v3.26.1
Shareholder Report
6 Months Ended
Feb. 28, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
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 Feb. 28, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000016818  
Shareholder Report [Line Items]  
Fund Name DWS New York Tax-Free Income Fund
Class Name Class A
Trading Symbol KNTAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about DWS New York Tax-Free Income Fund (the "Fund") for the period September 1, 2025 to February 28, 2026.
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; text-align-last: auto; white-space-collapse: preserve-breaks;">dws.com/mutualreports</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Fund
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$44
0.85%Footnote Reference(a)
FootnoteDescription
Footnote(a)
Annualized.

Gross expense ratio as of the latest prospectus: 1.05%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.85% [1]
AssetsNet $ 164,641,602
Holdings Count | Holding 142
Advisory Fees Paid, Amount $ 250,480
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets ($)
164,641,602
Number of Portfolio Holdings
142
Portfolio Turnover Rate (%)
19
Total Net Advisory Fees Paid ($)
250,480
Modified Duration to Worst
7.9 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

Table Summary
Asset Type
% of Net Assets
Revenue Bonds
82%
Lease Obligations
12%
General Obligation Bonds
6%
Other
2%
Variable Rate Demand Notes
1%
Other Assets and Liabilities, Net
(3%)
Total
100%

Credit Quality

Table Summary
Credit Rating
% of Net Assets
AAA
13%
AA
42%
A
17%
BBB
13%
BB
4%
B
0%
Not Rated
9%
Credit Ratings Selection [Text Block] The quality ratings represent the highest of Moody’s Investors Service, Inc. (“Moody’s”), Fitch Ratings, Inc. (“Fitch”) or S&P Global Ratings (“S&P”) credit ratings. The ratings of Moody’s, Fitch and S&P represent their opinions as to the quality of the securities they rate. Credit quality measures a bond issuer’s ability to repay interest and principal in a timely manner. Ratings are relative and subjective and are not absolute standards of quality. Credit quality does not remove market risk and is subject to change.
C000016820  
Shareholder Report [Line Items]  
Fund Name DWS New York Tax-Free Income Fund
Class Name Class C
Trading Symbol KNTCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about DWS New York Tax-Free Income Fund (the "Fund") for the period September 1, 2025 to February 28, 2026.
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; text-align-last: auto; white-space-collapse: preserve-breaks;">dws.com/mutualreports</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Fund
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$82
1.60%Footnote Reference(a)
FootnoteDescription
Footnote(a)
Annualized.

Gross expense ratio as of the latest prospectus: 1.86%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

Expenses Paid, Amount $ 82
Expense Ratio, Percent 1.60% [2]
AssetsNet $ 164,641,602
Holdings Count | Holding 142
Advisory Fees Paid, Amount $ 250,480
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets ($)
164,641,602
Number of Portfolio Holdings
142
Portfolio Turnover Rate (%)
19
Total Net Advisory Fees Paid ($)
250,480
Modified Duration to Worst
7.9 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

Table Summary
Asset Type
% of Net Assets
Revenue Bonds
82%
Lease Obligations
12%
General Obligation Bonds
6%
Other
2%
Variable Rate Demand Notes
1%
Other Assets and Liabilities, Net
(3%)
Total
100%

Credit Quality

Table Summary
Credit Rating
% of Net Assets
AAA
13%
AA
42%
A
17%
BBB
13%
BB
4%
B
0%
Not Rated
9%
Credit Ratings Selection [Text Block] The quality ratings represent the highest of Moody’s Investors Service, Inc. (“Moody’s”), Fitch Ratings, Inc. (“Fitch”) or S&P Global Ratings (“S&P”) credit ratings. The ratings of Moody’s, Fitch and S&P represent their opinions as to the quality of the securities they rate. Credit quality measures a bond issuer’s ability to repay interest and principal in a timely manner. Ratings are relative and subjective and are not absolute standards of quality. Credit quality does not remove market risk and is subject to change.
C000223771  
Shareholder Report [Line Items]  
Fund Name DWS New York Tax-Free Income Fund
Class Name Institutional Class
Trading Symbol DNTIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about DWS New York Tax-Free Income Fund (the "Fund") for the period September 1, 2025 to February 28, 2026.
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; text-align-last: auto; white-space-collapse: preserve-breaks;">dws.com/mutualreports</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Fund
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$31
0.60%Footnote Reference(a)
FootnoteDescription
Footnote(a)
Annualized.

