485BPOS

Filed electronically with the Securities and Exchange Commission on October 10, 2013

File No. 002-36238

  File No. 811-02021

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	| X |
Pre-Effective Amendment No.  ___	|__|
Post-Effective Amendment No. 129	| X |
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	| X |
Amendment No. 113
DWS Securities Trust (Exact Name of Registrant as Specified in Charter)
345 Park Avenue, New York, NY  10154 (Address of Principal Executive Offices)   (Zip Code)
Registrant’s Telephone Number, including Area Code:  (617) 295-1000
John Millette Vice President and Secretary One Beacon Street Boston, MA 02108 (Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

/ X /	Immediately upon filing pursuant to paragraph (b)
/___/	On ______________ pursuant to paragraph (b)
/___/	60 days after filing pursuant to paragraph (a)(1)
/___/	On ______________ pursuant to paragraph (a)(1)
/___/	75 days after filing pursuant to paragraph (a)(2)
/___/	On _______________pursuant to paragraph (a)(2) of Rule 485
	If appropriate, check the following box:
/___/	This post-effective amendment designates a new effective date for a previously filed post-effective amendment

This filing relates solely to the following Funds, each a series of the Registrant:

·   DWS Enhanced Commodity Strategy Fund — Class  A, Class B, Class C, Institutional Class and Class S

·   DWS Health Care Fund — Class A, Class B, Class C, Institutional Class and Class S

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this amendment to its Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized, in the City of New York and the State of New York on the 7th day of October 2013.

DWS SECURITIES TRUST

By:  /s/Robert Kendall

Robert Kendall*

President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

SIGNATURE	TITLE		DATE
/s/Robert Kendall
Robert Kendall*		President		October 7, 2013
/s/Paul H. Schubert
Paul H. Schubert		Chief Financial Officer and Treasurer		October 7, 2013
/s/John W. Ballantine
John W. Ballantine*		Trustee		October 7, 2013
/s/Henry P. Becton, Jr.
Henry P. Becton, Jr.*		Trustee		October 7, 2013
/s/Dawn-Marie Driscoll
Dawn-Marie Driscoll*		Trustee		October 7, 2013
/s/Keith R. Fox
Keith R. Fox*		Trustee		October 7, 2013
/s/Paul K. Freeman
Paul K. Freeman*		Trustee		October 7, 2013
/s/Kenneth C. Froewiss
Kenneth C. Froewiss*		Chairperson and Trustee		October 7, 2013
/s/Richard J. Herring
Richard J. Herring*		Trustee		October 7, 2013
/s/William McClayton
William McClayton*		Vice Chairperson and Trustee		October 7, 2013
/s/Rebecca W. Rimel
Rebecca W. Rimel*		Trustee		October 7, 2013
/s/William N. Searcy, Jr.
William N. Searcy, Jr.*		Trustee		October 7, 2013
/s/Jean Gleason Stromberg
Jean Gleason Stromberg*		Trustee		October 7, 2013
/s/Robert H. Wadsworth
Robert H. Wadsworth*		Trustee		October 7, 2013

*By:           

/s/Caroline Pearson

Caroline Pearson **

Chief Legal Officer

** Attorney-in-fact pursuant to the powers of attorney that are incorporated herein by reference to Post-Effective Amendment No. 128 to the Registration Statement as filed on October 9, 2013; and as filed on September 26, 2008 in Post-Effective Amendment No.100 to the Registration Statement.

