485BPOS

Filed electronically with the Securities and Exchange Commission on March 21, 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. 121	| X |
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	| X |
Amendment No. 105
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 Gold & Precious Metals Fund:  Class A, Class B, Class C, Institutional Class and Class S

·   DWS Technology 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 15th day of March 2013.

DWS SECURITIES TRUST

By:  /s/W. Douglas Beck

W. Douglas Beck*

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/W. Douglas Beck
W. Douglas Beck*	President	March 15, 2013
/s/Paul H. Schubert
Paul H. Schubert	Chief Financial Officer and Treasurer	March 15, 2013
/s/John W. Ballantine
John W. Ballantine*	Trustee	March 15, 2013
/s/Henry P. Becton, Jr.
Henry P. Becton, Jr.*	Trustee	March 15, 2013
/s/Dawn-Marie Driscoll
Dawn-Marie Driscoll*	Trustee	March 15, 2013
/s/Keith R. Fox
Keith R. Fox*	Trustee	March 15, 2013
/s/Paul K. Freeman
Paul K. Freeman*	Trustee	March 15, 2013
/s/Kenneth C. Froewiss
Kenneth C. Froewiss*	Chairperson and Trustee	March 15, 2013
/s/Richard J. Herring
Richard J. Herring*	Trustee	March 15, 2013
/s/William McClayton
William McClayton*	Vice Chairperson and Trustee	March 15, 2013
/s/Rebecca W. Rimel
Rebecca W. Rimel*	Trustee	March 15, 2013
/s/William N. Searcy, Jr.
William N. Searcy, Jr.*	Trustee	March 15, 2013
/s/Jean Gleason Stromberg
Jean Gleason Stromberg*	Trustee	March 15, 2013
/s/Robert H. Wadsworth
Robert H. Wadsworth*	Trustee	March 15, 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. 111 to the Registration Statement as filed on August 2, 2011; 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

DWS Gold & Precious Metals Fund

DWS Gold & Precious Metals Fund

Investment Objective

The fund seeks maximum return (principal change and income).

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. 20) 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 Gold & Precious Metals 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 Gold & Precious Metals Fund	Class A	Class B	Class C	INST Class	Class S
Management fee	0.84%	0.84%	0.84%	0.84%	0.84%
Distribution/service (12b-1) fees	0.24%	1.00%	1.00%	none	none
Other expenses	0.38%	0.40%	0.35%	0.32%	0.37%
Total annual fund operating expenses	1.46%	2.24%	2.19%	1.16%	1.21%
Expense reimbursements	0.18%	0.21%	0.16%	0.13%	0.18%
Net annual operating expenses	1.28%	2.03%	2.03%	1.03%	1.03%

The Advisor has contractually agreed through September 30, 2013 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at 1.18%, 1.93%, 1.93%, 0.93% and 0.93%; and for the period October 1, 2013 through February 28, 2014 at ratios no higher than 1.28%, 2.03%, 2.03%, 1.03% and 1.03% (in each instance, excluding extraordinary expenses, taxes, brokerage, interest expenses, and acquired funds fees and expenses) for Class A, Class B, Class C, Institutional Class and Class S, respectively. These agreements 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 Gold & Precious Metals Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	698	606	306	105	105
3 Years	994	980	670	356	366
5 Years	1,310	1,381	1,160	626	648
10 Years	2,206	2,181	2,511	1,397	1,450

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

Expense Example, No Redemption DWS Gold & Precious Metals Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	698	206	206	105	105
3 Years	994	680	670	356	366
5 Years	1,310	1,181	1,160	626	648
10 Years	2,206	2,181	2,511	1,397	1,450

Class B converts to Class A after six years; the Class B Example 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 2012: 41%.

Principal Investment Strategy

Main investments. The fund invests at least 80% of net assets, plus the amount of any borrowings for investment purposes, in common stocks and other equities of US and foreign companies engaged in activities related to gold, silver, platinum or other precious metals, and in gold coin and bullion directly. The fund's investments in coins and bullion will not earn income, and the sole source of return to the fund from these investments will be from gains or losses realized on the sale of such investments. Companies in which the fund invests may be involved in activities such as exploration, mining, fabrication, processing and distribution. While the fund invests mainly in common stocks, it may invest up to 20% of net assets in high-quality debt securities of companies in precious metals and minerals operations and in debt securities whose return is linked to precious metals prices. The fund may invest in companies of any size and may invest in initial public offerings. The fund may invest in securities of foreign issuers, including issuers located in countries with new or emerging markets.

