Jan. 31, 2026 |
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| MFS Global High Yield Fund
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Risk Table - MFS Global High Yield Fund
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Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency. The principal risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency.
|
| Investment Selection Risk |
Investment
Selection Risk: MFS' investment analysis and its selection of investments
may not produce the intended results and/or can lead to an investment focus that results in the fund
underperforming other funds with similar investment strategies and/or underperforming the markets in
which the fund invests. In addition, to the extent MFS considers quantitative tools in managing the
fund, such tools may not produce the intended results.
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| Debt Market Risk |
Debt Market
Risk: Debt markets can be volatile and can decline significantly in response to changes
in, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical,
environmental, public health, and other conditions. These conditions can affect a single instrument,
issuer, or borrower, a particular type of instrument, issuer, or borrower, a segment of the debt markets
or the debt markets generally. Certain events can have a dramatic adverse effect on debt markets and
may lead to periods of high volatility and reduced liquidity in a debt market or segment of a debt market.
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| Interest Rate Risk |
Interest Rate Risk: In general,
the price of a debt instrument falls when interest rates rise and rises when interest rates fall. Interest
rate risk is generally greater for instruments with longer maturities or durations, or that do not pay
current interest.
|
| Credit Risk |
Credit Risk: The
price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty,
or other entity responsible for payment, or underlying collateral or assets and the terms of the instrument.
The price of a debt instrument can decline in response to changes in, or perceptions of, the financial
condition of the issuer, borrower, counterparty, or other entity, or underlying collateral or assets,
or changes in, or perceptions of, specific or general market, economic, industry, political, regulatory,
geopolitical, environmental, public health, and other conditions. Debt instruments may be more susceptible to downgrades or defaults during economic
downturns or similar periods of economic stress, which in turn could negatively affect the market value
and liquidity of a debt instrument. Below investment grade quality
debt instruments (commonly referred to as “high yield securities” or “junk bonds”) can involve
a substantially greater risk of default or can already be in default, and their values can decline significantly.
Below investment grade quality debt instruments are regarded as having predominantly speculative characteristics.
Below investment grade quality debt instruments tend to be more sensitive to adverse news about the issuer,
or the market or economy in general, than higher quality debt instruments.
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| Foreign Risk |
Foreign
Risk: Exposure to foreign markets through issuers or currencies can involve additional
risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public
health, and other conditions. These factors can make foreign investments, especially those tied economically
to emerging markets or countries subject to sanctions or the threat of new or modified sanctions, more
volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to
these conditions than the U.S. market.
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| Emerging Markets Risk |
Emerging Markets Risk:
Investments tied economically to emerging markets, especially frontier markets, can involve additional
and greater risks than the risks associated with investments in developed markets. Emerging markets
can have less developed markets, greater custody and operational
risk, less developed legal, regulatory, and accounting systems, greater government involvement in the
economy, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments,
and greater political, social, geopolitical, and economic instability than developed markets.
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| Currency Risk |
Currency
Risk: The value of foreign currencies relative to the U.S. dollar fluctuates in response
to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and
other conditions, and changes in currency exchange rates impact the financial condition of companies
or other issuers and may change the value in U.S. dollars of investments denominated in foreign currencies.
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| Focus Risk |
Focus Risk: Issuers in a single industry,
sector, country, or region can react similarly to market, currency, political, economic, regulatory,
geopolitical, environmental, public health, and other conditions, and the fund's performance will be
affected by the conditions in the industries, sectors, countries, and regions to which the fund is exposed.
Furthermore, investments in particular industries, sectors, countries, or regions may be more volatile
than the broader market as a whole.
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| Prepayment/Extension Risk |
Prepayment/Extension
Risk: Instruments subject to prepayment and/or extension can reduce
the potential for gain for the instrument’s holders if the instrument is prepaid and increase the potential
for loss if the maturity of the instrument is extended.
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| Derivatives Risk |
Derivatives
Risk: Derivatives can be highly volatile and involve risks in addition
to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives
can be substantially greater than the derivatives’ original cost. Derivatives can involve leverage.
