Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 31, 2017
Registrant Name	dei_EntityRegistrantName	PUTNAM MASSACHUSETTS TAX EXEMPT INCOME FUND/MA/
Central Index Key	dei_EntityCentralIndexKey	0000792288
Amendment Flag	dei_AmendmentFlag	false
Trading Symbol	dei_TradingSymbol	PXMAX
Document Creation Date	dei_DocumentCreationDate	Sep. 26, 2018
Document Effective Date	dei_DocumentEffectiveDate	Sep. 30, 2018
Prospectus Date	rr_ProspectusDate	Sep. 30, 2018
Putnam Massachusetts Tax Exempt Income Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<b>Fund Summaries</b>
Objective [Heading]	rr_ObjectiveHeading	<b>Goal</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Putnam Massachusetts Tax Exempt Income Fund seeks as high a level of current income exempt from federal income tax and Massachusetts personal income tax as we believe is consistent with preservation of capital.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses</b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<b>Shareholder fees </b><i>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses </b><i><br />(expenses you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover</b>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 22%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	22.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in <i>How do I buy fund shares?</i> beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in <i>How to buy shares </i>beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Other expenses are based on expenses of class A shares for the fund's last fiscal year, restated to reflect the lower investor servicing fees applicable to class R6 shares.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example</b>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.
Strategy [Heading]	rr_StrategyHeading	<b>Investments, risks, and performance</b><br /> <br /> <b>Investments</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	We invest mainly in bonds that pay interest that is exempt from federal income tax and Massachusetts personal income tax (but that may be subject to federal alternative minimum tax (AMT)), are investment-grade in quality, and have intermediate- to long-term maturities (i.e., three years or longer). Under normal circumstances, we invest at least 80% of the fund’s net assets in tax-exempt investments. Such tax-exempt investments in which the fund invests are issued by or for states, territories or possessions of the United States or by their political subdivisions, agencies, authorities or other government entities, and the income from these investments is exempt from both federal and Massachusetts personal income tax. This investment policy cannot be changed without the approval of the fund’s shareholders. We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments.
Risk [Heading]	rr_RiskHeading	<b>Risks</b>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	It is important to understand that you can lose money by investing in the fund. The value of bonds in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general financial market conditions, changing market perceptions (including perceptions about the risk of default and expectations about monetary policy or interest rates), changes in government intervention in the financial markets, and factors related to a specific issuer or industry. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings. The risks associated with bond investments include interest rate risk, which means the value of the fund’s investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the fund’s investments may default on payment of interest or principal. Since the fund invests in tax-exempt bonds, which, to be treated as tax-exempt under the Internal Revenue Code, may be issued only by limited types of issuers for limited types of projects, the fund’s investments may be focused in certain market segments. Consequently, the fund may be more vulnerable to fluctuations in the values of the securities it holds than a fund that invests more broadly. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds. The fund’s performance will be closely tied to the economic and political conditions in Massachusetts, and can be more volatile than the performance of a more geographically diversified fund. Interest the fund receives might be taxable. The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<b>Performance</b>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	putnam.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	<b>Annual total returns for class A shares before sales charges</b>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart does not reflect the impact of sales charges. If it did, performance would be lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Year-to-date performance through 6/30/18 −0.73% Best calendar quarter Q3 2009   8.19% Worst calendar quarter Q4 2010 −5.07%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-date performance
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(0.73%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best calendar quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	8.19%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst calendar quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(5.07%)
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns after sales charges </b><i>(for periods ended 12/31/17)</i>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor's tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement. Class B share performance reflects conversion to class A shares after eight years.
