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Label Element Value
Risk Return Abstract rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Oct. 01, 2020
Class ACIS | DWS Strategic High Yield Tax-Free Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading DWS Strategic High Yield Tax-Free Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks to provide a high level of income exempt from regular federal income tax.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

These are the fees and expenses you may pay when you buy, hold and sell shares. 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 immediate family invest, or agree to invest in the future, at least $100,000 in DWS funds. More information about these and other discounts and waivers is available from your financial representative and in Choosing a Share Class (p. 36), Sales Charge Waivers and Discounts Available Through Intermediaries (Appendix B, p. 73) and Purchase and Redemption of Shares in the fund's Statement of Additional Information (SAI) (p. II-15).
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, 2021
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. During the most recent fiscal year, the fund's portfolio turnover rate was 52% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.00%
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock

The Advisor has contractually agreed through September 30, 2021 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, interest expense and acquired fund fees and expenses) at 0.83%, 1.58%, 0.58% and 0.58% for Class A, Class C, Institutional Class and Class S, respectively. The agreement may only be terminated with the consent of the fund's Board.
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments of $250,000 or more may be eligible to buy Class A shares without a sales charge (load), but may be subject to a contingent deferred sales charge of 1.00% if redeemed within 12 months of the original purchase date.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $100,000 in DWS funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent “Management fee” is restated to reflect the fund’s new management fee rate effective October 1, 2019.
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:
Expense Example, No Redemption Narrative [Text Block] rr_ExpenseExampleNoRedemptionNarrativeTextBlock You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Main investments. Under normal circumstances, the fund invests at least 80% of net assets 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 50% of total assets in municipal securities rated in the four highest credit rating categories. The fund may invest up to 50% of total assets in high yield debt securities (commonly referred to as junk bonds), which are those below the fourth highest credit rating category (i.e., grade BB/Ba and below) and may include debt securities not currently paying interest and debt securities in default. 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.

Portfolio management may consider information about Environmental, Social and Governance (ESG) issues in its fundamental research process.
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 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.) Recent and potential future changes in monetary policy made by central banks or governments are likely to affect the level of interest rates. Rising interest rates may prompt redemptions from the fund, which may force the fund to sell investments at a time when it is not advantageous to do so, which could result in losses. The fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. In addition, in response to the COVID-19 pandemic, as with other serious economic disruptions, governmental authorities and regulators are enacting significant fiscal and monetary policy changes, including providing direct capital infusions into companies, creating new monetary programs and lowering interest rates considerably. These actions present heightened risks to debt instruments, and such risks could be even further heightened if these actions are unexpectedly or suddenly reversed or are ineffective in achieving their desired outcomes.

London Interbank Offered Rate (LIBOR), the benchmark rate for certain floating rate securities, is expected to be phased out by the end of 2021. The fund or the instruments in which the fund invests may be adversely affected by the phase out by, among other things, increased volatility or illiquidity. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement reference rate and, accordingly, it is difficult to predict the impact to the fund of the transition away from LIBOR.

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.

Because securities in default generally have missed one or more payments of interest and/or principal, an investment in such securities has an increased risk of loss. Issuers of securities in default have an increased likelihood of entering bankruptcy or beginning liquidation procedures which could impact the fund's ability to recoup its investment. Securities in default may be illiquid or trade in low volumes and thus may be difficult to value.

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.

High yield debt securities risk. High yield debt securities, or junk bonds, are generally regarded as speculative with respect to the issuer's continuing ability to meet principal and interest payments. High yield debt securities' total return and yield may generally be expected to fluctuate more than the total return and yield of investment-grade debt securities. A real or perceived economic downturn or an increase in market interest rates could cause a decline in the value of high yield debt securities, result in increased redemptions and/or result in increased portfolio turnover, which could result in a decline in net asset value of the fund, reduce liquidity for certain investments and/or increase costs. High yield debt securities are often thinly traded and can be more difficult to sell and value accurately than investment-grade debt securities as there may be no established secondary market. Investments in high yield debt securities could increase liquidity risk for the fund. In addition, the market for high yield debt securities can experience sudden and sharp volatility which is generally associated more with investments in stocks.

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. Municipal instruments may be susceptible to periods of economic stress, which could affect the market values and marketability of many or all municipal obligations of issuers in a state, US territory, or possession. For example, the COVID-19 pandemic has significantly stressed the financial resources of many municipal issuers, which may impair a municipal issuer's ability to meet its financial obligations when due and could adversely impact the value of its bonds, which could negatively impact the performance of the fund. The fund could also 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. Municipal securities may include revenue bonds, which are generally backed by revenue from a specific project or tax. The issuer of a revenue bond makes interest and principal payments from revenues generated from a particular source or facility, such as a tax on particular property or revenues generated from a municipal water or sewer utility or an airport. Revenue bonds generally are not backed by the full faith and credit and general taxing power of the issuer. The value of municipal securities is strongly influenced by the value of tax-exempt income to investors. Changes in tax and other laws, including changes to individual or corporate tax rates, could alter the attractiveness and overall demand for municipal securities.

