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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE DWS SECURITIES TRUST
Prospectus Date rr_ProspectusDate Oct. 01, 2018
DWS Enhanced Commodity Strategy Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <p>DWS Enhanced Commodity Strategy Fund</p><p>(formerly Deutsche Enhanced Commodity Strategy Fund) </p>
Objective [Heading] rr_ObjectiveHeading <p>Investment Objective</p>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund's investment objective is total return.

Expense [Heading] rr_ExpenseHeading <p>Fees and Expenses of the Fund</p>
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 and your immediate family invest, or agree to invest in the future, at least $50,000 in Class A shares in DWS funds or if you invest at least $250,000 in Class T shares in the fund. More information about these and other discounts and waivers is available from your financial advisor and in Choosing a Share Class (p. 23), Sales Charge Waivers and Discounts Available Through Intermediaries (Appendix B, p. 58) 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 <br />(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, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <p>PORTFOLIO TURNOVER </p>
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 79% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 79.00%
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock

The Advisor has contractually agreed through September 30, 2019 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 1.33%, 1.33%, 2.08%, 0.95%, 0.99%, and 1.13% for Class A, Class T, Class C, Class R6, Institutional Class and Class S, respectively. The agreement may only be terminated with the consent of the fund's Board.
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 $50,000 in Class A shares in DWS funds or if you invest at least $250,000 in Class T shares in the fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 <p>Principal Investment Strategy</p>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Main investments. Under normal circumstances, the fund invests in commodity-linked derivative instruments backed by a portfolio of fixed income instruments. The fund invests in commodity-linked derivative instruments (a contract whose value is based on a particular commodity), such as commodity-linked swap contracts, commodity-linked structured notes, options and futures contracts, to gain exposure to the investment return of assets that trade in the commodity markets, without investing directly in physical commodities. Physical commodities are assets that have tangible properties such as gas, heating oil, industrial and other precious metals, livestock or agricultural products.

The fund may gain exposure to the commodity markets by investing up to 25% of the fund's total assets in a wholly-owned subsidiary formed under the laws of the Cayman Islands (the "Subsidiary"), which shares the same portfolio management team as the fund and is expected to invest mainly in commodity-linked derivative instruments and fixed income instruments, some of which may serve as margin or collateral for the Subsidiary's derivatives positions.

The fund invests in fixed income securities, including inflation-indexed securities, of varying maturities issued by the US government, non-US governments, their agencies or instrumentalities, and US and non-US corporations and derivatives related to each of these types of securities. The fund may invest in mortgage-backed and asset-backed securities, adjustable rate loans that have a senior right to payment ("senior loans") and other floating rate debt securities, taxable municipal bonds and tax-exempt municipal bonds.

The fund may invest up to 10% of its total assets in below investment grade fixed income securities (commonly referred to as junk bonds).

The fund concentrates its investments in commodities-related industries. The Advisor considers a company to be in a commodity-related industry if, as determined by the Advisor, at least 50% of the company's assets, revenues or net income are derived from or related to a commodity-related industry. Currently, the fund considers commodities-related industries to include oil, natural gas, agricultural products and metals industries; however, these criteria are provided for illustrative purposes only and are not part of the fund's fundamental investment policy regarding the concentration of its investments in any particular industry or group of industries. Accordingly, the fund may change the criteria it uses from time to time without shareholder approval.

Management process. Portfolio management generally will allocate the fund's commodity-linked investments among a variety of different commodity sectors. Portfolio management employs three main strategies with respect to its commodity-linked investments: a relative value strategy, a tactical strategy, and a "roll enhancement" strategy. In implementing the relative value strategy, portfolio management will use a proprietary quantitative, rules-based methodology in determining the fund's commodity sector weightings relative to the fund's benchmark index, the Bloomberg Commodity Index. Portfolio management normally will rebalance commodity sector positions when a sector undergoes a "trigger event," reducing the fund's exposure to commodity sectors that are believed to be "expensive" and increasing its exposure to sectors that are believed to be "cheap." The tactical strategy focuses on the direction of commodity markets as a whole. Portfolio management will use a proprietary, momentum-driven, quantitative formula that seeks to anticipate the direction of the commodity markets. Portfolio management may reduce the fund's exposure to all commodity sectors when commodities in general appear overvalued. In implementing the "roll enhancement" strategy, portfolio management seeks to invest in commodity contracts whose expiration is further out on the "commodity curve" than the subsequent month so as to avoid continually paying premiums to replace expiring contracts.

