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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 contains important information about the John Hancock High Yield Municipal Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
High Yield Municipal Bond Fund
(Class A/JHTFX)		 $43 0.82%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.82%
Net Assets $ 283,374,513
Holdings Count | Holding 344
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $283,374,513
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock High Yield Municipal Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
High Yield Municipal Bond Fund
(Class C/JCTFX)		 $81 1.57%
Expenses Paid, Amount $ 81
Expense Ratio, Percent 1.57%
Net Assets $ 283,374,513
Holdings Count | Holding 344
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $283,374,513
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock High Yield Municipal Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
High Yield Municipal Bond Fund
(Class I/JHYMX)		 $35 0.67%
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.67%
Net Assets $ 283,374,513
Holdings Count | Holding 344
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $283,374,513
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock High Yield Municipal Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
High Yield Municipal Bond Fund
(Class R6/JCTRX)		 $33 0.63%
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.63%
Net Assets $ 283,374,513
Holdings Count | Holding 344
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $283,374,513
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Municipal Opportunities Fund
(Class A/TAMBX)		 $36 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 17.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,294,116,366
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Municipal Opportunities Fund
(Class C/TBMBX)		 $75 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 17.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,294,116,366
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Municipal Opportunities Fund
(Class I/JTBDX)		 $29 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 17.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,294,116,366
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Municipal Opportunities Fund
(Class R6/JTMRX)		 $27 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 17.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,294,116,366
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Short Duration Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Short Duration Municipal Opportunities Fund
(Class A/JHSFX)		 $30 0.59%
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.59%
Net Assets $ 36,911,685
Holdings Count | Holding 143
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $36,911,685
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Short Duration Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Short Duration Municipal Opportunities Fund
(Class C/JHSHX)		 $70 1.36%
Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.36%
Net Assets $ 36,911,685
Holdings Count | Holding 143
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $36,911,685
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Short Duration Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Short Duration Municipal Opportunities Fund
(Class I/JHSJX)		 $24 0.46%
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.46%
Net Assets $ 36,911,685
Holdings Count | Holding 143
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $36,911,685
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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 contains important information about the John Hancock Short Duration Municipal Opportunities Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
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. You can also request this information by contacting us at 800-225-5291.
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
of a $10,000 investment
Short Duration Municipal Opportunities Fund
(Class R6/JHSKX)		 $22 0.42%
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.42%
Net Assets $ 36,911,685
Holdings Count | Holding 143
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $36,911,685
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 percentage of the total investments of the fund.
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
Graphical Representation - Allocation 1 Chart
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.