485BPOS

Filed electronically with the Securities and Exchange Commission on February 22, 2013

File No. 002-13628

File No. 811-00043

UNITED STATES 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. 195	| X |
and/or
REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940	| X |
Amendment No. 145
DWS Investment 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)
Copy to: Thomas Hiller, Esq. Ropes & Gray Prudential Tower, 800 Boylston Street Boston, MA 02199-3600

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)(3) 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 Capital Growth Fund — Class A, Class B, Class C, Class R , Institutional Class and Class S

·   DWS Core Equity Fund — Class A, Class B, Class C, Class R,  Institutional Class and Class S

·   DWS Mid Cap Growth Fund — Class A, Class B, Class C, Institutional Class and Class S

·   DWS Small Cap Core Fund — Class A, Class B, Class C and Class S

·   DWS Small Cap Growth Fund — Class A, Class B, Class C, Class R, 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 February 2013.

DWS INVESTMENT 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		February 15, 2013
/s/Paul H. Schubert
Paul H. Schubert		Chief Financial Officer and Treasurer		February 15, 2013
/s/John W. Ballantine
John W. Ballantine*		Trustee		February 15, 2013
/s/Henry P. Becton, Jr.
Henry P. Becton, Jr.*		Trustee		February 15, 2013
/s/Dawn-Marie Driscoll
Dawn-Marie Driscoll*		Trustee		February 15, 2013
/s/Keith R. Fox
Keith R. Fox*		Trustee		February 15, 2013
/s/Paul K. Freeman
Paul K. Freeman*		Trustee		February 15, 2013
/s/Kenneth C. Froewiss
Kenneth C. Froewiss*		Chairperson and Trustee		February 15, 2013
/s/Richard J. Herring
Richard J. Herring*		Trustee		February 15, 2013
/s/William McClayton
William McClayton*		Vice Chairperson and Trustee		February 15, 2013
/s/Rebecca W. Rimel
Rebecca W. Rimel*		Trustee		February 15, 2013
/s/William N. Searcy, Jr.
William N. Searcy, Jr.*		Trustee		February 15, 2013
/s/Jean Gleason Stromberg
Jean Gleason Stromberg*		Trustee		February 15, 2013
/s/Robert H. Wadsworth
Robert H. Wadsworth*		Trustee		February 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. 184 to the Registration Statement filed on November 28, 2011; and as filed on April 29, 2008 in Post-Effective Amendment No. 168 to the Registration Statement.

EXHIBIT INDEX

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

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS Investment Trust
Prospectus Date	rr_ProspectusDate	Feb. 01, 2013
DWS Small Cap Core Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Small Cap Core Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks to provide long-term capital growth.
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. 34) 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	January 31, 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: 379%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	379.00%
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 1.40%, 2.15%, 2.15% and 1.15%; and for the period from October 1, 2013 through January 31, 2014, at ratios no higher than 1.44%, 2.19%, 2.19% and 1.19% (in each instance, excluding extraordinary expenses, taxes, brokerage and interest expenses) for Classes A, B, C and 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 Example for Class B reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. Under normal circumstances, the fund invests at least 80% of net assets, plus the amount of any borrowings for investment purposes, in common stocks of small US companies with potential for above-average long-term capital growth. These companies are similar in size to the companies in the Russell 2000® Index (generally the 2,000 smallest companies out of the 3,000 largest companies in the US). As of December 31, 2012, the median market capitalization of the index was $508 million. The fund intends to invest in companies whose market capitalizations fall within the normal range of theRussell 2000® Index. While the fund invests primarily in common stocks, it may invest up to 20% of its total assets in US government securities. The fund may also invest in other types of equity securities such as preferred stocks or convertible securities. Management process. Portfolio management uses a quantitative stock valuation model to compare each company's stock price to the company's earnings, book value, sales and other measures of performance potential. Portfolio management also incorporates technical analysis to capture short-term price changes and evaluate the market's responsiveness to new information. Portfolio management then seeks to build a diversified portfolio of companies that are attractively rated based on its investment process. Derivatives. Portfolio management generally may use futures contracts, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions. 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.
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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance. Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Small companies are less widely followed by stock analysts and 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. 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. 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. 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. 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. Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price. Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.
Risk Lose Money [Text]	rr_RiskLoseMoney	There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Past Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).
Performance 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: 21.83%, Q2 2003  Worst Quarter: -27.55%, 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.
DWS Small Cap Core 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	0.67%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.70%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.62%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.18%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.44%
1 Year	rr_ExpenseExampleYear01	713
3 Years	rr_ExpenseExampleYear03	1,040
5 Years	rr_ExpenseExampleYear05	1,390
10 Years	rr_ExpenseExampleYear10	2,372
1 Year	rr_ExpenseExampleNoRedemptionYear01	713
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,040
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,390
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,372
2003	rr_AnnualReturn2003	48.56%
2004	rr_AnnualReturn2004	16.37%
2005	rr_AnnualReturn2005	2.53%
2006	rr_AnnualReturn2006	15.21%
2007	rr_AnnualReturn2007	(11.66%)
2008	rr_AnnualReturn2008	(38.48%)
2009	rr_AnnualReturn2009	28.87%
2010	rr_AnnualReturn2010	20.67%
2011	rr_AnnualReturn2011	(2.59%)
2012	rr_AnnualReturn2012	17.59%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	21.83%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(27.55%)
DWS Small Cap Core 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	0.67%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.72%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.39%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.20%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.19%
1 Year	rr_ExpenseExampleYear01	622
3 Years	rr_ExpenseExampleYear03	1,026
5 Years	rr_ExpenseExampleYear05	1,457
10 Years	rr_ExpenseExampleYear10	2,344
1 Year	rr_ExpenseExampleNoRedemptionYear01	222
3 Years	rr_ExpenseExampleNoRedemptionYear03	726
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,257
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,344
DWS Small Cap Core 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	0.67%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.72%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.39%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.20%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.19%
1 Year	rr_ExpenseExampleYear01	322
3 Years	rr_ExpenseExampleYear03	726
5 Years	rr_ExpenseExampleYear05	1,257
10 Years	rr_ExpenseExampleYear10	2,711
1 Year	rr_ExpenseExampleNoRedemptionYear01	222
3 Years	rr_ExpenseExampleNoRedemptionYear03	726
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,257
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,711
DWS Small Cap Core 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	0.67%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.64%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.31%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.12%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.19%
1 Year	rr_ExpenseExampleYear01	121
3 Years	rr_ExpenseExampleYear03	403
5 Years	rr_ExpenseExampleYear05	707
10 Years	rr_ExpenseExampleYear10	1,569
1 Year	rr_ExpenseExampleNoRedemptionYear01	121
3 Years	rr_ExpenseExampleNoRedemptionYear03	403
5 Years	rr_ExpenseExampleNoRedemptionYear05	707
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,569
DWS Small Cap Core Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	10.83%
5 Years	rr_AverageAnnualReturnYear05	0.65%
10 Years	rr_AverageAnnualReturnYear10	6.42%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Small Cap Core Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	13.70%
5 Years	rr_AverageAnnualReturnYear05	0.92%
10 Years	rr_AverageAnnualReturnYear10	6.23%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Small Cap Core Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.74%
5 Years	rr_AverageAnnualReturnYear05	1.07%
10 Years	rr_AverageAnnualReturnYear10	6.24%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Small Cap Core Fund | before tax | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	17.85%
5 Years	rr_AverageAnnualReturnYear05	2.08%
10 Years	rr_AverageAnnualReturnYear10	7.35%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jul. 14, 2000
DWS Small Cap Core Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	10.74%
5 Years	rr_AverageAnnualReturnYear05	0.62%
10 Years	rr_AverageAnnualReturnYear10	5.03%
DWS Small Cap Core Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.14%
5 Years	rr_AverageAnnualReturnYear05	0.55%
10 Years	rr_AverageAnnualReturnYear10	5.11%
DWS Small Cap Core Fund | Russell 2000 Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.35%
5 Years	rr_AverageAnnualReturnYear05	3.56%
10 Years	rr_AverageAnnualReturnYear10	9.72%

