| Shareholder Report | 12 Months Ended |
| Aug. 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 | Aug. 31, 2024 |
| Columbia Strategic Income Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Strategic Income Fund |
| Class Name | Class A |
| Trading Symbol | COSIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Strategic Income Fund (the Fund) for the period of September 1, 2023 to August 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 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 Class A $ 0.93 % |
| Expenses Paid, Amount | $ 98 |
| Expense Ratio, Percent | 0.93% |
| 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 Duration Allocations Security selection Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Class A (excluding sales charges) 10.54 2.59 3.12 Class A (including sales charges) 5.31 1.59 2.62 Bloomberg U.S. Aggregate Bond Index 7.30 (0.04 ) 1.64 ICE BofA US Cash Pay High Yield Constrained Index 12.37 4.24 4.55 FTSE Non-U.S. World Government Bond (All Maturities) Index – Unhedged 5.46 (4.10 ) (1.73 ) JPMorgan Emerging Markets Bond Index - Global 12.69 0.76 2.69 |
| 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 |
| Net Assets | $ 5,661,996,222 |
| Holdings Count | Holding | 1,163 |
| Advisory Fees Paid, Amount | $ 29,323,389 |
| Investment Company, Portfolio Turnover | 272% |
| Additional Fund Statistics [Text Block] | Fund net assets $ Total number of portfolio holdings 1,163 Management services fees $ Portfolio turnover for the reporting period 272% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 52% |
| Holdings [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, 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 Derivative Exposure Long Credit Risk 0.9 % Interest Rate Risk 50.7 % Short Credit Risk 2.2 % Foreign Exchange Risk 0.4 % Interest Rate Risk 70.8 % Asset Categories Credit Quality |
| 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, 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 |
| Updated Prospectus Web Address | columbiathreadneedleus.com/investment-products/mutual-funds |
| Columbia Strategic Income Fund - Advisor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Strategic Income Fund |
| Class Name | Advisor Class |
| Trading Symbol | CMNRX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Strategic Income Fund (the Fund) for the period of September 1, 2023 to August 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 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 Advisor Class $ 0.68 % |
| Expenses Paid, Amount | $ 71 |
| Expense Ratio, Percent | 0.68% |
| 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 Duration Allocations Security selection Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Advisor Class 10.86 2.85 3.38 Bloomberg U.S. Aggregate Bond Index 7.30 (0.04 ) 1.64 ICE BofA US Cash Pay High Yield Constrained Index 12.37 4.24 4.55 FTSE Non-U.S. World Government Bond (All Maturities) Index – Unhedged 5.46 (4.10 ) (1.73 ) JPMorgan Emerging Markets Bond Index - Global 12.69 0.76 2.69 |
| 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 |
| Net Assets | $ 5,661,996,222 |
| Holdings Count | Holding | 1,163 |
| Advisory Fees Paid, Amount | $ 29,323,389 |
| Investment Company, Portfolio Turnover | 272% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 1,163 Management services fees $ Portfolio turnover for the reporting period 272% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 52% |
| Holdings [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, 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, S&P and Fitch, but has a rating by Kroll and/or DBRS, the same methodology is appli ed Derivative Exposure Long Credit Risk 0.9 % Interest Rate Risk 50.7 % Short Credit Risk 2.2 % Foreign Exchange Risk 0.4 % Interest Rate Risk 70.8 % Asset Categories Credit Quality |
| 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, 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, S&P and Fitch, but has a rating by Kroll and/or DBRS, the same methodology is appli ed |
| Updated Prospectus Web Address | columbiathreadneedleus.com/investment-products/mutual-funds |
| Columbia Strategic Income Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Strategic Income Fund |
| Class Name | Class C |
| Trading Symbol | CLSCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Strategic Income Fund (the Fund) for the period of September 1, 2023 to August 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 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 Class C $ 1.68 % |
| Expenses Paid, Amount | $ 176 |
| Expense Ratio, Percent | 1.68% |
| 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 Duration Allocations Security selection Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Class C (excluding sales charges) 9.73 1.82 2.34 Class C (including sales charges) 8.73 1.82 2.34 Bloomberg U.S. Aggregate Bond Index 7.30 (0.04 ) 1.64 ICE BofA US Cash Pay High Yield Constrained Index 12.37 4.24 4.55 FTSE Non-U.S. World Government Bond (All Maturities) Index – Unhedged 5.46 (4.10 ) (1.73 ) JPMorgan Emerging Markets Bond Index - Global 12.69 0.76 2.69 |
