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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE INVESTMENT TRUST
Prospectus Date rr_ProspectusDate Feb. 01, 2015
Deutsche Core Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Deutsche Core Equity Fund

(formerly 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 Deutsche funds. More information about these and other discounts is available from your financial professional and in Choosing a Share Class (p. 35) 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 2014: 44%.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%rr_PortfolioTurnoverRate
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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 Deutsche funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 50,000rr_ExpenseBreakpointMinimumInvestmentRequiredAmount
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Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates

1 "Other expenses" for Class R6 are based on estimated amounts for the current fiscal year.

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. Under normal circumstances, the fund invests at least 80% of total assets, determined at the time of purchase, in equities, mainly common stocks. For purposes of this 80% investment limitation, the term total assets is defined as net assets, plus the amount of any borrowings for investment purposes. 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. In choosing stocks, portfolio management combines quantitative screens with fundamental research. Portfolio management begins by utilizing proprietary quantitative models to rank securities within specific industry groups based on a number of factors, including valuation, momentum, sales growth and profitability. Portfolio management then applies a range of fundamental factors, including macroeconomic views and economic outlook, secular themes and company fundamentals, to construct the portfolio. The fundamental factors considered and quantitative models used by portfolio management may change over time.

Portfolio management will normally sell a stock when it believes the price is unlikely to go higher, the company's fundamentals have changed, other investments offer better opportunities or in the course of adjusting the fund's exposure to 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. The market as a whole may not favor the types of investments the fund makes, which could affect the fund's ability to sell them at an attractive price. To the extent the fund invests in a particular capitalization or sector, the fund's performance may be affected by the general performance of that particular capitalization or sector.

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 the full value of its investments. Financial reporting standards for companies based in foreign markets differ from those in the US. Additionally, foreign securities markets generally are smaller and less liquid than US markets. To the extent that the fund invests in non-US dollar denominated foreign securities, changes in currency exchange rates may affect the US dollar value of foreign securities or the income or gain received on these securities.

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

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

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.

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 deutschefunds.com (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

Class R6 is a new class of shares and therefore does not have a full calendar year of performance available.

The performance figures for Class R shares prior to class inception are based on the historical performance of Class S shares, adjusted to reflect the higher expenses of Class R shares.

Prior to May 31, 2013, the fund had a sub-advisor and a different investment management team that operated with a different investment strategy. Performance would have been different if the fund's current investment strategy had been in effect.

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 R6 is a new class of shares and therefore does not have a full calendar year of performance available.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress deutschefunds.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
Returns Period ending
Best Quarter 18.25% September 30, 2009
Worst Quarter -21.99% December 31, 2008