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| Leveraging Risk |
Leveraging
Risk: Leverage involves investment exposure in an amount exceeding
the initial investment. Leverage can cause increased volatility by magnifying gains or losses.
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| Counterparty and Third Party Risk |
Counterparty
and Third Party Risk: Transactions involving a
counterparty or third party other than the issuer of the instrument are subject to the credit risk of
the counterparty or third party, and to the counterparty’s or third party’s ability or willingness
to perform in accordance with the terms of the transaction.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
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| Large Shareholder Risk |
Large Shareholder
Risk: From time to time, shareholders of the fund (which may include institutional investors,
financial intermediaries, or other MFS funds) may make relatively large redemptions or purchases of fund
shares. These transactions may cause the fund to sell securities or invest additional cash, as the case
may be, at disadvantageous prices. Redemptions of a large number of shares also may increase transaction
and other costs or have adverse tax consequences for shareholders of the fund by requiring a sale of
portfolio securities. Purchases of a large number of shares may adversely affect the fund's performance
to the extent that it takes time to invest new cash and the fund maintains a larger cash position than
it ordinarily would.
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| MFS High Income Fund
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Risk Table - MFS High Income Fund
|
Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency. The principal risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency.
|
| Investment Selection Risk |
Investment
Selection Risk: MFS' investment analysis and its selection of investments
may not produce the intended results and/or can lead to an investment focus that results in the fund
underperforming other funds with similar investment strategies and/or underperforming the markets in
which the fund invests. In addition, to the extent MFS considers quantitative tools in managing the
fund, such tools may not produce the intended results.
|
| Debt Market Risk |
Debt Market
Risk: Debt markets can be volatile and can decline significantly in response to changes
in, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical,
environmental, public health, and other conditions. These conditions can affect a single instrument,
issuer, or borrower, a particular type of instrument, issuer, or borrower, a segment of the debt markets
or the debt markets generally. Certain events can have a dramatic adverse effect on debt markets and
may lead to periods of high volatility and reduced liquidity in a debt market or segment of a debt market.
|
| Interest Rate Risk |
Interest Rate Risk: In general,
the price of a debt instrument falls when interest rates rise and rises when interest rates fall. Interest
rate risk is generally greater for instruments with longer maturities or durations, or that do not pay
current interest.
|
| Credit Risk |
Credit Risk: The
price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty,
or other entity responsible for payment, or underlying collateral or assets and the terms of the instrument.
The price of a debt instrument can decline in response to changes in, or perceptions of, the financial
condition of the issuer, borrower, counterparty, or other entity, or underlying collateral or assets,
or changes in, or perceptions of, specific or general market, economic, industry, political, regulatory,
geopolitical, environmental, public health, and other conditions. Debt instruments may be more susceptible
to downgrades or defaults during economic downturns or similar periods of economic stress, which in turn
could negatively affect the market value and liquidity of a debt instrument. Below
investment grade quality debt instruments (commonly referred to as “high yield securities” or “junk
bonds”) can involve a substantially greater risk of default or can already be in default, and their
values can decline significantly. Below investment grade quality debt instruments are regarded as having
predominantly speculative characteristics. Below investment grade quality debt instruments tend to be
more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality debt instruments.
|
| Foreign Risk |
Foreign
Risk: Exposure to foreign markets through issuers or currencies can involve additional
risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public
health, and other conditions. These factors can make foreign investments, especially those tied economically
to countries with developing economies or countries subject to sanctions or the threat of new or modified
sanctions, more volatile and less liquid than U.S. investments. In addition, foreign markets can react
differently to these conditions than the U.S. market.
|
| Focus Risk |
Focus Risk:
Issuers in a single industry, sector, country, or region can react similarly to
market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other
conditions, and the fund's performance will be affected by the conditions in the industries, sectors,
countries, and regions to which the fund is exposed. Furthermore, investments in particular industries,
sectors, countries, or regions may be more volatile than the broader market as a whole.