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS SECURITIES TRUST
Prospectus Date	rr_ProspectusDate	Oct. 01, 2013
DWS Health Care Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Health Care Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These are the fees and expenses you may pay when you buy and hold shares. You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in DWS funds. More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 19) 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, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance. Portfolio turnover rate for fiscal year 2013: 40%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	40.00%
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	The Advisor has contractually agreed through September 30, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at 1.34%, 2.09%, 2.09%, 1.09% and 1.09% (excluding extraordinary expenses, taxes, brokerage and interest expenses) for Class A, Class B, Class C, 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 DWS funds.
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:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. The fund concentrates its assets in securities related to the health care sector. Under normal circumstances, the fund will invest at least 80% of total assets in common stock of companies in the health care sector. For purposes of the fund's 80% investment policy, to be considered part of the health care sector, companies must commit at least half of their assets to, or derive at least half of the revenues or net income from, that sector. Industries in the health care sector include pharmaceuticals, biotechnology, medical products and supplies, and health care services. 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.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	The fund concentrates its assets in securities related to the health care sector.
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. Stock market risk. The fund is affected by how the stock market performs. When stock prices fall, you should expect the value of your investment to fall as well. 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. Because the fund concentrates its investments in companies in the health care sector, it may be vulnerable to setbacks in that industry. In particular, health care companies can be affected by rapid product obsolescence and the unpredictability of winning government approvals. 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. 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. 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. 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. 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 in an orderly fashion at an acceptable price. 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 than 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.
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 were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone 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 Additional Market Index [Text]	rr_PerformanceAdditionalMarketIndex	The Advisor believes the additional index (S&P North American Health Care Sector Index) represents the fund's overall investment process.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.dws-investments.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	Best Quarter: 15.04%, Q2 2003 Worst Quarter: -16.51%, Q4 2008 Year-to-Date as of 6/30/2013: 19.44%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (For periods ended 12/31/2012 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.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	The Advisor believes the additional index (S&P North American Health Care Sector Index) represents the fund's overall investment process.
DWS Health Care 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
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.77%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.24%
Other expenses	rr_OtherExpensesOverAssets	0.44%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.45%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.11%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.34%
1 Year	rr_ExpenseExampleYear01	704
3 Years	rr_ExpenseExampleYear03	997
5 Years	rr_ExpenseExampleYear05	1,312
10 Years	rr_ExpenseExampleYear10	2,202
1 Year	rr_ExpenseExampleNoRedemptionYear01	704
3 Years	rr_ExpenseExampleNoRedemptionYear03	997
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,312
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,202
2003	rr_AnnualReturn2003	32.97%
2004	rr_AnnualReturn2004	9.06%
2005	rr_AnnualReturn2005	7.83%
2006	rr_AnnualReturn2006	5.47%
2007	rr_AnnualReturn2007	12.43%
2008	rr_AnnualReturn2008	(23.63%)
2009	rr_AnnualReturn2009	21.21%
2010	rr_AnnualReturn2010	7.34%
2011	rr_AnnualReturn2011	8.13%
2012	rr_AnnualReturn2012	17.60%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-Date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2013
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	19.44%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	15.04%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(16.51%)
DWS Health Care Fund | Class B
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	4.00%
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.77%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.58%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.35%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.26%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.09%
1 Year	rr_ExpenseExampleYear01	612
3 Years	rr_ExpenseExampleYear03	1,009
5 Years	rr_ExpenseExampleYear05	1,432
10 Years	rr_ExpenseExampleYear10	2,234
1 Year	rr_ExpenseExampleNoRedemptionYear01	212
3 Years	rr_ExpenseExampleNoRedemptionYear03	709
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,232
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,234
DWS Health Care 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%
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.77%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.41%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.18%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.09%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.09%
1 Year	rr_ExpenseExampleYear01	312
3 Years	rr_ExpenseExampleYear03	673
5 Years	rr_ExpenseExampleYear05	1,161
10 Years	rr_ExpenseExampleYear10	2,506
1 Year	rr_ExpenseExampleNoRedemptionYear01	212
3 Years	rr_ExpenseExampleNoRedemptionYear03	673
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,161
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,506
DWS Health Care 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
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.77%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.38%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.15%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.06%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.09%
1 Year	rr_ExpenseExampleYear01	111
3 Years	rr_ExpenseExampleYear03	359
5 Years	rr_ExpenseExampleYear05	627
10 Years	rr_ExpenseExampleYear10	1,392
1 Year	rr_ExpenseExampleNoRedemptionYear01	111
3 Years	rr_ExpenseExampleNoRedemptionYear03	359
5 Years	rr_ExpenseExampleNoRedemptionYear05	627
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,392
DWS Health Care 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
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.77%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.41%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.18%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.09%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.09%
1 Year	rr_ExpenseExampleYear01	111
3 Years	rr_ExpenseExampleYear03	366
5 Years	rr_ExpenseExampleYear05	640
10 Years	rr_ExpenseExampleYear10	1,424
1 Year	rr_ExpenseExampleNoRedemptionYear01	111
3 Years	rr_ExpenseExampleNoRedemptionYear03	366
5 Years	rr_ExpenseExampleNoRedemptionYear05	640
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,424
DWS Health Care Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	10.83%
5 Years	rr_AverageAnnualReturnYear05	3.55%
10 Years	rr_AverageAnnualReturnYear10	8.24%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 29, 2000
DWS Health Care Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	13.66%
5 Years	rr_AverageAnnualReturnYear05	3.81%
10 Years	rr_AverageAnnualReturnYear10	8.01%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 29, 2000
DWS Health Care Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.69%
5 Years	rr_AverageAnnualReturnYear05	4.01%
10 Years	rr_AverageAnnualReturnYear10	8.05%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 29, 2000
DWS Health Care Fund | before tax | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	17.98%
5 Years	rr_AverageAnnualReturnYear05	5.27%
10 Years	rr_AverageAnnualReturnYear10	9.33%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 29, 2000
DWS Health Care Fund | before tax | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	17.90%
5 Years	rr_AverageAnnualReturnYear05	5.08%
10 Years	rr_AverageAnnualReturnYear10	9.16%
Class Inception	rr_AverageAnnualReturnInceptionDate	Mar. 02, 1998
DWS Health Care Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.33%
5 Years	rr_AverageAnnualReturnYear05	2.68%
10 Years	rr_AverageAnnualReturnYear10	7.55%
DWS Health Care Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.09%
5 Years	rr_AverageAnnualReturnYear05	2.86%
10 Years	rr_AverageAnnualReturnYear10	7.16%
DWS Health Care 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	16.00%
5 Years	rr_AverageAnnualReturnYear05	1.66%
10 Years	rr_AverageAnnualReturnYear10	7.10%
DWS Health Care Fund | S&P North American Health Care Sector Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	19.78%
5 Years	rr_AverageAnnualReturnYear05	5.83%
10 Years	rr_AverageAnnualReturnYear10	8.32%

