XML 44 R2.htm IDEA: XBRL DOCUMENT v3.24.4
Shareholder Report
 12 Months Ended
Oct. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Columbia Funds Series Trust I
Entity Central Index Key 0000773757
Entity Investment Company Type N-1A
Document Period End Date Oct. 31, 2024
Columbia Intermediate Duration Municipal Bond Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Intermediate Duration Municipal Bond Fund
Class Name Class A
Trading Symbol LITAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Intermediate Duration Municipal Bond Fund (the Fund) for the period of November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting pe
rio
d.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
61		0.59
%
Expenses Paid, Amount $ 61
Expense Ratio, Percent 0.59%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Class A shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Allocations
| Positive contributions to the Fund’s performance relative to the benchmark were driven by overweights to bonds with 17 years to maturity and longer, bonds rated A, BBB, BB and non-rated bonds, and continuing care retirement community (CCRC) bonds. Underweights to bonds with 2-6 years to maturity, bonds rated AAA and AA, and state general obligation bonds also added to relative performance.
Security selection
| Selection in continuing care retirement community (CCRC), charter school, airport, hospital, state general obligation and airline bonds added to performance relative to the benchmark. Selection in bonds rated BBB and bonds with 4-6 years to maturity also added to relative performance.
Top Performance Detractors
Allocations
| The Fund’s overweights to bonds with less than two years to maturity and pre-refunded bonds detracted from performance relative to the benchmark. Underweights to bonds with 12-17 years to maturity and pre-pay gas bonds also detracted from relative performance.
Security selection
| Selection in bonds rated AAA, AA and A, toll road, state general obligation and water & sewer bonds, and bonds with 8-12 years to maturity detracted from relative performance.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Class A (excluding sales charges)
(a),(b)
8.07 0.95 1.79
Class A (including sales charges)
(a),(b)
4.83 0.33 1.49
Bloomberg 3-15 Year Blend Municipal Bond Index7.861.122.14
Bloomberg Municipal Bond Index9.70 1.05 2.30
(a)
Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
(b)
The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
Material Change Date Aug. 01, 2024
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,573,010,350
Holdings Count | Holding 593
Advisory Fees Paid, Amount $ 7,413,951
Investment Company, Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,573,010,350
Total number of portfolio holdings593
Management services fees
(represents 0.47% of Fund average net assets)
$
7,413,951
Portfolio turnover for the reporting period13%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Der
iv
atives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top States/Territories
Illinois16.2
%
California10.9
%
New York8.2
%
Texas7.4
%
Florida4.8
%
Massachusetts3.9
%
New Jersey3.7
%
Pennsylvania3.7
%
Colorado3.2
%
District of Columbia3.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Material Fund Change [Text Block]
Certain Fund Changes
This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Material Fund Change Strategies [Text Block] Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates.
Material Fund Change Risks Change [Text Block] In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
Columbia Intermediate Duration Municipal Bond Fund - Advisor Class  
Shareholder Report [Line Items]  
Fund Name Columbia Intermediate Duration Municipal Bond Fund
Class Name Advisor Class
Trading Symbol CIMRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Intermediate Duration Municipal Bond Fund (the Fund) for the period of November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment
Advisor Class
$
41		 0.39
%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.39%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Advisor Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Allocations
| Positive contributions to the Fund’s performance relative to the benchmark were driven by overweights to bonds with 17 years to maturity and longer, bonds rated A, BBB, BB and non-rated bonds, and continuing care retirement community (CCRC) bonds. Underweights to bonds with 2-6 years to maturity, bonds rated AAA and AA, and state general obligation bonds also added to relative performance.
Security selection
| Selection in continuing care retirement community (CCRC), charter school, airport, hospital, state general obligation and airline bonds added to performance relative to the benchmark. Selection in bonds rated BBB and bonds with 4-6 years to maturity also added to relative performance.
Top Performance Detractors
Allocations
| The Fund’s overweights to bonds with less than two years to maturity and pre-refunded bonds detracted from performance relative to the benchmark. Underweights to bonds with 12-17 years to maturity and pre-pay gas bonds also detracted from relative performance.
