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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE INVESTMENT TRUST
Prospectus Date rr_ProspectusDate Feb. 01, 2018
Deutsche Capital Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Deutsche Capital Growth Fund
Objective [Heading] rr_ObjectiveHeading

Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

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

Expense [Heading] rr_ExpenseHeading

Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

These are the fees and expenses you may pay when you buy and hold shares. You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in Class A shares in Deutsche funds or if you invest at least $250,000 in Class T shares in the fund. More information about these and other discounts and waivers is available from your financial advisor and in Choosing a Share Class (p. 36), Sales Charge Waivers and Discounts Available Through Intermediaries (Appendix B, p. 95) and Purchase and Redemption of Shares in the fund's Statement of Additional Information (SAI) (p. II-16).
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 2017: 17%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 17.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your immediate family invest, or agree to invest in the future, at least $50,000 in Class A shares in Deutsche funds or if you invest at least $250,000 in Class T shares in the fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates

1 "Other expenses" for Class T 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:
Strategy [Heading] rr_StrategyHeading

Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Main investments. The fund normally invests at least 65% of total assets in equities, mainly common stocks of US companies. The fund generally focuses on established companies that are similar in size to the companies in the S&P 500® Index (generally 500 of the largest companies in the US) or the Russell 1000® Growth Index (generally those stocks among the 1,000 largest US companies that have relatively higher price-to-earnings ratios and higher forecasted growth values). While the market capitalization ranges of the S&P 500® Index and the Russell 1000® Growth Index change throughout the year, as of December 31, 2017, the market capitalization range of the S&P 500® Index was between $3.4 billion and $868 billion and the market capitalization range of the Russell 1000® Growth Index was between $654 million and $868 billion. The S&P 500® Index is rebalanced quarterly on the third Friday of March, June, September and December. The Russell 1000® Growth Index is reconstituted annually every June. Although the fund can invest in companies of any size, the fund intends to invest primarily in companies whose market capitalizations fall within the normal range of these indexes. The fund may also invest in other types of equity securities such as preferred stocks or convertible securities. The fund may also invest to a limited extent in companies outside the US.

Management process. Portfolio management aims to add value through stock selection. In choosing securities, portfolio management employs a risk-balanced bottom-up selection process to identify companies it believes are well-positioned and that have above average and sustainable growth potential.

Portfolio management utilizes a proprietary investment process designed to identify attractive investments by utilizing proprietary research conducted by in-house analysts. The investment process also takes into consideration various valuation metrics to assess the attractiveness of stocks and assists portfolio management in devising allocations among investable securities.

All investment decisions are made within risk parameters set by portfolio management. Portfolio management may favor different types of securities from different industries and companies at different times.

Portfolio management will normally sell a stock when its price fully reflects portfolio management's estimate of its fundamental value, its fundamentals have deteriorated, other investments offer better opportunities or in the course of adjusting the fund's exposure to a given sector.

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. The market as a whole may not favor the types of investments the fund makes, which could adversely affect a stock's price, regardless of how well the company performs, or the fund's ability to sell a stock at an attractive price. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility which could negatively affect performance. 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.

Growth investing risk. As a category, growth stocks may underperform value stocks (and the stock market as a whole) over any period of time. Because the prices of growth stocks are based largely on the expectation of future earnings, growth stock prices can decline rapidly and significantly in reaction to negative news about such factors as earnings, the economy, political developments, or other news.

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

Medium-sized company risk. Medium-sized company stocks tend to be more volatile than large company stocks. 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 may have a significant impact on the fund's performance.

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. In June 2016, citizens of the United Kingdom approved a referendum to leave the European Union (EU) and in March 2017, the United Kingdom initiated its withdrawal from the EU, which is expected to take place by March 2019. Significant uncertainty exists regarding the United Kingdom's anticipated withdrawal from the EU and any adverse economic and political effects such withdrawal may have on the United Kingdom, other EU countries and the global economy.

