| Form N-CSR Cover | 6 Months Ended |
| Nov. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | JOHN HANCOCK MUNICIPAL SECURITIES TRUST |
| Entity Central Index Key | 0000857769 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Nov. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | JOHN HANCOCK MUNICIPAL SECURITIES TRUST |
| Entity Central Index Key | 0000857769 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| C000001874 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock High Yield Municipal Bond Fund |
| Class Name | Class A |
| Trading Symbol | JHTFX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage High Yield Municipal Bond Fund $ 0.82 % |
| Expenses Paid, Amount | $ 43 |
| Expense Ratio, Percent | 0.82% |
| Net Assets | $ 283,374,513 |
| Holdings Count | Holding | 344 |
| Investment Company Portfolio Turnover | 16% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 344 Portfolio turnover rate 16 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 8.3 % Revenue bonds 91.0 % Health care 22.6 % Education 18.2 % Development 16.7 % Other revenue 11.8 % Airport 6.7 % Housing 4.0 % Tobacco 3.9 % Transportation 2.9 % Facilities 1.9 % Pollution 1.1 % Water and sewer 0.6 % Utilities 0.6 % Corporate bonds 0.7 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000001876 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock High Yield Municipal Bond Fund |
| Class Name | Class C |
| Trading Symbol | JCTFX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage High Yield Municipal Bond Fund $ 1.57 % |
| Expenses Paid, Amount | $ 81 |
| Expense Ratio, Percent | 1.57% |
| Net Assets | $ 283,374,513 |
| Holdings Count | Holding | 344 |
| Investment Company Portfolio Turnover | 16% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 344 Portfolio turnover rate 16 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 8.3 % Revenue bonds 91.0 % Health care 22.6 % Education 18.2 % Development 16.7 % Other revenue 11.8 % Airport 6.7 % Housing 4.0 % Tobacco 3.9 % Transportation 2.9 % Facilities 1.9 % Pollution 1.1 % Water and sewer 0.6 % Utilities 0.6 % Corporate bonds 0.7 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000178765 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock High Yield Municipal Bond Fund |
| Class Name | Class I |
| Trading Symbol | JHYMX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage High Yield Municipal Bond Fund $ 0.67 % |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.67% |
| Net Assets | $ 283,374,513 |
| Holdings Count | Holding | 344 |
| Investment Company Portfolio Turnover | 16% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 344 Portfolio turnover rate 16 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 8.3 % Revenue bonds 91.0 % Health care 22.6 % Education 18.2 % Development 16.7 % Other revenue 11.8 % Airport 6.7 % Housing 4.0 % Tobacco 3.9 % Transportation 2.9 % Facilities 1.9 % Pollution 1.1 % Water and sewer 0.6 % Utilities 0.6 % Corporate bonds 0.7 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000193018 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock High Yield Municipal Bond Fund |
| Class Name | Class R6 |
| Trading Symbol | JCTRX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage High Yield Municipal Bond Fund $ 0.63 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.63% |
| Net Assets | $ 283,374,513 |
| Holdings Count | Holding | 344 |
| Investment Company Portfolio Turnover | 16% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 344 Portfolio turnover rate 16 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 8.3 % Revenue bonds 91.0 % Health care 22.6 % Education 18.2 % Development 16.7 % Other revenue 11.8 % Airport 6.7 % Housing 4.0 % Tobacco 3.9 % Transportation 2.9 % Facilities 1.9 % Pollution 1.1 % Water and sewer 0.6 % Utilities 0.6 % Corporate bonds 0.7 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000001877 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Municipal Opportunities Fund |
| Class Name | Class A |
| Trading Symbol | TAMBX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Municipal Opportunities Fund $ 0.71 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.71% |
| Net Assets | $ 1,294,116,366 |
| Holdings Count | Holding | 1,036 |
| Investment Company Portfolio Turnover | 17% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 1,036 Portfolio turnover rate 17 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.2 % Revenue bonds 83.3 % Other revenue 20.2 % Health care 19.0 % Education 9.6 % Airport 8.6 % Development 7.6 % Utilities 5.0 % Water and sewer 4.4 % Transportation 3.9 % Housing 2.3 % Pollution 1.5 % Tobacco 0.8 % Facilities 0.4 % Closed-end funds 0.3 % Short-term investments 0.2 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000001879 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Municipal Opportunities Fund |
| Class Name | Class C |
| Trading Symbol | TBMBX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Municipal Opportunities Fund $ 1.46 % |
| Expenses Paid, Amount | $ 75 |
| Expense Ratio, Percent | 1.46% |
| Net Assets | $ 1,294,116,366 |
| Holdings Count | Holding | 1,036 |
| Investment Company Portfolio Turnover | 17% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 1,036 Portfolio turnover rate 17 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.2 % Revenue bonds 83.3 % Other revenue 20.2 % Health care 19.0 % Education 9.6 % Airport 8.6 % Development 7.6 % Utilities 5.0 % Water and sewer 4.4 % Transportation 3.9 % Housing 2.3 % Pollution 1.5 % Tobacco 0.8 % Facilities 0.4 % Closed-end funds 0.3 % Short-term investments 0.2 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000178766 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Municipal Opportunities Fund |
| Class Name | Class I |
| Trading Symbol | JTBDX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Municipal Opportunities Fund $ 0.56 % |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.56% |
| Net Assets | $ 1,294,116,366 |
| Holdings Count | Holding | 1,036 |
| Investment Company Portfolio Turnover | 17% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 1,036 Portfolio turnover rate 17 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.2 % Revenue bonds 83.3 % Other revenue 20.2 % Health care 19.0 % Education 9.6 % Airport 8.6 % Development 7.6 % Utilities 5.0 % Water and sewer 4.4 % Transportation 3.9 % Housing 2.3 % Pollution 1.5 % Tobacco 0.8 % Facilities 0.4 % Closed-end funds 0.3 % Short-term investments 0.2 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000193019 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Municipal Opportunities Fund |
| Class Name | Class R6 |
| Trading Symbol | JTMRX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Municipal Opportunities Fund $ 0.52 % |
| Expenses Paid, Amount | $ 27 |
| Expense Ratio, Percent | 0.52% |
| Net Assets | $ 1,294,116,366 |
| Holdings Count | Holding | 1,036 |
| Investment Company Portfolio Turnover | 17% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 1,036 Portfolio turnover rate 17 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.2 % Revenue bonds 83.3 % Other revenue 20.2 % Health care 19.0 % Education 9.6 % Airport 8.6 % Development 7.6 % Utilities 5.0 % Water and sewer 4.4 % Transportation 3.9 % Housing 2.3 % Pollution 1.5 % Tobacco 0.8 % Facilities 0.4 % Closed-end funds 0.3 % Short-term investments 0.2 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000236446 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Short Duration Municipal Opportunities Fund |
| Class Name | Class A |