The fund may invest in other types of equity securities such as preferred stocks or convertible securities.

The fund intends to gain exposure to the commodity markets through direct investments in commodities or investments in commodity-linked derivatives instruments by investing up to 25% of the fund's assets in a wholly owned subsidiary, DWS Cayman Precious Metals Fund, Inc. organized under the laws of the Cayman Islands (the "Subsidiary").

Management process. In choosing securities, portfolio management uses a combination of two analytical disciplines:

Bottom-up research. Portfolio management looks for companies that it believes have strong management and highly marketable securities. It also considers the quality of metals and minerals mined by a company, its fabrication techniques and costs, and its unmined reserves, 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.

The fund may concentrate in securities issued by wholly owned subsidiaries and securities of companies that are primarily engaged in the exploration, mining, fabrication, processing or distribution of gold and other precious metals and in gold, silver, platinum and palladium bullion and coins. At various times, portfolio management may focus on particular countries or regions.

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. To the extent the fund invests in a particular sector, the fund's performance may be proportionately affected by that sector's general performance. When stock prices fall, you should expect the value of your investment to fall as well. Stock prices can be hurt by poor management on the part of the stock's issuer, shrinking product demand and other business risks. These may affect single companies as well as groups of companies. In addition, movements in financial markets may adversely affect a stock's price, regardless of how well the company performs. The market as a whole may not favor the types of investments the fund makes, which could affect the fund's ability to sell them at an attractive price.

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

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.

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

Foreign investment risk. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments could undermine the value of the fund's investments or prevent the fund from realizing their full value. 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.

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.

Non-diversification risk. The fund is classified as non-diversified under the Investment Company Act of 1940, as amended. This means that the fund may invest in securities of relatively few issuers. Thus, the performance of one or a small number of portfolio holdings can affect overall performance.

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

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.

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.

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.

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.

Restricted securities risk. The fund may purchase securities that are subject to legal or contractual restriction on resale ("restricted securities"). The fund may be unable to sell a restricted security and it may be more difficult to determine a market value for a restricted security. This investment practice, therefore, could increase the level of illiquidity of the fund.

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." The IRS has issued a private ruling to the fund that income earned from such commodity-linked investments by the fund's wholly-owned subsidiary constitutes qualifying income to the fund. 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.

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

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.)

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.

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: 44.30%, Q3 2003 Worst Quarter: -35.04%, Q3 2008

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. Institutional Class index comparisons began on 2/29/2008.

Average Annual Total Returns DWS Gold & Precious Metals Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Jun. 25, 2001	(12.96%)	(2.65%)	11.61%
Class A After tax on distributions		(13.08%)	(3.89%)	9.51%
Class A After tax on distributions and sale of fund shares		(8.28%)	(2.25%)	9.87%
Class B before tax	Jun. 25, 2001	(11.21%)	(2.38%)	11.41%
Class C before tax	Jun. 25, 2001	(8.37%)	(2.21%)	11.46%
Class S before tax	Sep. 02, 1988	(7.53%)	(1.26%)	12.53%
Class S Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	7.10%
Class S S&P/Citigroup Gold & Precious Metals Index (reflects no deduction for fees, expenses or taxes)		(10.06%)	(1.14%)	10.24%

Average Annual Total Returns DWS Gold & Precious Metals Fund	Class Inception	1 Year	5 Years	Since Inception
INST Class	Mar. 03, 2008	(7.43%)		(5.33%)
INST Class Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes)		16.00%		3.74%
INST Class S&P/Citigroup Gold & Precious Metals Index (reflects no deduction for fees, expenses or taxes)		(10.06%)		(4.29%)

The Advisor believes the additional S&P/Citigroup Gold & Precious Metals Index generally reflects fund asset allocations and generally represents the fund's overall investment process.