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS Investment Trust
Prospectus Date	rr_ProspectusDate	Feb. 01, 2013
DWS Mid Cap Growth Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Mid Cap Growth Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks long-term capital growth.
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. 34) 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	January 31, 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: 70%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	70.00%
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 2.10%; and for the period from October 1, 2013 through January 31, 2014, at a ratio no higher than 2.13% (in each instance, excluding extraordinary expenses, taxes, brokerage and interest expenses) for Class B. 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 for Class B) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block]	rr_ExpenseExampleNoRedemptionNarrativeTextBlock	You would pay the following expenses if you did not redeem your shares:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. Under normal circumstances, the fund invests at least 80% of its assets, determined at the time of purchase, in companies with market caps within the market capitalization range of the Russell Mid Cap Growth Index or securities with equity characteristics that provide exposure to those companies. While the market capitalization range of the Russell Mid Cap Growth Index changes throughout the year, as of the most recent reconstitution date of the index (June 22, 2012), companies in the index had a weighted average market capitalization of approximately $8.57 billion. The fund's equity investments are mainly common stocks, but may also include other types of equity securities such as preferred stocks or convertible securities. The fund may invest up to 20% of its assets in stocks and other securities of companies based outside the US. Management process. In choosing stocks, portfolio management focuses on individual security selection rather than industry selection. Portfolio management uses an active process that combines financial analysis with company visits to evaluate management and strategies. Each portfolio manager has specific sector responsibilities, with investment discretion over securities within their sectors. Company research lies at the heart of the investment process. Portfolio management uses a "bottom-up" approach to picking securities, focusing on stocks portfolio management believes to be undervalued, but with fast-growing earnings and superior near-to-intermediate term performance potential. Portfolio management emphasizes individual selection of stocks of medium-sized companies across all economic sectors, early in their growth cycles and which portfolio management believes to have the potential to be the blue chips of the future. Portfolio management generally seeks companies that it believes have a leading or dominant position in their niche markets, a high rate of return on invested capital and the ability to finance a major part of future growth from internal sources. Portfolio management follows a disciplined selling process that is designed to lessen risk, and will normally sell a stock when its price reaches portfolio management's expectations or portfolio management believes that there is a material change in the company's fundamentals, other investments offer better opportunities or the market capitalization of a stock is distorting the weighted average market capitalization of the fund. Securities Lending. The fund may lend securities (up to one-third of total assets) to approved institutions.
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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance. Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Medium-sized companies are less widely followed by stock analysts and 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. 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. 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. 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. P> 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. Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price. Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.
Risk Lose Money [Text]	rr_RiskLoseMoney	There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Past Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus. The bar chart and the after-tax returns below are shown for Class A shares (instead of Institutional Class shares, which had been used in the past) because Class A shares now have 10 or more years of annual returns and are available to most investors. For Class S shares, performance prior to class inception is based on the performance of the fund's original share class, Investment Class shares, adjusted to reflect the higher expenses of Class S. Investment Class shares merged into Class S shares on October 20, 2006.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.dws-investments.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Past performance may not indicate future results.
Bar Chart [Heading]	rr_BarChartHeading	CALENDAR YEAR TOTAL RETURNS (%) (Class A)
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	These year-by-year returns do not include sales charges, if any, and would be lower if they did.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter: 21.32%, Q2 2009  Worst Quarter: -32.68%, Q4 2008
Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text]	rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod	The bar chart and the after-tax returns below are shown for Class A shares (instead of Institutional Class shares, which had been used in the past) because Class A shares now have 10 or more years of annual returns and are available to most investors.
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.
DWS Mid Cap Growth Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.24%
Other expenses	rr_OtherExpensesOverAssets	0.42%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.31%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.31%
1 Year	rr_ExpenseExampleYear01	701
3 Years	rr_ExpenseExampleYear03	966
5 Years	rr_ExpenseExampleYear05	1,252
10 Years	rr_ExpenseExampleYear10	2,063
1 Year	rr_ExpenseExampleNoRedemptionYear01	701
3 Years	rr_ExpenseExampleNoRedemptionYear03	966
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,252
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,063
2003	rr_AnnualReturn2003	28.34%
2004	rr_AnnualReturn2004	9.84%
2005	rr_AnnualReturn2005	12.24%
2006	rr_AnnualReturn2006	10.77%
2007	rr_AnnualReturn2007	7.92%
2008	rr_AnnualReturn2008	(50.13%)
2009	rr_AnnualReturn2009	41.13%
2010	rr_AnnualReturn2010	30.85%
2011	rr_AnnualReturn2011	(4.22%)
2012	rr_AnnualReturn2012	8.59%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	21.32%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(32.68%)
DWS Mid Cap Growth 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%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.53%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.18%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.05%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.13%
1 Year	rr_ExpenseExampleYear01	616
3 Years	rr_ExpenseExampleYear03	977
5 Years	rr_ExpenseExampleYear05	1,365
10 Years	rr_ExpenseExampleYear10	2,086
1 Year	rr_ExpenseExampleNoRedemptionYear01	216
3 Years	rr_ExpenseExampleNoRedemptionYear03	677
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,165
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,086
DWS Mid Cap Growth Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	1.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.48%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.13%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.13%
1 Year	rr_ExpenseExampleYear01	316
3 Years	rr_ExpenseExampleYear03	667
5 Years	rr_ExpenseExampleYear05	1,144
10 Years	rr_ExpenseExampleYear10	2,462
1 Year	rr_ExpenseExampleNoRedemptionYear01	216
3 Years	rr_ExpenseExampleNoRedemptionYear03	667
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,144
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,462
DWS Mid Cap Growth Fund | INST Class
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.30%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.95%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.95%
1 Year	rr_ExpenseExampleYear01	97
3 Years	rr_ExpenseExampleYear03	303
5 Years	rr_ExpenseExampleYear05	525
10 Years	rr_ExpenseExampleYear10	1,166
1 Year	rr_ExpenseExampleNoRedemptionYear01	97
3 Years	rr_ExpenseExampleNoRedemptionYear03	303
5 Years	rr_ExpenseExampleNoRedemptionYear05	525
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,166
DWS Mid Cap Growth Fund | Class S
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.38%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.03%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.03%
1 Year	rr_ExpenseExampleYear01	105
3 Years	rr_ExpenseExampleYear03	328
5 Years	rr_ExpenseExampleYear05	569
10 Years	rr_ExpenseExampleYear10	1,259
1 Year	rr_ExpenseExampleNoRedemptionYear01	105
3 Years	rr_ExpenseExampleNoRedemptionYear03	328
5 Years	rr_ExpenseExampleNoRedemptionYear05	569
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,259
DWS Mid Cap Growth Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.34%
5 Years	rr_AverageAnnualReturnYear05	(2.02%)
10 Years	rr_AverageAnnualReturnYear10	5.50%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 28, 2002
DWS Mid Cap Growth Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	4.68%
5 Years	rr_AverageAnnualReturnYear05	(1.88%)
10 Years	rr_AverageAnnualReturnYear10	5.28%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 28, 2002
DWS Mid Cap Growth Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.69%
5 Years	rr_AverageAnnualReturnYear05	(1.66%)
10 Years	rr_AverageAnnualReturnYear10	5.29%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 28, 2002
DWS Mid Cap Growth Fund | before tax | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.01%
5 Years	rr_AverageAnnualReturnYear05	(0.48%)
10 Years	rr_AverageAnnualReturnYear10	6.45%
Class Inception	rr_AverageAnnualReturnInceptionDate	Oct. 12, 1993
DWS Mid Cap Growth Fund | before tax | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.83%
5 Years	rr_AverageAnnualReturnYear05	(0.62%)
10 Years	rr_AverageAnnualReturnYear10	6.33%
Class Inception	rr_AverageAnnualReturnInceptionDate	Feb. 01, 2005
DWS Mid Cap Growth Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.34%
5 Years	rr_AverageAnnualReturnYear05	(2.11%)
10 Years	rr_AverageAnnualReturnYear10	5.23%
DWS Mid Cap Growth Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.52%
5 Years	rr_AverageAnnualReturnYear05	(1.75%)
10 Years	rr_AverageAnnualReturnYear10	4.83%
DWS Mid Cap Growth Fund | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.81%
5 Years	rr_AverageAnnualReturnYear05	3.23%
10 Years	rr_AverageAnnualReturnYear10	10.32%

