| Form N-CSR Cover | 6 Months Ended |
| Nov. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| 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 | Nov. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Nov. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| 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 | Nov. 30, 2024 | |
| Columbia Mortgage Opportunities Fund - Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Columbia Mortgage Opportunities Fund | |
| Class Name | Class A | |
| Trading Symbol | CLMAX | |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature | |
| 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 $ 1.10 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 57 | |
| Expense Ratio, Percent | 1.10% | [1] |
| Net Assets | $ 2,357,891,654 | |
| Holdings Count | Holding | 432 | |
| Investment Company, Portfolio Turnover | 352% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 432 Portfolio turnover for the reporting period 352% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 11% | |
| 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 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. Derivative Exposure Long Credit Risk 3.1 % Interest Rate Risk 125.2 % Short Credit Risk 7.8 % Interest Rate Risk 198.0 % 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 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. | |
| Columbia Mortgage Opportunities Fund - Class C | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Columbia Mortgage Opportunities Fund | |
| Class Name | Class C | |
| Trading Symbol | CLMCX | |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report | |
| Shareholder Report Annual or Semi-Annual | semi-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 $ 1.85 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 96 | |
| Expense Ratio, Percent | 1.85% | [1] |
| Net Assets | $ 2,357,891,654 | |
| Holdings Count | Holding | 432 | |
| Investment Company, Portfolio Turnover | 352% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 432 Portfolio turnover for the reporting period 352% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 11% | |
| 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 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. Derivative Exposure Long Credit Risk 3.1 % Interest Rate Risk 125.2 % Short Credit Risk 7.8 % Interest Rate Risk 198.0 % 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 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. | |
| Columbia Mortgage Opportunities Fund - Institutional Class | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Columbia Mortgage Opportunities Fund | |
| Class Name | Institutional Class | |
| Trading Symbol | CLMZX | |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report | |
| Shareholder Report Annual or Semi-Annual | semi-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 $ 0.85 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 44 | |
| Expense Ratio, Percent | 0.85% | [1] |
| Net Assets | $ 2,357,891,654 | |
| Holdings Count | Holding | 432 | |
| Investment Company, Portfolio Turnover | 352% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 432 Portfolio turnover for the reporting period 352% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 11% | |
| Holdings [Text Block] | Graphical Representation of Fund The tables below show the investment makeup of the Fund represented 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. Derivative Exposure Long Credit Risk 3.1 % Interest Rate Risk 125.2 % Short Credit Risk 7.8 % Interest Rate Risk 198.0 % 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 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. | |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Columbia Mortgage Opportunities Fund | |
| Class Name | Institutional 2 Class | |
| Trading Symbol | CLMVX | |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report | |
| Shareholder Report Annual or Semi-Annual | semi-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 $ 0.80 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 42 | |
| Expense Ratio, Percent | 0.80% | [1] |
| Net Assets | $ 2,357,891,654 | |
| Holdings Count | Holding | 432 | |
| Investment Company, Portfolio Turnover | 352% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 432 Portfolio turnover for the reporting period 352% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 11% | |
| 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 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. Derivative Exposure Long Credit Risk 3.1 % Interest Rate Risk 125.2 % Short Credit Risk 7.8 % Interest Rate Risk 198.0 % 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 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. | |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Columbia Mortgage Opportunities Fund | |
| Class Name | Institutional 3 Class | |
| Trading Symbol | CMOYX | |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report | |
| Shareholder Report Annual or Semi-Annual | semi-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 $ 0.76 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 40 | |
| Expense Ratio, Percent | 0.76% | [1] |
| Net Assets | $ 2,357,891,654 | |
| Holdings Count | Holding | 432 | |
| Investment Company, Portfolio Turnover | 352% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Fund net assets $ Total number of portfolio holdings 432 Portfolio turnover for the reporting period 352% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 11% | |
| 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 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. Derivative Exposure Long Credit Risk 3.1 % Interest Rate Risk 125.2 % Short Credit Risk 7.8 % Interest Rate Risk 198.0 % 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 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. | |
| Columbia Mortgage Opportunities Fund - Class S | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Columbia Mortgage Opportunities Fund | |
| Class Name | Class S | |
| Trading Symbol | CLMDX | |
| Annual or Semi-Annual Statement [Text Block] | This semiannual shareholder report | |
| Shareholder Report Annual or Semi-Annual | semi-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 S $ (a) 0.87 % (b) (a) Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher. (b) Annualized. | |
| Expenses Paid, Amount | $ 13 | [1] |
| Expense Ratio, Percent | 0.87% | [2] |
| Net Assets | $ 2,357,891,654 | |
| Holdings Count | Holding | 432 | |
| Investment Company, Portfolio Turnover | 352% | |
| Additional Fund Statistics [Text Block] | Key Fund Statis Fund net assets $ Total number of portfolio holdings 432 Portfolio turnover for the reporting period 352% Portfolio turnover for the reporting period excluding to be announced (TBA) securities 11% | |
| 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 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. Deriv ativ Long Credit Risk 3.1 % Interest Rate Risk 125.2 % Short Credit Risk 7.8 % Interest Rate Risk 198.0 % 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 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. | |
| [1]Annualized.[2]Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher. | ||
| Shareholder Report, Holdings (Details) | Nov. 30, 2024 |
| Columbia Mortgage Opportunities Fund - Class A | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 132.40% |
| Columbia Mortgage Opportunities Fund - Class A | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Columbia Mortgage Opportunities Fund - Class A | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Columbia Mortgage Opportunities Fund - Class A | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Columbia Mortgage Opportunities Fund - Class A | B rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Columbia Mortgage Opportunities Fund - Class A | CCC rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Columbia Mortgage Opportunities Fund - Class A | C rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Mortgage Opportunities Fund - Class A | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Columbia Mortgage Opportunities Fund - Class A | Residential Mortgage-Backed Securities - Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.40% |
| Columbia Mortgage Opportunities Fund - Class A | Residential Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.30% |
