Bar Chart and Performance Table [Heading]

rr_RiskTextBlock

An investment in the Fund involves risks, including Convertible Securities Risk, Market Risk, Interest Rate Risk, Credit Risk, and Changing Distribution Level Risk, among others. Descriptions of these and other principal risks of investing in the Fund are provided below. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The significance of any specific risk to an

investment in the Fund will vary over time depending on the composition of the Fund's portfolio, market conditions, and other factors. You should read all of the risk information below carefully, because any one or more of these risks may result in losses to the Fund.

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with similar investment objectives and/or strategies.

Changing Distribution Level Risk. The Fund normally expects to receive income which may include interest, dividends and/or capital gains, depending upon its investments. The distribution amounts paid by the Fund will vary and generally depend on the amount of income the Fund earns (less expenses) on its portfolio holdings, and capital gains or losses it recognizes. A decline in the Fund’s income or net capital gains arising from its investments may reduce its distribution level.

Convertible Securities Risk. Convertible securities are subject to the usual risks associated with debt instruments, such as interest rate risk and credit risk. Convertible securities also react to changes in the value of the common stock into which they convert, and are thus subject to market risk. The Fund may also be forced to convert a convertible security at an inopportune time, which may decrease the Fund’s return.

Credit Risk. Credit risk is the risk that the value of debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Credit rating agencies, such as S&P Global Ratings, Moody’s Investors Service, Inc. (Moody’s), Fitch Ratings, Inc. (Fitch), DBRS Morningstar (DBRS) and Kroll Bond Rating Agency, LLC (KBRA), assign credit ratings to certain debt instruments to indicate their credit risk. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower-rated or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Foreign Securities Risk. Investments in or exposure to securities of foreign companies may involve heightened risks relative to investments in or exposure to securities of U.S. companies. Investing in securities of foreign companies subjects the Fund to the risks associated with an issuer’s (and any of its related companies’) country of organization and places of business operations, including risks related to political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations and actions, war, other conflicts, terrorism and disease/virus outbreaks and epidemics) occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities. The performance of the Fund may also be negatively affected by fluctuations in a foreign currency's strength or weakness relative to the U.S. dollar, particularly to the extent the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may

also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Very low or negative interest rates may impact the Fund’s yield and may increase the risk that, if followed by rising interest rates, the Fund’s performance will be negatively impacted. The Fund is subject to the risk that the income generated by its investments may not keep pace with inflation. Actions by governments and central banking authorities can result in increases or decreases in interest rates. Higher periods of inflation could lead such authorities to raise interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly or below expectations, and the value of its securities may therefore decline, which may negatively affect the Fund’s performance. Underperformance of an issuer may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters, military confrontations and actions, war, other conflicts, terrorism, disease/virus outbreaks, epidemics or other events, conditions and factors which may impair the value of an investment in the Fund.

Liquidity Risk. Liquidity risk is the risk associated with any event, circumstance, or characteristic of an investment or market that negatively impacts the Fund’s ability to sell, or realize the proceeds from the sale of, an investment at a desirable time or price. Liquidity risk may arise because of, for example, a lack of marketability of the investment, which means that when seeking to sell its portfolio investments, the Fund could find that selling is more difficult than anticipated, especially during times of high market volatility. Decreases in the number of financial institutions, including banks and broker-dealers, willing to make markets (match up sellers and buyers) in the Fund’s investments or decreases in their capacity or willingness to trade such investments may increase the Fund’s exposure to this risk. The debt market has experienced considerable growth, and financial institutions making markets in instruments purchased and sold by the Fund (e.g., bond dealers) have been subject to increased regulation. The impact of that growth and regulation on the ability and willingness of financial institutions to engage in trading or “making a market” in such instruments remains unsettled. Certain types of investments, such as lower-rated securities or those that are purchased and sold in over-the-counter markets, may be especially subject to liquidity risk. Securities or other assets in which the Fund invests may be traded in the over-the-counter market rather than on an exchange and therefore may be more difficult to purchase or sell at a fair price, which may have a negative impact on the Fund’s performance. Market participants attempting to sell the same or a similar instrument at the same time as the Fund could exacerbate the Fund’s exposure to liquidity risk. The Fund may have to accept a lower selling price for the holding, sell other liquid or more liquid investments that it might otherwise prefer to hold (thereby increasing the proportion of the Fund’s investments in less liquid or illiquid securities), or forego another more appealing investment opportunity. The liquidity of Fund investments may change significantly over time and certain investments that were liquid when purchased by the Fund may later become illiquid, particularly in times of overall economic distress. Changing regulatory, market or other conditions or environments (for example, the interest rate or credit environments) may also adversely affect the liquidity and the price of the Fund's investments. Judgment plays a larger role in valuing illiquid or less liquid investments as compared to valuing liquid or more liquid investments. Price volatility may be higher for illiquid or less liquid investments as a result of, for example, the relatively less frequent pricing of such securities (as compared to liquid or more liquid investments). Generally, the less liquid the market at the time the Fund sells a portfolio investment, the greater the risk of loss or decline of value to the Fund. Overall market liquidity and other factors can lead to an increase in redemptions, which may negatively impact Fund performance and NAV, including, for example, if the Fund is forced to sell investments in a down market.