|
| Prepayment/Extension Risk |
Prepayment/Extension
Risk: Instruments subject to prepayment and/or extension can reduce
the potential for gain for the instrument’s holders if the instrument is prepaid and increase the potential
for loss if the maturity of the instrument is extended.
|
| Derivatives Risk |
Derivatives
Risk: Derivatives can be highly volatile and involve risks in addition
to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives
can be substantially greater than the derivatives’ original cost. Derivatives can involve leverage.
|
| Leveraging Risk |
Leveraging
Risk: Leverage involves investment exposure in an amount exceeding
the initial investment. Leverage can cause increased volatility by magnifying gains or losses.
|
| Counterparty and Third Party Risk |
Counterparty
and Third Party Risk: Transactions involving a
counterparty or third party other than the issuer of the instrument are subject to the credit risk of
the counterparty or third party, and to the counterparty’s or third party’s ability or willingness
to perform in accordance with the terms of the transaction.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Large Shareholder Risk |
Large Shareholder
Risk: From time to time, shareholders of the fund (which may include institutional investors,
financial intermediaries, or other MFS funds) may make relatively large redemptions or purchases of fund
shares. These transactions may cause the fund to sell securities or invest additional cash, as the case
may be, at disadvantageous prices. Redemptions of a large number of shares also may increase transaction
and other costs or have adverse tax consequences for shareholders of the fund by requiring a sale of
portfolio securities. Purchases of a large number of shares may adversely affect the fund's performance
to the extent that it takes time to invest new cash and the fund maintains a larger cash position than
it ordinarily would.
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| MFS High Yield Pooled Portfolio
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Risk Table - MFS High Yield Pooled Portfolio
|
Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency. The principal risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency.
|
| Investment Selection Risk |
Investment
Selection Risk: MFS' investment analysis and its selection of investments
may not produce the intended results and/or can lead to an investment focus that results in the fund
underperforming other funds with similar investment strategies and/or underperforming the markets in
which the fund invests. In addition, to the extent MFS considers quantitative tools in managing the
fund, such tools may not produce the intended results.
|
| Debt Market Risk |
Debt Market
Risk: Debt markets can be volatile and can decline significantly in response to changes
in, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical,
environmental, public health, and other conditions. These conditions can affect a single instrument,
issuer, or borrower, a particular type of instrument, issuer, or borrower, a segment of the debt markets
or the debt markets generally. Certain events can have a dramatic adverse effect on debt markets and
may lead to periods of high volatility and reduced liquidity in a debt market or segment of a debt market.
|
| Interest Rate Risk |
Interest Rate Risk: In general,
the price of a debt instrument falls when interest rates rise and rises when interest rates fall. Interest
rate risk is generally greater for instruments with longer maturities or durations, or that do not pay
current interest.
|
| Credit Risk |
Credit Risk: The
price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty,
or other entity responsible for payment, or underlying collateral or assets and the terms of the instrument.
The price of a debt instrument can decline in response to changes in, or perceptions of, the financial
condition of the issuer, borrower, counterparty, or other entity, or underlying collateral or assets,
or changes in, or perceptions of, specific or general market, economic, industry, political, regulatory,
geopolitical, environmental, public health, and other conditions. Debt instruments may be more susceptible
to downgrades or defaults during economic downturns or similar periods of economic stress, which in turn
could negatively affect the market value and liquidity of a debt instrument. Below
investment grade quality debt instruments (commonly referred to as “high yield securities” or “junk
bonds”) can involve a substantially greater risk of default or can already be in default, and their
values can decline significantly. Below investment grade quality debt instruments are regarded as having
predominantly speculative characteristics. Below investment grade quality debt instruments tend to be
more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality
debt instruments.
|
| Foreign Risk |
Foreign Risk: Exposure to foreign markets
through issuers or currencies can involve additional risks relating to market, economic, industry, political,
regulatory, geopolitical, environmental, public health, and other conditions. These factors can make
foreign investments, especially those tied economically to countries with developing economies or countries
subject to sanctions or the threat of new or modified sanctions, more volatile and less liquid than U.S.
