third-party guarantors to support their credit quality, the same risks may apply if the financial condition of the guarantor deteriorates or the guarantor ceases to insure securities. Because guarantors may insure many types of securities, including subprime mortgage bonds and other high-risk bonds, their financial condition could deteriorate as a result of events that have little or no connection to securities owned by the fund.

Focus risk. To the extent that the fund focuses on investments from a single state, region or sector of the municipal securities market, its performance can be more volatile than that of a fund that invests more broadly. As an example, factors affecting a state, region or sector such as severe fiscal difficulties, an economic downturn, court rulings, increased expenditures on domestic security or reduced monetary support from the federal government could over time impair a state, region or sector's ability to repay its obligations.

Municipal securities risk. The fund could be impacted by events in the municipal securities market, including the supply and demand for municipal securities. Negative events, such as severe fiscal difficulties, bankruptcy of one or more issuers, an economic downturn, unfavorable legislation, court rulings or political developments, or reduced monetary support from the federal government could hurt fund performance.

Market risk. Deteriorating market conditions might cause a general weakness in the market that reduces the prices of securities in that market. Developments in a particular class of debt securities or the stock market could also adversely affect the fund by reducing the relative attractiveness of debt securities as an investment.

Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.

Derivatives risk. Risks associated with derivatives may include the risk that the derivative is not well correlated with the security, index or currency to which it relates; the risk that derivatives may result in losses or missed opportunities; the risk that the fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; and the risk that the derivative transaction could expose the fund to the effects of leverage, which could increase the fund's exposure to the market and magnify potential losses.

Security selection risk. The securities in the fund's portfolio may decline in value. Portfolio management could be wrong in its analysis of municipalities, industries, companies, economic trends, the relative attractiveness of different securities or other matters.

Counterparty risk. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund.

Tax risk. Income from municipal securities held by the fund could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state tax authorities, or noncompliant conduct of a securities issuer. In addition, a portion of the fund's otherwise exempt-interest distributions may be taxable to those shareholders subject to the federal AMT.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment and/or the fund may sell certain investments at a price or time that is not advantageous in order to meet redemption requests or other cash needs. Unusual market conditions, such as an unusually high volume of redemptions or other similar conditions could increase liquidity risk for the fund, and in extreme conditions, the fund could have difficulty meeting redemption requests.

Prepayment and extension risk. When interest rates fall, issuers of high interest debt obligations may pay off the debts earlier than expected (prepayment risk), and the fund may have to reinvest the proceeds at lower yields. When interest rates rise, issuers of lower interest debt obligations may pay off the debts later than expected (extension risk), thus keeping the fund's assets tied up in lower interest debt obligations. Ultimately, any unexpected behavior in interest rates could increase the volatility of the fund's share price and yield and could hurt fund performance. Prepayments could also create capital gains tax liability in some instances.

Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different from the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.

ETF risk. Because ETFs trade on a securities exchange, their shares may trade at a premium or discount to their net asset value. An ETF is subject to the risks of the assets in which it invests as well as those of the investment strategy it follows. The fund incurs brokerage costs when it buys and sells shares of an ETF and also bears its proportionate share of the ETF's fees and expenses, which are passed through to ETF shareholders.

Fees and expenses incurred by an ETF may include trading costs, operating expenses, licensing fees, trustee fees and marketing expenses. With an index ETF, these costs may contribute to the ETF not fully matching the performance of the index it is designed to track.

Operational and technology risk. Cyber-attacks, disruptions, or failures that affect the fund's service providers or counterparties, issuers of securities held by the fund, or other market participants may adversely affect the fund and its shareholders, including by causing losses for the fund or impairing fund operations.
Risk Lose Money [Text] rr_RiskLoseMoney There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments.
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 governmental agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

Past Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends and distributions were reinvested. For more recent performance figures, go to deutschefunds.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

Class T is a new class of shares and as of the date of this prospectus had not commenced investment operations. In the bar chart and table below, the Class T performance figures are based on the historical performance of the fund's Institutional Class shares adjusted to reflect the higher expenses and applicable sales charges (table only) of Class T. Institutional Class shares are offered in a separate prospectus.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Class T is a new class of shares and as of the date of this prospectus had not commenced investment operations.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress deutschefunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance may not indicate future results.
Bar Chart [Heading] rr_BarChartHeading CALENDAR YEAR TOTAL RETURNS (%) (Class T)
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These year-by-year returns do not include sales charges, if any, and would be lower if they did.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Returns Period ending
Best Quarter 9.02% September 30, 2009
Worst Quarter -4.75% December 31, 2010
Year-to-Date 1.27% June 30, 2017

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
(For periods ended 12/31/2016 expressed as a %)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal income tax rates, but do not reflect any state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant to shares held in an IRA, 401(k) or other tax-advantaged investment plan.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns reflect the historical highest individual federal income tax rates, but do not reflect any state or local taxes. Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an IRA, 401(k) or other tax-advantaged investment plan.
Class T | Deutsche Managed Municipal Bond Fund | Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Management fee rr_ManagementFeesOverAssets 0.32%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Interest expense rr_Component1OtherExpensesOverAssets 0.03%
Other expenses rr_Component3OtherExpensesOverAssets 0.28% [1]
Total other expenses rr_OtherExpensesOverAssets 0.31%
Total annual fund operating expenses rr_ExpensesOverAssets 0.88%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.04%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.84%
1 Year rr_ExpenseExampleYear01 $ 334
3 Years rr_ExpenseExampleYear03 520
5 Years rr_ExpenseExampleYear05 722
10 Years rr_ExpenseExampleYear10 $ 1,304
2007 rr_AnnualReturn2007 3.21%
2008 rr_AnnualReturn2008 (5.97%)
2009 rr_AnnualReturn2009 17.22%
2010 rr_AnnualReturn2010 1.26%
2011 rr_AnnualReturn2011 9.67%
2012 rr_AnnualReturn2012 9.45%
2013 rr_AnnualReturn2013 (3.98%)
2014 rr_AnnualReturn2014 11.07%
2015 rr_AnnualReturn2015 2.86%
2016 rr_AnnualReturn2016 (0.14%)
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2017
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.27%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.02%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.75%)
Class T | Deutsche Managed Municipal Bond Fund | before tax | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.63%)
5 Years rr_AverageAnnualReturnYear05 3.17%
10 Years rr_AverageAnnualReturnYear10 3.98%
Class Inception rr_AverageAnnualReturnInceptionDate Mar. 31, 2017
Class T | Deutsche Managed Municipal Bond Fund | After tax on distributions | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.82%)
5 Years rr_AverageAnnualReturnYear05 1.83%
10 Years rr_AverageAnnualReturnYear10 3.29%
Class T | Deutsche Managed Municipal Bond Fund | After tax on distributions - with sale | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.20%)
5 Years rr_AverageAnnualReturnYear05 1.93%
10 Years rr_AverageAnnualReturnYear10 3.36%
Class T | Deutsche Managed Municipal Bond Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.25%
5 Years rr_AverageAnnualReturnYear05 3.28%
10 Years rr_AverageAnnualReturnYear10 4.25%
[1] "Other expenses" for Class T are based on estimated amounts for the current fiscal year.