Security selection
| Selection in bonds rated AAA, AA and A, toll road, state general obligation and water & sewer bonds, and bonds with 8-12 years to maturity detracted from relative performance.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%) 1 year 5 years 10 years
Advisor Class
(a),(b)
 8.28 1.15 1.99
Bloomberg 3-15 Year Blend Municipal Bond Index 7.86 1.12 2.14
Bloomberg Municipal Bond Index 9.70 1.05 2.30
(a)
Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
(b)
The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
Material Change Date Aug. 01, 2024
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,573,010,350
Holdings Count | Holding 593
Advisory Fees Paid, Amount $ 7,413,951
Investment Company, Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,573,010,350
Total number of portfolio holdings 593
Management services fees
(represents 0.47% of Fund average net assets)
$
7,413,951
Portfolio turnover for the reporting period 13%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top States/Territories
Illinois 16.2
%
California 10.9
%
New York 8.2
%
Texas 7.4
%
Florida 4.8
%
Massachusetts 3.9
%
New Jersey 3.7
%
Pennsylvania 3.7
%
Colorado 3.2
%
District of Columbia 3.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Material Fund Change [Text Block]
Certain Fund Changes
This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Material Fund Change Strategies [Text Block] Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates.
Material Fund Change Risks Change [Text Block] In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
Columbia Intermediate Duration Municipal Bond Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Columbia Intermediate Duration Municipal Bond Fund
Class Name Class C
Trading Symbol LITCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Intermediate Duration Municipal Bond Fund (the Fund) for the period of November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment
Class C
$
123		 1.19
%
Expenses Paid, Amount $ 123
Expense Ratio, Percent 1.19%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Class C shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Allocations
| Positive contributions to the Fund’s performance relative to the benchmark were driven by overweights to bonds with 17 years to maturity and longer, bonds rated A, BBB, BB and non-rated bonds, and continuing care retirement community (CCRC) bonds. Underweights to bonds with 2-6 years to maturity, bonds rated AAA and AA, and state general obligation bonds also added to relative performance.
Security selection
| Selection in continuing care retirement community (CCRC), charter school, airport, hospital, state general obligation and airline bonds added to performance relative to the benchmark. Selection in bonds rated BBB and bonds with 4-6 years to maturity also added to relative performance.
Top Performance Detractors
Allocations
| The Fund’s overweights to bonds with less than two years to maturity and pre-refunded bonds detracted from performance relative to the benchmark. Underweights to bonds with 12-17 years to maturity and pre-pay gas bonds also detracted from relative performance.
Security selection
| Selection in bonds rated AAA, AA and A, toll road, state general obligation and water & sewer bonds, and bonds with 8-12 years to maturity detracted from relative performance.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%) 1 year 5 years 10 years
Class C (excluding sales charges)
(a),(b)
 7.41 0.36 1.15
Class C (including sales charges)
(a),(b)
 6.41 0.36 1.15
Bloomberg 3-15 Year Blend Municipal Bond Index 7.86 1.12 2.14
Bloomberg Municipal Bond Index 9.70 1.05 2.30
(a)
Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
(b)
The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
Material Change Date Aug. 01, 2024
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,573,010,350
Holdings Count | Holding 593
Advisory Fees Paid, Amount $ 7,413,951
Investment Company, Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,573,010,350
Total number of portfolio holdings 593
Management services fees
(represents 0.47% of Fund average net assets)
$
7,413,951
Portfolio turnover for the reporting period 13%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top States/Territorie
s
Illinois 16.2
%
California 10.9
%
New York 8.2
%
Texas 7.4
%
Florida 4.8
%
Massachusetts 3.9
%
New Jersey 3.7
%
Pennsylvania 3.7
%
Colorado 3.2
%
District of Columbia 3.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Material Fund Change [Text Block]
Certain Fund Ch
an
ges
This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Material Fund Change Strategies [Text Block] Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates.