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS Investment Trust
Prospectus Date	rr_ProspectusDate	Feb. 01, 2013
DWS Small Cap Growth Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Small Cap Growth Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks long-term capital growth.
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. 34) 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	January 31, 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: 81%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	81.00%
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	The Advisor has contractually agreed through January 31, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at ratios no higher than 2.23%, 1.73% and 1.23% (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expenses) for Class B, Class R and Class S, respectively. The agreement may only be terminated with the consent of the fund's Board.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in DWS funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses [(including one year of capped expenses in each period for Class B, Class R and Class S)] remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block]	rr_ExpenseExampleNoRedemptionNarrativeTextBlock	You would pay the following expenses if you did not redeem your shares:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. Under normal circumstances, the fund invests at least 80% of its assets, determined at the time of purchase, in stocks and other securities with equity characteristics of US smaller capitalization companies. For purposes of this 80% investment limitation, the small capitalization equity universe is defined as the bottom 20% of the total domestic equity market capitalization (at the time of initial investment), using a minimum market capitalization of $10 million. As of December 31, 2012, companies in which the fund typically invests have a market capitalization range of between $250 million and $3.0 billion. The fund may also invest in other types of equity securities such as preferred stocks or convertible securities. The fund may invest up to 20% of its assets in the stocks of non-US companies and large capitalization stocks. Management process. In choosing stocks, portfolio management focuses on individual security selection rather than industry selection. Portfolio management uses an active process that combines financial analysis with company visits to evaluate management and strategies. Each portfolio manager has specific sector responsibilities, with investment discretion over securities within sectors. Company research lies at the heart of the investment process. Portfolio management uses a "bottom-up" approach to picking securities, focusing on stocks that it believes have superior growth prospects and above average near-to-intermediate term performance potential. Portfolio management emphasizes individual selection of small and mid-sized company stocks across all economic sectors, early in their growth cycles and which portfolio management believes to have the potential to be the blue chips of the future. Portfolio management generally seeks companies it believes have a leading or dominant position in their niche markets, a high rate of return on invested capital and the ability to finance a major part of future growth from internal sources. Portfolio management also looks for estimated above-average growth in revenues and earnings and a balance sheet that portfolio management believes can support this growth potential with sufficient working capital and manageable levels of debt. Portfolio management follows a disciplined selling process that is designed to lessen risk, and will normally sell a stock when its price reaches portfolio management's expectations or portfolio management believes there is a material change in the company's fundamentals, other investments offer better opportunities or the market capitalization of a stock is distorting the weighted average market capitalization of the fund. Securities Lending. The fund may lend securities (up to one-third of total assets) to approved institutions.
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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance. Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Small companies are less widely followed by stock analysts and 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. Medium-sized companies are less widely followed by stock analysts and 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. 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. 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. 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. 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. Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price. Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.
Risk Lose Money [Text]	rr_RiskLoseMoney	There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Past Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus. Class R does not have a full calendar year of performance available.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Class R does not have a full calendar year of performance available.
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: 25.24%, Q2 2009  Worst Quarter: -32.52%, 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. Index comparisons for Class S and Institutional Class shares began on December 31, 2004.
DWS Small Cap Growth 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	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.24%
Other expenses	rr_OtherExpensesOverAssets	0.57%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.46%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.46%
1 Year	rr_ExpenseExampleYear01	715
3 Years	rr_ExpenseExampleYear03	1,010
5 Years	rr_ExpenseExampleYear05	1,327
10 Years	rr_ExpenseExampleYear10	2,221
1 Year	rr_ExpenseExampleNoRedemptionYear01	715
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,010
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,327
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,221
2003	rr_AnnualReturn2003	21.68%
2004	rr_AnnualReturn2004	13.29%
2005	rr_AnnualReturn2005	6.89%
2006	rr_AnnualReturn2006	4.73%
2007	rr_AnnualReturn2007	5.63%
2008	rr_AnnualReturn2008	(50.39%)
2009	rr_AnnualReturn2009	39.93%
2010	rr_AnnualReturn2010	29.69%
2011	rr_AnnualReturn2011	2.67%
2012	rr_AnnualReturn2012	11.08%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	25.24%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(32.52%)
DWS Small Cap Growth 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	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.82%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.47%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.24%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.23%
1 Year	rr_ExpenseExampleYear01	626
3 Years	rr_ExpenseExampleYear03	1,047
5 Years	rr_ExpenseExampleYear05	1,494
10 Years	rr_ExpenseExampleYear10	2,308
1 Year	rr_ExpenseExampleNoRedemptionYear01	226
3 Years	rr_ExpenseExampleNoRedemptionYear03	747
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,294
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,308
DWS Small Cap Growth 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	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.57%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.22%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	2.22%
1 Year	rr_ExpenseExampleYear01	325
3 Years	rr_ExpenseExampleYear03	694
5 Years	rr_ExpenseExampleYear05	1,190
10 Years	rr_ExpenseExampleYear10	2,554
1 Year	rr_ExpenseExampleNoRedemptionYear01	225
3 Years	rr_ExpenseExampleNoRedemptionYear03	694
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,190
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,554
DWS Small Cap Growth Fund | Class R
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	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	2.31%
Total annual fund operating expenses	rr_ExpensesOverAssets	3.46%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	1.73%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.73%
1 Year	rr_ExpenseExampleYear01	176
3 Years	rr_ExpenseExampleYear03	902
5 Years	rr_ExpenseExampleYear05	1,650
10 Years	rr_ExpenseExampleYear10	3,623
1 Year	rr_ExpenseExampleNoRedemptionYear01	176
3 Years	rr_ExpenseExampleNoRedemptionYear03	902
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,650
10 Years	rr_ExpenseExampleNoRedemptionYear10	3,623
DWS Small Cap Growth 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	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.34%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.99%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.99%
1 Year	rr_ExpenseExampleYear01	101
3 Years	rr_ExpenseExampleYear03	315
5 Years	rr_ExpenseExampleYear05	547
10 Years	rr_ExpenseExampleYear10	1,213
1 Year	rr_ExpenseExampleNoRedemptionYear01	101
3 Years	rr_ExpenseExampleNoRedemptionYear03	315
5 Years	rr_ExpenseExampleNoRedemptionYear05	547
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,213
1 Year	rr_AverageAnnualReturnYear01	11.63%
5 Years	rr_AverageAnnualReturnYear05	0.89%
Since Inception	rr_AverageAnnualReturnSinceInception	3.02%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 20, 2004
DWS Small Cap Growth 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	0.65%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.59%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.24%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.01%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.23%
1 Year	rr_ExpenseExampleYear01	125
3 Years	rr_ExpenseExampleYear03	392
5 Years	rr_ExpenseExampleYear05	680
10 Years	rr_ExpenseExampleYear10	1,499
1 Year	rr_ExpenseExampleNoRedemptionYear01	125
3 Years	rr_ExpenseExampleNoRedemptionYear03	392
5 Years	rr_ExpenseExampleNoRedemptionYear05	680
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,499
1 Year	rr_AverageAnnualReturnYear01	11.36%
5 Years	rr_AverageAnnualReturnYear05	0.79%
Since Inception	rr_AverageAnnualReturnSinceInception	2.93%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 20, 2004
DWS Small Cap Growth Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	4.69%
5 Years	rr_AverageAnnualReturnYear05	(0.65%)
10 Years	rr_AverageAnnualReturnYear10	4.66%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 28, 2002
DWS Small Cap Growth Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.19%
5 Years	rr_AverageAnnualReturnYear05	(0.49%)
10 Years	rr_AverageAnnualReturnYear10	4.46%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 28, 2002
DWS Small Cap Growth Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	10.26%
5 Years	rr_AverageAnnualReturnYear05	(0.23%)
10 Years	rr_AverageAnnualReturnYear10	4.49%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 28, 2002
DWS Small Cap Growth Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	4.69%
5 Years	rr_AverageAnnualReturnYear05	(0.75%)
10 Years	rr_AverageAnnualReturnYear10	4.36%
DWS Small Cap Growth Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	3.05%
5 Years	rr_AverageAnnualReturnYear05	(0.60%)
10 Years	rr_AverageAnnualReturnYear10	4.04%
DWS Small Cap Growth Fund | Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes) | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.59%
5 Years	rr_AverageAnnualReturnYear05	3.49%
10 Years	rr_AverageAnnualReturnYear10	9.80%
DWS Small Cap Growth Fund | Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes) | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.59%
5 Years	rr_AverageAnnualReturnYear05	3.49%
Since Inception	rr_AverageAnnualReturnSinceInception	5.20%

