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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE DWS INVESTMENT TRUST
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS

DWS CROCI® Equity Dividend Fund

The following changes are effective on or about December 1, 2019:

The following information replaces the existing disclosure contained under the "AVERAGE ANNUAL TOTAL RETURNS" sub-heading of the "PAST PERFORMANCE" section of the summary section of the fund's prospectus.

Average Annual Total Returns
(For periods ended 12/31/2018 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.

Class Inception 1 Year 5 Years 10 Years
Class A before tax 3/18/1988 -8.79 5.71 9.80
After tax on distributions -11.22 4.76 9.15
After tax on distributions and sale of fund shares -3.32 4.43 8.06
Class T before tax 6/5/2017 -5.61 6.47 10.28
Class C before tax 9/11/1995 -3.92 6.18 9.62
Class R before tax 10/1/2003 -3.50 6.70 10.14
INST Class before tax 8/19/2002 -2.97 7.25 10.79
Class S before tax 2/28/2005 -3.03 7.23 10.69
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes) -8.27 5.95 11.18
S&P 500® Index (reflects no deduction for fees, expenses or taxes) -4.38 8.49 13.12

Class Inception 1 Year Since Inception
Class R6 before tax 3/2/2015 -2.90 5.83
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes) -8.27 4.16
S&P 500® Index (reflects no deduction for fees, expenses or taxes) -4.38 6.84

The Russell 1000® Value Index has replaced the S&P 500® Index as the fund's primary benchmark index. The Advisor believes that the new index better represents the fund's investment strategy and is therefore more suitable for performance comparison.

DWS CROCI Equity Dividend Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS

DWS CROCI® Equity Dividend Fund

The following changes are effective on or about December 1, 2019:

The following information replaces the existing disclosure contained under the "AVERAGE ANNUAL TOTAL RETURNS" sub-heading of the "PAST PERFORMANCE" section of the summary section of the fund's prospectus.

Average Annual Total Returns
(For periods ended 12/31/2018 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.

Class Inception 1 Year 5 Years 10 Years
Class A before tax 3/18/1988 -8.79 5.71 9.80
After tax on distributions -11.22 4.76 9.15
After tax on distributions and sale of fund shares -3.32 4.43 8.06
Class T before tax 6/5/2017 -5.61 6.47 10.28
Class C before tax 9/11/1995 -3.92 6.18 9.62
Class R before tax 10/1/2003 -3.50 6.70 10.14
INST Class before tax 8/19/2002 -2.97 7.25 10.79
Class S before tax 2/28/2005 -3.03 7.23 10.69
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes) -8.27 5.95 11.18
S&P 500® Index (reflects no deduction for fees, expenses or taxes) -4.38 8.49 13.12

Class Inception 1 Year Since Inception
Class R6 before tax 3/2/2015 -2.90 5.83
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes) -8.27 4.16
S&P 500® Index (reflects no deduction for fees, expenses or taxes) -4.38 6.84

The Russell 1000® Value Index has replaced the S&P 500® Index as the fund's primary benchmark index. The Advisor believes that the new index better represents the fund's investment strategy and is therefore more suitable for performance comparison.

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(For periods ended 12/31/2018 expressed as a %)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged The Russell 1000® Value Index has replaced the S&P 500® Index as the fund's primary benchmark index. The Advisor believes that the new index better represents the fund's investment strategy and is therefore more suitable for performance comparison.
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.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The Russell 1000® Value Index has replaced the S&P 500® Index as the fund's primary benchmark index. The Advisor believes that the new index better represents the fund's investment strategy and is therefore more suitable for performance comparison.

DWS CROCI Equity Dividend Fund | before tax | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (8.79%)
5 Years rr_AverageAnnualReturnYear05 5.71%
10 Years rr_AverageAnnualReturnYear10 9.80%
Class Inception rr_AverageAnnualReturnInceptionDate Mar. 18, 1988
DWS CROCI Equity Dividend Fund | before tax | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (5.61%)
5 Years rr_AverageAnnualReturnYear05 6.47%
10 Years rr_AverageAnnualReturnYear10 10.28%
Class Inception rr_AverageAnnualReturnInceptionDate Jun. 05, 2017
DWS CROCI Equity Dividend Fund | before tax | Class C  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.92%)
5 Years rr_AverageAnnualReturnYear05 6.18%
10 Years rr_AverageAnnualReturnYear10 9.62%
Class Inception rr_AverageAnnualReturnInceptionDate Sep. 11, 1995
DWS CROCI Equity Dividend Fund | before tax | Class R  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.50%)
5 Years rr_AverageAnnualReturnYear05 6.70%
10 Years rr_AverageAnnualReturnYear10 10.14%
Class Inception rr_AverageAnnualReturnInceptionDate Oct. 01, 2003
DWS CROCI Equity Dividend Fund | before tax | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.90%)
Since Inception rr_AverageAnnualReturnSinceInception 5.83%
Class Inception rr_AverageAnnualReturnInceptionDate Mar. 02, 2015
DWS CROCI Equity Dividend Fund | before tax | INST Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.97%)
5 Years rr_AverageAnnualReturnYear05 7.25%
10 Years rr_AverageAnnualReturnYear10 10.79%
Class Inception rr_AverageAnnualReturnInceptionDate Aug. 19, 2002
DWS CROCI Equity Dividend Fund | before tax | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.03%)
5 Years rr_AverageAnnualReturnYear05 7.23%
10 Years rr_AverageAnnualReturnYear10 10.69%
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 28, 2005
DWS CROCI Equity Dividend Fund | After tax on distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (11.22%)
5 Years rr_AverageAnnualReturnYear05 4.76%
10 Years rr_AverageAnnualReturnYear10 9.15%
DWS CROCI Equity Dividend Fund | After tax on distributions and sale of fund shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.32%)
5 Years rr_AverageAnnualReturnYear05 4.43%
10 Years rr_AverageAnnualReturnYear10 8.06%
DWS CROCI Equity Dividend Fund | Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes) | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (8.27%)
Since Inception rr_AverageAnnualReturnSinceInception 4.16%
DWS CROCI Equity Dividend Fund | Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes) | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (8.27%)
5 Years rr_AverageAnnualReturnYear05 5.95%
10 Years rr_AverageAnnualReturnYear10 11.18%
DWS CROCI Equity Dividend Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes) | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.38%)
Since Inception rr_AverageAnnualReturnSinceInception 6.84%
DWS CROCI Equity Dividend Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes) | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.38%)
5 Years rr_AverageAnnualReturnYear05 8.49%
10 Years rr_AverageAnnualReturnYear10 13.12%