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DWS Health Care Fund

DWS Health Care Fund

Investment Objective

The fund seeks long-term growth of capital.

Fees and Expenses of the Fund

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 DWS funds. More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 19) and Purchase and Redemption of Shares in the fund's Statement of Additional Information (SAI) (p. II-15).

SHAREHOLDER FEES (paid directly from your investment)

Shareholder Fees DWS Health Care Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
Maximum sales charge (load) imposed on purchases, as % of offering price	5.75%	none	none	none	none
Maximum deferred sales charge (load), as % of redemption proceeds	none	4.00%	1.00%	none	none
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	2.00%	2.00%	2.00%	2.00%	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	20	20	20	none	20

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a % of the value of your investment)

Annual Fund Operating Expenses DWS Health Care Fund	Class A	Class B	Class C	INST Class	Class S
Management fee	0.77%	0.77%	0.77%	0.77%	0.77%
Distribution/service (12b-1) fees	0.24%	1.00%	1.00%	none	none
Other expenses	0.44%	0.58%	0.41%	0.38%	0.41%
Total annual fund operating expenses	1.45%	2.35%	2.18%	1.15%	1.18%
Fee waiver/expense reimbursement	0.11%	0.26%	0.09%	0.06%	0.09%
Total annual fund operating expenses after fee waiver/expense reimbursement	1.34%	2.09%	2.09%	1.09%	1.09%

The Advisor has contractually agreed through September 30, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at 1.34%, 2.09%, 2.09%, 1.09% and 1.09% (excluding extraordinary expenses, taxes, brokerage and interest expenses) for Class A, Class B, Class C, Institutional Class and Class S, respectively. The agreement may only be terminated with the consent of the fund's Board.