Putnam Massachusetts Tax Exempt Income Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.00%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.22%	[2]
Other expenses	rr_OtherExpensesOverAssets	0.14%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.79%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 477
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	642
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	821
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,339
Annual Return 2008	rr_AnnualReturn2008	(5.61%)
Annual Return 2009	rr_AnnualReturn2009	15.91%
Annual Return 2010	rr_AnnualReturn2010	2.40%
Annual Return 2011	rr_AnnualReturn2011	11.11%
Annual Return 2012	rr_AnnualReturn2012	7.42%
Annual Return 2013	rr_AnnualReturn2013	(4.98%)
Annual Return 2014	rr_AnnualReturn2014	9.91%
Annual Return 2015	rr_AnnualReturn2015	2.11%
Annual Return 2016	rr_AnnualReturn2016	0.37%
Annual Return 2017	rr_AnnualReturn2017	4.65%
1 Year	rr_AverageAnnualReturnYear01	0.47%
5 Years	rr_AverageAnnualReturnYear05	1.46%
10 Years	rr_AverageAnnualReturnYear10	3.70%
Putnam Massachusetts Tax Exempt Income Fund | Class B
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.85%
Other expenses	rr_OtherExpensesOverAssets	0.14%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.42%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 645
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	749
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	976
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,530
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	145
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	449
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	776
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,530
1 Year	rr_AverageAnnualReturnYear01	(0.88%)
5 Years	rr_AverageAnnualReturnYear05	1.30%
10 Years	rr_AverageAnnualReturnYear10	3.59%
Putnam Massachusetts Tax Exempt Income Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.14%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.57%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 260
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	496
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	855
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,867
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	160
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	496
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	855
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,867
1 Year	rr_AverageAnnualReturnYear01	2.94%
5 Years	rr_AverageAnnualReturnYear05	1.50%
10 Years	rr_AverageAnnualReturnYear10	3.32%
Putnam Massachusetts Tax Exempt Income Fund | Class M
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.25%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.14%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.07%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 431
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	654
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	896
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,588
1 Year	rr_AverageAnnualReturnYear01	0.97%
5 Years	rr_AverageAnnualReturnYear05	1.34%
10 Years	rr_AverageAnnualReturnYear10	3.49%
Putnam Massachusetts Tax Exempt Income Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.12%	[5]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.55%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 56
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	176
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	307
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 689
1 Year	rr_AverageAnnualReturnYear01	4.98%	[6]
5 Years	rr_AverageAnnualReturnYear05	2.52%	[6]
10 Years	rr_AverageAnnualReturnYear10	4.38%	[6]
Putnam Massachusetts Tax Exempt Income Fund | Class Y
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.14%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.57%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 58
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	183
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	318
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 714
1 Year	rr_AverageAnnualReturnYear01	4.98%
5 Years	rr_AverageAnnualReturnYear05	2.52%
10 Years	rr_AverageAnnualReturnYear10	4.38%
Putnam Massachusetts Tax Exempt Income Fund | after taxes on distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.44%
5 Years	rr_AverageAnnualReturnYear05	1.43%
10 Years	rr_AverageAnnualReturnYear10	3.65%
Putnam Massachusetts Tax Exempt Income Fund | after taxes on distributions and sale of fund shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.51%
5 Years	rr_AverageAnnualReturnYear05	1.80%
10 Years	rr_AverageAnnualReturnYear10	3.65%
Putnam Massachusetts Tax Exempt Income Fund | Bloomberg Barclays Municipal Bond Index (no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.45%
5 Years	rr_AverageAnnualReturnYear05	3.02%
10 Years	rr_AverageAnnualReturnYear10	4.46%
Putnam Minnesota Tax Exempt Income Fund
Risk Return Abstract	rr_RiskReturnAbstract
Objective [Heading]	rr_ObjectiveHeading	<b>Goal</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Putnam Minnesota Tax Exempt Income Fund seeks as high a level of current income exempt from federal income tax and Minnesota personal income tax as we believe is consistent with preservation of capital.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses</b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<b>Shareholder fees </b><i>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses </b><i><br />(expenses you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover</b>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 17%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	17.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in <i>How do I buy fund shares?</i> beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in <i>How to buy shares </i>beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Other expenses are based on expenses of class A shares for the fund's last fiscal year, restated to reflect the lower investor servicing fees applicable to class R6 shares.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example</b>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.
Strategy [Heading]	rr_StrategyHeading	<b>Investments, risks, and performance</b><br /> <br /> <b>Investments</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	We invest mainly in bonds that pay interest that is exempt from federal income tax and Minnesota personal income tax (but that may be subject to federal alternative minimum tax (AMT)), are investment-grade in quality, and have intermediate- to long-term maturities (i.e., three years or longer). Under normal circumstances, we invest at least 80% of the fund’s net assets in tax-exempt investments. Such tax-exempt investments in which the fund invests are issued by or for states, territories or possessions of the United States or by their political subdivisions, agencies, authorities or other government entities, and the income from these investments is exempt from both federal and Minnesota personal income tax. This investment policy cannot be changed without the approval of the fund’s shareholders. We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments.