investments. In addition, foreign markets can react differently to these conditions than the U.S. market.
|
| Focus Risk |
Focus
Risk: Issuers in a single industry, sector, country, or region can react similarly to
market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other
conditions, and the fund's performance will be affected by the conditions in the industries, sectors,
countries, and regions to which the fund is exposed. Furthermore, investments in particular industries,
sectors, countries, or regions may be more volatile than the broader market as a whole.
|
| Prepayment/Extension Risk |
Prepayment/Extension
Risk: Instruments subject to prepayment and/or extension can reduce
the potential for gain for the instrument’s holders if the instrument is prepaid and increase the potential
for loss if the maturity of the instrument is extended.
|
| Derivatives Risk |
Derivatives
Risk: Derivatives can be highly volatile and involve risks in addition
to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives
can be substantially greater than the derivatives’ original cost. Derivatives can involve leverage.
|
| Leveraging Risk |
Leveraging
Risk: Leverage involves investment exposure in an amount exceeding
the initial investment. Leverage can cause increased volatility by magnifying gains or losses.
|
| Counterparty and Third Party Risk |
Counterparty
and Third Party Risk: Transactions involving a
counterparty or third party other than the issuer of the instrument are subject to the credit risk of
the counterparty or third party, and to the counterparty’s or third party’s ability or willingness
to perform in accordance with the terms of the transaction.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Large Shareholder Risk |
Large Shareholder
Risk: From time to time, shareholders of the fund (which may include institutional investors,
financial intermediaries, or other MFS funds) may make relatively large redemptions or purchases of fund
shares. These transactions may cause the fund to sell securities or invest additional cash, as the case
may be, at disadvantageous prices. Redemptions of a large number of shares also may increase transaction
and other costs or have adverse tax consequences for shareholders of the fund by requiring a sale of
portfolio securities. Purchases of a large number of shares may adversely affect the fund's performance
to the extent that it takes time to invest new cash and the fund maintains a larger cash position than
it ordinarily would.
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|
| MFS Municipal High Income Fund
|
Risk Table - MFS Municipal High Income Fund
|
Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency. The principal risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with any mutual fund, the fund may not achieve its objective
and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit
and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental
agency.
|
| Investment Selection Risk |
Investment
Selection Risk: MFS' investment analysis and its selection of investments
may not produce the intended results and/or can lead to an investment focus that results in the fund
underperforming other funds with similar investment strategies and/or underperforming the markets in
which the fund invests. In addition, to the extent MFS considers quantitative tools in managing the
fund, such tools may not produce the intended results.
|
| Debt Market Risk |
Debt Market
Risk: Debt markets can be volatile and can decline significantly in response to changes
in, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical,
environmental, public health, and other conditions. These conditions can affect a single instrument,
issuer, or borrower, a particular type of instrument, issuer, or borrower, a segment of the debt markets
or the debt markets generally. Certain events can have a dramatic adverse effect on debt markets and
may lead to periods of high volatility and reduced liquidity in a debt market or segment of a debt market.
|
| Interest Rate Risk |
Interest Rate Risk: In general,
the price of a debt instrument falls when interest rates rise and rises when interest rates fall. Interest
rate risk is generally greater for instruments with longer maturities or durations, or that do not pay
current interest.
|
| Credit Risk |
Credit Risk: The
price of a debt instrument depends, in part, on the credit quality of the issuer, borrower, counterparty,
or other entity responsible for payment, or underlying collateral or assets and the terms of the instrument.
The price of a debt instrument can decline in response to changes in, or perceptions of, the financial
condition of the issuer, borrower, counterparty, or other entity, or underlying collateral or assets,
or changes in, or perceptions of, specific or general market, economic, industry, political, regulatory,
geopolitical, environmental, public health, and other conditions. Debt instruments may be more susceptible
to downgrades or defaults during economic downturns or similar periods of economic stress, which in turn
could negatively affect the market value and liquidity of a debt instrument. The
credit quality of, and the ability to pay principal and interest when due by, an issuer of a municipal
instrument depends on the credit quality of the entity supporting the municipal instrument, how essential any services supported by the municipal instrument are, the sufficiency
of any revenues or taxes that support the municipal instrument, and/or the willingness or ability of
the appropriate government entity to approve any appropriations necessary to support the municipal instrument.