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Document and Entity Information	12 Months Ended
	Mar. 01, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Oct. 31, 2012
Registrant Name	DWS SECURITIES TRUST
Central Index Key	0000088048
Amendment Flag	false
Document Creation Date	Feb. 28, 2013
Document Effective Date	Mar. 01, 2013
Prospectus Date	Mar. 01, 2013

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DWS Technology Fund

DWS Technology Fund

Investment Objective

The fund seeks 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. 20) 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 Technology 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 Technology Fund	Class A	Class B	Class C	INST Class	Class S
Management fee	0.46%	0.46%	0.46%	0.46%	0.46%
Distribution/service (12b-1) fees	0.22%	0.99%	1.00%	none	none
Other expenses	0.33%	0.66%	0.44%	0.21%	0.46%
Total annual fund operating expenses	1.01%	2.11%	1.90%	0.67%	0.92%

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 remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example DWS Technology Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	672	614	293	68	94
3 Years	878	961	597	214	293
5 Years	1,101	1,334	1,026	373	509
10 Years	1,740	1,900	2,222	835	1,131

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

Expense Example, No Redemption DWS Technology Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	672	214	193	68	94
3 Years	878	661	597	214	293
5 Years	1,101	1,134	1,026	373	509
10 Years	1,740	1,900	2,222	835	1,131

Class B converts to Class A after six years; the Class B Example 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 2012: 22%.

Principal Investment Strategy

Main investments. Under normal circumstances, the fund invests at least 80% of net assets, plus the amount of any borrowings for investment purposes, in common stocks of companies in the technology sector. For purposes of the fund's 80% investment policy, the fund defines a company as being in the technology sector if it commits at least half its assets to, or derives at least half its revenues or net income from, that sector. Examples of industries within the technology sector are semiconductors, software, telecom equipment, computer/hardware, IT services, the Internet and health technology. The fund may invest in companies of any size and may invest in initial public offerings. While the fund invests mainly in US stocks, it could invest up to 35% of net assets in foreign securities (including emerging markets securities).

The fund will concentrate its assets in the group of industries constituting the technology sector and may concentrate in one or more industries in the technology sector.

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

Bottom-up research. Portfolio management looks for individual companies that it believes have a history of above-average growth, strong competitive positioning, attractive prices relative to potential growth, innovative products and services, 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 outlooks for various industries within the technology sector and looks for those that may benefit from changes in the overall business environment.

Portfolio management may favor securities from various industries and companies within the technology sector at different times.

Derivatives. Portfolio management generally may use option contracts, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities) (i) for hedging purposes; (ii) as a substitute for direct investment; (iii) for locking in the purchase price of a security or currency which portfolio management expects to purchase in the near future; and (iv) for non-hedging purposes to seek to enhance potential gain.

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

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. To the extent the fund invests in a particular sector, the fund's performance may be proportionately affected by that sector's general performance. When stock prices fall, you should expect the value of your investment to fall as well. Stock prices can be hurt by poor management on the part of the stock's issuer, shrinking product demand and other business risks. These may affect single companies as well as groups of companies. In addition, movements in financial markets may adversely affect a stock's price, regardless of how well the company performs. The market as a whole may not favor the types of investments the fund makes, which could affect the fund's ability to sell them at an attractive price.

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

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.

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

Foreign investment risk. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments could undermine the value of the fund's investments or prevent the fund from realizing their full value. 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.

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.

Non-diversification risk. The fund is classified as non-diversified under the Investment Company Act of 1940, as amended. This means that the fund may invest in securities of relatively few issuers. Thus, the performance of one or a small number of portfolio holdings can affect overall performance.

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

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.

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.

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.

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.

Restricted securities risk. The fund may purchase securities that are subject to legal or contractual restriction on resale ("restricted securities"). The fund may be unable to sell a restricted security and it may be more difficult to determine a market value for a restricted security. This investment practice, therefore, could increase the level of illiquidity of the fund.

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

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.)

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.

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: 22.54%, Q1 2012 Worst Quarter: -25.28%, Q4 2008

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. Class S index comparisons began on 12/31/2004.

Average Annual Total Returns DWS Technology Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Sep. 07, 1948	7.54%	0.84%	6.40%
Class A After tax on distributions		7.54%	0.84%	6.40%
Class A After tax on distributions and sale of fund shares		4.90%	0.72%	5.64%
Class B before tax	May 31, 1994	9.92%	0.73%	5.84%
Class C before tax	May 31, 1994	13.08%	1.14%	6.03%
INST Class before tax	Aug. 19, 2002	14.49%	2.45%	7.59%
INST Class Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	7.10%
INST Class S&P North American Technology Sector Index (reflects no deduction for fees, expenses or taxes)		15.23%	3.54%	9.40%

Average Annual Total Returns DWS Technology Fund	Class Inception	1 Year	5 Years	Since Inception
Class S	Dec. 20, 2004	14.22%	2.11%	3.65%
Class S Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	4.22%
Class S S&P North American Technology Sector Index (reflects no deduction for fees, expenses or taxes)		15.23%	3.54%	5.61%