Risk [Heading]	rr_RiskHeading	<b>Risks</b>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	It is important to understand that you can lose money by investing in the fund. The value of bonds in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general financial market conditions, changing market perceptions (including perceptions about the risk of default and expectations about monetary policy or interest rates), changes in government intervention in the financial markets, and factors related to a specific issuer or industry. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings. The risks associated with bond investments include interest rate risk, which means the value of the fund’s investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the fund’s investments may default on payment of interest or principal. Since the fund invests in tax-exempt bonds, which, to be treated as tax-exempt under the Internal Revenue Code, may be issued only by limited types of issuers for limited types of projects, the fund’s investments may be focused in certain market segments. Consequently, the fund may be more vulnerable to fluctuations in the values of the securities it holds than a fund that invests more broadly. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds. The fund’s performance will be closely tied to the economic and political conditions in Minnesota, and can be more volatile than the performance of a more geographically diversified fund. Interest the fund receives might be taxable. The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<b>Performance</b>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	putnam.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	<b>Annual total returns for class A shares before sales charges</b>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart does not reflect the impact of sales charges. If it did, performance would be lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Year-to-date performance through 6/30/18 −0.40% Best calendar quarter Q3 2009   6.51% Worst calendar quarter Q4 2010 −4.22%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-date performance
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(0.40%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best calendar quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.51%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst calendar quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.22%)
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns after sales charges </b><i>(for periods ended 12/31/17)</i>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor's tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement. Class B share performance reflects conversion to class A shares after eight years.
Putnam Minnesota Tax Exempt Income Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.00%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.23%	[2]
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.87%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 485
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	666
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	863
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,430
Annual Return 2008	rr_AnnualReturn2008	(5.52%)
Annual Return 2009	rr_AnnualReturn2009	15.26%
Annual Return 2010	rr_AnnualReturn2010	2.37%
Annual Return 2011	rr_AnnualReturn2011	10.12%
Annual Return 2012	rr_AnnualReturn2012	6.62%
Annual Return 2013	rr_AnnualReturn2013	(2.79%)
Annual Return 2014	rr_AnnualReturn2014	8.15%
Annual Return 2015	rr_AnnualReturn2015	2.48%
Annual Return 2016	rr_AnnualReturn2016	0.25%
Annual Return 2017	rr_AnnualReturn2017	4.35%
1 Year	rr_AverageAnnualReturnYear01	0.18%
5 Years	rr_AverageAnnualReturnYear05	1.59%
10 Years	rr_AverageAnnualReturnYear10	3.54%
Putnam Minnesota Tax Exempt Income Fund | Class B
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.85%
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.49%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 652
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	771
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,013
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,612
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	152
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	471
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	813
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,612
1 Year	rr_AverageAnnualReturnYear01	(1.29%)
5 Years	rr_AverageAnnualReturnYear05	1.43%
10 Years	rr_AverageAnnualReturnYear10	3.45%
Putnam Minnesota Tax Exempt Income Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.64%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 267
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	517
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	892
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,944
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	167
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	517
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	892
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,944
1 Year	rr_AverageAnnualReturnYear01	2.56%
5 Years	rr_AverageAnnualReturnYear05	1.62%
10 Years	rr_AverageAnnualReturnYear10	3.18%
Putnam Minnesota Tax Exempt Income Fund | Class M
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.25%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.14%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 437
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	675
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	932
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,666
1 Year	rr_AverageAnnualReturnYear01	0.69%
5 Years	rr_AverageAnnualReturnYear05	1.48%
10 Years	rr_AverageAnnualReturnYear10	3.34%
Putnam Minnesota Tax Exempt Income Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.18%	[5]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.61%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 62
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	195
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	340
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 762
1 Year	rr_AverageAnnualReturnYear01	4.69%	[6]
5 Years	rr_AverageAnnualReturnYear05	2.67%	[6]
10 Years	rr_AverageAnnualReturnYear10	4.22%	[6]