With respect to the fund's fixed income investments, portfolio management uses a relative value style to seek to construct a diversified portfolio of fixed income securities. With respect to these investments, portfolio management normally targets a dollar-weighted average portfolio duration of three years or less, and primarily invests in fixed income securities that are rated, at the time of purchase, within the top four credit rating categories as rated by Moody's Investors Service, Inc., Standard & Poor's Ratings Services, Fitch Ratings, or another Nationally Recognized Statistical Rating Organization, or, if unrated, are determined by the Advisor to be of similar quality.

Derivatives. In addition to commodity-linked derivative instruments, the fund may also use other types of derivatives (a contract whose value is based on, for example, indices, currencies or securities) (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.

Securities lending. The fund may lend securities (up to one-third of total assets) to approved institutions, such as registered broker-dealers, banks and pooled investment vehicles.

Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The fund concentrates its investments in commodities-related industries.
Risk [Heading] rr_RiskHeading <p>Main Risks</p>
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.

Commodities-related investments risk. The commodities-linked derivative instruments in which the fund invests tend to be more volatile than many other types of securities and may subject the fund to special risks that do not apply to all derivatives transactions. For example, the value of commodity-linked derivative instruments may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity, such as drought, floods, weather, livestock disease, changes in storage costs, embargoes, tariffs, policies of commodity cartels and international economic, political and regulatory developments.

The value of a commodity-linked derivative investment generally is based upon the price movements of a physical commodity (such as energy, minerals, or agricultural products), a futures contract, swap or commodity index, or other economic variables linked to changes in the value of commodities or the commodities markets. A liquid secondary market may not exist for the types of commodity-linked derivative instruments the fund buys, which may make it difficult for the fund to sell them at an acceptable price. The fund's ability to gain exposure to commodity-linked investments and achieve its investment objective may be limited by its intention to qualify as a regulated investment company under the Internal Revenue Code of 1986, as amended.

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 industries, companies, economic trends, the relative attractiveness of different securities or other matters.

Concentration risk. Any fund that concentrates in a particular segment of the market will generally be more volatile than a fund that invests more broadly. Any market price movements, regulatory or technological changes, or economic conditions affecting the particular segment of the market in which the fund concentrates may have a significant impact on the fund's performance.

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.

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.

Foreign investment risk. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments could undermine the value of the fund's investments or prevent the fund from realizing the full value of its investments. In June 2016, citizens of the United Kingdom approved a referendum to leave the European Union (EU) and in March 2017, the United Kingdom initiated its withdrawal from the EU, which is expected to take place by March 2019. Significant uncertainty exists regarding the United Kingdom's anticipated withdrawal from the EU and any adverse economic and political effects such withdrawal may have on the United Kingdom, other EU countries and the global economy.

Financial reporting standards for companies based in foreign markets differ from those in the US. Additionally, foreign securities markets generally are smaller and less liquid than US markets. To the extent that the fund invests in non-US dollar denominated foreign securities, changes in currency exchange rates may affect the US dollar value of foreign securities or the income or gain received on these securities.

Emerging markets risk. Foreign investment risks are greater in emerging markets than in developed markets. Investments in emerging markets are often considered speculative.

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.

Inflation-indexed bond risk. Any rise in interest rates may cause inflation-indexed bonds to decline in price, hurting fund performance. If interest rates rise due to reasons other than inflation, the fund's investment in these securities may not be fully protected from the effects of rising interest rates. The fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The performance of any bonds that are indexed to non-US rates of inflation may be higher or lower than those indexed to US inflation rates. The fund's actual returns could fail to match the real rate of inflation.

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.

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.

Securities lending risk. Any decline in the value of a portfolio security that occurs while the security is out on loan is borne by the fund and will adversely affect performance. Also, there may be delays in recovery of securities loaned or even a loss of rights in the collateral should the borrower of the securities fail financially while holding the security.

Senior loans risk. The fund invests in senior loans that may not be rated by a rating agency, registered with the Securities and Exchange Commission or any state securities commission or listed on any national securities exchange. Therefore, there may be less publicly available information about them than for registered or exchange-listed securities. The Advisor relies on its own evaluation of the creditworthiness of borrowers, but will consider, and may rely in part on, analyses performed by others. As a result, the fund is particularly dependent on the analytical abilities of the Advisor.

Senior loans may not be considered "securities," and purchasers, such as the fund, therefore may not be entitled to rely on the anti-fraud and misrepresentation protections of the federal securities laws. Senior loans involve other risks, including credit risk, interest rate risk, liquidity risk, and prepayment and extension risk.

