Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DEUTSCHE STATE TAX-FREE INCOME SERIES
Prospectus Date	rr_ProspectusDate	Aug. 01, 2015
Supplement [Text Block]	dstfis_SupplementTextBlock	SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES OF EACH OF THE LISTED FUNDS Deutsche Massachusetts Tax-Free Fund Deutsche Strategic High Yield Tax-Free Fund Deutsche Managed Municipal Bond Fund The following disclosure replaces similar disclosure contained under the "Derivatives" sub-heading of the "PRINCIPAL INVESTMENT STRATEGY" sections of the summary section and "Fund Details" section of each fund's prospectus. Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains. The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund. The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions. The following disclosure replaces "Inverse floating rate securities risk" contained under the "MAIN RISKS" of the summary section of each fund's prospectus. Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.
DEUTSCHE MUNICIPAL TRUST \| Deutsche Managed Municipal Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	dstfis_SupplementTextBlock	SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES OF EACH OF THE LISTED FUNDS Deutsche Massachusetts Tax-Free Fund Deutsche Strategic High Yield Tax-Free Fund Deutsche Managed Municipal Bond Fund The following disclosure replaces similar disclosure contained under the "Derivatives" sub-heading of the "PRINCIPAL INVESTMENT STRATEGY" sections of the summary section and "Fund Details" section of each fund's prospectus. Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains. The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund. The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions. The following disclosure replaces "Inverse floating rate securities risk" contained under the "MAIN RISKS" of the summary section of each fund's prospectus. Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains. The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund. The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.
DEUTSCHE MUNICIPAL TRUST \| Deutsche Strategic High Yield Tax-Free Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	dstfis_SupplementTextBlock	SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES OF EACH OF THE LISTED FUNDS Deutsche Massachusetts Tax-Free Fund Deutsche Strategic High Yield Tax-Free Fund Deutsche Managed Municipal Bond Fund The following disclosure replaces similar disclosure contained under the "Derivatives" sub-heading of the "PRINCIPAL INVESTMENT STRATEGY" sections of the summary section and "Fund Details" section of each fund's prospectus. Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains. The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund. The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions. The following disclosure replaces "Inverse floating rate securities risk" contained under the "MAIN RISKS" of the summary section of each fund's prospectus. Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains. The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund. The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.
DEUTSCHE STATE TAX-FREE INCOME SERIES \| Deutsche Massachusetts Tax-Free Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	dstfis_SupplementTextBlock	SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES OF EACH OF THE LISTED FUNDS Deutsche Massachusetts Tax-Free Fund Deutsche Strategic High Yield Tax-Free Fund Deutsche Managed Municipal Bond Fund The following disclosure replaces similar disclosure contained under the "Derivatives" sub-heading of the "PRINCIPAL INVESTMENT STRATEGY" sections of the summary section and "Fund Details" section of each fund's prospectus. Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains. The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund. The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions. The following disclosure replaces "Inverse floating rate securities risk" contained under the "MAIN RISKS" of the summary section of each fund's prospectus. Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains. The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund. The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.

dei_EntityRegistrantName

DEUTSCHE STATE TAX-FREE INCOME SERIES

dstfis_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES OF EACH OF THE LISTED FUNDS

Deutsche Massachusetts Tax-Free Fund

Deutsche Strategic High Yield Tax-Free Fund

Deutsche Managed Municipal Bond Fund

The following disclosure replaces similar disclosure contained under the "Derivatives" sub-heading of the "PRINCIPAL INVESTMENT STRATEGY" sections of the summary section and "Fund Details" section of each fund's prospectus.

Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains.

The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund.

The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.

The following disclosure replaces "Inverse floating rate securities risk" contained under the "MAIN RISKS" of the summary section of each fund's prospectus.

Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.

Risk/Return:

rr_RiskReturnAbstract

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains.

The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund.

The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.

Supplement [Text Block]

dstfis_SupplementTextBlock

SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES OF EACH OF THE LISTED FUNDS

Deutsche Massachusetts Tax-Free Fund

Deutsche Strategic High Yield Tax-Free Fund

Deutsche Managed Municipal Bond Fund

The following disclosure replaces similar disclosure contained under the "Derivatives" sub-heading of the "PRINCIPAL INVESTMENT STRATEGY" sections of the summary section and "Fund Details" section of each fund's prospectus.

Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains.

The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund.

The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.

The following disclosure replaces "Inverse floating rate securities risk" contained under the "MAIN RISKS" of the summary section of each fund's prospectus.

Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Tender option bonds risk. The fund's participation in tender option bond transactions may reduce the fund's returns or increase volatility. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in TOB Inverse Floater Residual Interests will typically involve more risk than an investment in the underlying municipal bonds. The interest payment on TOB Inverse Floater Residual Interests generally will decrease when short-term interest rates increase. There are also risks associated with the tender option bond structure, which could result in terminating the trust. If a TOB Trust is terminated, the fund must sell other assets to buy back the TOB Floaters, which could negatively impact performance. Events that could cause a termination of the TOB Trust include a deterioration in the financial condition of the liquidity provider, a deterioration in the credit quality of underlying municipal bonds, or a decrease in the value of the underlying bonds due to rising interest rates.

Risk/Return:

rr_RiskReturnAbstract

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Derivatives. Portfolio management generally may use interest rate swaps, which are a type of derivative (a contract whose value is based on, for example, indices, currencies or securities), to manage the duration of the investment portfolio (i.e., reducing or increasing the sensitivity of the fund's portfolio to interest rate changes). Portfolio management may also use tender option bond transactions to seek to enhance potential gains.

The fund may leverage its assets through the use of proceeds received through tender option bond transactions. In a tender option bond transaction, the fund transfers fixed-rate long-term municipal bonds into a special purpose entity (a "TOB Trust"). A TOB Trust typically issues two classes of beneficial interests: short-term floating rate interests ("TOB Floaters"), which are sold to third party investors, and residual inverse floating rate interests ("TOB Inverse Floater Residual Interests"), which are generally held by the fund.

The fund may also use various types of derivatives (i) for hedging; (ii) for risk management; (iii) for non-hedging purposes to seek to enhance potential gains; or (iv) as a substitute for direct investment in a particular asset class or to keep cash on hand to meet shareholder redemptions.