Putnam Minnesota Tax Exempt Income Fund | Class Y
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.21%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.64%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 65
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	205
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	357
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 798
1 Year	rr_AverageAnnualReturnYear01	4.69%
5 Years	rr_AverageAnnualReturnYear05	2.67%
10 Years	rr_AverageAnnualReturnYear10	4.22%
Putnam Minnesota Tax Exempt Income Fund | after taxes on distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.09%
5 Years	rr_AverageAnnualReturnYear05	1.54%
10 Years	rr_AverageAnnualReturnYear10	3.51%
Putnam Minnesota Tax Exempt Income Fund | after taxes on distributions and sale of fund shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.32%
5 Years	rr_AverageAnnualReturnYear05	1.87%
10 Years	rr_AverageAnnualReturnYear10	3.49%
Putnam Minnesota Tax Exempt Income Fund | Bloomberg Barclays Municipal Bond Index (no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.45%
5 Years	rr_AverageAnnualReturnYear05	3.02%
10 Years	rr_AverageAnnualReturnYear10	4.46%
Putnam New Jersey Tax Exempt Income Fund
Risk Return Abstract	rr_RiskReturnAbstract
Objective [Heading]	rr_ObjectiveHeading	<b>Goal</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Putnam New Jersey Tax Exempt Income Fund seeks as high a level of current income exempt from federal income tax and New Jersey personal income tax as we believe is consistent with preservation of capital.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses</b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<b>Shareholder fees </b><i>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses </b><i><br />(expenses you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover</b>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 18%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	18.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in <i>How do I buy fund shares?</i> beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in <i>How to buy shares </i>beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Other expenses are based on expenses of class A shares for the fund's last fiscal year, restated to reflect the lower investor servicing fees applicable to class R6 shares.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example</b>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.
Strategy [Heading]	rr_StrategyHeading	<b>Investments, risks, and performance</b><br /> <br /> <b>Investments</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	We invest mainly in bonds that pay interest that is exempt from federal income tax and New Jersey personal income tax (but that may be subject to federal alternative minimum tax (AMT)), are investment-grade in quality, and have intermediate- to long-term maturities (i.e., three years or longer). Under normal circumstances, we invest at least 80% of the fund’s net assets in tax-exempt investments. Such tax-exempt investments in which the fund invests are issued by or for states, territories or possessions of the United States or by their political subdivisions, agencies, authorities or other government entities, and the income from these investments is exempt from both federal and New Jersey personal income tax. This investment policy cannot be changed without the approval of the fund’s shareholders. We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments.
Risk [Heading]	rr_RiskHeading	<b>Risks</b>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	It is important to understand that you can lose money by investing in the fund. The value of bonds in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general financial market conditions, changing market perceptions (including perceptions about the risk of default and expectations about monetary policy or interest rates), changes in government intervention in the financial markets, and factors related to a specific issuer or industry. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings. The risks associated with bond investments include interest rate risk, which means the value of the fund’s investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the fund’s investments may default on payment of interest or principal. Since the fund invests in tax-exempt bonds, which, to be treated as tax-exempt under the Internal Revenue Code, may be issued only by limited types of issuers for limited types of projects, the fund’s investments may be focused in certain market segments. Consequently, the fund may be more vulnerable to fluctuations in the values of the securities it holds than a fund that invests more broadly. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds. The fund’s performance will be closely tied to the economic and political conditions in New Jersey, and can be more volatile than the performance of a more geographically diversified fund. Interest the fund receives might be taxable. The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<b>Performance</b>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	putnam.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	<b>Annual total returns for class A shares before sales charges</b>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart does not reflect the impact of sales charges. If it did, performance would be lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Year-to-date performance through 6/30/18 −0.14% Best calendar quarter Q3 2009   8.26% Worst calendar quarter Q4 2010 −4.47%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-date performance
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(0.14%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best calendar quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	8.26%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst calendar quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.47%)
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns after sales charges </b><i>(for periods ended 12/31/17)</i>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor's tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement. Class B share performance reflects conversion to class A shares after eight years.
