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Shareholder Report
 12 Months Ended 45 Months Ended
Aug. 31, 2024
USD ($)
Holding
Aug. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]    
Document Type N-CSR  
Amendment Flag false  
Registrant Name DEUTSCHE DWS STATE TAX-FREE INCOME SERIES  
Entity Central Index Key 0000714287  
Entity Investment Company Type N-1A  
Document Period End Date Aug. 31, 2024  
C000016814    
Shareholder Report [Line Items]    
Fund Name DWS California Tax-Free Income Fund  
Class Name Class A  
Trading Symbol KCTAX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about DWS California Tax-Free Income Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.  
Additional Information Phone Number (800) 728-3337  
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>  
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$82
0.79%

Gross expense ratio as of the latest prospectus: 0.86%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

 
Expenses Paid, Amount $ 82  
Expense Ratio, Percent 0.79%  
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.  
Average Annual Return [Table Text Block]
Class/Index
1-Year
5-Year
10-Year
Class A Unadjusted for Sales Charge
7.27%
0.38%
1.86%
Class A Adjusted for the Maximum Sales Charge (max 2.75% load)
4.32%
-0.18%
1.58%
Bloomberg Municipal Bond Index
6.09%
1.02%
2.43%
Bloomberg California Exempt Municipal Bond Index
5.63%
0.96%
2.39%
 
No Deduction of Taxes [Text Block] The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.  
AssetsNet $ 340,805,084 $ 340,805,084
Holdings Count | Holding 182 182
Advisory Fees Paid, Amount $ 1,319,174  
InvestmentCompanyPortfolioTurnover 49.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets ($)
340,805,084
Number of Portfolio Holdings
182
Portfolio Turnover Rate (%)
49
Total Net Advisory Fees Paid ($)
1,319,174
Modified Duration to Worst
7.2 years

Modified duration to worst is the measure of sensitivity of the prices of bonds held by the Fund to a change in interest rates, computed using each bond's nearest call or maturity date.

  
Holdings [Text Block]

Asset Allocation

Asset Type
% of Net Assets
Revenue Bonds
78%
General Obligation Bonds
12%
Lease Obligations
7%
Variable Rate Demand Notes
2%
Excrow To Maturity/prefunded Bonds
1%
Other
1%
Variable Rate Demand Preferred Shares
0%
Other Assets and Liabilities, Net
(1%)
Total
100%
 
Material Fund Change [Text Block]
 
C000016816    
Shareholder Report [Line Items]    
Fund Name DWS California Tax-Free Income Fund  
Class Name Class C  
Trading Symbol KCTCX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about DWS California Tax-Free Income Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.  
Additional Information Phone Number (800) 728-3337  
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>  
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$159
1.54%

Gross expense ratio as of the latest prospectus: 1.62%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

 
Expenses Paid, Amount $ 159  
Expense Ratio, Percent 1.54%  
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.  
Average Annual Return [Table Text Block]
Class/Index
1-Year
5-Year
10-Year
Class C Unadjusted for Sales Charge
6.50%
-0.36%
1.11%
Class C Adjusted for the Maximum Sales Charge (max 1.00% CDSC)
5.50%
-0.36%
1.11%
Bloomberg Municipal Bond Index
6.09%
1.02%
2.43%
Bloomberg California Exempt Municipal Bond Index
5.63%
0.96%
2.39%
 
No Deduction of Taxes [Text Block] The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.  
AssetsNet $ 340,805,084 $ 340,805,084
Holdings Count | Holding 182 182
Advisory Fees Paid, Amount $ 1,319,174  
InvestmentCompanyPortfolioTurnover 49.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets ($)
340,805,084
Number of Portfolio Holdings
182
Portfolio Turnover Rate (%)
49
Total Net Advisory Fees Paid ($)
1,319,174
Modified Duration to Worst
7.2 years

Modified duration to worst is the measure of sensitivity of the prices of bonds held by the Fund to a change in interest rates, computed using each bond's nearest call or maturity date.

