Investment Strategy - Classes A C I and R6 [Member]	May 31, 2026
John Hancock High Yield Municipal Bond Fund
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block]	Under normal market conditions, the fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds.The fund considers municipal bonds to be comprised of securities the income from which is exempt from regular income tax and includes securities that generate income subject to the alternative minimum tax (AMT). The manager normally invests primarily in medium- and lower-quality municipal securities rated A and below by Moody’s Investors Service, Inc. (Moody’s), S&P Global Ratings (S&P), and Fitch Ratings, Inc. (Fitch Ratings), or their unrated equivalents. The fund may buy bonds of any maturity. However, the fund will not invest more than 5% of its total assets in securities rated lower than B. The fund’s investment policies are based on credit ratings at the time of purchase. Bonds that are rated at or below BB by S&P or Fitch or Ba by Moody’s are considered junk bonds. Municipal bonds may be subject to the AMT and income may not be entirely tax-free to all investors. The fund may invest heavily in bonds from any given state or region. The fund may engage in derivative transactions to reduce risk and/or enhance investment returns. Derivatives may include futures contracts on debt securities and debt securities indexes; options on futures, debt securities and debt indexes; and inverse floating-rate securities. The fund may also use tender option bond transactions to seek to enhance potential gains. The fund will look through to the underlying municipal bonds held by a tender option bond trust for purposes of the fund’s 80% policy. The fund may leverage its assets through the use of proceeds received as a result of tender option bond transactions. The fund may contribute up to 15% of its holdings in municipal securities to tender option bond transactions. The manager looks for undervalued bonds, based on both broad and security-specific factors such as issuer creditworthiness, bond structure, and general credit trends, and uses detailed analysis of an appropriate index to model portfolio performance and composition.The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), which tend to offer higher yields than general obligation bonds. The manager also favors bonds that have limitations on early payoff (call protection), which can help minimize the potential effect of falling interest rates on the fund’s yield. The manager may implement short-term trading strategies to take advantage of pricing imbalances within the municipal bond market. For liquidity and flexibility, the fund may invest up to 20% of its net assets (plus any borrowings for investment purposes) in taxable and tax-free investment-grade short-term securities.
Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]	The fund considers municipal bonds to be comprised of securities the income from which is exempt from regular income tax and includes securities that generate income subject to the alternative minimum tax (AMT).
Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]	The manager looks for undervalued bonds, based on both broad and security-specific factors such as issuer creditworthiness, bond structure, and general credit trends, and uses detailed analysis of an appropriate index to model portfolio performance and composition.
Rule 35d-1 Eighty Percent Investment Policy [Text Block]	Under normal market conditions, the fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds.
John Hancock Municipal Opportunities Fund
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block]	Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in tax-exempt bonds of any maturity. The fund primarily invests in bonds that are investment grade when purchased, but the fund may also invest up to 35% of its net assets in non-investment grade bonds rated BB or lower by S&P Global Ratings (S&P), Fitch Ratings, Inc. (Fitch Ratings), or Moody’s Investors Service, Inc. (Moody’s), or comparable rating by any nationally recognized statistical ratings organization (NRSRO) or unrated equivalents. The fund may invest in other fixed income securities which include bonds, debt securities and other similar instruments. The fund’s investment policies are based on credit ratings at the time of purchase. The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds. The manager also favors bonds that have limitations on early payoff (call protection), which can help minimize the effect of falling interest rates on the fund’s yield. The manager may implement short-term trading strategies to take advantage of pricing imbalances within the municipal bond market. To the extent that the fund invests in bonds that are subject to the alternative minimum tax (AMT), the income paid by the fund may not be entirely tax-free to all investors. Investments in bonds subject to the AMT will not be counted toward the fund’s 80% investment policy. The fund may buy bonds of any maturity or duration. The fund may invest heavily in bonds from any given state or region, and may have substantial investments in obligations of certain states and their agencies, instrumentalities, and/or political subdivisions. The fund may engage in derivative transactions that include futures contracts on debt securities and debt securities indexes; options on futures, debt securities, and debt indexes; and inverse floating-rate securities, in each case, for the purposes of reducing risk and/or enhancing investment returns. The fund may also use tender option bond transactions to seek to enhance potential gains. The fund will look through to the underlying municipal bonds held by a tender option bond trust for purposes of the fund’s 80% policy. The fund may leverage its assets through the use of proceeds received as a result of tender option bond transactions. The fund may contribute up to 15% of its holdings in municipal securities to tender option bond transactions.
Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]	The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds. The manager also favors bonds that have limitations on early payoff (call protection), which can help minimize the effect of falling interest rates on the fund’s yield.
Rule 35d-1 Eighty Percent Investment Policy [Text Block]	Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in tax-exempt bonds of any maturity.
John Hancock Short Duration Municipal Opportunities Fund
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block]	Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in municipal bonds that pay interest exempt from federal income tax. Most of these securities are investment-grade, although the fund may invest up to 35% of its net assets in below-investment-grade debt securities (junk bonds) rated as low as CC by S&P Global Ratings (S&P) and Fitch Ratings, Inc. (Fitch Ratings) and Ca by Moody’s Investors Service, Inc. (Moody’s), or comparable rating by any nationally recognized statistical rating organization (NRSRO), or their unrated equivalents. Non-investment grade securities may also be referred to as below investment grade securities, commonly known as “junk bonds”. The fund may invest in fixed income securities which include bonds, debt securities and other similar instruments. The fund’s investment policies are based on credit ratings at the time of purchase. The fund may buy municipal bonds and other fixed income securities of any maturity. The fund will have an average effective duration of 4.5 years or less. Duration is a measure of the sensitivity of a fixed income security’s price to changes in interest rates. The fund may invest heavily in bonds from any given state or region and may have substantial investments in obligations of certain states and their agencies, instrumentalities, and/or political subdivisions. The manager may implement short-term trading strategies to take advantage of pricing imbalances within the municipal bond market. There is no guarantee that the manager will be able to implement these strategies effectively and the strategies may have a more significant impact on the fund's performance before it achieves scale. The fund may engage in derivative transactions that include futures contracts on debt securities and debt securities indexes; options on futures, debt securities, and debt indexes; and inverse floating-rate securities, in each case, for the purposes of reducing risk and/or enhancing investment returns. The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds.
Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]	Duration is a measure of the sensitivity of a fixed income security’s price to changes in interest rates.
Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]	The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds.
Rule 35d-1 Eighty Percent Investment Policy [Text Block]	Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in municipal bonds that pay interest exempt from federal income tax.