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS Investment Trust
Prospectus Date	rr_ProspectusDate	Feb. 01, 2013
DWS Capital Growth Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Capital Growth Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks to provide long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These are the fees and expenses you may pay when you buy and hold shares. You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in DWS funds. More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 34) 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: 27%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	27.00%
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 Example for Class B reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. The fund normally invests at least 65% of total assets in equities, mainly common stocks of US companies. The fund generally focuses on established companies that are similar in size to the companies in the S&P 500® Index (generally 500 of the largest companies in the US) or the Russell 1000® Growth Index (generally those stocks among the 1,000 largest US companies that have above-average price-to-earnings ratios). As of December 31, 2012, the S&P 500® Index had a median market capitalization of $12.7 billion and the Russell 1000® Growth Index had a median market capitalization of $6.4 billion. Although the fund can invest in companies of any size, the fund intends to invest primarily in companies whose market capitalizations fall within the normal range of these indexes. The fund may also invest in other types of equity securities such as preferred stocks or convertible securities. Management process. In choosing stocks, portfolio management begins by utilizing a proprietary quantitative model to rank stocks based on a number of factors including valuation and profitability. Portfolio management also applies fundamental techniques to seek to identify companies that display above-average earnings growth compared to other companies and that have strong product lines, effective management and leadership positions within core markets. The factors considered and models used by the portfolio managers may change over time. Portfolio management will normally sell a security when it believes the potential risks have increased, its price is unlikely to go higher, its fundamental factors have changed, other investments offer better opportunities or in the course of adjusting the fund's emphasis on a given industry. Securities Lending. The fund may lend securities (up to one-third of total assets) to approved institutions.
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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance. 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. 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. Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Medium-sized companies are less widely followed by stock analysts and 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. Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Small companies are less widely followed by stock analysts and less information about them is available to investors. Industry-wide reversals may have a greater impact on small companies, since they may lack the financial resources of larger companies. Small company stocks are typically less liquid than large company stocks. Foreign investment risk. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments could undermine the value of the fund's investments or prevent the fund from realizing 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. 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. Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price. Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.
Risk Lose Money [Text]	rr_RiskLoseMoney	There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Past Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus. For Class R shares, performance prior to its inception date is based on the historical performance of the fund's original share class (Class AARP), adjusted to reflect the higher expenses of Class R shares.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.dws-investments.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Past performance may not indicate future results.
Bar Chart [Heading]	rr_BarChartHeading	CALENDAR YEAR TOTAL RETURNS (%) (Class A)
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	These year-by-year returns do not include sales charges, if any, and would be lower if they did.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter: 16.27%, Q1 2012  Worst Quarter: -21.28%, 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.
DWS Capital Growth Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund 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	0.24%
Other expenses	rr_OtherExpensesOverAssets	0.32%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.02%
1 Year	rr_ExpenseExampleYear01	673
3 Years	rr_ExpenseExampleYear03	881
5 Years	rr_ExpenseExampleYear05	1,106
10 Years	rr_ExpenseExampleYear10	1,751
1 Year	rr_ExpenseExampleNoRedemptionYear01	673
3 Years	rr_ExpenseExampleNoRedemptionYear03	881
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,106
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,751
2003	rr_AnnualReturn2003	25.99%
2004	rr_AnnualReturn2004	7.10%
2005	rr_AnnualReturn2005	8.16%
2006	rr_AnnualReturn2006	8.06%
2007	rr_AnnualReturn2007	11.98%
2008	rr_AnnualReturn2008	(32.98%)
2009	rr_AnnualReturn2009	25.57%
2010	rr_AnnualReturn2010	15.87%
2011	rr_AnnualReturn2011	(5.21%)
2012	rr_AnnualReturn2012	15.33%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2012
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	16.27%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.28%)
DWS Capital Growth 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%
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	0.51%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.97%
1 Year	rr_ExpenseExampleYear01	600
3 Years	rr_ExpenseExampleYear03	918
5 Years	rr_ExpenseExampleYear05	1,262
10 Years	rr_ExpenseExampleYear10	1,823
1 Year	rr_ExpenseExampleNoRedemptionYear01	200
3 Years	rr_ExpenseExampleNoRedemptionYear03	618
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,062
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,823
DWS Capital Growth Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	1.00%
Account Maintenance Fee (annually, for fund 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	0.32%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.78%
1 Year	rr_ExpenseExampleYear01	281
3 Years	rr_ExpenseExampleYear03	560
5 Years	rr_ExpenseExampleYear05	964
10 Years	rr_ExpenseExampleYear10	2,095
1 Year	rr_ExpenseExampleNoRedemptionYear01	181
3 Years	rr_ExpenseExampleNoRedemptionYear03	560
5 Years	rr_ExpenseExampleNoRedemptionYear05	964
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,095
DWS Capital Growth Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund 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	0.45%
Other expenses	rr_OtherExpensesOverAssets	0.37%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.28%
1 Year	rr_ExpenseExampleYear01	130
3 Years	rr_ExpenseExampleYear03	406
5 Years	rr_ExpenseExampleYear05	702
10 Years	rr_ExpenseExampleYear10	1,545
1 Year	rr_ExpenseExampleNoRedemptionYear01	130
3 Years	rr_ExpenseExampleNoRedemptionYear03	406
5 Years	rr_ExpenseExampleNoRedemptionYear05	702
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,545
DWS Capital Growth Fund | INST Class
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund 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	0.23%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.69%
1 Year	rr_ExpenseExampleYear01	70
3 Years	rr_ExpenseExampleYear03	221
5 Years	rr_ExpenseExampleYear05	384
10 Years	rr_ExpenseExampleYear10	859
1 Year	rr_ExpenseExampleNoRedemptionYear01	70
3 Years	rr_ExpenseExampleNoRedemptionYear03	221
5 Years	rr_ExpenseExampleNoRedemptionYear05	384
10 Years	rr_ExpenseExampleNoRedemptionYear10	859
DWS Capital Growth Fund | Class S
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund 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	0.30%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.76%
1 Year	rr_ExpenseExampleYear01	78
3 Years	rr_ExpenseExampleYear03	243
5 Years	rr_ExpenseExampleYear05	422
10 Years	rr_ExpenseExampleYear10	942
1 Year	rr_ExpenseExampleNoRedemptionYear01	78
3 Years	rr_ExpenseExampleNoRedemptionYear03	243
5 Years	rr_ExpenseExampleNoRedemptionYear05	422
10 Years	rr_ExpenseExampleNoRedemptionYear10	942
DWS Capital Growth Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.70%
5 Years	rr_AverageAnnualReturnYear05	0.09%
10 Years	rr_AverageAnnualReturnYear10	5.90%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Capital Growth Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	11.25%
5 Years	rr_AverageAnnualReturnYear05	0.30%
10 Years	rr_AverageAnnualReturnYear10	5.77%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Capital Growth Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.46%
5 Years	rr_AverageAnnualReturnYear05	0.50%
10 Years	rr_AverageAnnualReturnYear10	5.69%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 25, 2001
DWS Capital Growth Fund | before tax | Class R
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.90%
5 Years	rr_AverageAnnualReturnYear05	1.01%
10 Years	rr_AverageAnnualReturnYear10	6.23%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 03, 2003
DWS Capital Growth Fund | before tax | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.72%
5 Years	rr_AverageAnnualReturnYear05	1.65%
10 Years	rr_AverageAnnualReturnYear10	6.93%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 19, 2002
DWS Capital Growth Fund | before tax | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.65%
5 Years	rr_AverageAnnualReturnYear05	1.56%
10 Years	rr_AverageAnnualReturnYear10	6.80%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 14, 2000
DWS Capital Growth Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.56%
5 Years	rr_AverageAnnualReturnYear05	0.03%
10 Years	rr_AverageAnnualReturnYear10	5.86%
DWS Capital Growth Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.84%
5 Years	rr_AverageAnnualReturnYear05	0.07%
10 Years	rr_AverageAnnualReturnYear10	5.18%
DWS Capital Growth Fund | Russell 1000 Growth Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.26%
5 Years	rr_AverageAnnualReturnYear05	3.12%
10 Years	rr_AverageAnnualReturnYear10	7.52%

XML

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

XML

DWS Capital Growth Fund

DWS Capital Growth Fund

Investment Objective

The fund seeks to provide long-term growth of capital.