The Advisor believes the additional S&P North American Technology Sector Index generally reflects fund asset allocations and generally 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	Mar. 01, 2013
DWS Technology Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Technology Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks 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. 20) 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)
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 2012: 22%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	22.00%
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 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 Class B Example 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 at least 80% of net assets, plus the amount of any borrowings for investment purposes, in common stocks of companies in the technology sector. For purposes of the fund's 80% investment policy, the fund defines a company as being in the technology sector if it commits at least half its assets to, or derives at least half its revenues or net income from, that sector. Examples of industries within the technology sector are semiconductors, software, telecom equipment, computer/hardware, IT services, the Internet and health technology. The fund may invest in companies of any size and may invest in initial public offerings. While the fund invests mainly in US stocks, it could invest up to 35% of net assets in foreign securities (including emerging markets securities). The fund will concentrate its assets in the group of industries constituting the technology sector and may concentrate in one or more industries in the technology sector. Management process. In choosing securities, portfolio management uses a combination of three analytical disciplines: Bottom-up research. Portfolio management looks for individual companies that it believes have a history of above-average growth, strong competitive positioning, attractive prices relative to potential growth, innovative products and services, 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 outlooks for various industries within the technology sector and looks for those that may benefit from changes in the overall business environment. Portfolio management may favor securities from various industries and companies within the technology sector at different times. Derivatives. Portfolio management generally may use option contracts, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities) (i) for hedging purposes; (ii) as a substitute for direct investment; (iii) for locking in the purchase price of a security or currency which portfolio management expects to purchase in the near future; and (iv) for non-hedging purposes to seek to enhance potential gain. The fund may also use various types of derivatives (i) for hedging purposes; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions. 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 will concentrate its assets in the group of industries constituting the technology sector and may concentrate in one or more industries in the technology 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. To the extent the fund invests in a particular sector, the fund's performance may be proportionately affected by that sector's general performance. When stock prices fall, you should expect the value of your investment to fall as well. Stock prices can be hurt by poor management on the part of the stock's issuer, shrinking product demand and other business risks. These may affect single companies as well as groups of companies. In addition, movements in financial markets may adversely affect a stock's price, regardless of how well the company performs. The market as a whole may not favor the types of investments the fund makes, which could affect the fund's ability to sell them at an attractive price. Concentration risk. Any fund that concentrates in a particular segment of the market will generally be more volatile than a fund that invests more broadly. Any market price movements, regulatory or technological changes, or economic conditions affecting the particular segment of the market in which the fund concentrates may have a significant impact on the fund's performance. 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. Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Because stock analysts are less likely to follow medium-sized companies, less information about them is available to investors. Industry-wide reversals may have a greater impact on medium-sized companies, since they lack the financial resources of larger companies. Medium-sized company stocks are typically less liquid than large company stocks. Foreign investment risk. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments could undermine the value of the fund's investments or prevent the fund from realizing their full value. 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. 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. Non-diversification risk. The fund is classified as non-diversified under the Investment Company Act of 1940, as amended. This means that the fund may invest in securities of relatively few issuers. Thus, the performance of one or a small number of portfolio holdings can affect overall performance. Security selection risk. The securities in the fund's portfolio may decline in value. Portfolio management could be wrong in its analysis of industries, companies, economic trends, the relative attractiveness of different securities or other matters. 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. 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. 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. 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. Restricted securities risk. The fund may purchase securities that are subject to legal or contractual restriction on resale ("restricted securities"). The fund may be unable to sell a restricted security and it may be more difficult to determine a market value for a restricted security. This investment practice, therefore, could increase the level of illiquidity of the fund. Credit risk. The fund's performance could be hurt if an issuer of a security suffers an adverse change in financial condition that results in the issuer not making timely payments of interest or principal, a security downgrade or inability to meet a financial obligation. 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.) 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.