Because affiliates of the Advisor may participate in the primary and secondary market for senior loans, limitations under applicable law may restrict the fund's ability to participate in a restructuring of a senior loan or to acquire some senior loans, or affect the timing or price of such acquisition. The fund also may be in possession of material non-public information about a borrower as a result of its ownership of a senior loan. Because of prohibitions on trading in securities of issuers while in possession of such information, the fund might be unable to enter into a transaction in a publicly-traded security of that borrower when it would otherwise be advantageous to do so. If the Advisor wishes to invest in the publicly traded securities of a borrower, it may not have access to material non-public information regarding the borrower to which other lenders have access.

Tax status risk. Income and gains from commodities or certain commodity-linked derivatives do not constitute "qualifying income" to the fund for purposes of qualification as a "regulated investment company" for federal income tax purposes. The Internal Revenue Service has issued a private ruling to the fund that income derived from the fund's investment in the Subsidiary will constitute qualifying income to the fund. Income from other commodity-linked derivatives in which the fund invests directly or indirectly may not constitute qualifying income. If such income were determined to cause the fund's nonqualifying income to exceed 10% of the fund's gross income, the fund would be subject to a tax at the fund level.

Subsidiary risk. The fund may invest in the Subsidiary, which is not registered as an investment company under the Investment Company Act of 1940, as amended, and therefore is not subject to all of the investor protections of the Investment Company Act of 1940. A regulatory change in the US or the Cayman Islands, under which the fund and the Subsidiary, respectively, are organized, that impacts the Subsidiary or how the fund invests in the Subsidiary, such as a change in tax law, could adversely affect the fund. By investing in the Subsidiary, the fund is exposed to the risks associated with the Subsidiary's investments, which generally include the risks of investing in derivatives and commodities-related investments.

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 <p>Past Performance</p>
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 phone number included in this prospectus.

Class T is a new class of shares and therefore does not have a full calendar year of performance available. The performance figures for Class T shares are based on the historical performance of the fund's Institutional Class shares adjusted to reflect the higher expenses and applicable sales charges of Class T.

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 therefore does not have a full calendar year of performance available. The performance figures for Class T shares are based on the historical performance of the fund's Institutional Class shares adjusted to reflect the higher expenses and applicable sales charges of Class T.
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 20.94% June 30, 2008
Worst Quarter -34.47% September 30, 2008
Year-to-Date -0.27% June 30, 2018