Fees and Expenses of the Fund

These are the fees and expenses you may pay when you buy and hold shares. You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in DWS funds. More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 34) 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 Capital Growth Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
Maximum sales charge (load) imposed on purchases, as % of offering price	5.75%	none	none	none	none	none
Maximum deferred sales charge (load), as % of redemption proceeds	none	4.00%	1.00%	none	none	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	20	20	20	none	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 Capital Growth Fund	Class A	Class B	Class C	Class R	INST Class	Class S
Management fee	0.46%	0.46%	0.46%	0.46%	0.46%	0.46%
Distribution/service (12b-1) fees	0.24%	1.00%	1.00%	0.45%	none	none
Other expenses	0.32%	0.51%	0.32%	0.37%	0.23%	0.30%
Total annual fund operating expenses	1.02%	1.97%	1.78%	1.28%	0.69%	0.76%

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 Capital Growth Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
1 Year	673	600	281	130	70	78
3 Years	881	918	560	406	221	243
5 Years	1,106	1,262	964	702	384	422
10 Years	1,751	1,823	2,095	1,545	859	942

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

Expense Example, No Redemption DWS Capital Growth Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
1 Year	673	200	181	130	70	78
3 Years	881	618	560	406	221	243
5 Years	1,106	1,062	964	702	384	422
10 Years	1,751	1,823	2,095	1,545	859	942

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

PORTFOLIO TURNOVER

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

Portfolio turnover rate for fiscal year 2012: 27%.

Principal Investment Strategy

Main investments. The fund normally invests at least 65% of total assets in equities, mainly common stocks of US companies. The fund generally focuses on established companies that are similar in size to the companies in the S&P 500^® Index (generally 500 of the largest companies in the US) or the Russell 1000^® Growth Index (generally those stocks among the 1,000 largest US companies that have above-average price-to-earnings ratios). As of December 31, 2012, the S&P 500^® Index had a median market capitalization of $12.7 billion and the Russell 1000^® Growth Index had a median market capitalization of $6.4 billion. Although the fund can invest in companies of any size, the fund intends to invest primarily in companies whose market capitalizations fall within the normal range of these indexes. The fund may also invest in other types of equity securities such as preferred stocks or convertible securities.

Management process. In choosing stocks, portfolio management begins by utilizing a proprietary quantitative model to rank stocks based on a number of factors including valuation and profitability. Portfolio management also applies fundamental techniques to seek to identify companies that display above-average earnings growth compared to other companies and that have strong product lines, effective management and leadership positions within core markets. The factors considered and models used by the portfolio managers may change over time.

Portfolio management will normally sell a security when it believes the potential risks have increased, its price is unlikely to go higher, its fundamental factors have changed, other investments offer better opportunities or in the course of adjusting the fund's emphasis on a given industry.

Securities Lending. The fund may lend securities (up to one-third of total assets) to approved institutions.

Main Risks

There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments. The fund may not achieve its investment objective, and is not intended to be a complete investment program. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.

Stock market risk. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance.

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.

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.

Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Medium-sized companies are less widely followed by stock analysts and 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.

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

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

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.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price.

Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.

Past Performance

How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

For Class R shares, performance prior to its inception date is based on the historical performance of the fund's original share class (Class AARP), adjusted to reflect the higher expenses of Class R shares.

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: 16.27%, Q1 2012  Worst Quarter: -21.28%, 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.

Average Annual Total Returns DWS Capital Growth Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Jun. 25, 2001	8.70%	0.09%	5.90%
Class A After tax on distributions		8.56%	0.03%	5.86%
Class A After tax on distributions and sale of fund shares		5.84%	0.07%	5.18%
Class B before tax	Jun. 25, 2001	11.25%	0.30%	5.77%
Class C before tax	Jun. 25, 2001	14.46%	0.50%	5.69%
Class R before tax	Nov. 03, 2003	14.90%	1.01%	6.23%
INST Class before tax	Aug. 19, 2002	15.72%	1.65%	6.93%
Class S before tax	Jul. 14, 2000	15.65%	1.56%	6.80%
Russell 1000 Growth Index (reflects no deduction for fees, expenses or taxes)		15.26%	3.12%	7.52%