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

Securities lending risk. Any decline in the value of a portfolio security that occurs while the security is out on loan is borne by the fund and will adversely affect performance. Also, there may be delays in recovery of securities loaned or even a loss of rights in the collateral should the borrower of the securities fail financially while holding the security.

Counterparty risk. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund.

Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment 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.

Class T is a new class of shares and as of the date of this prospectus had not commenced investment operations. The performance figures for Class T shares are based on the historical performance of the fund's Institutional Class shares adjusted to reflect the higher expenses and applicable sales charges of Class T.

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 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 16.27% March 31, 2012
Worst Quarter -21.28% December 31, 2008

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
(For periods ended 12/31/2017 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 Capital Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.46%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.23%
Other expenses rr_OtherExpensesOverAssets 0.27% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
1 Year rr_ExpenseExampleYear01 $ 667
3 Years rr_ExpenseExampleYear03 863
5 Years rr_ExpenseExampleYear05 1,075
10 Years rr_ExpenseExampleYear10 1,685
1 Year rr_ExpenseExampleNoRedemptionYear01 667
3 Years rr_ExpenseExampleNoRedemptionYear03 863
5 Years rr_ExpenseExampleNoRedemptionYear05 1,075
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,685
2008 rr_AnnualReturn2008 (32.98%)
2009 rr_AnnualReturn2009 25.57%
2010 rr_AnnualReturn2010 15.87%
2011 rr_AnnualReturn2011 (5.21%)
2012 rr_AnnualReturn2012 15.33%
2013 rr_AnnualReturn2013 33.98%
2014 rr_AnnualReturn2014 12.45%
2015 rr_AnnualReturn2015 8.08%
2016 rr_AnnualReturn2016 3.65%
2017 rr_AnnualReturn2017 25.94%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.27%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.28%)
Deutsche Capital Growth Fund | Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
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 0.46%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.32% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.03%
1 Year rr_ExpenseExampleYear01 $ 352
3 Years rr_ExpenseExampleYear03 570
5 Years rr_ExpenseExampleYear05 804
10 Years rr_ExpenseExampleYear10 1,478
1 Year rr_ExpenseExampleNoRedemptionYear01 352
3 Years rr_ExpenseExampleNoRedemptionYear03 570
5 Years rr_ExpenseExampleNoRedemptionYear05 804
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,478
Deutsche Capital Growth Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther 1.00%
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.46%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.38% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.84%
1 Year rr_ExpenseExampleYear01 $ 287
3 Years rr_ExpenseExampleYear03 579
5 Years rr_ExpenseExampleYear05 996
10 Years rr_ExpenseExampleYear10 2,159
1 Year rr_ExpenseExampleNoRedemptionYear01 187
3 Years rr_ExpenseExampleNoRedemptionYear03 579
5 Years rr_ExpenseExampleNoRedemptionYear05 996
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,159
Deutsche Capital Growth Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.46%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.41% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.37%
1 Year rr_ExpenseExampleYear01 $ 139
3 Years rr_ExpenseExampleYear03 434
5 Years rr_ExpenseExampleYear05 750
10 Years rr_ExpenseExampleYear10 1,646
1 Year rr_ExpenseExampleNoRedemptionYear01 139
3 Years rr_ExpenseExampleNoRedemptionYear03 434
5 Years rr_ExpenseExampleNoRedemptionYear05 750
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,646
Deutsche Capital Growth 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 0.46%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.19% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.65%
1 Year rr_ExpenseExampleYear01 $ 66
3 Years rr_ExpenseExampleYear03 208
5 Years rr_ExpenseExampleYear05 362