Putnam New Jersey Tax Exempt Income Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.00%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.23%	[2]
Other expenses	rr_OtherExpensesOverAssets	0.15%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.81%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 479
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	648
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	832
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,362
Annual Return 2008	rr_AnnualReturn2008	(4.51%)
Annual Return 2009	rr_AnnualReturn2009	14.97%
Annual Return 2010	rr_AnnualReturn2010	1.84%
Annual Return 2011	rr_AnnualReturn2011	9.97%
Annual Return 2012	rr_AnnualReturn2012	7.05%
Annual Return 2013	rr_AnnualReturn2013	(5.15%)
Annual Return 2014	rr_AnnualReturn2014	8.84%
Annual Return 2015	rr_AnnualReturn2015	2.00%
Annual Return 2016	rr_AnnualReturn2016	0.18%
Annual Return 2017	rr_AnnualReturn2017	5.57%
1 Year	rr_AverageAnnualReturnYear01	1.35%
5 Years	rr_AverageAnnualReturnYear05	1.35%
10 Years	rr_AverageAnnualReturnYear10	3.48%
Putnam New Jersey Tax Exempt Income Fund | Class B
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.85%
Other expenses	rr_OtherExpensesOverAssets	0.15%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.43%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 646
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	752
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	982
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,542
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	146
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	452
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	782
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,542
1 Year	rr_AverageAnnualReturnYear01	(0.08%)
5 Years	rr_AverageAnnualReturnYear05	1.21%
10 Years	rr_AverageAnnualReturnYear10	3.37%
Putnam New Jersey Tax Exempt Income Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.15%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.58%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 261
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	499
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	860
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,878
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	161
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	499
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	860
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,878
1 Year	rr_AverageAnnualReturnYear01	3.86%
5 Years	rr_AverageAnnualReturnYear05	1.41%
10 Years	rr_AverageAnnualReturnYear10	3.11%
Putnam New Jersey Tax Exempt Income Fund | Class M
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.25%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.15%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.08%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 432
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	657
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	901
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,599
1 Year	rr_AverageAnnualReturnYear01	1.98%
5 Years	rr_AverageAnnualReturnYear05	1.25%
10 Years	rr_AverageAnnualReturnYear10	3.28%
Putnam New Jersey Tax Exempt Income Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.13%	[5]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.56%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 57
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	179
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	313
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 701
1 Year	rr_AverageAnnualReturnYear01	5.80%	[6]
5 Years	rr_AverageAnnualReturnYear05	2.43%	[6]
10 Years	rr_AverageAnnualReturnYear10	4.15%	[6]
Putnam New Jersey Tax Exempt Income Fund | Class Y
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.15%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.58%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 59
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	186
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	324
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 726
1 Year	rr_AverageAnnualReturnYear01	5.80%
5 Years	rr_AverageAnnualReturnYear05	2.43%
10 Years	rr_AverageAnnualReturnYear10	4.15%
Putnam New Jersey Tax Exempt Income Fund | after taxes on distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.28%
5 Years	rr_AverageAnnualReturnYear05	1.32%
10 Years	rr_AverageAnnualReturnYear10	3.46%
Putnam New Jersey Tax Exempt Income Fund | after taxes on distributions and sale of fund shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.13%
5 Years	rr_AverageAnnualReturnYear05	1.76%
10 Years	rr_AverageAnnualReturnYear10	3.51%
Putnam New Jersey Tax Exempt Income Fund | Bloomberg Barclays Municipal Bond Index (no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.45%
5 Years	rr_AverageAnnualReturnYear05	3.02%
10 Years	rr_AverageAnnualReturnYear10	4.46%
Putnam Ohio Tax Exempt Income Fund
Risk Return Abstract	rr_RiskReturnAbstract
Objective [Heading]	rr_ObjectiveHeading	<b>Goal</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Putnam Ohio Tax Exempt Income Fund seeks as high a level of current income exempt from federal income tax and Ohio personal income tax as we believe is consistent with preservation of capital.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses</b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<b>Shareholder fees </b><i>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses </b><i><br />(expenses you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover</b>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 33%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	33.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in <i>How do I buy fund shares?</i> beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in <i>How to buy shares </i>beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Other expenses are based on expenses of class A shares for the fund's last fiscal year, restated to reflect the lower investor servicing fees applicable to class R6 shares.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example</b>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.
