497

 RULE 497 DOCUMENT

On behalf of DWS Mid Cap Growth Fund, a series of DWS Investment Trust (the “Fund”), and pursuant to Rule 497(e) under the Securities Act of 1933, as amended (the “Securities Act”), the purpose of this filing is to submit an interactive data file in the manner provided by Rule 405 of Regulation S-T and General Instruction C.3.(g) of Form N-1A.  The interactive data file included as an exhibit to this filing relates to the form of prospectus filed with the Securities and Exchange Commission on behalf of the Fund pursuant to Rule 497(e) under the Securities Act on February 6, 2013; such form of prospectus (accession number 0000088053-13-000147) is incorporated by reference into this Rule 497 Document.

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. 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

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.

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

Document and Entity Information	12 Months Ended
	Feb. 01, 2013
Risk/Return:
Document Type	Other
Document Period End Date	Feb. 06, 2013
Registrant Name	DWS Investment Trust
Central Index Key	0000088064
Amendment Flag	false
Document Creation Date	Feb. 06, 2013
Document Effective Date	Feb. 06, 2013
Prospectus Date	Feb. 01, 2013

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	Feb. 06, 2013