Market Risk. The Fund may incur losses due to declines in the value of one or more securities in which it invests. These declines may be due to factors affecting a particular issuer, or the result of, among other things, political, regulatory, market, economic or social developments affecting the relevant market(s) more generally. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed income markets may negatively

affect many issuers, which could adversely affect the Fund’s ability to price or value hard-to-value assets in thinly traded and closed markets and could cause significant redemptions and operational challenges. Global economies and financial markets are increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market. These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies worldwide. As a result, local, regional or global events such as terrorism, war, other conflicts, natural disasters, disease/virus outbreaks and epidemics or other public health issues, recessions, depressions or other events – or the potential for such events – could have a significant negative impact on global economic and market conditions.

Preferred Stock Risk. Preferred stock is a type of stock that may pay dividends at a different rate than common stock of the same issuer, if at all, and that has preference over common stock in the payment of dividends and the liquidation of assets. Preferred stock does not ordinarily carry voting rights. The price of a preferred stock is generally determined by earnings, type of products or services, projected growth rates, experience of management, liquidity, and general market conditions of the markets on which the stock trades. The most significant risks associated with investments in preferred stock include issuer risk, market risk and interest rate risk (the risk of losses attributable to changes in interest rates).

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or other asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or other asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Rule 144A and Other Exempted Securities Risk. The Fund may invest in privately placed and other securities or instruments exempt from SEC registration (collectively “private placements”), subject to certain regulatory restrictions. In the U.S. market, private placements are typically sold only to qualified institutional buyers, or qualified purchasers, as applicable. An insufficient number of buyers interested in purchasing private placements at a particular time could adversely affect the marketability of such investments and the Fund might be unable to dispose of them promptly or at reasonable prices, subjecting the Fund to liquidity risk. The Fund’s holdings of private placements may increase the level of Fund illiquidity if eligible buyers are unable or unwilling to purchase them at a particular time. Issuers of Rule 144A eligible securities are required to furnish information to potential investors upon request. However, the required disclosure is much less extensive than that required of public companies and is not publicly available since the offering information is not filed with the SEC. Further, issuers of Rule 144A eligible securities can require recipients of the offering information (such as the Fund) to agree contractually to keep the information confidential, which could also adversely affect the Fund’s ability to dispose of the security.

Sector Risk. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a related group of industries within one or more economic sectors, including the information technology sector. Companies in the same sector may be similarly affected by economic, regulatory, political or market events or conditions, which may make the Fund more vulnerable to unfavorable developments in that group of industries or economic sector than funds that invest more broadly. Generally, the more broadly the Fund invests, the more it spreads risk and potentially reduces the risks of loss and volatility.

