Shareholder Report |
12 Months Ended | |||||||||||||||||||||||
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Apr. 30, 2025
USD ($)
Holding
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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 | Apr. 30, 2025 | |||||||||||||||||||||||
Columbia Small Cap Value Fund I - Class A | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia Small Cap Value Fund I | |||||||||||||||||||||||
Class Name | Class A | |||||||||||||||||||||||
Trading Symbol | CSMIX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to April 30, 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.
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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)
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Expenses Paid, Amount | $ 120 | |||||||||||||||||||||||
Expense Ratio, Percent | 1.21% | |||||||||||||||||||||||
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
Stock selection | Selections in the information technology, financials and utilities sectors boosted the Fund’s relative results most during the annual period.Allocations | Smaller allocations to the energy and health care sectors and a larger allocation to the information technology sector buoyed Fund relative results during the annual period.Individual holdings | Positions in ThredUp, Inc., an online clothing resale platform; Insmed, Inc., a biopharmaceutical company; Kyndryl Holdings, Inc., an information systems company; Cerence, Inc., a developer of AI assistants for cars; and StoneX Group, Inc., a financial services company, were among the top absolute contributors to Fund performance.Top Performance Detractors
Stock selection | Selections in the consumer discretionary, consumer staples and real estate sectors hurt the Fund’s relative results during the annual period.Allocations | Smaller weightings to the financials and utilities sectors and a larger allocation to the consumer discretionary sector detracted from relative performance.Individual holdings | Fund positions in Synaptics, Inc., a smart tech developer; Tronox Holdings PLC, a chemicals company; Murphy Oil Corp., an oil and natural gas company; KinderCare Learning Cos, Inc., a daycare and preschool operator; and Apellis Pharmaceuticals, Inc., a biopharmaceutical company, were top absolute detractors during the period. |
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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] | ![]() |
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Average Annual Return [Table Text Block] |
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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 Russell 3000 ® Index, a broad-based performance index as required by new regulatory requirements.
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Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmark, which management believes more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 1,436,927,343 | |||||||||||||||||||||||
Holdings Count | Holding | 216 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 12,206,095 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 72.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
Key Fund S tatis tics
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Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the
tab les unless otherwise noted. The Fund's portfolio composition is subject to change.Top Holdings
Asset Categories ![]() Equity Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Holdings
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Columbia Small Cap Value Fund I - Class C | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia Small Cap Value Fund I | |||||||||||||||||||||||
Class Name | Class C | |||||||||||||||||||||||
Trading Symbol | CSSCX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to April 30, 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.
|
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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)
|
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Expenses Paid, Amount | $ 194 | |||||||||||||||||||||||
Expense Ratio, Percent | 1.96% | |||||||||||||||||||||||
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
Stock selection | Selections in the information technology, financials and utilities sectors boosted the Fund’s relative results most during the annual period.Allocations | Smaller allocations to the energy and health care sectors and a larger allocation to the information technology sector buoyed Fund relative results during the annual period.Individual holdings | Positions in ThredUp, Inc., an online clothing resale platform; Insmed, Inc., a biopharmaceutical company; Kyndryl Holdings, Inc., an information systems company; Cerence, Inc., a developer of AI assistants for cars; and StoneX Group, Inc., a financial services company, were among the top absolute contributors to Fund performance.Top Performance Detractors
Stock selection | Selections in the consumer discretionary, consumer staples and real estate sectors hurt the Fund’s relative results during the annual period.Allocations | Smaller weightings to the financials and utilities sectors and a larger allocation to the consumer discretionary sector detracted from relative performance.Individual holdings | Fund positions in Synaptics, Inc., a smart tech developer; Tronox Holdings PLC, a chemicals company; Murphy Oil Corp., an oil and natural gas company; KinderCare Learning Cos, Inc., a daycare and preschool operator; and Apellis Pharmaceuticals, Inc., a biopharmaceutical company, were top absolute detractors during the period. |
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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] | ![]() |
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Average Annual Return [Table Text Block] |
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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 Russell 3000 ® Index, a broad-based performance index as required by new regulatory requirements.