EXAMPLE

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 DWS Health Care Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	704	612	312	111	111
3 Years	997	1,009	673	359	366
5 Years	1,312	1,432	1,161	627	640
10 Years	2,202	2,234	2,506	1,392	1,424

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption DWS Health Care Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	704	212	212	111	111
3 Years	997	709	673	359	366
5 Years	1,312	1,232	1,161	627	640
10 Years	2,202	2,234	2,506	1,392	1,424

Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.

PORTFOLIO TURNOVER

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance.

Portfolio turnover rate for fiscal year 2013: 40%.

Principal Investment Strategy

Main investments. The fund concentrates its assets in securities related to the health care sector. Under normal circumstances, the fund will invest at least 80% of total assets in common stock of companies in the health care sector. For purposes of the fund's 80% investment policy, to be considered part of the health care sector, companies must commit at least half of their assets to, or derive at least half of the revenues or net income from, that sector. Industries in the health care sector include pharmaceuticals, biotechnology, medical products and supplies, and health care services. 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.

Main Risks

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. The fund is affected by how the stock market performs. When stock prices fall, you should expect the value of your investment to fall as well.

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.

Because the fund concentrates its investments in companies in the health care sector, it may be vulnerable to setbacks in that industry. In particular, health care companies can be affected by rapid product obsolescence and the unpredictability of winning government approvals.

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.

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.

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.

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. 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 in an orderly fashion at an acceptable price.

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 than 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.

Past Performance

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 were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

CALENDAR YEAR TOTAL RETURNS (%) (Class A)

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.

Best Quarter: 15.04%, Q2 2003 Worst Quarter: -16.51%, Q4 2008
Year-to-Date as of 6/30/2013: 19.44%

Average Annual Total Returns
(For periods ended 12/31/2012 expressed as a %)

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.

Average Annual Total Returns DWS Health Care Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Dec. 29, 2000	10.83%	3.55%	8.24%
Class A After tax on distributions		9.33%	2.68%	7.55%
Class A After tax on distributions and sale of fund shares		9.09%	2.86%	7.16%
Class B before tax	Dec. 29, 2000	13.66%	3.81%	8.01%
Class C before tax	Dec. 29, 2000	16.69%	4.01%	8.05%
INST Class before tax	Dec. 29, 2000	17.98%	5.27%	9.33%
Class S before tax	Mar. 02, 1998	17.90%	5.08%	9.16%
Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	7.10%
S&P North American Health Care Sector Index (reflects no deduction for fees, expenses or taxes)		19.78%	5.83%	8.32%

The Advisor believes the additional index (S&P North American Health Care Sector Index) represents the fund's overall investment process.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS SECURITIES TRUST
Prospectus Date	rr_ProspectusDate	Oct. 01, 2013
Document Creation Date	dei_DocumentCreationDate	Sep. 27, 2013