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS Investment Trust
Prospectus Date	rr_ProspectusDate	Feb. 01, 2013
DWS Core Equity Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	DWS Core Equity Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks long-term growth of capital, current income and growth of 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. 34) 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	January 31, 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: 302%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	302.00%
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	The Advisor has contractually agreed through January 31, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at a ratio no higher than 1.63% (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expenses) for Class R. The agreement may only be terminated with the consent of the fund's Board.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in DWS funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses (including one year of capped expenses in each period for Class R) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block]	rr_ExpenseExampleNoRedemptionNarrativeTextBlock	You would pay the following expenses if you did not redeem your shares:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	Class B converts to Class A after six years; the Example for Class B reflects Class A fees after the conversion.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. Under normal circumstances, the fund invests at least 80% of total assets, determined at the time of purchase, in equities, mainly common stocks. Although the fund can invest in companies of any size and from any country, it invests primarily in large US companies. Portfolio management may favor securities from different industries and companies at different times. At times, the fund's assets may be invested in securities in relatively few industries or sectors. Management process. Portfolio management uses both quantitative and fundamental analysis to evaluate each company's stock price relative to the company's earnings, operating trends, market outlook and other measures of performance potential. Portfolio management will normally sell a stock when it believes the fundamental factors have changed, other investments offer better opportunities or in the course of adjusting the fund's emphasis on or within a given industry. Derivatives. Portfolio management generally may use futures contracts, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions. 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.
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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general 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. 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. Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Medium-sized companies are less widely followed by stock analysts and 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. Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Small companies are less widely followed by stock analysts and 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. Focus risk. To the extent that the fund focuses its investments in particular industries, asset classes or sectors of the economy, any market price movements, regulatory or technological changes, or economic conditions affecting companies in those industries, asset classes or sectors will have a significant impact on the fund's performance. 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. 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. 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. Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price. Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.
Risk Lose Money [Text]	rr_RiskLoseMoney	There are several risk factors that could hurt the fund's performance, cause you to lose money or cause the fund's performance to trail that of other investments.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Past Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus. Class R does not have a full calendar year of performance available. In the table below, the performance figures for Class R shares are based on the performance of the fund's Class S shares adjusted to reflect the higher expenses of Class R.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.dws-investments.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Past performance may not indicate future results.
Bar Chart [Heading]	rr_BarChartHeading	CALENDAR YEAR TOTAL RETURNS (%) (Class A)
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	These year-by-year returns do not include sales charges, if any, and would be lower if they did.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter: 18.25%, Q3 2009  Worst Quarter: -21.99%, 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.
DWS Core Equity Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.36%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.24%
Other expenses	rr_OtherExpensesOverAssets	0.33%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.93%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.93%
1 Year	rr_ExpenseExampleYear01	664
3 Years	rr_ExpenseExampleYear03	854
5 Years	rr_ExpenseExampleYear05	1,060
10 Years	rr_ExpenseExampleYear10	1,652
1 Year	rr_ExpenseExampleNoRedemptionYear01	664
3 Years	rr_ExpenseExampleNoRedemptionYear03	854
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,060
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,652
2003	rr_AnnualReturn2003	26.55%
2004	rr_AnnualReturn2004	9.37%
2005	rr_AnnualReturn2005	5.58%
2006	rr_AnnualReturn2006	13.07%
2007	rr_AnnualReturn2007	0.47%
2008	rr_AnnualReturn2008	(38.74%)
2009	rr_AnnualReturn2009	33.70%
2010	rr_AnnualReturn2010	13.71%
2011	rr_AnnualReturn2011	(0.46%)
2012	rr_AnnualReturn2012	15.40%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	18.25%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.99%)
DWS Core Equity 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%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.36%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.46%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.82%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.82%
1 Year	rr_ExpenseExampleYear01	585
3 Years	rr_ExpenseExampleYear03	873
5 Years	rr_ExpenseExampleYear05	1,185
10 Years	rr_ExpenseExampleYear10	1,688
1 Year	rr_ExpenseExampleNoRedemptionYear01	185
3 Years	rr_ExpenseExampleNoRedemptionYear03	573
5 Years	rr_ExpenseExampleNoRedemptionYear05	985
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,688
DWS Core Equity Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	1.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.36%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.34%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.70%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.70%
1 Year	rr_ExpenseExampleYear01	273
3 Years	rr_ExpenseExampleYear03	536
5 Years	rr_ExpenseExampleYear05	923
10 Years	rr_ExpenseExampleYear10	2,009
1 Year	rr_ExpenseExampleNoRedemptionYear01	173
3 Years	rr_ExpenseExampleNoRedemptionYear03	536
5 Years	rr_ExpenseExampleNoRedemptionYear05	923
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,009
DWS Core Equity Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.36%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	2.43%
Total annual fund operating expenses	rr_ExpensesOverAssets	3.29%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	1.66%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.63%
1 Year	rr_ExpenseExampleYear01	166
3 Years	rr_ExpenseExampleYear03	858
5 Years	rr_ExpenseExampleYear05	1,573
10 Years	rr_ExpenseExampleYear10	3,473
1 Year	rr_ExpenseExampleNoRedemptionYear01	166
3 Years	rr_ExpenseExampleNoRedemptionYear03	858
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,573
10 Years	rr_ExpenseExampleNoRedemptionYear10	3,473
DWS Core Equity Fund | INST Class
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.36%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.19%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.55%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.55%
1 Year	rr_ExpenseExampleYear01	56
3 Years	rr_ExpenseExampleYear03	176
5 Years	rr_ExpenseExampleYear05	307
10 Years	rr_ExpenseExampleYear10	689
1 Year	rr_ExpenseExampleNoRedemptionYear01	56
3 Years	rr_ExpenseExampleNoRedemptionYear03	176
5 Years	rr_ExpenseExampleNoRedemptionYear05	307
10 Years	rr_ExpenseExampleNoRedemptionYear10	689
DWS Core Equity Fund | Class S
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	20
Management fee	rr_ManagementFeesOverAssets	0.36%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.28%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.64%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.64%
1 Year	rr_ExpenseExampleYear01	65
3 Years	rr_ExpenseExampleYear03	205
5 Years	rr_ExpenseExampleYear05	357
10 Years	rr_ExpenseExampleYear10	798
1 Year	rr_ExpenseExampleNoRedemptionYear01	65
3 Years	rr_ExpenseExampleNoRedemptionYear03	205
5 Years	rr_ExpenseExampleNoRedemptionYear05	357
10 Years	rr_ExpenseExampleNoRedemptionYear10	798
DWS Core Equity Fund | before tax | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.77%
5 Years	rr_AverageAnnualReturnYear05	0.17%
10 Years	rr_AverageAnnualReturnYear10	5.29%
Class Inception	rr_AverageAnnualReturnInceptionDate	Aug. 02, 1999
DWS Core Equity Fund | before tax | Class B
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	11.46%
5 Years	rr_AverageAnnualReturnYear05	0.21%
10 Years	rr_AverageAnnualReturnYear10	4.95%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 29, 2000
DWS Core Equity Fund | before tax | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.56%
5 Years	rr_AverageAnnualReturnYear05	0.60%
10 Years	rr_AverageAnnualReturnYear10	5.09%
Class Inception	rr_AverageAnnualReturnInceptionDate	Dec. 29, 2000
DWS Core Equity Fund | before tax | Class R
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.84%
5 Years	rr_AverageAnnualReturnYear05	1.08%
10 Years	rr_AverageAnnualReturnYear10	5.62%
Class Inception	rr_AverageAnnualReturnInceptionDate	May 01, 2012
DWS Core Equity Fund | before tax | INST Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.87%
5 Years	rr_AverageAnnualReturnYear05	1.86%
10 Years	rr_AverageAnnualReturnYear10	6.42%
Class Inception	rr_AverageAnnualReturnInceptionDate	Aug. 19, 2002
DWS Core Equity Fund | before tax | Class S
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.77%
5 Years	rr_AverageAnnualReturnYear05	1.73%
10 Years	rr_AverageAnnualReturnYear10	6.28%
Class Inception	rr_AverageAnnualReturnInceptionDate	May 31, 1929
DWS Core Equity Fund | After tax on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.47%
5 Years	rr_AverageAnnualReturnYear05	(0.05%)
10 Years	rr_AverageAnnualReturnYear10	4.40%
DWS Core Equity Fund | After tax on distributions and sale of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.91%
5 Years	rr_AverageAnnualReturnYear05	0.07%
10 Years	rr_AverageAnnualReturnYear10	4.40%
DWS Core Equity Fund | Russell 1000 Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	16.42%
5 Years	rr_AverageAnnualReturnYear05	1.92%
10 Years	rr_AverageAnnualReturnYear10	7.52%

XML

Document and Entity Information	12 Months Ended
	Feb. 01, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Sep. 30, 2012
Registrant Name	DWS Investment Trust
Central Index Key	0000088064
Amendment Flag	false
Document Creation Date	Jan. 28, 2013
Document Effective Date	Feb. 01, 2013
Prospectus Date	Feb. 01, 2013

XML

DWS Mid Cap Growth Fund

DWS Mid Cap Growth Fund

Investment Objective

The fund seeks long-term capital growth.

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. 34) 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 Mid Cap Growth 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
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 Mid Cap Growth Fund	Class A	Class B	Class C	INST Class	Class S
Management fee	0.65%	0.65%	0.65%	0.65%	0.65%
Distribution/service (12b-1) fees	0.24%	1.00%	1.00%	none	none
Other expenses	0.42%	0.53%	0.48%	0.30%	0.38%
Total annual fund operating expenses	1.31%	2.18%	2.13%	0.95%	1.03%
Fee waiver/expense reimbursement	none	0.05%	none	none	none
Total annual fund operating expenses after fee waiver/expense reimbursement	1.31%	2.13%	2.13%	0.95%	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 2.10%; and for the period from October 1, 2013 through January 31, 2014, at a ratio no higher than 2.13% (in each instance, excluding extraordinary expenses, taxes, brokerage and interest expenses) for Class B. 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 for Class B) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example DWS Mid Cap Growth Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	701	616	316	97	105
3 Years	966	977	667	303	328
5 Years	1,252	1,365	1,144	525	569
10 Years	2,063	2,086	2,462	1,166	1,259

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

Expense Example, No Redemption DWS Mid Cap Growth Fund (USD $)	Class A	Class B	Class C	INST Class	Class S
1 Year	701	216	216	97	105
3 Years	966	677	667	303	328
5 Years	1,252	1,165	1,144	525	569
10 Years	2,063	2,086	2,462	1,166	1,259

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

PORTFOLIO TURNOVER

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

Portfolio turnover rate for fiscal year 2012: 70%.

Principal Investment Strategy

Main investments. Under normal circumstances, the fund invests at least 80% of its assets, determined at the time of purchase, in companies with market caps within the market capitalization range of the Russell Mid Cap Growth Index or securities with equity characteristics that provide exposure to those companies. While the market capitalization range of the Russell Mid Cap Growth Index changes throughout the year, as of the most recent reconstitution date of the index (June 22, 2012), companies in the index had a weighted average market capitalization of approximately $8.57 billion. The fund's equity investments are mainly common stocks, but may also include other types of equity securities such as preferred stocks or convertible securities. The fund may invest up to 20% of its assets in stocks and other securities of companies based outside the US.