In addition, the price of a municipal instrument also depends on its credit quality and ability to meet
the credit support obligations of any insurer or other entity providing credit support to a municipal
instrument. Below investment grade quality debt instruments (commonly
referred to as “high yield securities” or “junk bonds”) can involve a substantially greater risk
of default or can already be in default, and their values can decline significantly. Below investment
grade quality debt instruments are regarded as having predominantly speculative characteristics. Below
investment grade quality debt instruments tend to be more sensitive to adverse news about the issuer,
or the market or economy in general, than higher quality debt instruments.
|
| Municipal Risk |
Municipal
Risk: The price of a municipal instrument can be volatile and significantly affected
by adverse tax changes or court rulings, legislative or political changes, changes in specific or general
market and economic conditions and developments, and the financial condition of municipal issuers and
insurers. Because many municipal instruments are issued to finance similar projects, conditions in certain
industries can significantly affect the fund and the overall municipal market. Municipal instruments
may be more susceptible to downgrades or defaults during economic downturns or similar periods of economic
stress, which in turn could affect the market values and marketability of many or all municipal obligations
of issuers in a state, U.S. territory, or possession. In addition,
because some municipal obligations may be secured or guaranteed by banks and other institutions, the
risk associated with investments in such municipal securities could increase if the banking or financial
sector suffers an economic downturn and/or if the credit ratings of the institutions issuing the guarantee
are downgraded or at risk of being downgraded by a national rating organization. If such events occur,
the value of the security could decrease or the value could be lost entirely, and it may be difficult
or impossible to sell the security at the time and the price that normally prevails in the market.
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| Focus Risk |
Focus
Risk: The fund’s performance will be closely tied to the issuer, market, economic,
industry, political, regulatory, geopolitical, environmental, public health, and other conditions in
the states, territories, and possessions of the United States in which the fund's assets are invested.
If MFS invests a significant percentage of the fund's assets in a single state, territory, or possession,
or a small number of states, territories, or possessions, these conditions will have a significant impact
on the fund's performance and the fund's performance may be more volatile than the performance of more
geographically-diversified funds.
|
| Prepayment/Extension Risk |
Prepayment/Extension Risk:
Instruments subject to prepayment and/or extension can reduce
the potential for gain for the instrument’s holders if the instrument is prepaid and increase the potential
for loss if the maturity of the instrument is extended.
|
| Derivatives Risk |
Derivatives
Risk: Derivatives can be highly volatile and involve risks in addition
to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives
can be substantially greater than the derivatives’ original cost. Derivatives can involve leverage.
|
| Leveraging Risk |
Leveraging
Risk: Leverage involves investment exposure in an amount exceeding
the initial investment. Leverage can cause increased volatility by magnifying gains or losses.
|
| Counterparty and Third Party Risk |
Counterparty
and Third Party Risk: Transactions involving a
counterparty or third party other than the issuer of the instrument are subject to the credit risk of
the counterparty or third party, and to the counterparty’s or third party’s ability or willingness
to perform in accordance with the terms of the transaction.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Large Shareholder Risk |
Large Shareholder
Risk: From time to time, shareholders of the fund (which may include institutional investors,
financial intermediaries, or other MFS funds) may make relatively large redemptions or purchases of fund
shares. These transactions may cause the fund to sell securities or invest additional cash, as the case
may be, at disadvantageous prices. Redemptions of a large number of shares also may increase transaction
and other costs or have adverse tax consequences for shareholders of the fund by requiring a sale of
portfolio securities. Purchases of a large number of shares may adversely affect the fund's performance
to the extent that it takes time to invest new cash and the fund maintains a larger cash position than
it ordinarily would.
|
|