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS SECURITIES TRUST
Prospectus Date	rr_ProspectusDate	Oct. 01, 2013
DWS Enhanced Commodity Strategy Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Enhanced Commodity Strategy Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund's investment objective is total return.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These are the fees and expenses you may pay when you buy and hold shares. You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in DWS funds. More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 19) 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, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance. Portfolio turnover rate for fiscal year 2013: 71%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	71.00%
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	The Advisor has contractually agreed through September 30, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at 2.25% and 2.25% (excluding extraordinary expenses, taxes, brokerage and interest expenses) for Class B and Class C, 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 DWS funds.
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 for Class B and Class C) 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:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
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 (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 (also referred to as junk bonds). The fund concentrates its investments in commodities-related industries. 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 Dow Jones-UBS 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 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 various 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.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	The fund concentrates its investments in commodities-related industries.
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. Commodities-related investments risk. The commodities-linked derivatives 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. 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. 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. Also, 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. Derivatives risk. Risks associated with derivatives 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. 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 a payment default, security downgrade or 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. High-yield debt securities are considered speculative, and 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 it 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.) 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. 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 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 in an orderly fashion at an acceptable price. 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 than 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. Senior loans 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. Also, because portfolio management relies mainly on its own evaluation of the creditworthiness of borrowers, the fund is particularly dependent on portfolio management's analytical abilities. Senior loans involve other risks, including conflict of interest risk, credit risk, interest rate risk, liquidity risk, and prepayment and extension risk. Conflict of interest risk. Affiliates of the Advisor may participate in the primary and secondary market for senior loans. Because of limitations imposed by applicable law, the presence of the Advisor's affiliates in the senior loan market 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. Tax status risk. Income from certain commodity-linked derivative instruments does not constitute "qualifying income" to the fund for purposes of qualification as a "regulated investment company." Receipt of such income could cause the fund to be subject to tax at the fund level. The IRS has issued a private ruling to the fund that such income earned through its wholly-owned subsidiary constitutes qualifying income. Income from other commodity-linked derivatives in which the fund invests directly 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 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.
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 were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone 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	www.dws-investments.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	Best Quarter: 20.94%, Q2 2008 Worst Quarter: -34.47%, Q3 2008 Year-to-Date as of 6/30/2013: -7.76%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (For periods ended 12/31/2012 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 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 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. Index comparison begins on 2/28/05.
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
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.93%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.23%
Other expenses	rr_OtherExpensesOverAssets	0.30%
Total annual operating expenses	rr_ExpensesOverAssets	1.46%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.46%
1 Year	rr_ExpenseExampleYear01	715
3 Years	rr_ExpenseExampleYear03	1,010
5 Years	rr_ExpenseExampleYear05	1,327
10 Years	rr_ExpenseExampleYear10	2,221
1 Year	rr_ExpenseExampleNoRedemptionYear01	715
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,010
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,327
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,221
2006	rr_AnnualReturn2006	1.41%
2007	rr_AnnualReturn2007	35.03%
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%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-Date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2013
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(7.76%)
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 B
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	4.00%
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.93%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.44%
Total annual operating expenses	rr_ExpensesOverAssets	2.37%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.12%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.25%
1 Year	rr_ExpenseExampleYear01	628
3 Years	rr_ExpenseExampleYear03	1,028
5 Years	rr_ExpenseExampleYear05	1,455
10 Years	rr_ExpenseExampleYear10	2,261
1 Year	rr_ExpenseExampleNoRedemptionYear01	228
3 Years	rr_ExpenseExampleNoRedemptionYear03	728
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,255
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,261
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%
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.93%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.33%
Total annual operating expenses	rr_ExpensesOverAssets	2.26%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.01%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.25%
1 Year	rr_ExpenseExampleYear01	328
3 Years	rr_ExpenseExampleYear03	705
5 Years	rr_ExpenseExampleYear05	1,209
10 Years	rr_ExpenseExampleYear10	2,594
1 Year	rr_ExpenseExampleNoRedemptionYear01	228
3 Years	rr_ExpenseExampleNoRedemptionYear03	705
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,209
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,594
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
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.93%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual operating expenses	rr_ExpensesOverAssets	1.14%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.14%
1 Year	rr_ExpenseExampleYear01	116
3 Years	rr_ExpenseExampleYear03	362
5 Years	rr_ExpenseExampleYear05	628
10 Years	rr_ExpenseExampleYear10	1,386
1 Year	rr_ExpenseExampleNoRedemptionYear01	116
3 Years	rr_ExpenseExampleNoRedemptionYear03	362
5 Years	rr_ExpenseExampleNoRedemptionYear05	628
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,386
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
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	rr_RedemptionFeeOverRedemption	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.93%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.36%
Total annual operating expenses	rr_ExpensesOverAssets	1.29%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.29%
1 Year	rr_ExpenseExampleYear01	131
3 Years	rr_ExpenseExampleYear03	409
5 Years	rr_ExpenseExampleYear05	708
10 Years	rr_ExpenseExampleYear10	1,556
1 Year	rr_ExpenseExampleNoRedemptionYear01	131
3 Years	rr_ExpenseExampleNoRedemptionYear03	409
5 Years	rr_ExpenseExampleNoRedemptionYear05	708
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,556
DWS Enhanced Commodity Strategy Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(7.39%)
5 Year	rr_AverageAnnualReturnYear05	(7.18%)
Since Inception	rr_AverageAnnualReturnSinceInception	1.20%
Class Inception	rr_AverageAnnualReturnInceptionDate	Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(5.25%)
5 Year	rr_AverageAnnualReturnYear05	(6.82%)
Since Inception	rr_AverageAnnualReturnSinceInception	1.21%
Class Inception	rr_AverageAnnualReturnInceptionDate	Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(2.64%)
5 Year	rr_AverageAnnualReturnYear05	(6.76%)
Since Inception	rr_AverageAnnualReturnSinceInception	1.21%
Class Inception	rr_AverageAnnualReturnInceptionDate	Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | before tax | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(1.24%)
5 Year	rr_AverageAnnualReturnYear05	(5.73%)
Since Inception	rr_AverageAnnualReturnSinceInception	2.28%
Class Inception	rr_AverageAnnualReturnInceptionDate	Feb. 14, 2005
DWS Enhanced Commodity Strategy Fund | before tax | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(1.34%)
5 Year	rr_AverageAnnualReturnYear05	(5.87%)
Since Inception	rr_AverageAnnualReturnSinceInception	2.17%
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	(7.89%)
5 Year	rr_AverageAnnualReturnYear05	(11.50%)
Since Inception	rr_AverageAnnualReturnSinceInception	(1.92%)
DWS Enhanced Commodity Strategy Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(4.79%)
5 Year	rr_AverageAnnualReturnYear05	(6.72%)
Since Inception	rr_AverageAnnualReturnSinceInception	0.42%
DWS Enhanced Commodity Strategy Fund | Dow Jones-UBS Commodity Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(1.14%)
5 Year	rr_AverageAnnualReturnYear05	(5.54%)
Since Inception	rr_AverageAnnualReturnSinceInception	(1.52%)

