v3.25.2
Shareholder Report
 12 Months Ended
May 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Columbia Funds Series Trust II
Entity Central Index Key 0001352280
Entity Investment Company Type N-1A
Document Period End Date May 31, 2025
Columbia Quality Income Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Quality Income Fund
Class Name Class A
Trading Symbol AUGAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Quality Income Fund (the Fund) for the period of June 1, 2024 to May 31, 2025.
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.
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
$
93		0.89
%
Expenses Paid, Amount $ 93
Expense Ratio, Percent 0.89%
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
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor of the Fund's 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)8.81(0.89
)
0.85
Class A (including sales charges)5.54 (1.49
)
0.54
Bloomberg U.S. Mortgage-Backed Securities Index5.88 (0.97
)
1.04
Bloomberg U.S. Aggregate Bond Index5.46 (0.90
)
1.49
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,274,068,619
Holdings Count | Holding 339
Advisory Fees Paid, Amount $ 6,652,421
Investment Company, Portfolio Turnover 330.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,274,068,619
Total number of portfolio holdings
339
Management services fees
(represents 0.49% of Fund average net assets)
$
6,652,421
Portfolio turnover for the reporting period
330%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
17%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment m
ak
eup 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 Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		4.8
%
Government National Mortgage Association
05/20/2051 2.500%		2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		1.6
%
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.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		4.8
%
Government National Mortgage Association
05/20/2051 2.500%		2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		1.6
%
Columbia Quality Income Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Columbia Quality Income Fund
Class Name Class C
Trading Symbol AUGCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Quality Income Fund (the Fund) for the period of June 1, 2024 to May 31, 2025.
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.
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 C
$
170		1.64
%
Expenses Paid, Amount $ 170
Expense Ratio, Percent 1.64%
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
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor of the Fund's 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 C (excluding sales charges)7.99 (1.63
)
0.09
Class C (including sales charges)6.99 (1.63
)
0.09
Bloomberg U.S. Mortgage-Backed Securities Index5.88(0.97
)
1.04
Bloomberg U.S. Aggregate Bond Index5.46 (0.90
)
1.49
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,274,068,619
Holdings Count | Holding 339
Advisory Fees Paid, Amount $ 6,652,421
Investment Company, Portfolio Turnover 330.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,274,068,619
Total number of portfolio holdings
339
Management services fees
(represents 0.49% of Fund average net assets)
$
6,652,421
Portfolio turnover for the reporting period
330%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
17%
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 Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		4.8
%
Government National Mortgage Association
05/20/2051 2.500%		2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		1.6
%
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.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		4.8
%
Government National Mortgage Association
05/20/2051 2.500%		2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		1.6
%
Columbia Quality Income Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Quality Income Fund
Class Name Institutional Class
Trading Symbol CUGZX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Quality Income Fund (the Fund) for the period of June 1, 2024 to May 31, 2025.
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.
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 Class
$
67		0.64
%
Expenses Paid, Amount $ 67
Expense Ratio, Percent 0.64%
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
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor of the Fund's 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 Class9.08 (0.65
)
1.10
Bloomberg U.S. Mortgage-Backed Securities Index5.88 (0.97
)
1.04
Bloomberg U.S. Aggregate Bond Index5.46 (0.90
)
1.49
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,274,068,619
Holdings Count | Holding 339
Advisory Fees Paid, Amount $ 6,652,421
Investment Company, Portfolio Turnover 330.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,274,068,619
Total number of portfolio holdings
339
Management services fees
(represents 0.49% of Fund average net assets)
$
6,652,421
Portfolio turnover for the reporting period
330%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
17%
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 Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		4.8
%
Government National Mortgage Association
05/20/2051 2.500%		2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		1.6
%
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.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		4.8
%
Government National Mortgage Association
05/20/2051 2.500%		2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		1.6
%
Columbia Quality Income Fund - Institutional 2 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Quality Income Fund
Class Name Institutional 2 Class
Trading Symbol CGVRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Quality Income Fund (the Fund) for the period of June 1, 2024 to May 31, 2025.
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.