10 Years rr_ExpenseExampleYear10 810
1 Year rr_ExpenseExampleNoRedemptionYear01 66
3 Years rr_ExpenseExampleNoRedemptionYear03 208
5 Years rr_ExpenseExampleNoRedemptionYear05 362
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 810
Deutsche Capital Growth Fund | INST Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.46%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.27% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.73%
1 Year rr_ExpenseExampleYear01 $ 75
3 Years rr_ExpenseExampleYear03 233
5 Years rr_ExpenseExampleYear05 406
10 Years rr_ExpenseExampleYear10 906
1 Year rr_ExpenseExampleNoRedemptionYear01 75
3 Years rr_ExpenseExampleNoRedemptionYear03 233
5 Years rr_ExpenseExampleNoRedemptionYear05 406
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 906
Deutsche Capital Growth Fund | Class S  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases, as % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load), as % of redemption proceeds rr_MaximumDeferredSalesChargeOverOther none
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.46%
Distribution/service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.25% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.71%
1 Year rr_ExpenseExampleYear01 $ 73
3 Years rr_ExpenseExampleYear03 227
5 Years rr_ExpenseExampleYear05 395
10 Years rr_ExpenseExampleYear10 883
1 Year rr_ExpenseExampleNoRedemptionYear01 73
3 Years rr_ExpenseExampleNoRedemptionYear03 227
5 Years rr_ExpenseExampleNoRedemptionYear05 395
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 883
Deutsche Capital Growth Fund | before tax | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.70%
5 Years rr_AverageAnnualReturnYear05 14.91%
10 Years rr_AverageAnnualReturnYear10 7.88%
Class Inception rr_AverageAnnualReturnInceptionDate Jun. 25, 2001
Deutsche Capital Growth Fund | before tax | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.65%
5 Years rr_AverageAnnualReturnYear05 15.62%
10 Years rr_AverageAnnualReturnYear10 8.24%
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 01, 2017
Deutsche Capital Growth Fund | before tax | Class C  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 24.83%
5 Years rr_AverageAnnualReturnYear05 15.33%
10 Years rr_AverageAnnualReturnYear10 7.66%
Class Inception rr_AverageAnnualReturnInceptionDate Jun. 25, 2001
Deutsche Capital Growth Fund | before tax | Class R  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.42%
5 Years rr_AverageAnnualReturnYear05 15.82%
10 Years rr_AverageAnnualReturnYear10 8.16%
Class Inception rr_AverageAnnualReturnInceptionDate Nov. 03, 2003
Deutsche Capital Growth Fund | before tax | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.34%
Since Inception rr_AverageAnnualReturnSinceInception 12.52%
Class Inception rr_AverageAnnualReturnInceptionDate Aug. 25, 2014
Deutsche Capital Growth Fund | before tax | INST Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.20%
5 Years rr_AverageAnnualReturnYear05 16.58%
10 Years rr_AverageAnnualReturnYear10 8.86%
Class Inception rr_AverageAnnualReturnInceptionDate Aug. 19, 2002
Deutsche Capital Growth Fund | before tax | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.26%
5 Years rr_AverageAnnualReturnYear05 16.57%
10 Years rr_AverageAnnualReturnYear10 8.81%
Class Inception rr_AverageAnnualReturnInceptionDate Jul. 14, 2000
Deutsche Capital Growth Fund | After tax on distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.20%
5 Years rr_AverageAnnualReturnYear05 12.35%
10 Years rr_AverageAnnualReturnYear10 6.64%
Deutsche Capital Growth Fund | After tax on distributions and sale of fund shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.49%
5 Years rr_AverageAnnualReturnYear05 11.63%
10 Years rr_AverageAnnualReturnYear10 6.24%
Deutsche Capital Growth Fund | Russell 1000 Growth Index (reflects no deduction for fees, expenses or taxes) | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 30.21%
Since Inception rr_AverageAnnualReturnSinceInception 13.57%
Deutsche Capital Growth Fund | Russell 1000 Growth Index (reflects no deduction for fees, expenses or taxes) | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 30.21%
5 Years rr_AverageAnnualReturnYear05 17.33%
10 Years rr_AverageAnnualReturnYear10 10.00%
[1] "Other expenses" for Class T are based on estimated amounts for the current fiscal year.