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DWS Enhanced Commodity Strategy Fund

DWS Enhanced Commodity Strategy Fund

Investment Objective

The fund's investment objective is total return.

Fees and Expenses of the Fund

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 DWS funds. More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 19) and Purchase and Redemption of Shares in the fund's Statement of Additional Information (SAI) (p. II-15).

SHAREHOLDER FEES (paid directly from your investment)

Shareholder Fees DWS Enhanced Commodity Strategy Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
Maximum sales charge (load) imposed on purchases, as % of offering price	5.75%	none	none	none	none
Maximum deferred sales charge (load), as % of redemption proceeds	none	4.00%	1.00%	none	none
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	2.00%	2.00%	2.00%	2.00%	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	20	20	20	none	20

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a % of the value of your investment)

Annual Fund Operating Expenses DWS Enhanced Commodity Strategy Fund	Class A	Class B	Class C	INST Class	Class S
Management fee	0.93%	0.93%	0.93%	0.93%	0.93%
Distribution/service (12b-1) fees	0.23%	1.00%	1.00%	none	none
Other expenses	0.30%	0.44%	0.33%	0.21%	0.36%
Total annual fund operating expenses	1.46%	2.37%	2.26%	1.14%	1.29%
Fee waiver/expense reimbursement	none	0.12%	0.01%	none	none
Total annual fund operating expenses after fee waiver/expense reimbursement	1.46%	2.25%	2.25%	1.14%	1.29%

The Advisor has contractually agreed through September 30, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at 2.25% and 2.25% (excluding extraordinary expenses, taxes, brokerage and interest expenses) for Class B and Class C, respectively. The agreement may only be terminated with the consent of the fund's Board.