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
$
57		 0.55
%
Expenses Paid, Amount $ 57
Expense Ratio, Percent 0.55%
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
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor of the Fund's 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 9.18 (0.56
)
 1.19
Bloomberg U.S. Mortgage-Backed Securities Index 5.88 (0.97
)
 1.04
Bloomberg U.S. Aggregate Bond Index 5.46 (0.90
)
 1.49
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,274,068,619
Holdings Count | Holding 339
Advisory Fees Paid, Amount $ 6,652,421
Investment Company, Portfolio Turnover 330.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,274,068,619
Total number of portfolio holdings
 339
Management services fees
(represents 0.49% of Fund average net assets)
$
6,652,421
Portfolio turnover for the reporting period
 330%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
 17%
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 Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		 8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		 7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		 4.8
%
Government National Mortgage Association
05/20/2051 2.500%		 2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		 2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		 2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		 1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		 1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		 1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		 1.6
%
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.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		 8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		 7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		 4.8
%
Government National Mortgage Association
05/20/2051 2.500%		 2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		 2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		 2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		 1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		 1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		 1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		 1.6
%
Columbia Quality Income Fund - Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Quality Income Fund
Class Name Institutional 3 Class
Trading Symbol CUGYX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Quality Income Fund (the Fund) for the period of June 1, 2024 to May 31, 2025.
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.
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 3 Class
$
52		 0.50
%
Expenses Paid, Amount $ 52
Expense Ratio, Percent 0.50%
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
Interest rate positioning
| The Fund’s positioning with respect to interest rates contributed most to relative and absolute outperformance. Specifically, the Fund had an above-benchmark stance with respect to duration and corresponding interest rate sensitivity as short- and intermediate-term U.S. Treasury yields moved lower over the period. The Fund’s rate positioning also benefitted from a steepening yield curve over the period.
Agency residential mortgage-backed securities
| Performance for the Fund’s agency passthrough and collateralized mortgage obligation (CMO) holdings gained against a backdrop of falling interest rates and a steepening yield curve.
Non-agency residential mortgage-backed securities
| Non-agency residential mortgage-backed securities drove relative (the benchmark does not hold these securities) and absolute outperformance as housing fundamentals remained strong and borrower delinquencies remained low.
Top Performance Detractors
There were no material detractors to Fund performance during the period.
Performance Past Does Not Indicate Future [Text] The Fund's past performance is not a good predictor of the Fund's 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 3 Class 9.25 (0.52
)
 1.26
Bloomberg U.S. Mortgage-Backed Securities Index 5.88 (0.97
)
 1.04
Bloomberg U.S. Aggregate Bond Index 5.46 (0.90
)
 1.49
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,274,068,619
Holdings Count | Holding 339
Advisory Fees Paid, Amount $ 6,652,421
Investment Company, Portfolio Turnover 330.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,274,068,619
Total number of portfolio holdings
 339
Management services fees
(represents 0.49% of Fund average net assets)
$
6,652,421
Portfolio turnover for the reporting period
 330%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
 17%
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 Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		 8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		 7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		 4.8
%
Government National Mortgage Association
05/20/2051 2.500%		 2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		 2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		 2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		 1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		 1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		 1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		 1.6
%
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.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
06/13/2054 4.500%		 8.2
%
Uniform Mortgage-Backed Security TBA
06/12/2055 3.500%		 7.9
%
Government National Mortgage Association TBA
06/20/2054 4.500%		 4.8
%
Government National Mortgage Association
05/20/2051 2.500%		 2.7
%
Uniform Mortgage-Backed Security TBA
06/18/2040 3.000%		 2.7
%
Federal National Mortgage Association
08/01/2052 4.000%		 2.3
%
Uniform Mortgage-Backed Security TBA
06/13/2054 3.000%		 1.9
%
Federal National Mortgage Association
11/01/2052 4.500%		 1.8
%
Uniform Mortgage-Backed Security TBA
06/13/2054 2.000%		 1.8
%
Federal Home Loan Mortgage Corp.
08/01/2052 3.000%		 1.6
%