| Trading Symbol | JHSFX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Short Duration Municipal Opportunities Fund $ 0.59 % |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.59% |
| Net Assets | $ 36,911,685 |
| Holdings Count | Holding | 143 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 143 Portfolio turnover rate 31 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.9 % Revenue bonds 83.0 % Other revenue 18.4 % Health care 15.7 % Development 12.6 % Airport 10.7 % Education 9.4 % Utilities 5.1 % Water and sewer 4.1 % Housing 3.0 % Transportation 2.4 % Pollution 1.6 % Short-term investments 0.1 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000236447 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Short Duration Municipal Opportunities Fund |
| Class Name | Class C |
| Trading Symbol | JHSHX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Short Duration Municipal Opportunities Fund $ 1.36 % |
| Expenses Paid, Amount | $ 70 |
| Expense Ratio, Percent | 1.36% |
| Net Assets | $ 36,911,685 |
| Holdings Count | Holding | 143 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 143 Portfolio turnover rate 31 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.9 % Revenue bonds 83.0 % Other revenue 18.4 % Health care 15.7 % Development 12.6 % Airport 10.7 % Education 9.4 % Utilities 5.1 % Water and sewer 4.1 % Housing 3.0 % Transportation 2.4 % Pollution 1.6 % Short-term investments 0.1 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000236448 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Short Duration Municipal Opportunities Fund |
| Class Name | Class I |
| Trading Symbol | JHSJX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Short Duration Municipal Opportunities Fund $ 0.46 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.46% |
| Net Assets | $ 36,911,685 |
| Holdings Count | Holding | 143 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 143 Portfolio turnover rate 31 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.9 % Revenue bonds 83.0 % Other revenue 18.4 % Health care 15.7 % Development 12.6 % Airport 10.7 % Education 9.4 % Utilities 5.1 % Water and sewer 4.1 % Housing 3.0 % Transportation 2.4 % Pollution 1.6 % Short-term investments 0.1 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| C000236445 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | John Hancock Short Duration Municipal Opportunities Fund |
| Class Name | Class R6 |
| Trading Symbol | JHSKX |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the fund at jhinvestments.com/documents |
| Additional Information Phone Number | 800-225-5291 |
| Additional Information Website | jhinvestments.com/documents |
| Expenses [Text Block] | What were the fund costs during the last six months ? (Based on a hypothetical $10,000 investment) Fund (Class) Costs of a $10,000 investment Costs paid as a percentage Short Duration Municipal Opportunities Fund $ 0.42 % |
| Expenses Paid, Amount | $ 22 |
| Expense Ratio, Percent | 0.42% |
| Net Assets | $ 36,911,685 |
| Holdings Count | Holding | 143 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund net assets $ Total number of portfolio holdings 143 Portfolio turnover rate 31 % |
| Holdings [Text Block] | Graphical Representation of Holdings The tables below show the investment makeup of the fund, representing a Portfolio Composition General obligation bonds 16.9 % Revenue bonds 83.0 % Other revenue 18.4 % Health care 15.7 % Development 12.6 % Airport 10.7 % Education 9.4 % Utilities 5.1 % Water and sewer 4.1 % Housing 3.0 % Transportation 2.4 % Pollution 1.6 % Short-term investments 0.1 % Quality Composition Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time. |
| Credit Quality Explanation [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 11-30-24 and do not reflect subsequent downgrades or upgrades, if any. |
| Credit Ratings Selection [Text Block] | Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. |
| Shareholder Report, Holdings (Details) | Nov. 30, 2024 |
| C000001874 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000001874 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000001874 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 40.30% |
| C000001874 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000001874 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000001874 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.90% |
| C000001874 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000001874 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000001874 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000001874 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000001874 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.70% |
| C000001874 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000001874 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000001874 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000001874 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000001874 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000001874 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000001874 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000001874 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000001874 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000001874 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 91% |
| C000001874 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.80% |
| C000001874 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000001876 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000001876 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000001876 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 40.30% |
| C000001876 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000001876 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000001876 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.90% |
| C000001876 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000001876 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000001876 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000001876 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000001876 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.70% |
| C000001876 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000001876 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000001876 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000001876 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000001876 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000001876 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000001876 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000001876 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000001876 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000001876 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 91% |
| C000001876 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.80% |
| C000001876 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000178765 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000178765 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000178765 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 40.30% |
| C000178765 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000178765 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000178765 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.90% |
| C000178765 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000178765 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000178765 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000178765 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000178765 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.70% |