EXAMPLE

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 for Class B and Class C) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example DWS Enhanced Commodity Strategy Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	715	628	328	116	131
3 Years	1,010	1,028	705	362	409
5 Years	1,327	1,455	1,209	628	708
10 Years	2,221	2,261	2,594	1,386	1,556

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption DWS Enhanced Commodity Strategy Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	715	228	228	116	131
3 Years	1,010	728	705	362	409
5 Years	1,327	1,255	1,209	628	708
10 Years	2,221	2,261	2,594	1,386	1,556

Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.

PORTFOLIO TURNOVER

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance.

Portfolio turnover rate for fiscal year 2013: 71%.

Principal Investment Strategy

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 (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 (also referred to as junk bonds).

The fund concentrates its investments in commodities-related industries. 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 Dow Jones-UBS 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 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 various 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.

Main Risks

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 derivatives 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.

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. 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. Also, 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.

Derivatives risk. Risks associated with derivatives 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.

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 a payment default, security downgrade or 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. High-yield debt securities are considered speculative, and 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 it 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.)

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. 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 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 in an orderly fashion at an acceptable price.

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 than 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. Senior loans 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. Also, because portfolio management relies mainly on its own evaluation of the creditworthiness of borrowers, the fund is particularly dependent on portfolio management's analytical abilities. Senior loans involve other risks, including conflict of interest risk, credit risk, interest rate risk, liquidity risk, and prepayment and extension risk.

Conflict of interest risk. Affiliates of the Advisor may participate in the primary and secondary market for senior loans. Because of limitations imposed by applicable law, the presence of the Advisor's affiliates in the senior loan market 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.

Tax status risk. Income from certain commodity-linked derivative instruments does not constitute "qualifying income" to the fund for purposes of qualification as a "regulated investment company." Receipt of such income could cause the fund to be subject to tax at the fund level. The IRS has issued a private ruling to the fund that such income earned through its wholly-owned subsidiary constitutes qualifying income. Income from other commodity-linked derivatives in which the fund invests directly 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 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.

Past Performance

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 were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

CALENDAR YEAR TOTAL RETURNS (%) (Class A)

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.

Best Quarter: 20.94%, Q2 2008 Worst Quarter: -34.47%, Q3 2008
Year-to-Date as of 6/30/2013: -7.76%

Average Annual Total Returns
(For periods ended 12/31/2012 expressed as a %)

After-tax returns (which are shown only for Class A and would be different for other classes) reflect the 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. Index comparison begins on 2/28/05.

Average Annual Total Returns DWS Enhanced Commodity Strategy Fund	Class Inception	1 Year	5 Year	Since Inception
Class A before tax	Feb. 14, 2005	(7.39%)	(7.18%)	1.20%
Class A After tax on distributions		(7.89%)	(11.50%)	(1.92%)
Class A After tax on distributions and sale of fund shares		(4.79%)	(6.72%)	0.42%
Class B before tax	Feb. 14, 2005	(5.25%)	(6.82%)	1.21%
Class C before tax	Feb. 14, 2005	(2.64%)	(6.76%)	1.21%
INST Class before tax	Feb. 14, 2005	(1.24%)	(5.73%)	2.28%
Class S before tax	Feb. 14, 2005	(1.34%)	(5.87%)	2.17%
Dow Jones-UBS Commodity Index (reflects no deduction for fees, expenses or taxes)		(1.14%)	(5.54%)	(1.52%)

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Document and Entity Information	12 Months Ended
	Oct. 01, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Sep. 27, 2013
Registrant Name	DWS SECURITIES TRUST
Central Index Key	0000088048
Amendment Flag	false
Document Creation Date	Sep. 27, 2013
Document Effective Date	Oct. 01, 2013
Prospectus Date	Oct. 01, 2013