  
Holdings [Text Block]

Asset Allocation

Asset Type
% of Net Assets
Revenue Bonds
78%
General Obligation Bonds
12%
Lease Obligations
7%
Variable Rate Demand Notes
2%
Excrow To Maturity/prefunded Bonds
1%
Other
1%
Variable Rate Demand Preferred Shares
0%
Other Assets and Liabilities, Net
(1%)
Total
100%
 
Material Fund Change [Text Block]
 
C000016817    
Shareholder Report [Line Items]    
Fund Name DWS California Tax-Free Income Fund  
Class Name Class S  
Trading Symbol SDCSX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about DWS California Tax-Free Income Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.  
Additional Information Phone Number (800) 728-3337  
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>  
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class S
$56
0.54%

Gross expense ratio as of the latest prospectus: 0.66%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

 
Expenses Paid, Amount $ 56  
Expense Ratio, Percent 0.54%  
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.  
Average Annual Return [Table Text Block]
Class/Index
1-Year
5-Year
10-Year
Class S No Sales Charge
7.55%
0.65%
2.12%
Bloomberg Municipal Bond Index
6.09%
1.02%
2.43%
Bloomberg California Exempt Municipal Bond Index
5.63%
0.96%
2.39%
 
No Deduction of Taxes [Text Block] The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.  
AssetsNet $ 340,805,084 $ 340,805,084
Holdings Count | Holding 182 182
Advisory Fees Paid, Amount $ 1,319,174  
InvestmentCompanyPortfolioTurnover 49.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets ($)
340,805,084
Number of Portfolio Holdings
182
Portfolio Turnover Rate (%)
49
Total Net Advisory Fees Paid ($)
1,319,174
Modified Duration to Worst
7.2 years

Modified duration to worst is the measure of sensitivity of the prices of bonds held by the Fund to a change in interest rates, computed using each bond's nearest call or maturity date.

  
Holdings [Text Block]

Asset Allocation

Asset Type
% of Net Assets
Revenue Bonds
78%
General Obligation Bonds
12%
Lease Obligations
7%
Variable Rate Demand Notes
2%
Excrow To Maturity/prefunded Bonds
1%
Other
1%
Variable Rate Demand Preferred Shares
0%
Other Assets and Liabilities, Net
(1%)
Total
100%
 
Material Fund Change [Text Block]
 
C000223770    
Shareholder Report [Line Items]    
Fund Name DWS California Tax-Free Income Fund  
Class Name Institutional Class  
Trading Symbol DCLIX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about DWS California Tax-Free Income Fund ("the Fund") for the period September 1, 2023 to August 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund on the Fund's website at dws.com/mutualreports. You can also request this information by contacting us at (800) 728-3337.  
Additional Information Phone Number (800) 728-3337  
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 14.6667px; font-weight: 300; grid-area: auto; line-height: 17.6px; margin: 0px; overflow: visible; text-align: left;">dws.com/mutualreports</span>  
Expenses [Text Block]

What were the Fund costs for the last year?

(Based on a hypothetical $10,000 investment)
Cost of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$56
0.54%

Gross expense ratio as of the latest prospectus: 0.64%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

 
Expenses Paid, Amount $ 56  
Expense Ratio, Percent 0.54%  
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor or guarantee of the Fund's future performance.  
Average Annual Return [Table Text Block]
Class/Index
1-Year
Since Inception 12/1/20
Institutional Class No Sales Charge
7.55%
0.13%
Bloomberg Municipal Bond Index
6.09%
0.19%
Bloomberg California Exempt Municipal Bond Index
5.63%
0.06%
 
Performance Inception Date   Dec. 01, 2020
No Deduction of Taxes [Text Block] The performance graph and returns table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares.  
AssetsNet $ 340,805,084 $ 340,805,084
Holdings Count | Holding 182 182
Advisory Fees Paid, Amount $ 1,319,174  
InvestmentCompanyPortfolioTurnover 49.00%  
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets ($)
340,805,084
Number of Portfolio Holdings
182
Portfolio Turnover Rate (%)
49
Total Net Advisory Fees Paid ($)
1,319,174
Modified Duration to Worst
7.2 years

Modified duration to worst is the measure of sensitivity of the prices of bonds held by the Fund to a change in interest rates, computed using each bond's nearest call or maturity date.

  
Holdings [Text Block]

Asset Allocation

Asset Type
% of Net Assets
Revenue Bonds
78%
General Obligation Bonds
12%
Lease Obligations
7%
Variable Rate Demand Notes
2%
Excrow To Maturity/prefunded Bonds
1%
Other
1%
Variable Rate Demand Preferred Shares
0%
Other Assets and Liabilities, Net
(1%)
Total
100%
 
Material Fund Change [Text Block]