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 Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-diversification risk. The fund is classified as non-diversified under the Investment Company Act of 1940, as amended. This means that the fund may invest in securities of relatively few issuers. Thus, the performance of one or a small number of portfolio holdings can affect overall performance.
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 S&P North American Technology Sector Index generally reflects fund asset allocations and generally 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: 22.54%, Q1 2012 Worst Quarter: -25.28%, Q4 2008
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. Class S index comparisons began on 12/31/2004.
DWS Technology 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	0.46%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.22%
Other expenses	rr_OtherExpensesOverAssets	0.33%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.01%
1 Year	rr_ExpenseExampleYear01	672
3 Years	rr_ExpenseExampleYear03	878
5 Years	rr_ExpenseExampleYear05	1,101
10 Years	rr_ExpenseExampleYear10	1,740
1 Year	rr_ExpenseExampleNoRedemptionYear01	672
3 Years	rr_ExpenseExampleNoRedemptionYear03	878
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,101
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,740
2003	rr_AnnualReturn2003	48.19%
2004	rr_AnnualReturn2004	1.63%
2005	rr_AnnualReturn2005	3.64%
2006	rr_AnnualReturn2006	0.26%
2007	rr_AnnualReturn2007	13.94%
2008	rr_AnnualReturn2008	(45.87%)
2009	rr_AnnualReturn2009	58.25%
2010	rr_AnnualReturn2010	18.28%
2011	rr_AnnualReturn2011	(4.30%)
2012	rr_AnnualReturn2012	14.10%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2012
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	22.54%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(25.28%)
DWS Technology 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	0.46%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.99%
Other expenses	rr_OtherExpensesOverAssets	0.66%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.11%
1 Year	rr_ExpenseExampleYear01	614
3 Years	rr_ExpenseExampleYear03	961
5 Years	rr_ExpenseExampleYear05	1,334
10 Years	rr_ExpenseExampleYear10	1,900
1 Year	rr_ExpenseExampleNoRedemptionYear01	214
3 Years	rr_ExpenseExampleNoRedemptionYear03	661
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,134
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,900
DWS Technology 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	0.46%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.44%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.90%
1 Year	rr_ExpenseExampleYear01	293
3 Years	rr_ExpenseExampleYear03	597
5 Years	rr_ExpenseExampleYear05	1,026
10 Years	rr_ExpenseExampleYear10	2,222
1 Year	rr_ExpenseExampleNoRedemptionYear01	193
3 Years	rr_ExpenseExampleNoRedemptionYear03	597
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,026
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,222
DWS Technology 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	0.46%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.67%
1 Year	rr_ExpenseExampleYear01	68
3 Years	rr_ExpenseExampleYear03	214
5 Years	rr_ExpenseExampleYear05	373
10 Years	rr_ExpenseExampleYear10	835
1 Year	rr_ExpenseExampleNoRedemptionYear01	68
3 Years	rr_ExpenseExampleNoRedemptionYear03	214
5 Years	rr_ExpenseExampleNoRedemptionYear05	373
10 Years	rr_ExpenseExampleNoRedemptionYear10	835
DWS Technology 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	0.46%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.46%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.92%
1 Year	rr_ExpenseExampleYear01	94
3 Years	rr_ExpenseExampleYear03	293
5 Years	rr_ExpenseExampleYear05	509
10 Years	rr_ExpenseExampleYear10	1,131
1 Year	rr_ExpenseExampleNoRedemptionYear01	94
3 Years	rr_ExpenseExampleNoRedemptionYear03	293
5 Years	rr_ExpenseExampleNoRedemptionYear05	509
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,131
1 Year	rr_AverageAnnualReturnYear01	14.22%
5 Years	rr_AverageAnnualReturnYear05	2.11%
Since Inception	rr_AverageAnnualReturnSinceInception	3.65%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 20, 2004
DWS Technology Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.54%
5 Years	rr_AverageAnnualReturnYear05	0.84%
10 Years	rr_AverageAnnualReturnYear10	6.40%
Class Inception	rr_AverageAnnualReturnInceptionDate	Sep. 07, 1948
DWS Technology Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.92%
5 Years	rr_AverageAnnualReturnYear05	0.73%
10 Years	rr_AverageAnnualReturnYear10	5.84%
Class Inception	rr_AverageAnnualReturnInceptionDate	May 31, 1994
DWS Technology Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	13.08%
5 Years	rr_AverageAnnualReturnYear05	1.14%
10 Years	rr_AverageAnnualReturnYear10	6.03%
Class Inception	rr_AverageAnnualReturnInceptionDate	May 31, 1994
DWS Technology Fund | before tax | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.49%
5 Years	rr_AverageAnnualReturnYear05	2.45%
10 Years	rr_AverageAnnualReturnYear10	7.59%
Class Inception	rr_AverageAnnualReturnInceptionDate	Aug. 19, 2002
DWS Technology Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.54%
5 Years	rr_AverageAnnualReturnYear05	0.84%
10 Years	rr_AverageAnnualReturnYear10	6.40%
DWS Technology Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	4.90%
5 Years	rr_AverageAnnualReturnYear05	0.72%
10 Years	rr_AverageAnnualReturnYear10	5.64%
DWS Technology Fund | Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes) | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.00%
5 Years	rr_AverageAnnualReturnYear05	1.66%
10 Years	rr_AverageAnnualReturnYear10	7.10%
DWS Technology Fund | Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes) | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.00%
5 Years	rr_AverageAnnualReturnYear05	1.66%
Since Inception	rr_AverageAnnualReturnSinceInception	4.22%
DWS Technology Fund | S&P North American Technology Sector Index (reflects no deduction for fees, expenses or taxes) | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.23%
5 Years	rr_AverageAnnualReturnYear05	3.54%
10 Years	rr_AverageAnnualReturnYear10	9.40%
DWS Technology Fund | S&P North American Technology Sector Index (reflects no deduction for fees, expenses or taxes) | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.23%
5 Years	rr_AverageAnnualReturnYear05	3.54%
Since Inception	rr_AverageAnnualReturnSinceInception	5.61%