|
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Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmark, which management believes more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
|
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Net Assets | $ 1,436,927,343 | |||||||||||||||||||||||
Holdings Count | Holding | 216 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 12,206,095 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 72.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
Key F u nd Statistics
|
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Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the ta
bl es unless otherwise noted. The Fund's portfolio composition is subject to change.Top Holdings
Asset Categories ![]() Equity Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Holdings
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Columbia Small Cap Value Fund I - Institutional Class | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia Small Cap Value Fund I | |||||||||||||||||||||||
Class Name | Institutional Class | |||||||||||||||||||||||
Trading Symbol | CSCZX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to April 30, 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.
|
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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)
|
|||||||||||||||||||||||
Expenses Paid, Amount | $ 96 | |||||||||||||||||||||||
Expense Ratio, Percent | 0.96% | |||||||||||||||||||||||
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
Stock selection | Selections in the information technology, financials and utilities sectors boosted the Fund’s relative results most during the annual period.Allocations | Smaller allocations to the energy and health care sectors and a larger allocation to the information technology sector buoyed Fund relative results during the annual period.Individual holdings | Positions in ThredUp, Inc., an online clothing resale platform; Insmed, Inc., a biopharmaceutical company; Kyndryl Holdings, Inc., an information systems company; Cerence, Inc., a developer of AI assistants for cars; and StoneX Group, Inc., a financial services company, were among the top absolute contributors to Fund performance.Top Performance Detractors
Stock selection | Selections in the consumer discretionary, consumer staples and real estate sectors hurt the Fund’s relative results during the annual period.Allocations | Smaller weightings to the financials and utilities sectors and a larger allocation to the consumer discretionary sector detracted from relative performance.Individual holdings | Fund positions in Synaptics, Inc., a smart tech developer; Tronox Holdings PLC, a chemicals company; Murphy Oil Corp., an oil and natural gas company; KinderCare Learning Cos, Inc., a daycare and preschool operator; and Apellis Pharmaceuticals, Inc., a biopharmaceutical company, were top absolute detractors during the period. |
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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] | ![]() |
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Average Annual Return [Table Text Block] |
|
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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 Russell 3000 ® Index, a broad-based performance index as required by new regulatory requirements.
|
|||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmark, which management believes more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
|
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Net Assets | $ 1,436,927,343 | |||||||||||||||||||||||
Holdings Count | Holding | 216 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 12,206,095 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 72.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
Key Fu n d Statistics
|
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Holdings [Text Block] | Graphical Representation of Fund 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 oth
erw ise noted. The Fund's portfolio composition is subject to change.Top Holdings
Asset Categories ![]() Equity Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Holdings
|
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Columbia Small Cap Value Fund I - Institutional 2 Class | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia Small Cap Value Fund I | |||||||||||||||||||||||
Class Name | Institutional 2 Class | |||||||||||||||||||||||
Trading Symbol | CUURX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to April 30, 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.
|
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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)
|
|||||||||||||||||||||||
Expenses Paid, Amount | $ 87 | |||||||||||||||||||||||
Expense Ratio, Percent | 0.87% | |||||||||||||||||||||||
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
Stock selection | Selections in the information technology, financials and utilities sectors boosted the Fund’s relative results most during the annual period.Allocations | Smaller allocations to the energy and health care sectors and a larger allocation to the information technology sector buoyed Fund relative results during the annual period.Individual holdings | Positions in ThredUp, Inc., an online clothing resale platform; Insmed, Inc., a biopharmaceutical company; Kyndryl Holdings, Inc., an information systems company; Cerence, Inc., a developer of AI assistants for cars; and StoneX Group, Inc., a financial services company, were among the top absolute contributors to Fund performance.Top Performance Detractors
Stock selection | Selections in the consumer discretionary, consumer staples and real estate sectors hurt the Fund’s relative results during the annual period.Allocations | Smaller weightings to the financials and utilities sectors and a larger allocation to the consumer discretionary sector detracted from relative performance.Individual holdings | Fund positions in Synaptics, Inc., a smart tech developer; Tronox Holdings PLC, a chemicals company; Murphy Oil Corp., an oil and natural gas company; KinderCare Learning Cos, Inc., a daycare and preschool operator; and Apellis Pharmaceuticals, Inc., a biopharmaceutical company, were top absolute detractors during the period. |
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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] | ![]() |
|||||||||||||||||||||||
Average Annual Return [Table Text Block] |
|
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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 Russell 3000 ® Index, a broad-based performance index as required by new regulatory requirements.