■

Information Technology Sector. The Fund is more susceptible to the particular risks that may affect companies in the information technology sector than if it were invested in a wider variety of companies in unrelated sectors. Companies in the information technology sector are subject to certain risks, including the risk that new services, equipment or technologies will not be accepted by consumers and businesses or will become rapidly obsolete. Performance of such companies may be affected by factors including obtaining and protecting patents (or the failure to do so) and significant competitive pressures, including aggressive pricing of their products or services,

new market entrants, competition for market share and short product cycles due to an accelerated rate of technological developments. Such competitive pressures may lead to limited earnings and/or falling profit margins. As a result, the value of their securities may fall or fail to rise. In addition, many information technology sector companies have limited operating histories and prices of these companies’ securities historically have been more volatile than other securities, especially over the short term. Some companies in the information technology sector are facing increased government and regulatory scrutiny and may be subject to adverse government or regulatory action, which could negatively impact the value of their securities.

Short Positions Risk. The Fund may establish short positions which introduce more risk to the Fund than long positions (where the Fund owns the instrument or other asset) because the maximum sustainable loss on an instrument or other asset purchased (held long) is limited to the amount paid for the instrument or other asset plus the transaction costs, whereas there is no maximum price of the shorted instrument or other asset when purchased in the open market. Therefore, in theory, short positions have unlimited risk. The Fund’s use of short positions in effect “leverages” the Fund. Leverage potentially exposes the Fund to greater risks of loss due to unanticipated market movements, which may magnify losses and increase the volatility of returns. To the extent the Fund takes a short position in a derivative instrument or other asset, this involves the risk of a potentially unlimited increase in the value of the underlying instrument or other asset.

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges) for periods prior to its inception date.

Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

columbiathreadneedleus.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Year by Year Total Return (%) as of December 31 Each Year*

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best and Worst Quarterly Returns During the Period Shown in the Bar Chart Best 2nd Quarter 2020 25.95% Worst 2nd Quarter 2022 -16.40%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2022)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Class A shares and will vary for other share classes.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.

Columbia Convertible Securities Fund | Risk Lose Money [Member]

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Risk Not Insured Depository Institution [Member]

rr_RiskTextBlock

There is no assurance that the Fund will achieve its investment objective and you may lose money.

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Active Management Risk [Member]

rr_RiskTextBlock

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Changing Distribution Level Risk [Member]

rr_RiskTextBlock

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with similar investment objectives and/or strategies.

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Convertible Securities Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Credit Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Foreign Securities Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | High Yield Investments Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Interest Rate Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Issuer Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Liquidity Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Market Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Preferred Stock Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Prepayment and Extension Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Rule 144A and Other Exempted Securities Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Sector Risk [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Information Technology Sector [Member]

rr_RiskTextBlock

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Short Positions Risk [Member]

rr_RiskTextBlock

■

rr_RiskReturnAbstract

Columbia Convertible Securities Fund | Class A

rr_RiskTextBlock

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[1]

rr_ManagementFeesOverAssets

0.76%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.13%

rr_ExpensesOverAssets

1.14%

Total annual Fund operating expenses after fee waivers and/or expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[2]

rr_NetExpensesOverAssets

1.08%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

rr_ExpenseExampleYear01

$ 679

rr_ExpenseExampleYear03

911

rr_ExpenseExampleYear05

1,161

rr_ExpenseExampleYear10

1,876

rr_ExpenseExampleNoRedemptionYear01

679

rr_ExpenseExampleNoRedemptionYear03

911

rr_ExpenseExampleNoRedemptionYear05

1,161

Year to Date Return, Label

rr_ExpenseExampleNoRedemptionYear10

$ 1,876

2013

rr_AnnualReturn2013

24.05%

^[3]

2014

rr_AnnualReturn2014

8.44%

^[3]

2015

rr_AnnualReturn2015

(4.58%)

^[3]

2016

rr_AnnualReturn2016

11.23%

^[3]

2017

rr_AnnualReturn2017

15.07%

^[3]

2018

rr_AnnualReturn2018

(1.00%)

^[3]

2019

rr_AnnualReturn2019

26.14%

^[3]

2020

rr_AnnualReturn2020

47.88%

^[3]

2021

rr_AnnualReturn2021

3.87%

^[3]

2022

rr_AnnualReturn2022

(19.62%)