Material Fund Change Risks Change [Text Block] In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
Columbia Intermediate Duration Municipal Bond Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Intermediate Duration Municipal Bond Fund
Class Name Institutional Class
Trading Symbol SETMX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Intermediate Duration Municipal Bond Fund (the Fund) for the period of November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment
Institutional Class
$
41		 0.39
%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.39%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Institutional Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Allocations
| Positive contributions to the Fund’s performance relative to the benchmark were driven by overweights to bonds with 17 years to maturity and longer, bonds rated A, BBB, BB and non-rated bonds, and continuing care retirement community (CCRC) bonds. Underweights to bonds with 2-6 years to maturity, bonds rated AAA and AA, and state general obligation bonds also added to relative performance.
Security selection
| Selection in continuing care retirement community (CCRC), charter school, airport, hospital, state general obligation and airline bonds added to performance relative to the benchmark. Selection in bonds rated BBB and bonds with 4-6 years to maturity also added to relative performance.
Top Performance Detractors
Allocations
| The Fund’s overweights to bonds with less than two years to maturity and pre-refunded bonds detracted from performance relative to the benchmark. Underweights to bonds with 12-17 years to maturity and pre-pay gas bonds also detracted from relative performance.
Security selection
| Selection in bonds rated AAA, AA and A, toll road, state general obligation and water & sewer bonds, and bonds with 8-12 years to maturity detracted from relative performance.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%) 1 year 5 years 10 years
Institutional Class
(a),(b)
 8.28 1.15 2.00
Bloomberg 3-15 Year Blend Municipal Bond Index 7.86 1.12 2.14
Bloomberg Municipal Bond Index 9.70 1.05 2.30
(a)
Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
(b)
The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
Material Change Date Aug. 01, 2024
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,573,010,350
Holdings Count | Holding 593
Advisory Fees Paid, Amount $ 7,413,951
Investment Company, Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,573,010,350
Total number of portfolio holdings 593
Management services fees
(represents 0.47% of Fund average net assets)
$
7,413,951
Portfolio turnover for the reporting period 13%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top States/Territories
Illinois 16.2
%
California 10.9
%
New York 8.2
%
Texas 7.4
%
Florida 4.8
%
Massachusetts 3.9
%
New Jersey 3.7
%
Pennsylvania 3.7
%
Colorado 3.2
%
District of Columbia 3.1
%
Asset Cate
go
ries
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Material Fund Change [Text Block]
Certain Fund Changes
This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Material Fund Change Strategies [Text Block] Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates.
Material Fund Change Risks Change [Text Block] In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
Columbia Intermediate Duration Municipal Bond Fund - Institutional 2 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Intermediate Duration Municipal Bond Fund
Class Name Institutional 2 Class
Trading Symbol CTMRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Intermediate Duration Municipal Bond Fund (the Fund) for the period of November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
Class Cost of a $10,000 investment Cost paid as a percentage of a $
10,000
investment
Institutional 2 Class
$
34		 0.33
%
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.33%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Institutional 2 Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Allocations
| Positive contributions to the Fund’s performance relative to the benchmark were driven by overweights to bonds with 17 years to maturity and longer, bonds rated A, BBB, BB and non-rated bonds, and continuing care retirement community (CCRC) bonds. Underweights to bonds with 2-6 years to maturity, bonds rated AAA and AA, and state general obligation bonds also added to relative performance.
Security selection
| Selection in continuing care retirement community (CCRC), charter school, airport, hospital, state general obligation and airline bonds added to performance relative to the benchmark. Selection in bonds rated BBB and bonds with 4-6 years to maturity also added to relative performance.
Top Performance Detractors
Allocations
| The Fund’s overweights to bonds with less than two years to maturity and pre-refunded bonds detracted from performance relative to the benchmark. Underweights to bonds with 12-17 years to maturity and pre-pay gas bonds also detracted from relative performance.