Gross expense ratio as of the latest prospectus: 0.84%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.60% [3]
AssetsNet $ 164,641,602
Holdings Count | Holding 142
Advisory Fees Paid, Amount $ 250,480
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets ($)
164,641,602
Number of Portfolio Holdings
142
Portfolio Turnover Rate (%)
19
Total Net Advisory Fees Paid ($)
250,480
Modified Duration to Worst
7.9 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

Table Summary
Asset Type
% of Net Assets
Revenue Bonds
82%
Lease Obligations
12%
General Obligation Bonds
6%
Other
2%
Variable Rate Demand Notes
1%
Other Assets and Liabilities, Net
(3%)
Total
100%

Credit Quality

Table Summary
Credit Rating
% of Net Assets
AAA
13%
AA
42%
A
17%
BBB
13%
BB
4%
B
0%
Not Rated
9%
Credit Ratings Selection [Text Block] The quality ratings represent the highest of Moody’s Investors Service, Inc. (“Moody’s”), Fitch Ratings, Inc. (“Fitch”) or S&P Global Ratings (“S&P”) credit ratings. The ratings of Moody’s, Fitch and S&P represent their opinions as to the quality of the securities they rate. Credit quality measures a bond issuer’s ability to repay interest and principal in a timely manner. Ratings are relative and subjective and are not absolute standards of quality. Credit quality does not remove market risk and is subject to change.
C000016821  
Shareholder Report [Line Items]  
Fund Name DWS New York Tax-Free Income Fund
Class Name Class S
Trading Symbol SNWYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about DWS New York Tax-Free Income Fund (the "Fund") for the period September 1, 2025 to February 28, 2026.
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; text-align-last: auto; white-space-collapse: preserve-breaks;">dws.com/mutualreports</span>
Expenses [Text Block]

What were the Fund costs for the last six months?

(Based on a hypothetical $10,000 investment)

Table Summary
Fund
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class S
$31
0.60%Footnote Reference(a)
FootnoteDescription
Footnote(a)
Annualized.

Gross expense ratio as of the latest prospectus: 0.83%. See prospectus for any contractual or voluntary waivers; without a waiver, costs would have been higher.

Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.60% [4]
AssetsNet $ 164,641,602
Holdings Count | Holding 142
Advisory Fees Paid, Amount $ 250,480
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Net Assets ($)
164,641,602
Number of Portfolio Holdings
142
Portfolio Turnover Rate (%)
19
Total Net Advisory Fees Paid ($)
250,480
Modified Duration to Worst
7.9 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

Table Summary
Asset Type
% of Net Assets
Revenue Bonds
82%
Lease Obligations
12%
General Obligation Bonds
6%
Other
2%
Variable Rate Demand Notes
1%
Other Assets and Liabilities, Net
(3%)
Total
100%

Credit Quality

Table Summary
Credit Rating
% of Net Assets
AAA
13%
AA
42%
A
17%
BBB
13%
BB
4%
B
0%
Not Rated
9%
Credit Ratings Selection [Text Block] The quality ratings represent the highest of Moody’s Investors Service, Inc. (“Moody’s”), Fitch Ratings, Inc. (“Fitch”) or S&P Global Ratings (“S&P”) credit ratings. The ratings of Moody’s, Fitch and S&P represent their opinions as to the quality of the securities they rate. Credit quality measures a bond issuer’s ability to repay interest and principal in a timely manner. Ratings are relative and subjective and are not absolute standards of quality. Credit quality does not remove market risk and is subject to change.
[1] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.