Management process. In choosing stocks, portfolio management focuses on individual security selection rather than industry selection. Portfolio management uses an active process that combines financial analysis with company visits to evaluate management and strategies. Each portfolio manager has specific sector responsibilities, with investment discretion over securities within their sectors.

Company research lies at the heart of the investment process. Portfolio management uses a "bottom-up" approach to picking securities, focusing on stocks portfolio management believes to be undervalued, but with fast-growing earnings and superior near-to-intermediate term performance potential.

Portfolio management emphasizes individual selection of stocks of medium-sized companies across all economic sectors, early in their growth cycles and which portfolio management believes to have the potential to be the blue chips of the future. Portfolio management generally seeks companies that it believes have a leading or dominant position in their niche markets, a high rate of return on invested capital and the ability to finance a major part of future growth from internal sources.

Portfolio management follows a disciplined selling process that is designed to lessen risk, and will normally sell a stock when its price reaches portfolio management's expectations or portfolio management believes that there is a material change in the company's fundamentals, other investments offer better opportunities or the market capitalization of a stock is distorting the weighted average market capitalization of the fund.

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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance.

Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Medium-sized companies are less widely followed by stock analysts and 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.

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.

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.

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.

P>

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.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price.

Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.

Past Performance

How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

The bar chart and the after-tax returns below are shown for Class A shares (instead of Institutional Class shares, which had been used in the past) because Class A shares now have 10 or more years of annual returns and are available to most investors.

For Class S shares, performance prior to class inception is based on the performance of the fund's original share class, Investment Class shares, adjusted to reflect the higher expenses of Class S. Investment Class shares merged into Class S shares on October 20, 2006.

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: 21.32%, Q2 2009  Worst Quarter: -32.68%, 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.

Average Annual Total Returns DWS Mid Cap Growth Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Jun. 28, 2002	2.34%	(2.02%)	5.50%
Class A After tax on distributions		2.34%	(2.11%)	5.23%
Class A After tax on distributions and sale of fund shares		1.52%	(1.75%)	4.83%
Class B before tax	Jun. 28, 2002	4.68%	(1.88%)	5.28%
Class C before tax	Jun. 28, 2002	7.69%	(1.66%)	5.29%
INST Class before tax	Oct. 12, 1993	9.01%	(0.48%)	6.45%
Class S before tax	Feb. 01, 2005	8.83%	(0.62%)	6.33%
Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes		15.81%	3.23%	10.32%

XML

DWS Small Cap Growth Fund

DWS Small Cap Growth Fund

Investment Objective

The fund seeks long-term capital growth.

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. 34) 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 Small Cap Growth Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
Maximum sales charge (load) imposed on purchases, as % of offering price	5.75%	none	none	none	none	none
Maximum deferred sales charge (load), as % of redemption proceeds	none	4.00%	1.00%	none	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%	2.00%
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	20	20	20	none	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 Small Cap Growth Fund	Class A	Class B	Class C	Class R	INST Class	Class S
Management fee	0.65%	0.65%	0.65%	0.65%	0.65%	0.65%
Distribution/service (12b-1) fees	0.24%	1.00%	1.00%	0.50%	none	none
Other expenses	0.57%	0.82%	0.57%	2.31%	0.34%	0.59%
Total annual fund operating expenses	1.46%	2.47%	2.22%	3.46%	0.99%	1.24%
Fee waiver/expense reimbursement	none	0.24%	none	1.73%	none	0.01%
Total annual fund operating expenses after fee waiver/expense reimbursement	1.46%	2.23%	2.22%	1.73%	0.99%	1.23%

The Advisor has contractually agreed through January 31, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at ratios no higher than 2.23%, 1.73% and 1.23% (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expenses) for Class B, Class R and Class S, respectively. The agreement may only be terminated with the consent of the fund's Board.

EXAMPLE

This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses [(including one year of capped expenses in each period for Class B, Class R and Class S)] remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example DWS Small Cap Growth Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
1 Year	715	626	325	176	101	125
3 Years	1,010	1,047	694	902	315	392
5 Years	1,327	1,494	1,190	1,650	547	680
10 Years	2,221	2,308	2,554	3,623	1,213	1,499

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

Expense Example, No Redemption DWS Small Cap Growth Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
1 Year	715	226	225	176	101	125
3 Years	1,010	747	694	902	315	392
5 Years	1,327	1,294	1,190	1,650	547	680
10 Years	2,221	2,308	2,554	3,623	1,213	1,499

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

PORTFOLIO TURNOVER

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

Portfolio turnover rate for fiscal year 2012: 81%.

Principal Investment Strategy

Main investments. Under normal circumstances, the fund invests at least 80% of its assets, determined at the time of purchase, in stocks and other securities with equity characteristics of US smaller capitalization companies. For purposes of this 80% investment limitation, the small capitalization equity universe is defined as the bottom 20% of the total domestic equity market capitalization (at the time of initial investment), using a minimum market capitalization of $10 million. As of December 31, 2012, companies in which the fund typically invests have a market capitalization range of between $250 million and $3.0 billion. The fund may also invest in other types of equity securities such as preferred stocks or convertible securities. The fund may invest up to 20% of its assets in the stocks of non-US companies and large capitalization stocks.

Management process. In choosing stocks, portfolio management focuses on individual security selection rather than industry selection. Portfolio management uses an active process that combines financial analysis with company visits to evaluate management and strategies. Each portfolio manager has specific sector responsibilities, with investment discretion over securities within sectors.

Company research lies at the heart of the investment process. Portfolio management uses a "bottom-up" approach to picking securities, focusing on stocks that it believes have superior growth prospects and above average near-to-intermediate term performance potential.

Portfolio management emphasizes individual selection of small and mid-sized company stocks across all economic sectors, early in their growth cycles and which portfolio management believes to have the potential to be the blue chips of the future. Portfolio management generally seeks companies it believes have a leading or dominant position in their niche markets, a high rate of return on invested capital and the ability to finance a major part of future growth from internal sources. Portfolio management also looks for estimated above-average growth in revenues and earnings and a balance sheet that portfolio management believes can support this growth potential with sufficient working capital and manageable levels of debt.

Portfolio management follows a disciplined selling process that is designed to lessen risk, and will normally sell a stock when its price reaches portfolio management's expectations or portfolio management believes there is a material change in the company's fundamentals, other investments offer better opportunities or the market capitalization of a stock is distorting the weighted average market capitalization of the fund.

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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance.

Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Small companies are less widely followed by stock analysts and 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. Medium-sized companies are less widely followed by stock analysts and 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.

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.

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.

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.

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.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price.

Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.

Past Performance

How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

Class R does not have a full calendar year of performance available.

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: 25.24%, Q2 2009  Worst Quarter: -32.52%, 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. Index comparisons for Class S and Institutional Class shares began on December 31, 2004.

Average Annual Total Returns DWS Small Cap Growth Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Jun. 28, 2002	4.69%	(0.65%)	4.66%
Class A After tax on distributions		4.69%	(0.75%)	4.36%
Class A After tax on distributions and sale of fund shares		3.05%	(0.60%)	4.04%
Class B before tax	Jun. 28, 2002	7.19%	(0.49%)	4.46%
Class C before tax	Jun. 28, 2002	10.26%	(0.23%)	4.49%
Class C Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes)		14.59%	3.49%	9.80%

Average Annual Total Returns DWS Small Cap Growth Fund	Class Inception	1 Year	5 Years	Since Inception
INST Class	Dec. 20, 2004	11.63%	0.89%	3.02%
Class S	Dec. 20, 2004	11.36%	0.79%	2.93%
Class S Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes)		14.59%	3.49%	5.20%

XML

DWS Small Cap Core Fund

DWS Small Cap Core Fund

Investment Objective

The fund seeks to provide long-term capital growth.

