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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE INVESTMENT TRUST
Prospectus Date rr_ProspectusDate Jun. 01, 2016
Small Cap Core INST | Deutsche Small Cap Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Deutsche 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.
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 May 31, 2017
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 2015: 52%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.00%
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock

The Advisor has contractually agreed through May 31, 2017 to waive its fees and/or reimburse fund expenses to the extent necessary to maintain the fund's total annual operating expenses (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expense) at 1.01% for Institutional Class. The agreement may only be terminated with the consent of the fund's Board.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates

1 "Other expenses" for Institutional Class 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 (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:
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, 2015, the median market capitalization of the index was $687 million.

The fund intends to invest in companies whose market capitalizations fall within the normal range of the Russell 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 an active process that combines financial analysis with an assessment of corporate strategy and management quality. Portfolio management focuses on stocks that they believe are undervalued relative to their intrinsic worth. Portfolio management considers various fundamental factors including, but not limited to, free cash flow yield and return on invested capital in seeking to identify undervalued securities.

Portfolio management generally seeks companies that it believes have high returns on invested capital, strong corporate governance practices and conservative accounting. Portfolio management prefers companies that demonstrate sustainable and growing cash flows. The fund's portfolio is assembled on a stock-by-stock basis and sector weights are not predetermined by a benchmark.

Portfolio management will normally sell a stock when its price reaches portfolio management's expectations or portfolio management believes there has been a deterioration in the company's fundamental value. A stock may also be sold when portfolio management believes that other investments offer better opportunities.

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.

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.

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.

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 may 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.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment and/or the fund may sell certain investments at a price or time that is not advantageous in order to meet redemption requests or other cash needs. Unusual market conditions, such as an unusually high volume of redemptions or other similar conditions could increase liquidity risk for the fund.

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 from 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.

Operational and technology risk. Cyber-attacks, disruptions, or failures that affect the fund's service providers or counterparties, issuers of securities held by the fund, or other market participants may adversely affect the fund and its shareholders, including by causing losses for the fund or impairing fund operations.
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 and distributions 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.

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.

Institutional Class is a new class of shares and therefore does not have a full calendar year of performance available. In the bar chart and table below, the performance figures reflect the historical performance of Class S. Class S shares are invested in the same portfolio of securities as Institutional Class and would have had similar performance. Performance would differ only to the extent that Institutional Class and Class S do not have the same fees and expenses. Class S commenced operations on July 14, 2000 and is offered in a separate 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 One Year or Less [Text] rr_PerformanceOneYearOrLess Institutional Class 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 S
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 19.02% September 30, 2009
Worst Quarter -27.59% December 31, 2008
Year-to-Date 3.53% March 31, 2016

Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus In the bar chart and table below, the performance figures reflect the historical performance of Class S. Class S shares are invested in the same portfolio of securities as Institutional Class and would have had similar performance. Performance would differ only to the extent that Institutional Class and Class S do not have the same fees and expenses. Class S commenced operations on July 14, 2000 and is offered in a separate prospectus.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
(For periods ended 12/31/2015 expressed as a %)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns (which are shown only for Class S 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 S and would be different for other classes)
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns (which are shown only for Class S 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.
Small Cap Core INST | Deutsche Small Cap Core Fund | INST Class  
Risk/Return: rr_RiskReturnAbstract  
Redemption/exchange fee on shares owned less than 15 days, as % of redemption proceeds rr_RedemptionFeeOverRedemption 2.00%
Management fee rr_ManagementFeesOverAssets 0.67%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.40% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.07%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.06%
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 1.01%
1 Year rr_ExpenseExampleYear01 $ 103
3 Years rr_ExpenseExampleYear03 334
5 Years rr_ExpenseExampleYear05 584
10 Years rr_ExpenseExampleYear10 $ 1,300
Small Cap Core INST | Deutsche Small Cap Core Fund | Class S  
Risk/Return: rr_RiskReturnAbstract  
2006 rr_AnnualReturn2006 15.64%
2007 rr_AnnualReturn2007 (11.31%)
2008 rr_AnnualReturn2008 (38.30%)
2009 rr_AnnualReturn2009 28.86%
2010 rr_AnnualReturn2010 21.08%
2011 rr_AnnualReturn2011 (2.29%)
2012 rr_AnnualReturn2012 17.85%
2013 rr_AnnualReturn2013 42.76%
2014 rr_AnnualReturn2014 1.96%
2015 rr_AnnualReturn2015 (1.79%)
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2016
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.53%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.02%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (27.59%)
Small Cap Core INST | Deutsche Small Cap Core Fund | before tax | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.79%)
5 Years rr_AverageAnnualReturnYear05 10.49%
10 Years rr_AverageAnnualReturnYear10 4.98%
Class Inception rr_AverageAnnualReturnInceptionDate Jul. 14, 2000
Small Cap Core INST | Deutsche Small Cap Core Fund | After tax on distributions | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.82%)
5 Years rr_AverageAnnualReturnYear05 9.44%
10 Years rr_AverageAnnualReturnYear10 3.81%
Small Cap Core INST | Deutsche Small Cap Core Fund | After tax on distributions and sale of fund shares | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.41%
5 Years rr_AverageAnnualReturnYear05 8.14%
10 Years rr_AverageAnnualReturnYear10 3.71%
Small Cap Core INST | Deutsche Small Cap Core Fund | Russell 2000 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.41%)
5 Years rr_AverageAnnualReturnYear05 9.19%
10 Years rr_AverageAnnualReturnYear10 6.80%
[1] "Other expenses" for Institutional Class are based on estimated amounts for the current fiscal year.