|
|||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmark, which management believes more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
|
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Net Assets | $ 1,436,927,343 | |||||||||||||||||||||||
Holdings Count | Holding | 216 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 12,206,095 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 72.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
Key Fund S ta tistics
|
|||||||||||||||||||||||
Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables u
nle ss otherwise noted. The Fund's portfolio composition is subject to change.Top Holdings
Asset Categories ![]() Equity Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Holdings
|
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Columbia Small Cap Value Fund I - Institutional 3 Class | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia Small Cap Value Fund I | |||||||||||||||||||||||
Class Name | Institutional 3 Class | |||||||||||||||||||||||
Trading Symbol | CSVYX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to April 30, 2025.
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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.
|
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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)
|
|||||||||||||||||||||||
Expenses Paid, Amount | $ 82 | |||||||||||||||||||||||
Expense Ratio, Percent | 0.82% | |||||||||||||||||||||||
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
Stock selection | Selections in the information technology, financials and utilities sectors boosted the Fund’s relative results most during the annual period.Allocations | Smaller allocations to the energy and health care sectors and a larger allocation to the information technology sector buoyed Fund relative results during the annual period.Individual holdings | Positions in ThredUp, Inc., an online clothing resale platform; Insmed, Inc., a biopharmaceutical company; Kyndryl Holdings, Inc., an information systems company; Cerence, Inc., a developer of AI assistants for cars; and StoneX Group, Inc., a financial services company, were among the top absolute contributors to Fund performance.Top Performance Detractors
Stock selection | Selections in the consumer discretionary, consumer staples and real estate sectors hurt the Fund’s relative results during the annual period.Allocations | Smaller weightings to the financials and utilities sectors and a larger allocation to the consumer discretionary sector detracted from relative performance.Individual holdings | Fund positions in Synaptics, Inc., a smart tech developer; Tronox Holdings PLC, a chemicals company; Murphy Oil Corp., an oil and natural gas company; KinderCare Learning Cos, Inc., a daycare and preschool operator; and Apellis Pharmaceuticals, Inc., a biopharmaceutical company, were top absolute detractors during the period. |
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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] | ![]() |
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Average Annual Return [Table Text Block] |
|
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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 Russell 3000 ® Index, a broad-based performance index as required by new regulatory requirements.
|
|||||||||||||||||||||||
Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmark, which management believes more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
|
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Net Assets | $ 1,436,927,343 | |||||||||||||||||||||||
Holdings Count | Holding | 216 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 12,206,095 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 72.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
Key Fund Sta tis tics
|
|||||||||||||||||||||||
Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the t
abl es unless otherwise noted. The Fund's portfolio composition is subject to change.Top Holdings
Asset Categories ![]() Equity Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Holdings
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Columbia Small Cap Value Fund I - Class R | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia Small Cap Value Fund I | |||||||||||||||||||||||
Class Name | Class R | |||||||||||||||||||||||
Trading Symbol | CSVRX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to April 30, 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.