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns<br />(For periods ended 12/31/2017 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.
DWS Enhanced Commodity Strategy Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.86%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.24%
Other expenses rr_OtherExpensesOverAssets 0.33%
Total annual fund operating expenses rr_ExpensesOverAssets 1.43%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.10%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 1.33%
1 Year rr_ExpenseExampleYear01 $ 703
3 Years rr_ExpenseExampleYear03 992
5 Years rr_ExpenseExampleYear05 1,303
10 Years rr_ExpenseExampleYear10 2,181
1 Year rr_ExpenseExampleNoRedemptionYear01 703
3 Years rr_ExpenseExampleNoRedemptionYear03 992
5 Years rr_ExpenseExampleNoRedemptionYear05 1,303
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,181
2008 rr_AnnualReturn2008 (45.91%)
2009 rr_AnnualReturn2009 27.09%
2010 rr_AnnualReturn2010 18.80%
2011 rr_AnnualReturn2011 (8.92%)
2012 rr_AnnualReturn2012 (1.74%)
2013 rr_AnnualReturn2013 (7.27%)
2014 rr_AnnualReturn2014 (6.56%)
2015 rr_AnnualReturn2015 (17.14%)
2016 rr_AnnualReturn2016 10.49%
2017 rr_AnnualReturn2017 1.22%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.27%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.94%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (34.47%)
DWS Enhanced Commodity Strategy Fund | Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.86%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.18%
Other expenses rr_OtherExpensesOverAssets 0.32%
Total annual fund operating expenses rr_ExpensesOverAssets 1.36%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.03%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 1.33%
1 Year rr_ExpenseExampleYear01 $ 382
3 Years rr_ExpenseExampleYear03 667
5 Years rr_ExpenseExampleYear05 973
10 Years rr_ExpenseExampleYear10 1,842
1 Year rr_ExpenseExampleNoRedemptionYear01 382
3 Years rr_ExpenseExampleNoRedemptionYear03 667
5 Years rr_ExpenseExampleNoRedemptionYear05 973
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,842
DWS Enhanced Commodity Strategy Fund | Class C  
Risk/Return: 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%
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.86%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.31%
Total annual fund operating expenses rr_ExpensesOverAssets 2.17%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.09%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 2.08%
1 Year rr_ExpenseExampleYear01 $ 311
3 Years rr_ExpenseExampleYear03 670
5 Years rr_ExpenseExampleYear05 1,156
10 Years rr_ExpenseExampleYear10 2,496
1 Year rr_ExpenseExampleNoRedemptionYear01 211
3 Years rr_ExpenseExampleNoRedemptionYear03 670
5 Years rr_ExpenseExampleNoRedemptionYear05 1,156
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,496
DWS Enhanced Commodity Strategy Fund | Class R6  
Risk/Return: 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
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.86%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 1.07%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.12%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.95%
1 Year rr_ExpenseExampleYear01 $ 97
3 Years rr_ExpenseExampleYear03 328
5 Years rr_ExpenseExampleYear05 578
10 Years rr_ExpenseExampleYear10 1,295
1 Year rr_ExpenseExampleNoRedemptionYear01 97
3 Years rr_ExpenseExampleNoRedemptionYear03 328
5 Years rr_ExpenseExampleNoRedemptionYear05 578
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,295
DWS Enhanced Commodity Strategy Fund | INST Class  
Risk/Return: 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
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.86%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.13%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.14%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.99%
1 Year rr_ExpenseExampleYear01 $ 101
3 Years rr_ExpenseExampleYear03 345
5 Years rr_ExpenseExampleYear05 609
10 Years rr_ExpenseExampleYear10 1,362
1 Year rr_ExpenseExampleNoRedemptionYear01 101
3 Years rr_ExpenseExampleNoRedemptionYear03 345
5 Years rr_ExpenseExampleNoRedemptionYear05 609
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,362
DWS Enhanced Commodity Strategy Fund | Class S  
Risk/Return: 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
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.86%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.33%
Total annual fund operating expenses rr_ExpensesOverAssets 1.19%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.06%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 1.13%
1 Year rr_ExpenseExampleYear01 $ 115
3 Years rr_ExpenseExampleYear03 372
5 Years rr_ExpenseExampleYear05 649
10 Years rr_ExpenseExampleYear10 1,438
1 Year rr_ExpenseExampleNoRedemptionYear01 115
3 Years rr_ExpenseExampleNoRedemptionYear03 372
5 Years rr_ExpenseExampleNoRedemptionYear05 649
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,438
DWS Enhanced Commodity Strategy Fund | before tax | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.60%)
5 Years rr_AverageAnnualReturnYear05 (5.42%)
10 Years rr_AverageAnnualReturnYear10 (5.75%)
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | before tax | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.41%)
5 Years rr_AverageAnnualReturnYear05 (4.85%)
10 Years rr_AverageAnnualReturnYear10 (5.46%)
Class Inception rr_AverageAnnualReturnInceptionDate Jun. 05, 2017
DWS Enhanced Commodity Strategy Fund | before tax | Class C  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.48%
5 Years rr_AverageAnnualReturnYear05 (5.02%)
10 Years rr_AverageAnnualReturnYear10 (5.89%)
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | before tax | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.58%
Since Inception rr_AverageAnnualReturnSinceInception 1.84%
Class Inception rr_AverageAnnualReturnInceptionDate Jun. 01, 2016
DWS Enhanced Commodity Strategy Fund | before tax | INST Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.54%
5 Years rr_AverageAnnualReturnYear05 (4.01%)
10 Years rr_AverageAnnualReturnYear10 (4.88%)
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | before tax | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.41%
5 Years rr_AverageAnnualReturnYear05 (4.13%)
10 Years rr_AverageAnnualReturnYear10 (5.01%)
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | After tax on distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.64%)
5 Years rr_AverageAnnualReturnYear05 (6.28%)
10 Years rr_AverageAnnualReturnYear10 (8.39%)
DWS Enhanced Commodity Strategy Fund | After tax on distributions and sale of fund shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.60%)
5 Years rr_AverageAnnualReturnYear05 (4.36%)
10 Years rr_AverageAnnualReturnYear10 (3.34%)
DWS Enhanced Commodity Strategy Fund | Bloomberg Commodity Index (reflects no deduction for fees, expenses or taxes) | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.70%
Since Inception rr_AverageAnnualReturnSinceInception 2.83%
DWS Enhanced Commodity Strategy Fund | Bloomberg Commodity Index (reflects no deduction for fees, expenses or taxes) | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.70%
5 Years rr_AverageAnnualReturnYear05 (8.45%)
10 Years rr_AverageAnnualReturnYear10 (6.83%)