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
(For periods ended 12/31/2014 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.
Deutsche Core Equity Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
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Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee 20rr_MaximumAccountFee
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Management fee rr_ManagementFeesOverAssets 0.35%rr_ManagementFeesOverAssets
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Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.24%rr_DistributionAndService12b1FeesOverAssets
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Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.30%rr_OtherExpensesOverAssets
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[1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%rr_ExpensesOverAssets
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1 Year rr_ExpenseExampleYear01 661rr_ExpenseExampleYear01
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3 Years rr_ExpenseExampleYear03 843rr_ExpenseExampleYear03
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5 Years rr_ExpenseExampleYear05 1,040rr_ExpenseExampleYear05
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10 Years rr_ExpenseExampleYear10 1,608rr_ExpenseExampleYear10
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1 Year rr_ExpenseExampleNoRedemptionYear01 661rr_ExpenseExampleNoRedemptionYear01
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3 Years rr_ExpenseExampleNoRedemptionYear03 843rr_ExpenseExampleNoRedemptionYear03
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5 Years rr_ExpenseExampleNoRedemptionYear05 1,040rr_ExpenseExampleNoRedemptionYear05
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10 Years rr_ExpenseExampleNoRedemptionYear10 1,608rr_ExpenseExampleNoRedemptionYear10
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2005 rr_AnnualReturn2005 5.58%rr_AnnualReturn2005
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2006 rr_AnnualReturn2006 13.07%rr_AnnualReturn2006
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2007 rr_AnnualReturn2007 0.47%rr_AnnualReturn2007
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2008 rr_AnnualReturn2008 (38.74%)rr_AnnualReturn2008
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2009 rr_AnnualReturn2009 33.70%rr_AnnualReturn2009
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2010 rr_AnnualReturn2010 13.71%rr_AnnualReturn2010
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2011 rr_AnnualReturn2011 (0.46%)rr_AnnualReturn2011
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2012 rr_AnnualReturn2012 15.40%rr_AnnualReturn2012
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2013 rr_AnnualReturn2013 36.84%rr_AnnualReturn2013
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2014 rr_AnnualReturn2014 11.26%rr_AnnualReturn2014
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Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.25%rr_BarChartHighestQuarterlyReturn
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Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.99%)rr_BarChartLowestQuarterlyReturn
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Deutsche 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%rr_MaximumDeferredSalesChargeOverOther
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Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee 20rr_MaximumAccountFee
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Management fee rr_ManagementFeesOverAssets 0.35%rr_ManagementFeesOverAssets
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Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.99%rr_DistributionAndService12b1FeesOverAssets
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Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.43%rr_OtherExpensesOverAssets
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[1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.77%rr_ExpensesOverAssets
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1 Year rr_ExpenseExampleYear01 580rr_ExpenseExampleYear01
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3 Years rr_ExpenseExampleYear03 857rr_ExpenseExampleYear03
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5 Years rr_ExpenseExampleYear05 1,159rr_ExpenseExampleYear05
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10 Years rr_ExpenseExampleYear10 1,638rr_ExpenseExampleYear10
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1 Year rr_ExpenseExampleNoRedemptionYear01 180rr_ExpenseExampleNoRedemptionYear01
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3 Years rr_ExpenseExampleNoRedemptionYear03 557rr_ExpenseExampleNoRedemptionYear03
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5 Years rr_ExpenseExampleNoRedemptionYear05 959rr_ExpenseExampleNoRedemptionYear05
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10 Years rr_ExpenseExampleNoRedemptionYear10 1,638rr_ExpenseExampleNoRedemptionYear10
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Deutsche 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%rr_MaximumDeferredSalesChargeOverOther
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Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee 20rr_MaximumAccountFee
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Management fee rr_ManagementFeesOverAssets 0.35%rr_ManagementFeesOverAssets
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Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.99%rr_DistributionAndService12b1FeesOverAssets
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Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%rr_OtherExpensesOverAssets
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Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.66%rr_ExpensesOverAssets
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1 Year rr_ExpenseExampleYear01 269rr_ExpenseExampleYear01
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3 Years rr_ExpenseExampleYear03 523rr_ExpenseExampleYear03
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5 Years rr_ExpenseExampleYear05 902rr_ExpenseExampleYear05
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10 Years rr_ExpenseExampleYear10 1,965rr_ExpenseExampleYear10
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1 Year rr_ExpenseExampleNoRedemptionYear01 169rr_ExpenseExampleNoRedemptionYear01
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3 Years rr_ExpenseExampleNoRedemptionYear03 523rr_ExpenseExampleNoRedemptionYear03
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5 Years rr_ExpenseExampleNoRedemptionYear05 902rr_ExpenseExampleNoRedemptionYear05
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10 Years rr_ExpenseExampleNoRedemptionYear10 1,965rr_ExpenseExampleNoRedemptionYear10
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Deutsche 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 account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.35%rr_ManagementFeesOverAssets
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Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%rr_DistributionAndService12b1FeesOverAssets
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Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.56%rr_OtherExpensesOverAssets
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Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.41%rr_ExpensesOverAssets
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1 Year rr_ExpenseExampleYear01 244rr_ExpenseExampleYear01
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3 Years rr_ExpenseExampleYear03 751rr_ExpenseExampleYear03
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5 Years rr_ExpenseExampleYear05 1,285rr_ExpenseExampleYear05
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10 Years rr_ExpenseExampleYear10 2,746rr_ExpenseExampleYear10
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1 Year rr_ExpenseExampleNoRedemptionYear01 244rr_ExpenseExampleNoRedemptionYear01
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3 Years rr_ExpenseExampleNoRedemptionYear03 751rr_ExpenseExampleNoRedemptionYear03
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5 Years rr_ExpenseExampleNoRedemptionYear05 1,285rr_ExpenseExampleNoRedemptionYear05
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10 Years rr_ExpenseExampleNoRedemptionYear10 2,746rr_ExpenseExampleNoRedemptionYear10