Security selection
| Selection in bonds rated AAA, AA and A, toll road, state
general
obligation and water & sewer bonds, and bonds with 8-12 years to maturity detracted from relative performance.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%) 1 year 5 years 10 years
Institutional 2 Class
(a),(b)
 8.36 1.22 2.07
Bloomberg 3-15 Year Blend Municipal Bond Index 7.86 1.12 2.14
Bloomberg Municipal Bond Index 9.70 1.05 2.30
(a)
Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
(b)
The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
Material Change Date Aug. 01, 2024
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,573,010,350
Holdings Count | Holding 593
Advisory Fees Paid, Amount $ 7,413,951
Investment Company, Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,573,010,350
Total number of portfolio holdings 593
Management services fees
(represents 0.47% of Fund average net assets)
$
7,413,951
Portfolio turnover for the reporting period 13%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top States/Territories
Illinois 16.2
%
California 10.9
%
New York 8.2
%
Texas 7.4
%
Florida 4.8
%
Massachusetts 3.9
%
New Jersey 3.7
%
Pennsylvania 3.7
%
Colorado 3.2
%
District of Columbia 3.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Material Fund Change [Text Block]
Certain Fund Changes
This is a summary of certain changes to the Fund during the reporting period. For more complete
information
, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Material Fund Change Strategies [Text Block] Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates.
Material Fund Change Risks Change [Text Block] In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund during the reporting period. For more complete
information
, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
Columbia Intermediate Duration Municipal Bond Fund - Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Intermediate Duration Municipal Bond Fund
Class Name Institutional 3 Class
Trading Symbol CIMYX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Intermediate Duration Municipal Bond Fund (the Fund) for the period of November 1, 2023 to October 31, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting
period
?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
29		0.28
%
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.28%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Institutional 3 Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Allocations
| Positive contributions to the Fund’s performance relative to the benchmark were driven by overweights to bonds with 17 years to maturity and longer, bonds rated A, BBB, BB and non-rated bonds, and continuing care retirement community (CCRC) bonds. Underweights to bonds with 2-6 years to maturity, bonds rated AAA and AA, and state general obligation bonds also added to relative performance.
Security selection
| Selection in continuing care retirement community (CCRC), charter school, airport, hospital, state general obligation and airline bonds added to performance relative to the benchmark. Selection in bonds rated BBB and bonds with 4-6 years to maturity also added to relative performance.
Top Performance Detractors
Allocations
| The Fund’s overweights to bonds with less than two years to maturity and pre-refunded bonds detracted from performance relative to the benchmark. Underweights to bonds with 12-17 years to maturity and pre-pay gas bonds also detracted from relative performance.
Security selection
| Selection in bonds rated AAA, AA and A, toll road, state general obligation and water & sewer bonds, and bonds with 8-12 years to maturity detracted from relative performance.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Institutional 3 Class
(a),(b),(c)
8.401.252.08
Bloomberg 3-15 Year Blend Municipal Bond Index7.861.122.14
Bloomberg Municipal Bond Index9.701.052.30
(a)
The returns shown for periods prior to March 1, 2017 (including returns for the Life of the Fund, if shown, which are since Fund inception) include the returns of Institutional Class. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit
columbiathreadneedleus.com/investor/investment-products/mutual-funds/appended-performance
for more information.
(b)
Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
(c)
The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
Material Change Date Aug. 01, 2024
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,573,010,350
Holdings Count | Holding 593
Advisory Fees Paid, Amount $ 7,413,951
Investment Company, Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,573,010,350
Total number of portfolio holdings593
Management services fees
(represents 0.47% of Fund average net assets)
$
7,413,951
Portfolio turnover for the reporting period13%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net
assets
. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top States/Territories
Illinois16.2
%
California10.9
%
New York8.2
%
Texas7.4
%
Florida4.8
%
Massachusetts3.9
%
New Jersey3.7
%
Pennsylvania3.7
%
Colorado3.2
%
District of Columbia3.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Material Fund Change [Text Block]
Certain Fund Changes
This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Material Fund Change Strategies [Text Block] Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates.
Material Fund Change Risks Change [Text Block] In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
Columbia Intermediate Duration Municipal Bond Fund - Class S  
Shareholder Report [Line Items]  
Fund Name Columbia Intermediate Duration Municipal Bond Fund
Class Name Class S
Trading Symbol SETDX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Intermediate Duration Municipal Bond Fund (the Fund) for the period of October 2, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Material Fund Change Notice [Text Block] This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting
period
?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
3
(a)
0.39
%
(b)
(a)
Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.