Strategy [Heading]	rr_StrategyHeading	<b>Investments, risks, and performance</b><br /> <br /> <b>Investments</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	We invest mainly in bonds that pay interest that is exempt from federal income tax and Ohio personal income tax (but that may be subject to federal alternative minimum tax (AMT)), are investment-grade in quality, and have intermediate- to long-term maturities (i.e., three years or longer). Under normal circumstances, we invest at least 80% of the fund’s net assets in tax-exempt investments. Such tax-exempt investments in which the fund invests are issued by or for states, territories or possessions of the United States or by their political subdivisions, agencies, authorities or other government entities, and the income from these investments is exempt from both federal and Ohio personal income tax. This investment policy cannot be changed without the approval of the fund’s shareholders. We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments.
Risk [Heading]	rr_RiskHeading	<b>Risks</b>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	It is important to understand that you can lose money by investing in the fund. The value of bonds in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general financial market conditions, changing market perceptions (including perceptions about the risk of default and expectations about monetary policy or interest rates), changes in government intervention in the financial markets, and factors related to a specific issuer or industry. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings. The risks associated with bond investments include interest rate risk, which means the value of the fund’s investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the fund’s investments may default on payment of interest or principal. Since the fund invests in tax-exempt bonds, which, to be treated as tax-exempt under the Internal Revenue Code, may be issued only by limited types of issuers for limited types of projects, the fund’s investments may be focused in certain market segments. Consequently, the fund may be more vulnerable to fluctuations in the values of the securities it holds than a fund that invests more broadly. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds. The fund’s performance will be closely tied to the economic and political conditions in Ohio, and can be more volatile than the performance of a more geographically diversified fund. Interest the fund receives might be taxable. The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<b>Performance</b>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	putnam.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	<b>Annual total returns for class A shares before sales charges</b>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart does not reflect the impact of sales charges. If it did, performance would be lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Year-to-date performance through 6/30/18 −0.44% Best calendar quarter Q3 2009   7.12% Worst calendar quarter Q4 2010 −4.37%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-date performance
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(0.44%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best calendar quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	7.12%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst calendar quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.37%)
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns after sales charges </b><i>(for periods ended 12/31/17)</i>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor's tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement. Class B share performance reflects conversion to class A shares after eight years.
Putnam Ohio Tax Exempt Income Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.00%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.22%	[2]
Other expenses	rr_OtherExpensesOverAssets	0.18%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 481
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	654
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	842
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,384
Annual Return 2008	rr_AnnualReturn2008	(4.06%)
Annual Return 2009	rr_AnnualReturn2009	13.13%
Annual Return 2010	rr_AnnualReturn2010	0.84%
Annual Return 2011	rr_AnnualReturn2011	9.85%
Annual Return 2012	rr_AnnualReturn2012	6.48%
Annual Return 2013	rr_AnnualReturn2013	(3.78%)
Annual Return 2014	rr_AnnualReturn2014	8.23%
Annual Return 2015	rr_AnnualReturn2015	2.47%
Annual Return 2016	rr_AnnualReturn2016	0.22%
Annual Return 2017	rr_AnnualReturn2017	4.31%
1 Year	rr_AverageAnnualReturnYear01	0.14%
5 Years	rr_AverageAnnualReturnYear05	1.38%
10 Years	rr_AverageAnnualReturnYear10	3.21%
Putnam Ohio Tax Exempt Income Fund | Class B
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.85%
Other expenses	rr_OtherExpensesOverAssets	0.18%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.46%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 649
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	762
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	997
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,575
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	149
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	462
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	797
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,575
1 Year	rr_AverageAnnualReturnYear01	(1.45%)
5 Years	rr_AverageAnnualReturnYear05	1.19%
10 Years	rr_AverageAnnualReturnYear10	3.11%
Putnam Ohio Tax Exempt Income Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.18%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.61%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 264
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	508
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	876
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,911
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	164
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	508
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	876
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,911
1 Year	rr_AverageAnnualReturnYear01	2.51%
5 Years	rr_AverageAnnualReturnYear05	1.42%
10 Years	rr_AverageAnnualReturnYear10	2.84%
Putnam Ohio Tax Exempt Income Fund | Class M
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.25%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.18%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.11%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 434
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	666
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	917
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,633
1 Year	rr_AverageAnnualReturnYear01	0.65%
5 Years	rr_AverageAnnualReturnYear05	1.26%
10 Years	rr_AverageAnnualReturnYear10	2.99%