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS SECURITIES TRUST
Prospectus Date	rr_ProspectusDate	Mar. 01, 2013
DWS Gold & Precious Metals Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Gold & Precious Metals Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks maximum return (principal change and income).
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. 20) 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	February 28, 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 2012: 41%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	41.00%
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	The Advisor has contractually agreed through September 30, 2013 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at 1.18%, 1.93%, 1.93%, 0.93% and 0.93%; and for the period October 1, 2013 through February 28, 2014 at ratios no higher than 1.28%, 2.03%, 2.03%, 1.03% and 1.03% (in each instance, excluding extraordinary expenses, taxes, brokerage, interest expenses, and acquired funds fees and expenses) for Class A, Class B, Class C, Institutional Class and Class S, respectively. These agreements 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 Class B Example reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. The fund invests at least 80% of net assets, plus the amount of any borrowings for investment purposes, in common stocks and other equities of US and foreign companies engaged in activities related to gold, silver, platinum or other precious metals, and in gold coin and bullion directly. The fund's investments in coins and bullion will not earn income, and the sole source of return to the fund from these investments will be from gains or losses realized on the sale of such investments. Companies in which the fund invests may be involved in activities such as exploration, mining, fabrication, processing and distribution. While the fund invests mainly in common stocks, it may invest up to 20% of net assets in high-quality debt securities of companies in precious metals and minerals operations and in debt securities whose return is linked to precious metals prices. The fund may invest in companies of any size and may invest in initial public offerings. The fund may invest in securities of foreign issuers, including issuers located in countries with new or emerging markets. The fund may invest in other types of equity securities such as preferred stocks or convertible securities. The fund intends to gain exposure to the commodity markets through direct investments in commodities or investments in commodity-linked derivatives instruments by investing up to 25% of the fund's assets in a wholly owned subsidiary, DWS Cayman Precious Metals Fund, Inc. organized under the laws of the Cayman Islands (the "Subsidiary"). Management process. In choosing securities, portfolio management uses a combination of two analytical disciplines: Bottom-up research. Portfolio management looks for companies that it believes have strong management and highly marketable securities. It also considers the quality of metals and minerals mined by a company, its fabrication techniques and costs, and its unmined reserves, 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. The fund may concentrate in securities issued by wholly owned subsidiaries and securities of companies that are primarily engaged in the exploration, mining, fabrication, processing or distribution of gold and other precious metals and in gold, silver, platinum and palladium bullion and coins. At various times, portfolio management may focus on particular countries or regions. 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 intends to gain exposure to the commodity markets through direct investments in commodities or investments in commodity-linked derivatives instruments by investing up to 25% of the fund's assets in a wholly owned subsidiary, DWS Cayman Precious Metals Fund, Inc. organized under the laws of the Cayman Islands (the "Subsidiary").
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. To the extent the fund invests in a particular sector, the fund's performance may be proportionately affected by that sector's general performance. When stock prices fall, you should expect the value of your investment to fall as well. Stock prices can be hurt by poor management on the part of the stock's issuer, shrinking product demand and other business risks. These may affect single companies as well as groups of companies. In addition, movements in financial markets may adversely affect a stock's price, regardless of how well the company performs. The market as a whole may not favor the types of investments the fund makes, which could affect the fund's ability to sell them at an attractive price. Concentration risk. Any fund that concentrates in a particular segment of the market will generally be more volatile than a fund that invests more broadly. Any market price movements, regulatory or technological changes, or economic conditions affecting the particular segment of the market in which the fund concentrates may have a significant impact on the fund's performance. 