| No Deduction of Taxes [Text Block] | Performance does not reflect the deduction of taxes that a shareholder may pay on fund |
| Updated Performance Information Location [Text Block] | Visit columbiathreadneedleus.com/investment-products/mutual-funds |
| Net Assets | $ 5,661,996,222 |
| Holdings Count | Holding | 1,163 |
| Advisory Fees Paid, Amount | $ 29,323,389 |
| Investment Company, Portfolio Turnover | 272% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 1,163 Management services fees $ Portfolio turnover for the reporting period 272% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 52% |
| Holdings [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, 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, S&P and 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. Derivative Exposure Long Credit Risk 0.9 % Interest Rate Risk 50.7 % Short Credit Risk 2.2 % Foreign Exchange Risk 0.4 % Interest Rate Risk 70.8 % Asset Categories Credit Quality |
| 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, 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, S&P and 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. |
| Updated Prospectus Web Address | columbiathreadneedleus.com/investment-products/mutual-funds |
| Columbia Strategic Income Fund - Institutional Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Strategic Income Fund |
| Class Name | Institutional Class |
| Trading Symbol | LSIZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Strategic Income Fund (the Fund) for the period of September 1, 2023 to August 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 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 Class $ 0.68 % |
| Expenses Paid, Amount | $ 71 |
| Expense Ratio, Percent | 0.68% |
| 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 Duration Allocations Security selection Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Institutional Class 10.84 2.83 3.37 Bloomberg U.S. Aggregate Bond Index 7.30 (0.04 ) 1.64 ICE BofA US Cash Pay High Yield Constrained Index 12.37 4.24 4.55 FTSE Non-U.S. World Government Bond (All Maturities) Index – Unhedged 5.46 (4.10 ) (1.73 ) JPMorgan Emerging Markets Bond Index - Global 12.69 0.76 2.69 |
| 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 |
| Net Assets | $ 5,661,996,222 |
| Holdings Count | Holding | 1,163 |
| Advisory Fees Paid, Amount | $ 29,323,389 |
| Investment Company, Portfolio Turnover | 272% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 1,163 Management services fees $ Portfolio turnover for the reporting period 272% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 52% |
| Holdings [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, 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, S&P and 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 age nc Derivative Exposure Long Credit Risk 0.9 % Interest Rate Risk 50.7 % Short Credit Risk 2.2 % Foreign Exchange Risk 0.4 % Interest Rate Risk 70.8 % Asset Categories Credit Quality |
| 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, 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, S&P and 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 age nc |
| Updated Prospectus Web Address | columbiathreadneedleus.com/investment-products/mutual-funds |
| Columbia Strategic Income Fund - Institutional 2 Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Strategic Income Fund |
| Class Name | Institutional 2 Class |
| Trading Symbol | CTIVX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Strategic Income Fund (the Fund) for the period of September 1, 2023 to August 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 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 $ 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 2 Class shares for the period presented is shown in the Average Annual Total Returns table. Top Performance Contributors Duration Allocations Security selection Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Institutional 2 Class 10.88 2.89 3.44 Bloomberg U.S. Aggregate Bond Index 7.30 (0.04 ) 1.64 ICE BofA US Cash Pay High Yield Constrained Index 12.37 4.24 4.55 FTSE Non-U.S. World Government Bond (All Maturities) Index – Unhedged 5.46 (4.10 ) (1.73 ) JPMorgan Emerging Markets Bond Index - Global 12.69 0.76 2.69 |
| 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 |
| Net Assets | $ 5,661,996,222 |
| Holdings Count | Holding | 1,163 |
| Advisory Fees Paid, Amount | $ 29,323,389 |
| Investment Company, Portfolio Turnover | 272% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 1,163 Management services fees $ Portfolio turnover for the reporting period 272% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 52% |