Putnam Ohio Tax Exempt Income Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.16%	[5]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.59%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 60
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	189
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	329
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 738
1 Year	rr_AverageAnnualReturnYear01	4.54%	[6]
5 Years	rr_AverageAnnualReturnYear05	2.46%	[6]
10 Years	rr_AverageAnnualReturnYear10	3.87%	[6]
Putnam Ohio Tax Exempt Income Fund | Class Y
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.18%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.61%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 62
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	195
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	340
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 762
1 Year	rr_AverageAnnualReturnYear01	4.54%
5 Years	rr_AverageAnnualReturnYear05	2.46%
10 Years	rr_AverageAnnualReturnYear10	3.87%
Putnam Ohio Tax Exempt Income Fund | after taxes on distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.14%
5 Years	rr_AverageAnnualReturnYear05	1.38%
10 Years	rr_AverageAnnualReturnYear10	3.20%
Putnam Ohio Tax Exempt Income Fund | after taxes on distributions and sale of fund shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.26%
5 Years	rr_AverageAnnualReturnYear05	1.76%
10 Years	rr_AverageAnnualReturnYear10	3.27%
Putnam Ohio Tax Exempt Income Fund | Bloomberg Barclays Municipal Bond Index (no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.45%
5 Years	rr_AverageAnnualReturnYear05	3.02%
10 Years	rr_AverageAnnualReturnYear10	4.46%
Putnam Pennsylvania Tax Exempt Income Fund
Risk Return Abstract	rr_RiskReturnAbstract
Objective [Heading]	rr_ObjectiveHeading	<b>Goal</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Putnam Pennsylvania Tax Exempt Income Fund seeks as high a level of current income exempt from federal income tax and Pennsylvania personal income tax as we believe is consistent with preservation of capital.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and expenses</b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<b>Shareholder fees </b><i>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual fund operating expenses </b><i><br />(expenses you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio turnover</b>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 24%.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	24.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares or $50,000 in class M shares of Putnam funds. More information about these and other discounts is available from your financial advisor and in <i>How do I buy fund shares?</i> beginning on page 31 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in <i>How to buy shares </i>beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Other expenses are based on expenses of class A shares for the fund's last fiscal year, restated to reflect the lower investor servicing fees applicable to class R6 shares.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example</b>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Your actual costs may be higher or lower.
Strategy [Heading]	rr_StrategyHeading	<b>Investments, risks, and performance</b><br /> <br /> <b>Investments</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	We invest mainly in bonds that pay interest that is exempt from federal income tax and Pennsylvania personal income tax (but that may be subject to federal alternative minimum tax (AMT)), are investment-grade in quality, and have intermediate- to long-term maturities (i.e., three years or longer). Under normal circumstances, we invest at least 80% of the fund’s net assets in tax-exempt investments. Such tax-exempt investments in which the fund invests are issued by or for states, territories or possessions of the United States or by their political subdivisions, agencies, authorities or other government entities, and the income from these investments is exempt from both federal and Pennsylvania personal income tax. This investment policy cannot be changed without the approval of the fund’s shareholders. We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments.
Risk [Heading]	rr_RiskHeading	<b>Risks</b>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	It is important to understand that you can lose money by investing in the fund. The value of bonds in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general financial market conditions, changing market perceptions (including perceptions about the risk of default and expectations about monetary policy or interest rates), changes in government intervention in the financial markets, and factors related to a specific issuer or industry. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings. The risks associated with bond investments include interest rate risk, which means the value of the fund’s investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the fund’s investments may default on payment of interest or principal. Since the fund invests in tax-exempt bonds, which, to be treated as tax-exempt under the Internal Revenue Code, may be issued only by limited types of issuers for limited types of projects, the fund’s investments may be focused in certain market segments. Consequently, the fund may be more vulnerable to fluctuations in the values of the securities it holds than a fund that invests more broadly. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds. The fund’s performance will be closely tied to the economic and political conditions in Pennsylvania, and can be more volatile than the performance of a more geographically diversified fund. Interest the fund receives might be taxable. The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<b>Performance</b>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	putnam.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	<b>Annual total returns for class A shares before sales charges</b>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart does not reflect the impact of sales charges. If it did, performance would be lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Year-to-date performance through 6/30/18 −0.42% Best calendar quarter Q3 2009   6.87% Worst calendar quarter Q4 2010 −4.41%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-date performance
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(0.42%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best calendar quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.87%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst calendar quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.41%)
Performance Table Heading	rr_PerformanceTableHeading	<b>Average annual total returns after sales charges </b><i>(for periods ended 12/31/17)</i>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor's tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement. Class B share performance reflects conversion to class A shares after eight years.