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. Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Because stock analysts are less likely to follow medium-sized companies, less information about them is available to investors. Industry-wide reversals may have a greater impact on medium-sized companies, since they lack the financial resources of larger companies. Medium-sized company stocks are typically less liquid than large company stocks. Foreign investment risk. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments could undermine the value of the fund's investments or prevent the fund from realizing their full value. 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. 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. Non-diversification risk. The fund is classified as non-diversified under the Investment Company Act of 1940, as amended. This means that the fund may invest in securities of relatively few issuers. Thus, the performance of one or a small number of portfolio holdings can affect overall performance. Security selection risk. The securities in the fund's portfolio may decline in value. Portfolio management could be wrong in its analysis of industries, companies, economic trends, the relative attractiveness of different securities or other matters. 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. 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. 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. 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. Restricted securities risk. The fund may purchase securities that are subject to legal or contractual restriction on resale ("restricted securities"). The fund may be unable to sell a restricted security and it may be more difficult to determine a market value for a restricted security. This investment practice, therefore, could increase the level of illiquidity of the fund. 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." The IRS has issued a private ruling to the fund that income earned from such commodity-linked investments by the fund's wholly-owned subsidiary constitutes qualifying income to the fund. 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. Credit risk. The fund's performance could be hurt if an issuer of a security suffers an adverse change in financial condition that results in the issuer not making timely payments of interest or principal, a security downgrade or inability to meet a financial obligation. 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.) 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. 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 Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-diversification risk. The fund is classified as non-diversified under the Investment Company Act of 1940, as amended. This means that the fund may invest in securities of relatively few issuers. Thus, the performance of one or a small number of portfolio holdings can affect overall performance.
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 S&P/Citigroup Gold & Precious Metals Index generally reflects fund asset allocations and generally 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: 44.30%, Q3 2003 Worst Quarter: -35.04%, Q3 2008
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. Institutional Class index comparisons began on 2/29/2008.
DWS Gold & Precious Metals 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	0.84%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.24%
Other expenses	rr_OtherExpensesOverAssets	0.38%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.46%
Expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.18%
Net annual operating expenses	rr_NetExpensesOverAssets	1.28%
1 Year	rr_ExpenseExampleYear01	698
3 Years	rr_ExpenseExampleYear03	994
5 Years	rr_ExpenseExampleYear05	1,310
10 Years	rr_ExpenseExampleYear10	2,206
1 Year	rr_ExpenseExampleNoRedemptionYear01	698
3 Years	rr_ExpenseExampleNoRedemptionYear03	994
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,310
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,206
2003	rr_AnnualReturn2003	94.20%
2004	rr_AnnualReturn2004	(9.14%)
2005	rr_AnnualReturn2005	20.53%
2006	rr_AnnualReturn2006	28.92%
2007	rr_AnnualReturn2007	25.12%
2008	rr_AnnualReturn2008	(32.86%)
2009	rr_AnnualReturn2009	41.22%
2010	rr_AnnualReturn2010	37.22%
2011	rr_AnnualReturn2011	(22.81%)
2012	rr_AnnualReturn2012	(7.65%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	44.30%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(35.04%)
DWS Gold & Precious Metals 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	0.84%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.40%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.24%
Expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.21%
Net annual operating expenses	rr_NetExpensesOverAssets	2.03%
1 Year	rr_ExpenseExampleYear01	606
3 Years	rr_ExpenseExampleYear03	980
5 Years	rr_ExpenseExampleYear05	1,381
