Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

DEUTSCHE STATE TAX-FREE INCOME SERIES

Prospectus Date

rr_ProspectusDate

Aug. 01, 2014

Supplement [Text Block]

dstfis_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION

Deutsche Massachusetts Tax-Free Fund

The following is in effect until August 11, 2014:

The name of the Fund is DWS Massachusetts Tax-Free Fund and the name of the Trust is DWS State Tax-Free Income Series.

DeAWM Distributors, Inc. (“DDI”) is known as DWS Investments Distributors, Inc. (“DIDI”).

DeAWM Service Company (“DSC”) is known as DWS Investments Service Company (“DISC”).

All references to “Deutsche Asset & Wealth Management” are replaced by “DWS Investments”.

All references to “Deutsche funds” are replaced by “DWS funds”.

All Web site references that include “deutschefunds.com” are replaced by “dws-investments.com”.

DWS Massachusetts Tax-Free Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

dstfis_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION

Deutsche Massachusetts Tax-Free Fund

The following is in effect until August 11, 2014:

The name of the Fund is DWS Massachusetts Tax-Free Fund and the name of the Trust is DWS State Tax-Free Income Series.

DeAWM Distributors, Inc. (“DDI”) is known as DWS Investments Distributors, Inc. (“DIDI”).

DeAWM Service Company (“DSC”) is known as DWS Investments Service Company (“DISC”).

All references to “Deutsche Asset & Wealth Management” are replaced by “DWS Investments”.

All references to “Deutsche funds” are replaced by “DWS funds”.

All Web site references that include “deutschefunds.com” are replaced by “dws-investments.com”.