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. 34) 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 Small Cap Core Fund (USD $)	Class A	Class B	Class C	Class S
Maximum sales charge (load) imposed on purchases, as % of offering price	5.75%	none	none	none
Maximum deferred sales charge (load), as % of redemption proceeds	none	4.00%	1.00%	none
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds	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	20

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

Annual Fund Operating Expenses DWS Small Cap Core Fund	Class A	Class B	Class C	Class S
Management fee	0.67%	0.67%	0.67%	0.67%
Distribution/service (12b-1) fees	0.25%	1.00%	1.00%	none
Other expenses	0.70%	0.72%	0.72%	0.64%
Total annual fund operating expenses	1.62%	2.39%	2.39%	1.31%
Fee waiver/expense reimbursement	0.18%	0.20%	0.20%	0.12%
Total annual fund operating expenses after fee waiver/expense reimbursement	1.44%	2.19%	2.19%	1.19%

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 1.40%, 2.15%, 2.15% and 1.15%; and for the period from October 1, 2013 through January 31, 2014, at ratios no higher than 1.44%, 2.19%, 2.19% and 1.19% (in each instance, excluding extraordinary expenses, taxes, brokerage and interest expenses) for Classes A, B, C and 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 Small Cap Core Fund (USD $)	Class A	Class B	Class C	Class S
1 Year	713	622	322	121
3 Years	1,040	1,026	726	403
5 Years	1,390	1,457	1,257	707
10 Years	2,372	2,344	2,711	1,569

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

Expense Example, No Redemption DWS Small Cap Core Fund (USD $)	Class A	Class B	Class C	Class S
1 Year	713	222	222	121
3 Years	1,040	726	726	403
5 Years	1,390	1,257	1,257	707
10 Years	2,372	2,344	2,711	1,569

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

PORTFOLIO TURNOVER

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

Portfolio turnover rate for fiscal year 2012: 379%.

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 small US companies with potential for above-average long-term capital growth. These companies are similar in size to the companies in the Russell 2000® Index (generally the 2,000 smallest companies out of the 3,000 largest companies in the US). As of December 31, 2012, the median market capitalization of the index was $508 million.

The fund intends to invest in companies whose market capitalizations fall within the normal range of theRussell 2000® Index. While the fund invests primarily in common stocks, it may invest up to 20% of its total assets in US government securities. The fund may also invest in other types of equity securities such as preferred stocks or convertible securities.

Management process. Portfolio management uses a quantitative stock valuation model to compare each company's stock price to the company's earnings, book value, sales and other measures of performance potential. Portfolio management also incorporates technical analysis to capture short-term price changes and evaluate the market's responsiveness to new information. Portfolio management then seeks to build a diversified portfolio of companies that are attractively rated based on its investment process.

Derivatives. Portfolio management generally may use futures contracts, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.

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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general performance.

Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Small companies are less widely followed by stock analysts and 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.

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.

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.

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.

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.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price.

Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.

Past Performance

How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

CALENDAR YEAR TOTAL RETURNS (%) (Class A)

These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.

Best Quarter: 21.83%, Q2 2003  Worst Quarter: -27.55%, 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.

Average Annual Total Returns DWS Small Cap Core Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Jun. 25, 2001	10.83%	0.65%	6.42%
Class A After tax on distributions		10.74%	0.62%	5.03%
Class A After tax on distributions and sale of fund shares		7.14%	0.55%	5.11%
Class B before tax	Jun. 25, 2001	13.70%	0.92%	6.23%
Class C before tax	Jun. 25, 2001	16.74%	1.07%	6.24%
Class S before tax	Jul. 14, 2000	17.85%	2.08%	7.35%
Russell 2000 Index (reflects no deduction for fees, expenses or taxes)		16.35%	3.56%	9.72%

XML

DWS Core Equity Fund

DWS Core Equity Fund

Investment Objective

The fund seeks long-term growth of capital, current income and growth of 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. 34) 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 Core Equity Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
Maximum sales charge (load) imposed on purchases, as % of offering price	5.75%	none	none	none	none	none
Maximum deferred sales charge (load), as % of redemption proceeds	none	4.00%	1.00%	none	none	none
Account Maintenance Fee (annually, for fund balances below $10,000 and subject to certain exceptions)	20	20	20	none	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 Core Equity Fund	Class A	Class B	Class C	Class R	INST Class	Class S
Management fee	0.36%	0.36%	0.36%	0.36%	0.36%	0.36%
Distribution/service (12b-1) fees	0.24%	1.00%	1.00%	0.50%	none	none
Other expenses	0.33%	0.46%	0.34%	2.43%	0.19%	0.28%
Total annual fund operating expenses	0.93%	1.82%	1.70%	3.29%	0.55%	0.64%
Fee waiver/expense reimbursement	none	none	none	1.66%	none	none
Total annual fund operating expenses after fee waiver/expense reimbursement	0.93%	1.82%	1.70%	1.63%	0.55%	0.64%

The Advisor has contractually agreed through January 31, 2014 to waive and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses at a ratio no higher than 1.63% (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expenses) for Class R. The agreement may only be terminated with the consent of the fund's Board.

EXAMPLE

This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses (including one year of capped expenses in each period for Class R) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example DWS Core Equity Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
1 Year	664	585	273	166	56	65
3 Years	854	873	536	858	176	205
5 Years	1,060	1,185	923	1,573	307	357
10 Years	1,652	1,688	2,009	3,473	689	798

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

Expense Example, No Redemption DWS Core Equity Fund (USD $)	Class A	Class B	Class C	Class R	INST Class	Class S
1 Year	664	185	173	166	56	65
3 Years	854	573	536	858	176	205
5 Years	1,060	985	923	1,573	307	357
10 Years	1,652	1,688	2,009	3,473	689	798

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

PORTFOLIO TURNOVER

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

Portfolio turnover rate for fiscal year 2012: 302%.

Principal Investment Strategy

Main investments. Under normal circumstances, the fund invests at least 80% of total assets, determined at the time of purchase, in equities, mainly common stocks. Although the fund can invest in companies of any size and from any country, it invests primarily in large US companies. Portfolio management may favor securities from different industries and companies at different times. At times, the fund's assets may be invested in securities in relatively few industries or sectors.

Management process. Portfolio management uses both quantitative and fundamental analysis to evaluate each company's stock price relative to the company's earnings, operating trends, market outlook and other measures of performance potential.

Portfolio management will normally sell a stock when it believes the fundamental factors have changed, other investments offer better opportunities or in the course of adjusting the fund's emphasis on or within a given industry.

Derivatives. Portfolio management generally may use futures contracts, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.

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. 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. To the extent the fund invests in a particular capitalization or market sector, the fund's performance may be proportionately affected by that segment's general 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.

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.

Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. Medium-sized companies are less widely followed by stock analysts and 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.

Small company risk. Small company stocks tend to be more volatile than medium-sized or large company stocks. Small companies are less widely followed by stock analysts and 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.

Focus risk. To the extent that the fund focuses its investments in particular industries, asset classes or sectors of the economy, any market price movements, regulatory or technological changes, or economic conditions affecting companies in those industries, asset classes or sectors will have a significant impact on the fund's performance.

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.

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.

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.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment in an orderly fashion at an acceptable price.

Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be different than the value realized upon such investment's sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.

Past Performance

How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index). Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. For more recent performance figures, go to www.dws-investments.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

Class R does not have a full calendar year of performance available. In the table below, the performance figures for Class R shares are based on the performance of the fund's Class S shares adjusted to reflect the higher expenses of Class R.

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: 18.25%, Q3 2009  Worst Quarter: -21.99%, 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.

Average Annual Total Returns DWS Core Equity Fund	Class Inception	1 Year	5 Years	10 Years
Class A before tax	Aug. 02, 1999	8.77%	0.17%	5.29%
Class A After tax on distributions		8.47%	(0.05%)	4.40%
Class A After tax on distributions and sale of fund shares		5.91%	0.07%	4.40%
Class B before tax	Dec. 29, 2000	11.46%	0.21%	4.95%
Class C before tax	Dec. 29, 2000	14.56%	0.60%	5.09%
Class R before tax	May 01, 2012	14.84%	1.08%	5.62%
INST Class before tax	Aug. 19, 2002	15.87%	1.86%	6.42%
Class S before tax	May 31, 1929	15.77%	1.73%	6.28%
Russell 1000 Index (reflects no deduction for fees, expenses or taxes)		16.42%	1.92%	7.52%