| Columbia Mortgage Opportunities Fund - Class A | Asset-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Columbia Mortgage Opportunities Fund - Class A | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Columbia Mortgage Opportunities Fund - Class A | Commercial Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Mortgage Opportunities Fund - Class A | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Mortgage Opportunities Fund - Class A | Long Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Columbia Mortgage Opportunities Fund - Class A | Long Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.20% |
| Columbia Mortgage Opportunities Fund - Class A | Short Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Columbia Mortgage Opportunities Fund - Class A | Short Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 198% |
| Columbia Mortgage Opportunities Fund - Class C | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 132.40% |
| Columbia Mortgage Opportunities Fund - Class C | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Columbia Mortgage Opportunities Fund - Class C | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Columbia Mortgage Opportunities Fund - Class C | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Columbia Mortgage Opportunities Fund - Class C | B rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Columbia Mortgage Opportunities Fund - Class C | CCC rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Columbia Mortgage Opportunities Fund - Class C | C rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Mortgage Opportunities Fund - Class C | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Columbia Mortgage Opportunities Fund - Class C | Residential Mortgage-Backed Securities - Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.40% |
| Columbia Mortgage Opportunities Fund - Class C | Residential Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.30% |
| Columbia Mortgage Opportunities Fund - Class C | Asset-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Columbia Mortgage Opportunities Fund - Class C | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Columbia Mortgage Opportunities Fund - Class C | Commercial Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Mortgage Opportunities Fund - Class C | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Mortgage Opportunities Fund - Class C | Long Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Columbia Mortgage Opportunities Fund - Class C | Long Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.20% |
| Columbia Mortgage Opportunities Fund - Class C | Short Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Columbia Mortgage Opportunities Fund - Class C | Short Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 198% |
| Columbia Mortgage Opportunities Fund - Institutional Class | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 132.40% |
| Columbia Mortgage Opportunities Fund - Institutional Class | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Columbia Mortgage Opportunities Fund - Institutional Class | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Columbia Mortgage Opportunities Fund - Institutional Class | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Columbia Mortgage Opportunities Fund - Institutional Class | B rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Columbia Mortgage Opportunities Fund - Institutional Class | CCC rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Columbia Mortgage Opportunities Fund - Institutional Class | C rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Residential Mortgage-Backed Securities - Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.40% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Residential Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.30% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Asset-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Commercial Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Long Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Long Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.20% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Short Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Columbia Mortgage Opportunities Fund - Institutional Class | Short Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 198% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 132.40% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | B rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | CCC rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | C rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Residential Mortgage-Backed Securities - Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.40% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Residential Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.30% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Asset-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Commercial Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Long Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Long Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.20% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Short Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Columbia Mortgage Opportunities Fund - Institutional 2 Class | Short Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 198% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 132.40% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | B rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | CCC rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | C rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Residential Mortgage-Backed Securities - Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.40% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Residential Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.30% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Asset-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Commercial Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Long Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Long Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.20% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Short Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Columbia Mortgage Opportunities Fund - Institutional 3 Class | Short Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 198% |
| Columbia Mortgage Opportunities Fund - Class S | AA rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 132.40% |
| Columbia Mortgage Opportunities Fund - Class S | A rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Columbia Mortgage Opportunities Fund - Class S | BBB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Columbia Mortgage Opportunities Fund - Class S | BB rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Columbia Mortgage Opportunities Fund - Class S | B rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Columbia Mortgage Opportunities Fund - Class S | CCC rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Columbia Mortgage Opportunities Fund - Class S | C rating [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Columbia Mortgage Opportunities Fund - Class S | Not rated [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Columbia Mortgage Opportunities Fund - Class S | Residential Mortgage-Backed Securities - Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.40% |
| Columbia Mortgage Opportunities Fund - Class S | Residential Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 46.30% |
| Columbia Mortgage Opportunities Fund - Class S | Asset-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Columbia Mortgage Opportunities Fund - Class S | Money Market Fund [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Columbia Mortgage Opportunities Fund - Class S | Commercial Mortgage-Backed Securities - Non-Agency [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Columbia Mortgage Opportunities Fund - Class S | Other [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Columbia Mortgage Opportunities Fund - Class S | Long Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Columbia Mortgage Opportunities Fund - Class S | Long Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 125.20% |
| Columbia Mortgage Opportunities Fund - Class S | Short Credit Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Columbia Mortgage Opportunities Fund - Class S | Short Interest Rate Risk [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 198% |