Investment Strategy - Classes A C I and R6 [Member]

May 31, 2026

Principal investment strategies

Under normal market conditions, the fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds.The fund considers municipal bonds to be comprised of securities the income from which is exempt from regular income tax and includes securities that generate income subject to the alternative minimum tax (AMT). The manager normally invests primarily in medium- and lower-quality municipal securities rated A and below by Moody’s Investors Service, Inc. (Moody’s), S&P Global Ratings (S&P), and Fitch Ratings, Inc. (Fitch Ratings), or their unrated equivalents. The fund may buy bonds of any maturity. However, the fund will not invest more than 5% of its total assets in securities rated lower than B. The fund’s investment policies are based on credit ratings at the time of purchase. Bonds that are rated at or below BB by S&P or Fitch or Ba by Moody’s are considered junk bonds. Municipal bonds may be subject to the AMT and income may not be entirely tax-free to all investors. The fund may invest heavily in bonds from any given state or region. The fund may engage in derivative transactions to reduce risk and/or enhance investment returns. Derivatives may include futures contracts on debt securities and debt securities indexes; options on futures, debt securities and debt indexes; and inverse floating-rate securities. The fund may also use tender option bond transactions to seek to enhance potential gains. The fund will look through to the underlying municipal bonds held by a tender option bond trust for purposes of the fund’s 80% policy. The fund may leverage its assets through the use of proceeds received as a result of tender option bond transactions. The fund may contribute up to 15% of its holdings in municipal securities to tender option bond transactions. The manager looks for undervalued bonds, based on both broad and security-specific factors such as issuer creditworthiness, bond structure, and general credit trends, and uses detailed analysis of an appropriate index to model portfolio performance and composition.The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), which tend to offer higher yields than general obligation bonds. The manager also favors bonds that have limitations on early payoff (call protection), which can help minimize the potential effect of falling interest rates on the fund’s yield. The manager may implement short-term trading strategies to take advantage of pricing imbalances within the municipal bond market. For liquidity and flexibility, the fund may invest up to 20% of its net assets (plus any borrowings for investment purposes) in taxable and tax-free investment-grade short-term securities.

Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]

The fund considers municipal bonds to be comprised of securities the income from which is exempt from regular income tax and includes securities that generate income subject to the alternative minimum tax (AMT).

Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]

The manager looks for undervalued bonds, based on both broad and security-specific factors such as issuer creditworthiness, bond structure, and general credit trends, and uses detailed analysis of an appropriate index to model portfolio performance and composition.

Rule 35d-1 Eighty Percent Investment Policy [Text Block]

Under normal market conditions, the fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds.

John Hancock Municipal Opportunities Fund

Prospectus [Line Items]

Strategy [Heading]

Principal investment strategies

Strategy Narrative [Text Block]

Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in tax-exempt bonds of any maturity. The fund primarily invests in bonds that are investment grade when purchased, but the fund may also invest up to 35% of its net assets in non-investment grade bonds rated BB or lower by S&P Global Ratings (S&P), Fitch Ratings, Inc. (Fitch Ratings), or Moody’s Investors Service, Inc. (Moody’s), or comparable rating by any nationally recognized statistical ratings organization (NRSRO) or unrated equivalents. The fund may invest in other fixed income securities which include bonds, debt securities and other similar instruments. The fund’s investment policies are based on credit ratings at the time of purchase. The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds. The manager also favors bonds that have limitations on early payoff (call protection), which can help minimize the effect of falling interest rates on the fund’s yield. The manager may implement short-term trading strategies to take advantage of pricing imbalances within the municipal bond market. To the extent that the fund invests in bonds that are subject to the alternative minimum tax (AMT), the income paid by the fund may not be entirely tax-free to all investors. Investments in bonds subject to the AMT will not be counted toward the fund’s 80% investment policy. The fund may buy bonds of any maturity or duration. The fund may invest heavily in bonds from any given state or region, and may have substantial investments in obligations of certain states and their agencies, instrumentalities, and/or political subdivisions. The fund may engage in derivative transactions that include futures contracts on debt securities and debt securities indexes; options on futures, debt securities, and debt indexes; and inverse floating-rate securities, in each case, for the purposes of reducing risk and/or enhancing investment returns. The fund may also use tender option bond transactions to seek to enhance potential gains. The fund will look through to the underlying municipal bonds held by a tender option bond trust for purposes of the fund’s 80% policy. The fund may leverage its assets through the use of proceeds received as a result of tender option bond transactions. The fund may contribute up to 15% of its holdings in municipal securities to tender option bond transactions.

Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]

The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds. The manager also favors bonds that have limitations on early payoff (call protection), which can help minimize the effect of falling interest rates on the fund’s yield.

Rule 35d-1 Eighty Percent Investment Policy [Text Block]

Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in tax-exempt bonds of any maturity.

John Hancock Short Duration Municipal Opportunities Fund

Prospectus [Line Items]

Strategy [Heading]

Principal investment strategies

Strategy Narrative [Text Block]

Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in municipal bonds that pay interest exempt from federal income tax. Most of these securities are investment-grade, although the fund may invest up to 35% of its net assets in below-investment-grade debt securities (junk bonds) rated as low as CC by S&P Global Ratings (S&P) and Fitch Ratings, Inc. (Fitch Ratings) and Ca by Moody’s Investors Service, Inc. (Moody’s), or comparable rating by any nationally recognized statistical rating organization (NRSRO), or their unrated equivalents. Non-investment grade securities may also be referred to as below investment grade securities, commonly known as “junk bonds”. The fund may invest in fixed income securities which include bonds, debt securities and other similar instruments. The fund’s investment policies are based on credit ratings at the time of purchase. The fund may buy municipal bonds and other fixed income securities of any maturity. The fund will have an average effective duration of 4.5 years or less. Duration is a measure of the sensitivity of a fixed income security’s price to changes in interest rates. The fund may invest heavily in bonds from any given state or region and may have substantial investments in obligations of certain states and their agencies, instrumentalities, and/or political subdivisions. The manager may implement short-term trading strategies to take advantage of pricing imbalances within the municipal bond market. There is no guarantee that the manager will be able to implement these strategies effectively and the strategies may have a more significant impact on the fund's performance before it achieves scale. The fund may engage in derivative transactions that include futures contracts on debt securities and debt securities indexes; options on futures, debt securities, and debt indexes; and inverse floating-rate securities, in each case, for the purposes of reducing risk and/or enhancing investment returns. The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds.

Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]

Duration is a measure of the sensitivity of a fixed income security’s price to changes in interest rates.

Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]

Rule 35d-1 Eighty Percent Investment Policy [Text Block]

Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in municipal bonds that pay interest exempt from federal income tax.