Putnam Pennsylvania Tax Exempt Income Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.00%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.23%	[2]
Other expenses	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.82%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 480
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	651
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	837
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,373
Annual Return 2008	rr_AnnualReturn2008	(5.86%)
Annual Return 2009	rr_AnnualReturn2009	14.87%
Annual Return 2010	rr_AnnualReturn2010	1.66%
Annual Return 2011	rr_AnnualReturn2011	9.55%
Annual Return 2012	rr_AnnualReturn2012	7.24%
Annual Return 2013	rr_AnnualReturn2013	(4.56%)
Annual Return 2014	rr_AnnualReturn2014	9.40%
Annual Return 2015	rr_AnnualReturn2015	2.60%
Annual Return 2016	rr_AnnualReturn2016	0.36%
Annual Return 2017	rr_AnnualReturn2017	4.76%
1 Year	rr_AverageAnnualReturnYear01	0.57%
5 Years	rr_AverageAnnualReturnYear05	1.58%
10 Years	rr_AverageAnnualReturnYear10	3.40%
Putnam Pennsylvania Tax Exempt Income Fund | Class B
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.85%
Other expenses	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.44%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 647
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	756
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	987
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,556
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	147
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	456
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	787
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,556
1 Year	rr_AverageAnnualReturnYear01	(0.87%)
5 Years	rr_AverageAnnualReturnYear05	1.40%
10 Years	rr_AverageAnnualReturnYear10	3.28%
Putnam Pennsylvania Tax Exempt Income Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.59%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 262
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	502
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	866
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,889
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	162
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	502
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	866
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,889
1 Year	rr_AverageAnnualReturnYear01	2.96%
5 Years	rr_AverageAnnualReturnYear05	1.60%
10 Years	rr_AverageAnnualReturnYear10	3.02%
Putnam Pennsylvania Tax Exempt Income Fund | Class M
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.25%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.09%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 433
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	660
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	906
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,611
1 Year	rr_AverageAnnualReturnYear01	1.08%
5 Years	rr_AverageAnnualReturnYear05	1.46%
10 Years	rr_AverageAnnualReturnYear10	3.19%
Putnam Pennsylvania Tax Exempt Income Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.14%	[5]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.57%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 58
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	183
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	318
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 714
1 Year	rr_AverageAnnualReturnYear01	5.00%	[6]
5 Years	rr_AverageAnnualReturnYear05	2.64%	[6]
10 Years	rr_AverageAnnualReturnYear10	4.07%	[6]
Putnam Pennsylvania Tax Exempt Income Fund | Class Y
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.43%
Other expenses	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.59%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 60
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	189
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	329
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 738
1 Year	rr_AverageAnnualReturnYear01	5.00%
5 Years	rr_AverageAnnualReturnYear05	2.64%
10 Years	rr_AverageAnnualReturnYear10	4.07%
Putnam Pennsylvania Tax Exempt Income Fund | after taxes on distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.54%
5 Years	rr_AverageAnnualReturnYear05	1.57%
10 Years	rr_AverageAnnualReturnYear10	3.39%
Putnam Pennsylvania Tax Exempt Income Fund | after taxes on distributions and sale of fund shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.56%
5 Years	rr_AverageAnnualReturnYear05	1.93%
10 Years	rr_AverageAnnualReturnYear10	3.43%
Putnam Pennsylvania Tax Exempt Income Fund | Bloomberg Barclays Municipal Bond Index (no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.45%
5 Years	rr_AverageAnnualReturnYear05	3.02%
10 Years	rr_AverageAnnualReturnYear10	4.46%

[1] Applies only to certain redemptions of shares bought with no initial sales charge.

[2] Represents a blended rate.

[3] This charge is phased out over six years.

[4] This charge is eliminated after one year.

[5] Other expenses are based on expenses of class A shares for the fund's last fiscal year, restated to reflect the lower investor servicing fees applicable to class R6 shares.

[6] Performance for class R6 shares prior to its inception (5/22/18) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares; had it, returns would have been higher.