| Holdings [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, 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, S&P and 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 b on Derivative Exposure Long Credit Risk 0.9 % Interest Rate Risk 50.7 % Short Credit Risk 2.2 % Foreign Exchange Risk 0.4 % Interest Rate Risk 70.8 % Asset Categories Credit Quality |
| 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, 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, S&P and 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 b on |
| Updated Prospectus Web Address | columbiathreadneedleus.com/investment-products/mutual-funds |
| Columbia Strategic Income Fund - Institutional 3 Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Strategic Income Fund |
| Class Name | Institutional 3 Class |
| Trading Symbol | CPHUX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Strategic Income Fund (the Fund) for the period of September 1, 2023 to August 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 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 $ 0.60 % |
| Expenses Paid, Amount | $ 63 |
| Expense Ratio, Percent | 0.60% |
| 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 Duration Allocations Security selection Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Institutional 3 Class 10.93 2.93 3.47 Bloomberg U.S. Aggregate Bond Index 7.30 (0.04 ) 1.64 ICE BofA US Cash Pay High Yield Constrained Index 12.37 4.24 4.55 FTSE Non-U.S. World Government Bond (All Maturities) Index – Unhedged 5.46 (4.10 ) (1.73 ) JPMorgan Emerging Markets Bond Index - Global 12.69 0.76 2.69 |
| 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 |
| Net Assets | $ 5,661,996,222 |
| Holdings Count | Holding | 1,163 |
| Advisory Fees Paid, Amount | $ 29,323,389 |
| Investment Company, Portfolio Turnover | 272% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 1,163 Management services fees $ Portfolio turnover for the reporting period 272% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 52% |
| Holdings [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, 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, S&P and 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 f Derivative Exposure Long Credit Risk 0.9 % Interest Rate Risk 50.7 % Short Credit Risk 2.2 % Foreign Exchange Risk 0.4 % Interest Rate Risk 70.8 % Asset Categories Credit Quality |
| 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, 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, S&P and 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 f |
| Updated Prospectus Web Address | columbiathreadneedleus.com/investment-products/mutual-funds |
| Columbia Strategic Income Fund - Class R | |
| Shareholder Report [Line Items] | |
| Fund Name | Columbia Strategic Income Fund |
| Class Name | Class R |
| Trading Symbol | CSNRX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Columbia Strategic Income Fund (the Fund) for the period of September 1, 2023 to August 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 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 Class R $ 1.18 % |
| Expenses Paid, Amount | $ 124 |
| Expense Ratio, Percent | 1.18% |
| 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 Duration Allocations Security selection Security selection |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future performance. |
| Line Graph [Table Text Block] | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns (%) 1 year 5 years 10 years Class R 10.28 2.31 2.86 Bloomberg U.S. Aggregate Bond Index 7.30 (0.04 ) 1.64 ICE BofA US Cash Pay High Yield Constrained Index 12.37 4.24 4.55 FTSE Non-U.S. World Government Bond (All Maturities) Index – Unhedged 5.46 (4.10 ) (1.73 ) JPMorgan Emerging Markets Bond Index - Global 12.69 0.76 2.69 |
| 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 |
| Net Assets | $ 5,661,996,222 |
| Holdings Count | Holding | 1,163 |
| Advisory Fees Paid, Amount | $ 29,323,389 |
| Investment Company, Portfolio Turnover | 272% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 1,163 Management services fees $ Portfolio turnover for the reporting period 272% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 52% |
| Holdings [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, 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, S&P and 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 Derivative Exposure Long Credit Risk 0.9 % Interest Rate Risk 50.7 % Short Credit Risk 2.2 % Foreign Exchange Risk 0.4 % Interest Rate Risk 70.8 % Asset Cat eg Credit Quality |
| 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, 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, S&P and 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 |
| Updated Prospectus Web Address | columbiathreadneedleus.com/investment-products/mutual-funds |