(b)
Annualized.
Expenses Paid, Amount $ 3 [1]
Expense Ratio, Percent 0.39% [2]
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Class S shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Allocations
| Positive contributions to the Fund’s performance relative to the benchmark were driven by overweights to bonds with 17 years to maturity and longer, bonds rated A, BBB, BB and non-rated bonds, and continuing care retirement community (CCRC) bonds. Underweights to bonds with 2-6 years to maturity, bonds rated AAA and AA, and state general obligation bonds also added to relative performance.
Security selection
| Selection in continuing care retirement community (CCRC), charter school, airport, hospital, state general obligation and airline bonds added to performance relative to the benchmark. Selection in bonds rated BBB and bonds with 4-6 years to maturity also added to relative performance.
Top Performance Detractors
Allocations
| The Fund’s overweights to bonds with less than two years to maturity and pre-refunded bonds detracted from performance relative to the benchmark. Underweights to bonds with 12-17 years to maturity and pre-pay gas bonds also detracted from relative performance.
Security selection
| Selection in bonds rated AAA, AA and A, toll road, state general obligation and water & sewer bonds, and bonds with 8-12 years to maturity detracted from relative performance.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block] Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Class S
(a),(b),(c)
8.27 1.15 2.00
Bloomberg 3-15 Year Blend Municipal Bond Index7.86 1.12 2.14
Bloomberg Municipal Bond Index9.70 1.05 2.30
(a)
The returns shown for periods prior to October 2, 2024 (including returns for the Life of the Fund, if shown, which are since Fund inception) include the returns of Institutional Class. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit
columbiathreadneedleus.com/investor/investment-products/mutual-funds/appended-performance
for more information.
(b)
Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements. The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
(c)
The Fund’s performance prior to September 1, 2022 reflects returns achieved according to different principal investment strategies. If the Fund’s current strategies had been in place for the prior periods, results shown may have been different.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performance to the Bloomberg Municipal Bond Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund’s performance is also compared to its prior benchmark, which more closely represents the market sectors and/or asset classes in which the Fund primarily invests.
Material Change Date Aug. 01, 2024
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,573,010,350
Holdings Count | Holding 593
Advisory Fees Paid, Amount $ 7,413,951
Investment Company, Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,573,010,350
Total number of portfolio holdings593
Management services fees
(represents 0.47% of Fund average net assets)
$
7,413,951
Portfolio turnover for the reporting period13%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top States/Territories
Illinois16.2
%
California10.9
%
New York8.2
%
Texas7.4
%
Florida4.8
%
Massachusetts3.9
%
New Jersey3.7
%
Pennsylvania3.7
%
Colorado3.2
%
District of Columbia3.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit
Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Material Fund Change [Text Block]
Certain Fund Changes
This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates. In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Material Fund Change Strategies [Text Block] Effective August 1, 2024, the Fund amended its Prospectus’ Principal Investment Strategies to reflect that the Fund may enter into tender option bond (TOB) transactions and may invest in derivatives, such as floating rate municipal securities (floaters) and inverse floating rate municipal securities (inverse floaters) to add incremental income, futures (including interest rate and Treasury bond futures) to manage duration and hedge against changes in interest rates, and swaps, including Municipal Market Data Rate Locks (MMD Rate Locks) to manage duration and hedge against changes in interest rates.
Material Fund Change Risks Change [Text Block] In addition, the Fund amended its Prospectus’ Principal Risks to include disclosure of the risks associated with investing in these instruments and derivatives generally.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund during the reporting period. For more complete information, you may review the Fund’s prospectus, which is available at
columbiathreadneedleus.com/resources/literature
or upon request at 1-800-345-6611.
Updated Prospectus Phone Number 1-800-345-6611
Updated Prospectus Web Address columbiathreadneedleus.com/resources/literature
[1] Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.
[2] Annualized.