| C000178765 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000178765 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000178765 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000178765 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000178765 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000178765 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000178765 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000178765 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000178765 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000178765 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 91% |
| C000178765 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.80% |
| C000178765 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000193018 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000193018 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000193018 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 40.30% |
| C000193018 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000193018 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000193018 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.90% |
| C000193018 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.40% |
| C000193018 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000193018 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000193018 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.20% |
| C000193018 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.70% |
| C000193018 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.70% |
| C000193018 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000193018 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000193018 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000193018 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000193018 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000193018 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000193018 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000193018 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000193018 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 91% |
| C000193018 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.80% |
| C000193018 [Member] | Corporate Bond Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000001877 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000001877 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000001877 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.20% |
| C000001877 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.10% |
| C000001877 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.90% |
| C000001877 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000001877 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000001877 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000001877 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000001877 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000001877 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000001877 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000001877 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000001877 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000001877 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000001877 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000001877 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000001877 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000001877 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000001877 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.20% |
| C000001877 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83.30% |
| C000001877 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.20% |
| C000001877 [Member] | Closed end funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000001877 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000001877 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000001879 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000001879 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000001879 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.20% |
| C000001879 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.10% |
| C000001879 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.90% |
| C000001879 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000001879 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000001879 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000001879 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000001879 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000001879 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000001879 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000001879 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000001879 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000001879 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000001879 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000001879 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000001879 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000001879 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000001879 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.20% |
| C000001879 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83.30% |
| C000001879 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.20% |
| C000001879 [Member] | Closed end funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000001879 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000001879 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000178766 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000178766 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000178766 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.20% |
| C000178766 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.10% |
| C000178766 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.90% |
| C000178766 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000178766 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000178766 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000178766 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000178766 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000178766 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000178766 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000178766 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000178766 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000178766 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000178766 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000178766 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000178766 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000178766 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000178766 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.20% |
| C000178766 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83.30% |
| C000178766 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.20% |
| C000178766 [Member] | Closed end funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000178766 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000178766 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000193019 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000193019 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000193019 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.20% |
| C000193019 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.10% |
| C000193019 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.90% |