10 Years	rr_ExpenseExampleYear10	2,181
1 Year	rr_ExpenseExampleNoRedemptionYear01	206
3 Years	rr_ExpenseExampleNoRedemptionYear03	680
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,181
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,181
DWS Gold & Precious Metals 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	0.84%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.35%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.19%
Expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.16%
Net annual operating expenses	rr_NetExpensesOverAssets	2.03%
1 Year	rr_ExpenseExampleYear01	306
3 Years	rr_ExpenseExampleYear03	670
5 Years	rr_ExpenseExampleYear05	1,160
10 Years	rr_ExpenseExampleYear10	2,511
1 Year	rr_ExpenseExampleNoRedemptionYear01	206
3 Years	rr_ExpenseExampleNoRedemptionYear03	670
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,160
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,511
DWS Gold & Precious Metals 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	0.84%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.32%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.16%
Expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.13%
Net annual operating expenses	rr_NetExpensesOverAssets	1.03%
1 Year	rr_ExpenseExampleYear01	105
3 Years	rr_ExpenseExampleYear03	356
5 Years	rr_ExpenseExampleYear05	626
10 Years	rr_ExpenseExampleYear10	1,397
1 Year	rr_ExpenseExampleNoRedemptionYear01	105
3 Years	rr_ExpenseExampleNoRedemptionYear03	356
5 Years	rr_ExpenseExampleNoRedemptionYear05	626
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,397
1 Year	rr_AverageAnnualReturnYear01	(7.43%)
5 Years	rr_AverageAnnualReturnYear05
Since Inception	rr_AverageAnnualReturnSinceInception	(5.33%)
Class Inception	rr_AverageAnnualReturnInceptionDate	Mar. 03, 2008
DWS Gold & Precious Metals 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	0.84%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.37%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.21%
Expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.18%
Net annual operating expenses	rr_NetExpensesOverAssets	1.03%
1 Year	rr_ExpenseExampleYear01	105
3 Years	rr_ExpenseExampleYear03	366
5 Years	rr_ExpenseExampleYear05	648
10 Years	rr_ExpenseExampleYear10	1,450
1 Year	rr_ExpenseExampleNoRedemptionYear01	105
3 Years	rr_ExpenseExampleNoRedemptionYear03	366
5 Years	rr_ExpenseExampleNoRedemptionYear05	648
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,450
DWS Gold & Precious Metals Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(12.96%)
5 Years	rr_AverageAnnualReturnYear05	(2.65%)
10 Years	rr_AverageAnnualReturnYear10	11.61%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Gold & Precious Metals Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(11.21%)
5 Years	rr_AverageAnnualReturnYear05	(2.38%)
10 Years	rr_AverageAnnualReturnYear10	11.41%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Gold & Precious Metals Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(8.37%)
5 Years	rr_AverageAnnualReturnYear05	(2.21%)
10 Years	rr_AverageAnnualReturnYear10	11.46%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Gold & Precious Metals Fund | before tax | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(7.53%)
5 Years	rr_AverageAnnualReturnYear05	(1.26%)
10 Years	rr_AverageAnnualReturnYear10	12.53%
Class Inception	rr_AverageAnnualReturnInceptionDate	Sep. 02, 1988
DWS Gold & Precious Metals Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(13.08%)
5 Years	rr_AverageAnnualReturnYear05	(3.89%)
10 Years	rr_AverageAnnualReturnYear10	9.51%
DWS Gold & Precious Metals Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(8.28%)
5 Years	rr_AverageAnnualReturnYear05	(2.25%)
10 Years	rr_AverageAnnualReturnYear10	9.87%
DWS Gold & Precious Metals Fund | Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes) | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.00%
5 Years	rr_AverageAnnualReturnYear05
Since Inception	rr_AverageAnnualReturnSinceInception	3.74%
DWS Gold & Precious Metals Fund | Standard & Poor's 500 Index (S&P 500) (reflects no deduction for fees, expenses or taxes) | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.00%
5 Years	rr_AverageAnnualReturnYear05	1.66%
10 Years	rr_AverageAnnualReturnYear10	7.10%
DWS Gold & Precious Metals Fund | S&P/Citigroup Gold & Precious Metals Index (reflects no deduction for fees, expenses or taxes) | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(10.06%)
5 Years	rr_AverageAnnualReturnYear05
Since Inception	rr_AverageAnnualReturnSinceInception	(4.29%)
DWS Gold & Precious Metals Fund | S&P/Citigroup Gold & Precious Metals Index (reflects no deduction for fees, expenses or taxes) | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(10.06%)
5 Years	rr_AverageAnnualReturnYear05	(1.14%)
10 Years	rr_AverageAnnualReturnYear10	10.24%

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS SECURITIES TRUST
Prospectus Date	rr_ProspectusDate	Mar. 01, 2013
Document Creation Date	dei_DocumentCreationDate	Feb. 28, 2013