|
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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)
|
|||||||||||||||||||||||
Expenses Paid, Amount | $ 145 | |||||||||||||||||||||||
Expense Ratio, Percent | 1.46% | |||||||||||||||||||||||
Factors Affecting Performance [Text Block] | Management's Discussion of Fund Performance The performance of Class R shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Stock selection | Selections in the information technology, financials and utilities sectors boosted the Fund’s relative results most during the annual period.Allocations | Smaller allocations to the energy and health care sectors and a larger allocation to the information technology sector buoyed Fund relative results during the annual period.Individual holdings | Positions in ThredUp, Inc., an online clothing resale platform; Insmed, Inc., a biopharmaceutical company; Kyndryl Holdings, Inc., an information systems company; Cerence, Inc., a developer of AI assistants for cars; and StoneX Group, Inc., a financial services company, were among the top absolute contributors to Fund performance.Top Performance Detractors
Stock selection | Selections in the consumer discretionary, consumer staples and real estate sectors hurt the Fund’s relative results during the annual period.Allocations | Smaller weightings to the financials and utilities sectors and a larger allocation to the consumer discretionary sector detracted from relative performance.Individual holdings | Fund positions in Synaptics, Inc., a smart tech developer; Tronox Holdings PLC, a chemicals company; Murphy Oil Corp., an oil and natural gas company; KinderCare Learning Cos, Inc., a daycare and preschool operator; and Apellis Pharmaceuticals, Inc., a biopharmaceutical company, were top absolute detractors during the period. |
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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] | ![]() |
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Average Annual Return [Table Text Block] |
|
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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 Russell 3000 ® Index, a broad-based performance index as required by new regulatory requirements.
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Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmark, which management believes more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 1,436,927,343 | |||||||||||||||||||||||
Holdings Count | Holding | 216 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 12,206,095 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 72.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
Key Fund St ati stics
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Holdings [Text Block] | Graphical Representation of Fund 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
other wise noted. The Fund's portfolio composition is subject to change.Top Holdings
Asset Categories ![]() Equity Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Holdings
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Columbia Small Cap Value Fund I - Class S | ||||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||||
Fund Name | Columbia Small Cap Value Fund I | |||||||||||||||||||||||
Class Name | Class S | |||||||||||||||||||||||
Trading Symbol | CSCQX | |||||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of October 2, 2024 to April 30, 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/literatur e1-800-345-6611.
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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)
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Expenses Paid, Amount | $ 52 | [1] | ||||||||||||||||||||||
Expense Ratio, Percent | 0.95% | [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
Stock selection | Selections in the information technology, financials and utilities sectors boosted the Fund’s relative results most during the annual period.Allocations | Smaller allocations to the energy and health care sectors and a larger allocation to the information technology sector buoyed Fund relative results during the annual period.Individual holdings | Positions in ThredUp, Inc., an online clothing resale platform; Insmed, Inc., a biopharmaceutical company; Kyndryl Holdings, Inc., an information systems company; Cerence, Inc., a developer of AI assistants for cars; and StoneX Group, Inc., a financial services company, were among the top absolute contributors to Fund performance.Top Performance Detractors
Stock selection | Selections in the consumer discretionary, consumer staples and real estate sectors hurt the Fund’s relative results during the annual period.Allocations | Smaller weightings to the financials and utilities sectors and a larger allocation to the consumer discretionary sector detracted from relative performance.Individual holdings | Fund positions in Synaptics, Inc., a smart tech developer; Tronox Holdings PLC, a chemicals company; Murphy Oil Corp., an oil and natural gas company; KinderCare Learning Cos, Inc., a daycare and preschool operator; and Apellis Pharmaceuticals, Inc., a biopharmaceutical company, were top absolute detractors during the period. |
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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] | ![]() |
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Average Annual Return [Table Text Block] |
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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 Russell 3000 ® Index, a broad-based performance index as required by new regulatory requirements.
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Prior Market Index Comparison [Text Block] | The Fund’s performance also continues to be compared to its prior benchmark, which management believes more closely represents the market sectors and/or asset classes in which the Fund primarily invests. | |||||||||||||||||||||||
Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds for more recent performance information.
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Net Assets | $ 1,436,927,343 | |||||||||||||||||||||||
Holdings Count | Holding | 216 | |||||||||||||||||||||||
Advisory Fees Paid, Amount | $ 12,206,095 | |||||||||||||||||||||||
Investment Company, Portfolio Turnover | 72.00% | |||||||||||||||||||||||
Additional Fund Statistics [Text Block] |
Key Fund S tat istics
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Holdings [Text Block] | Graphical Representation of Fund 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 oth
erwi se noted. The Fund's portfolio composition is subject to change.Top Holdings
Asset Categories ![]() Equity Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Holdings
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