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.

Market disruption risk. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, public health crises and related geopolitical events have led, and in the future may lead, to disruptions in the US and world economies and markets, which may increase financial market volatility and have significant adverse direct or indirect effects on the fund and its investments. Market disruptions could cause the fund to lose money, experience significant redemptions, and encounter operational difficulties. Although multiple asset classes may be affected by a market disruption, the duration and effects may not be the same for all types of assets.

Recent market disruption events include the pandemic spread of the novel coronavirus known as COVID-19, and the significant uncertainty, market volatility, decreased economic and other activity and increased government activity that it has caused. Specifically, COVID-19 has led to significant death and morbidity, and concerns about its further spread have resulted in the closing of schools and non-essential businesses, cancellations, shelter-in-place orders, lower consumer spending in certain sectors, social distancing, bans on large social gatherings and travel, quarantines, government economic stimulus measures, reduced productivity, rapid increases in unemployment, increased demand for and strain on government and medical resources, border closings and global trade and supply chain interruptions, among others. The full effects, duration and costs of the COVID-19 pandemic are impossible to predict, and the circumstances surrounding the COVID-19 pandemic will continue to evolve. The pandemic may affect certain countries, industries, economic sectors, companies and investment products more than others, may exacerbate existing economic, political, or social tensions and may increase the probability of an economic recession or depression. The fund and its investments may be adversely affected by the effects of the COVID-19 pandemic, and a prolonged pandemic may result in the fund and its service providers experiencing operational difficulties in coordinating a remote workforce and implementing their business continuity plans, among others.

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.

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 such event, the value of such securities would likely fall, hurting fund performance and shareholders may be required to pay additional taxes. 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 may incur 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. For example, the fund's or its service providers' assets or sensitive or confidential information may be misappropriated, data may be corrupted and operations may be disrupted (e.g., cyber-attacks, operational failures or broader disruptions may cause the release of private shareholder information or confidential fund information, interfere with the processing of shareholder transactions, impact the ability to calculate the fund's net asset value and impede trading). Market events and disruptions also may trigger a volume of transactions that overloads current information technology and communication systems and processes, impacting the ability to conduct the fund's operations.

While the fund and its service providers may establish business continuity and other plans and processes that seek to address the possibility of and fallout from cyber-attacks, disruptions or failures, there are inherent limitations in such plans and systems, including that they do not apply to third parties, such as fund counterparties, issuers of securities held by the fund or other market participants, as well as the possibility that certain risks have not been identified or that unknown threats may emerge in the future and there is no assurance that such plans and processes will be effective. Among other situations, disruptions (for example, pandemics or health crises) that cause prolonged periods of remote work or significant employee absences at the fund's service providers could impact the ability to conduct the fund's operations. In addition, the fund cannot directly control any cybersecurity plans and systems put in place by its service providers, fund counterparties, issuers of securities held by the fund or other market participants.
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 dws.com (the Web site does not form a part of this prospectus) or call the telephone number included in this 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 Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress dws.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 A)
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 5.34% June 30, 2011
Worst Quarter -5.30% December 31, 2010
Year-to-Date -2.44% June 30, 2020