| C000193019 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000193019 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000193019 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000193019 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000193019 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.60% |
| C000193019 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.60% |
| C000193019 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.60% |
| C000193019 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000193019 [Member] | Tobacco [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000193019 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000193019 [Member] | Facilities [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000193019 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000193019 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000193019 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000193019 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.20% |
| C000193019 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83.30% |
| C000193019 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.20% |
| C000193019 [Member] | Closed end funds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000193019 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000193019 [Member] | Equity [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000236446 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000236446 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000236446 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.80% |
| C000236446 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.20% |
| C000236446 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.60% |
| C000236446 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000236446 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000236446 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000236446 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000236446 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000236446 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000236446 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000236446 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.70% |
| C000236446 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000236446 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000236446 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000236446 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000236446 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000236446 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.90% |
| C000236446 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83% |
| C000236446 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.40% |
| C000236446 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000236447 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000236447 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000236447 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.80% |
| C000236447 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.20% |
| C000236447 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.60% |
| C000236447 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000236447 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000236447 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000236447 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000236447 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000236447 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000236447 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000236447 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.70% |
| C000236447 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000236447 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000236447 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000236447 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000236447 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000236447 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.90% |
| C000236447 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83% |
| C000236447 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.40% |
| C000236447 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000236448 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000236448 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000236448 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.80% |
| C000236448 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.20% |
| C000236448 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.60% |
| C000236448 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000236448 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000236448 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000236448 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000236448 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000236448 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000236448 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000236448 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.70% |
| C000236448 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000236448 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000236448 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000236448 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000236448 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000236448 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.90% |
| C000236448 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83% |
| C000236448 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.40% |
| C000236448 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000236445 [Member] | CCC and below [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000236445 [Member] | Moody's, Aaa Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000236445 [Member] | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.80% |
| C000236445 [Member] | Standard & Poor's, AA Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 23.20% |
| C000236445 [Member] | Standard & Poor's, A Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.60% |
| C000236445 [Member] | Standard & Poor's, BBB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.20% |
| C000236445 [Member] | Standard & Poor's, BB Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000236445 [Member] | Standard & Poor's, B Rating [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.50% |
| C000236445 [Member] | Short Term Investments Quality [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000236445 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000236445 [Member] | Education [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.40% |
| C000236445 [Member] | Development [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000236445 [Member] | Airport [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.70% |
| C000236445 [Member] | Housing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000236445 [Member] | Transportation Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000236445 [Member] | Pollution [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000236445 [Member] | Water and sewer [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| C000236445 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000236445 [Member] | General obligation bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.90% |
| C000236445 [Member] | Revenue bonds [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 83% |
| C000236445 [Member] | Other revenue [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.40% |
| C000236445 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
