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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE DWS SECURITIES TRUST
Prospectus Date rr_ProspectusDate Oct. 01, 2018
Class T | DWS Health and Wellness Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <p>DWS Health and Wellness Fund</p><p>(formerly Deutsche Health and Wellness Fund) </p>
Objective [Heading] rr_ObjectiveHeading <p>Investment Objective</p>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital.

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 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 Fund section (p. 11) and in 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)
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 27% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 27.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates <p> <sup>1</sup> "Other expenses" for Class T are based on estimated amounts for the current fiscal year. </p>
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 remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading <p>Principal Investment Strategy</p>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Main investments. Under normal circumstances, the fund will invest at least 80% of net assets, plus the amount of any borrowings for investment purposes, in equity securities of companies in the health care and wellness sectors. For purposes of the fund's 80% investment policy, to be considered part of the health care or wellness sectors, companies must commit at least half of their assets to, or derive at least half of their revenues or net income from, that sector. Industries in the health care sector include pharmaceuticals, biotechnology, medical products and supplies, and health care services. Portfolio management considers wellness-related companies to include companies in the health care industry and other companies that provide products or services that promote or aid in achieving a healthy lifestyle (for example, healthy food and nutrition companies and gym operators). The fund concentrates its assets (i.e. invests at least 25% of its net assets) in securities related to the health care sector.

The fund invests primarily in securities of US companies, but may invest in foreign companies as well. The fund may invest in companies of any size. While the fund invests mainly in common stocks, it may also invest up to 20% of total assets in US Treasury and US agency debt obligations.

Management process. In choosing stocks, portfolio management uses a combination of three analytical disciplines:

Bottom-up research. Portfolio management looks for individual companies with a history of above-average growth, strong competitive positioning, new tests or treatments, the ability to take advantage of demographic trends, attractive prices relative to potential growth, sound financial strength and effective management, among other factors.

Growth orientation. Portfolio management generally looks for companies that it believes have above-average potential for sustainable growth of revenue or earnings and whose market value appears reasonable in light of their business prospects.

Top-down analysis. Portfolio management considers the economic outlook for various industries within the health care sector while looking for those that it believes may benefit from changes in the overall business environment.

Portfolio management may favor securities from different industries and companies within the health care sector at different times. Portfolio management will normally sell a stock when it believes the stock's price is unlikely to go higher, its fundamental factors have changed, other investments offer better opportunities, or in the course of adjusting their emphasis on a given health care industry.

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 assets (i.e. invests at least 25% of its net assets) in securities related to the health care sector.
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.

Stock market risk. When stock prices fall, you should expect the value of your investment to fall as well. Stock prices can be hurt by poor management on the part of the stock's issuer, shrinking product demand and other business risks. These may affect single companies as well as groups of companies. The market as a whole may not favor the types of investments the fund makes, which could adversely affect a stock's price, regardless of how well the company performs, or the fund's ability to sell a stock at an attractive price. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility which could negatively affect performance. Further, geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes and related geopolitical events have led, and in the future may lead, to increased short-term market volatility, which may disrupt securities markets and have adverse long-term effects on U.S. and world economies and markets. To the extent the fund invests in a particular capitalization or sector, the fund's performance may be affected by the general performance of that particular capitalization or sector.

Health care securities risk. Because the fund concentrates its investments in companies in the health care sector, and may invest to a significant extent in the wellness sector, it may be vulnerable to setbacks in those industries. Health care companies may be negatively affected by scientific or technological developments, research and development costs, increased competition within the health care industry, rapid product obsolescence and patent expirations. The price of securities of health care companies may fluctuate widely due to changes in legislation or other government regulations, including uncertainty regarding health care reform and its long term impact, reductions in government funding and the unpredictability of winning government approvals. Moreover, many health care companies are subject to product liability or other litigation which may have a significant impact on a company's market value or share price.

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.

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.

Growth investing risk. As a category, growth stocks may underperform value stocks (and the stock market as a whole) over any period of time. Because the prices of growth stocks are based largely on the expectation of future earnings, growth stock prices can decline rapidly and significantly in reaction to negative news about such factors as earnings, the economy, political developments, or other news.

Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Because stock analysts are less likely to follow small companies, less information about them is available to investors. Industry-wide reversals may have a greater impact on small companies, since they may lack the financial resources of larger companies. Small company stocks are typically less liquid than large company stocks.

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.

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.

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.

IPO risk. Prices of securities bought in an initial public offering (IPO) may rise and fall rapidly, often because of investor perceptions rather than economic reasons. To the extent a mutual fund is small in size, its IPO investments may have a significant impact on its performance since they may represent a larger proportion of the fund's overall portfolio as compared to the portfolio of a larger fund.

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.

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.

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 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 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 therefore does not have a full calendar year of performance available.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Advisor believes the additional index (MSCI World Health Care Index) reasonably represents the fund's overall investment process.
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 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 15.30% March 31, 2013
Worst Quarter -16.42% December 31, 2008
Year-to-Date 4.27% 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 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.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The Advisor believes the additional index (MSCI World Health Care Index) reasonably represents the fund's overall investment process.

Class T | DWS Health and Wellness 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 0.77%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.35% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.37%
1 Year rr_ExpenseExampleYear01 $ 386
3 Years rr_ExpenseExampleYear03 673
5 Years rr_ExpenseExampleYear05 981
10 Years rr_ExpenseExampleYear10 $ 1,855
2008 rr_AnnualReturn2008 (23.42%)
2009 rr_AnnualReturn2009 21.62%
2010 rr_AnnualReturn2010 7.63%
2011 rr_AnnualReturn2011 8.20%
2012 rr_AnnualReturn2012 17.69%
2013 rr_AnnualReturn2013 46.72%
2014 rr_AnnualReturn2014 26.60%
2015 rr_AnnualReturn2015 6.58%
2016 rr_AnnualReturn2016 (10.44%)
2017 rr_AnnualReturn2017 19.00%
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 4.27%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.30%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.42%)
Class T | DWS Health and Wellness Fund | before tax | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.03%
5 Years rr_AverageAnnualReturnYear05 15.52%
10 Years rr_AverageAnnualReturnYear10 10.14%
Class Inception rr_AverageAnnualReturnInceptionDate Mar. 31, 2017
Class T | DWS Health and Wellness Fund | After tax on distributions | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.30%
5 Years rr_AverageAnnualReturnYear05 13.43%
10 Years rr_AverageAnnualReturnYear10 8.69%
Class T | DWS Health and Wellness Fund | After tax on distributions - with sale | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.22%
5 Years rr_AverageAnnualReturnYear05 12.16%
10 Years rr_AverageAnnualReturnYear10 8.17%
Class T | DWS Health and Wellness Fund | Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.79%
10 Years rr_AverageAnnualReturnYear10 8.50%
Class T | DWS Health and Wellness Fund | MSCI World Health Care Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 19.80%
5 Years rr_AverageAnnualReturnYear05 13.88%
10 Years rr_AverageAnnualReturnYear10 8.94%
[1] "Other expenses" for Class T are based on estimated amounts for the current fiscal year.