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(For periods ended 12/31/2019 expressed as a %)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns (which are shown only for Class A and would be different for other classes) 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 (which are shown only for Class A and would be different for other classes)
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns (which are shown only for Class A and would be different for other classes) 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 ACIS | DWS Strategic High Yield Tax-Free Fund | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.75%
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none [1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.40% [2]
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.24%
Interest expense rr_Component1OtherExpensesOverAssets 0.06%
Other expenses rr_Component3OtherExpensesOverAssets 0.23%
Total other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 0.93%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.04%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.89%
1 Year rr_ExpenseExampleYear01 $ 363
3 Years rr_ExpenseExampleYear03 559
5 Years rr_ExpenseExampleYear05 772
10 Years rr_ExpenseExampleYear10 1,383
1 Year rr_ExpenseExampleNoRedemptionYear01 363
3 Years rr_ExpenseExampleNoRedemptionYear03 559
5 Years rr_ExpenseExampleNoRedemptionYear05 772
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,383
2010 rr_AnnualReturn2010 2.32%
2011 rr_AnnualReturn2011 9.78%
2012 rr_AnnualReturn2012 12.18%
2013 rr_AnnualReturn2013 (5.84%)
2014 rr_AnnualReturn2014 11.57%
2015 rr_AnnualReturn2015 3.35%
2016 rr_AnnualReturn2016 1.01%
2017 rr_AnnualReturn2017 6.26%
2018 rr_AnnualReturn2018 (0.80%)
2019 rr_AnnualReturn2019 8.37%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (2.44%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.34%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.30%)
Class ACIS | DWS Strategic High Yield Tax-Free Fund | Class C  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.40% [2]
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Interest expense rr_Component1OtherExpensesOverAssets 0.06%
Other expenses rr_Component3OtherExpensesOverAssets 0.23%
Total other expenses rr_OtherExpensesOverAssets 0.29%
Total annual fund operating expenses rr_ExpensesOverAssets 1.69%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.05%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 1.64%
1 Year rr_ExpenseExampleYear01 $ 267
3 Years rr_ExpenseExampleYear03 528
5 Years rr_ExpenseExampleYear05 913
10 Years rr_ExpenseExampleYear10 1,994
1 Year rr_ExpenseExampleNoRedemptionYear01 167
3 Years rr_ExpenseExampleNoRedemptionYear03 528
5 Years rr_ExpenseExampleNoRedemptionYear05 913
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,994
Class ACIS | DWS Strategic High Yield Tax-Free Fund | INST Class  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none [1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.40% [2]
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Interest expense rr_Component1OtherExpensesOverAssets 0.06%
Other expenses rr_Component3OtherExpensesOverAssets 0.26%
Total other expenses rr_OtherExpensesOverAssets 0.32%
Total annual fund operating expenses rr_ExpensesOverAssets 0.72%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.08%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.64%
1 Year rr_ExpenseExampleYear01 $ 65
3 Years rr_ExpenseExampleYear03 222
5 Years rr_ExpenseExampleYear05 393
10 Years rr_ExpenseExampleYear10 887
1 Year rr_ExpenseExampleNoRedemptionYear01 65
3 Years rr_ExpenseExampleNoRedemptionYear03 222
5 Years rr_ExpenseExampleNoRedemptionYear05 393
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 887
Class ACIS | DWS Strategic High Yield Tax-Free Fund | Class S  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none [1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.40% [2]
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Interest expense rr_Component1OtherExpensesOverAssets 0.06%
Other expenses rr_Component3OtherExpensesOverAssets 0.32%
Total other expenses rr_OtherExpensesOverAssets 0.38%
Total annual fund operating expenses rr_ExpensesOverAssets 0.78%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.14%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.64%
1 Year rr_ExpenseExampleYear01 $ 65
3 Years rr_ExpenseExampleYear03 235
5 Years rr_ExpenseExampleYear05 420
10 Years rr_ExpenseExampleYear10 953
1 Year rr_ExpenseExampleNoRedemptionYear01 65
3 Years rr_ExpenseExampleNoRedemptionYear03 235
5 Years rr_ExpenseExampleNoRedemptionYear05 420
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 953
Class ACIS | DWS Strategic High Yield Tax-Free Fund | before tax | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.39%
5 Years rr_AverageAnnualReturnYear05 3.01%
10 Years rr_AverageAnnualReturnYear10 4.38%
Class Inception rr_AverageAnnualReturnInceptionDate May 01, 2000
Class ACIS | DWS Strategic High Yield Tax-Free Fund | before tax | Class C  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.55%
5 Years rr_AverageAnnualReturnYear05 2.81%
10 Years rr_AverageAnnualReturnYear10 3.89%
Class Inception rr_AverageAnnualReturnInceptionDate May 01, 2000
Class ACIS | DWS Strategic High Yield Tax-Free Fund | before tax | INST Class  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.64%
5 Years rr_AverageAnnualReturnYear05 3.82%
10 Years rr_AverageAnnualReturnYear10 4.93%
Class Inception rr_AverageAnnualReturnInceptionDate Aug. 19, 2002
Class ACIS | DWS Strategic High Yield Tax-Free Fund | before tax | Class S  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.63%
5 Years rr_AverageAnnualReturnYear05 3.84%
10 Years rr_AverageAnnualReturnYear10 4.93%
Class Inception rr_AverageAnnualReturnInceptionDate Jan. 22, 1987
Class ACIS | DWS Strategic High Yield Tax-Free Fund | After tax on distributions | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.38%
5 Years rr_AverageAnnualReturnYear05 2.96%
10 Years rr_AverageAnnualReturnYear10 4.36%
Class ACIS | DWS Strategic High Yield Tax-Free Fund | After tax on distributions and sale of fund shares | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.63%
5 Years rr_AverageAnnualReturnYear05 3.16%
10 Years rr_AverageAnnualReturnYear10 4.37%
Class ACIS | DWS Strategic High Yield Tax-Free Fund | Bloomberg Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.54%
5 Years rr_AverageAnnualReturnYear05 3.53%
10 Years rr_AverageAnnualReturnYear10 4.34%
[1] Investments of $250,000 or more may be eligible to buy Class A shares without a sales charge (load), but may be subject to a contingent deferred sales charge of 1.00% if redeemed within 12 months of the original purchase date.
[2] "Management fee" is restated to reflect the fund's new management fee rate effective October 1, 2019.