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Deutsche Core Equity Fund | Class R6  
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 account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.35%rr_ManagementFeesOverAssets
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Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
[1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.48%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
1 Year rr_ExpenseExampleYear01 49rr_ExpenseExampleYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
3 Years rr_ExpenseExampleYear03 154rr_ExpenseExampleYear03
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
5 Years rr_ExpenseExampleYear05 269rr_ExpenseExampleYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
10 Years rr_ExpenseExampleYear10 604rr_ExpenseExampleYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
1 Year rr_ExpenseExampleNoRedemptionYear01 49rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
3 Years rr_ExpenseExampleNoRedemptionYear03 154rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
5 Years rr_ExpenseExampleNoRedemptionYear05 269rr_ExpenseExampleNoRedemptionYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
10 Years rr_ExpenseExampleNoRedemptionYear10 604rr_ExpenseExampleNoRedemptionYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000148203Member
Deutsche 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 account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.35%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
[1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.53%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
1 Year rr_ExpenseExampleYear01 54rr_ExpenseExampleYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
3 Years rr_ExpenseExampleYear03 170rr_ExpenseExampleYear03
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
5 Years rr_ExpenseExampleYear05 296rr_ExpenseExampleYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
10 Years rr_ExpenseExampleYear10 665rr_ExpenseExampleYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
1 Year rr_ExpenseExampleNoRedemptionYear01 54rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
3 Years rr_ExpenseExampleNoRedemptionYear03 170rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
5 Years rr_ExpenseExampleNoRedemptionYear05 296rr_ExpenseExampleNoRedemptionYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
10 Years rr_ExpenseExampleNoRedemptionYear10 665rr_ExpenseExampleNoRedemptionYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
Deutsche 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 account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee 20rr_MaximumAccountFee
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
Management fee rr_ManagementFeesOverAssets 0.35%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
[1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.59%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
1 Year rr_ExpenseExampleYear01 60rr_ExpenseExampleYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
3 Years rr_ExpenseExampleYear03 189rr_ExpenseExampleYear03
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
5 Years rr_ExpenseExampleYear05 329rr_ExpenseExampleYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
10 Years rr_ExpenseExampleYear10 738rr_ExpenseExampleYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
1 Year rr_ExpenseExampleNoRedemptionYear01 60rr_ExpenseExampleNoRedemptionYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
3 Years rr_ExpenseExampleNoRedemptionYear03 189rr_ExpenseExampleNoRedemptionYear03
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
5 Years rr_ExpenseExampleNoRedemptionYear05 329rr_ExpenseExampleNoRedemptionYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
10 Years rr_ExpenseExampleNoRedemptionYear10 738rr_ExpenseExampleNoRedemptionYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
Deutsche Core Equity Fund | before tax | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.86%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
5 Years rr_AverageAnnualReturnYear05 13.39%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
10 Years rr_AverageAnnualReturnYear10 6.30%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
Class Inception rr_AverageAnnualReturnInceptionDate Aug. 02, 1999
Deutsche Core Equity Fund | before tax | Class B  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.29%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015679Member
5 Years rr_AverageAnnualReturnYear05 13.57%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015679Member
10 Years rr_AverageAnnualReturnYear10 5.94%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015679Member
Class Inception rr_AverageAnnualReturnInceptionDate Dec. 29, 2000
Deutsche Core Equity Fund | before tax | Class C  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.37%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015680Member
5 Years rr_AverageAnnualReturnYear05 13.86%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015680Member
10 Years rr_AverageAnnualReturnYear10 6.10%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015680Member
Class Inception rr_AverageAnnualReturnInceptionDate Dec. 29, 2000
Deutsche Core Equity Fund | before tax | Class R  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.58%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015681Member
5 Years rr_AverageAnnualReturnYear05 14.23%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015681Member
10 Years rr_AverageAnnualReturnYear10 6.56%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015681Member
Class Inception rr_AverageAnnualReturnInceptionDate May 01, 2012
Deutsche Core Equity Fund | before tax | INST Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.65%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
5 Years rr_AverageAnnualReturnYear05 15.23%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
10 Years rr_AverageAnnualReturnYear10 7.42%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015683Member
Class Inception rr_AverageAnnualReturnInceptionDate Aug. 19, 2002
Deutsche Core Equity Fund | before tax | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.60%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
5 Years rr_AverageAnnualReturnYear05 15.12%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
10 Years rr_AverageAnnualReturnYear10 7.29%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_beforetaxMember
/ rr_ProspectusShareClassAxis
= dit_C000015682Member
Class Inception rr_AverageAnnualReturnInceptionDate May 31, 1929
Deutsche Core Equity Fund | After tax on distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.52%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_AftertaxondistributionsMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
5 Years rr_AverageAnnualReturnYear05 12.32%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_AftertaxondistributionsMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
10 Years rr_AverageAnnualReturnYear10 4.99%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_AftertaxondistributionsMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
Deutsche Core Equity Fund | After tax on distributions and sale of fund shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.32%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_AftertaxondistributionsandsaleoffundsharesMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
5 Years rr_AverageAnnualReturnYear05 10.49%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_AftertaxondistributionsandsaleoffundsharesMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
10 Years rr_AverageAnnualReturnYear10 4.84%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_AftertaxondistributionsandsaleoffundsharesMember
/ rr_ProspectusShareClassAxis
= dit_C000015677Member
Deutsche Core Equity Fund | Russell 1000 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.24%rr_AverageAnnualReturnYear01
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_Russell1000IndexMember
5 Years rr_AverageAnnualReturnYear05 15.64%rr_AverageAnnualReturnYear05
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_Russell1000IndexMember
10 Years rr_AverageAnnualReturnYear10 7.96%rr_AverageAnnualReturnYear10
/ dei_LegalEntityAxis
= dit_S000005706Member
/ rr_PerformanceMeasureAxis
= dit_Russell1000IndexMember
[1] "Other expenses" for Class R6 are based on estimated amounts for the current fiscal year.