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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DEUTSCHE DWS MUNICIPAL TRUST
Prospectus Date rr_ProspectusDate Feb. 01, 2020
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS

DWS Short-Term Municipal Bond Fund

Class A

The following changes are effective on July 15, 2020:

Effective on July 15, 2020 the following information replaces similar existing disclosure contained in the "PAST PERFORMANCE" section of the summary section of the fund's prospectus:

Class Inception 1 Year 5 Years 10 Years
Class A before tax* 2/28/2003 0.96 0.73 1.05
After tax on distributions 0.90 0.72 1.04
After tax on distributions and sale of fund shares 1.13 0.86 1.10
Class T before tax 2/1/2017 0.70 0.68 1.02
Class C before tax 2/28/2003 2.51 0.43 0.52
INST Class before tax 3/6/1995 3.54 1.45 1.53
Class S before tax 2/28/2005 3.34 1.32 1.42
Bloomberg Barclays 1-Year General Obligation Index (reflects no deduction for fees, expenses or taxes) 2.46 1.20 1.06
Bloomberg Barclays 3-Year (2-4) Municipal Bond Index (reflects no deduction for fees, expenses or taxes) 3.67 1.64 1.79

* Performance data for Class A is calculated based on the current maximum sales load of 2.25%. From February 11, 2019 until July 14, 2020 the sales load was 0.00%. Prior to February 11, 2019 the sales load was 2.00%.

DWS Short-Term Municipal Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS

DWS Short-Term Municipal Bond Fund

Class A

The following changes are effective on July 15, 2020:

Effective on July 15, 2020 the following information replaces similar existing disclosure contained in the "PAST PERFORMANCE" section of the summary section of the fund's prospectus:

Class Inception 1 Year 5 Years 10 Years
Class A before tax* 2/28/2003 0.96 0.73 1.05
After tax on distributions 0.90 0.72 1.04
After tax on distributions and sale of fund shares 1.13 0.86 1.10
Class T before tax 2/1/2017 0.70 0.68 1.02
Class C before tax 2/28/2003 2.51 0.43 0.52
INST Class before tax 3/6/1995 3.54 1.45 1.53
Class S before tax 2/28/2005 3.34 1.32 1.42
Bloomberg Barclays 1-Year General Obligation Index (reflects no deduction for fees, expenses or taxes) 2.46 1.20 1.06
Bloomberg Barclays 3-Year (2-4) Municipal Bond Index (reflects no deduction for fees, expenses or taxes) 3.67 1.64 1.79

* Performance data for Class A is calculated based on the current maximum sales load of 2.25%. From February 11, 2019 until July 14, 2020 the sales load was 0.00%. Prior to February 11, 2019 the sales load was 2.00%.

Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads * Performance data for Class A is calculated based on the current maximum sales load of 2.25%. From February 11, 2019 until July 14, 2020 the sales load was 0.00%. Prior to February 11, 2019 the sales load was 2.00%.
DWS Short-Term Municipal Bond Fund | before tax | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.96%
5 Years rr_AverageAnnualReturnYear05 0.73%
10 Years rr_AverageAnnualReturnYear10 1.05%
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 28, 2003
DWS Short-Term Municipal Bond Fund | before tax | Class T  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.70%
5 Years rr_AverageAnnualReturnYear05 0.68%
10 Years rr_AverageAnnualReturnYear10 1.02%
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 01, 2017
DWS Short-Term Municipal Bond Fund | before tax | Class C  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.51%
5 Years rr_AverageAnnualReturnYear05 0.43%
10 Years rr_AverageAnnualReturnYear10 0.52%
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 28, 2003
DWS Short-Term Municipal Bond Fund | before tax | INST Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.54%
5 Years rr_AverageAnnualReturnYear05 1.45%
10 Years rr_AverageAnnualReturnYear10 1.53%
Class Inception rr_AverageAnnualReturnInceptionDate Mar. 06, 1995
DWS Short-Term Municipal Bond Fund | before tax | Class S  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.34%
5 Years rr_AverageAnnualReturnYear05 1.32%
10 Years rr_AverageAnnualReturnYear10 1.42%
Class Inception rr_AverageAnnualReturnInceptionDate Feb. 28, 2005
DWS Short-Term Municipal Bond Fund | After tax on distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.90%
5 Years rr_AverageAnnualReturnYear05 0.72%
10 Years rr_AverageAnnualReturnYear10 1.04%
DWS Short-Term Municipal Bond Fund | After tax on distributions and sale of fund shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.13%
5 Years rr_AverageAnnualReturnYear05 0.86%
10 Years rr_AverageAnnualReturnYear10 1.10%
DWS Short-Term Municipal Bond Fund | Bloomberg Barclays 1-Year General Obligation Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.46%
5 Years rr_AverageAnnualReturnYear05 1.20%
10 Years rr_AverageAnnualReturnYear10 1.06%
DWS Short-Term Municipal Bond Fund | Bloomberg Barclays 3-Year (2-4) Municipal Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.67%
5 Years rr_AverageAnnualReturnYear05 1.64%
10 Years rr_AverageAnnualReturnYear10 1.79%