^[3]

rr_YearToDateReturnLabel

Year to Date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2023

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

3.91%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

25.95%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2022

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(16.40%)

rr_AverageAnnualReturnYear01

(24.23%)

rr_AverageAnnualReturnYear05

7.77%

rr_AverageAnnualReturnYear10

9.10%

Columbia Convertible Securities Fund | Class Adv

rr_AverageAnnualReturnInceptionDate

Sep. 25, 1987

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.76%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.13%

rr_ExpensesOverAssets

0.89%

Total annual Fund operating expenses after fee waivers and/or expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[2]

rr_NetExpensesOverAssets

0.83%

rr_ExpenseExampleYear01

$ 85

rr_ExpenseExampleYear03

278

rr_ExpenseExampleYear05

487

rr_ExpenseExampleYear10

1,091

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

278

rr_ExpenseExampleNoRedemptionYear05

487

rr_ExpenseExampleNoRedemptionYear10

$ 1,091

rr_AverageAnnualReturnYear01

(19.41%)

rr_AverageAnnualReturnYear05

9.32%

rr_AverageAnnualReturnYear10

10.02%

Columbia Convertible Securities Fund | Class C

rr_AverageAnnualReturnInceptionDate

Nov. 08, 2012

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[4]

rr_ManagementFeesOverAssets

0.76%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.13%

rr_ExpensesOverAssets

1.89%

Total annual Fund operating expenses after fee waivers and/or expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[2]

rr_NetExpensesOverAssets

1.83%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

rr_ExpenseExampleYear01

$ 286

rr_ExpenseExampleYear03

588

rr_ExpenseExampleYear05

1,016

rr_ExpenseExampleYear10

2,011

rr_ExpenseExampleNoRedemptionYear01

186

rr_ExpenseExampleNoRedemptionYear03

588

rr_ExpenseExampleNoRedemptionYear05

1,016

rr_ExpenseExampleNoRedemptionYear10

$ 2,011

rr_AverageAnnualReturnYear01

(20.98%)

rr_AverageAnnualReturnYear05

8.22%

rr_AverageAnnualReturnYear10

8.92%

Columbia Convertible Securities Fund | Class Inst

rr_AverageAnnualReturnInceptionDate

Oct. 21, 1996

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.76%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.13%

rr_ExpensesOverAssets

0.89%

Total annual Fund operating expenses after fee waivers and/or expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[2]

rr_NetExpensesOverAssets

0.83%

rr_ExpenseExampleYear01

$ 85

rr_ExpenseExampleYear03

278

rr_ExpenseExampleYear05

487

rr_ExpenseExampleYear10

1,091

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

278

rr_ExpenseExampleNoRedemptionYear05

487

rr_ExpenseExampleNoRedemptionYear10

$ 1,091

rr_AverageAnnualReturnYear01

(19.45%)

rr_AverageAnnualReturnYear05

9.31%

rr_AverageAnnualReturnYear10

10.01%

Columbia Convertible Securities Fund | Class Inst2

rr_AverageAnnualReturnInceptionDate

May 21, 1999

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.76%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.09%

rr_ExpensesOverAssets

0.85%

Total annual Fund operating expenses after fee waivers and/or expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.07%)

^[2]

rr_NetExpensesOverAssets

0.78%

rr_ExpenseExampleYear01

$ 80

rr_ExpenseExampleYear03

264

rr_ExpenseExampleYear05

465

rr_ExpenseExampleYear10

1,043

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

264

rr_ExpenseExampleNoRedemptionYear05

465

rr_ExpenseExampleNoRedemptionYear10

$ 1,043

rr_AverageAnnualReturnYear01

(19.39%)

rr_AverageAnnualReturnYear05

9.38%

rr_AverageAnnualReturnYear10

10.11%

Columbia Convertible Securities Fund | Class Inst3

rr_AverageAnnualReturnInceptionDate

Nov. 08, 2012

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.76%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.04%

rr_ExpensesOverAssets

0.80%

Total annual Fund operating expenses after fee waivers and/or expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.07%)

^[2]

rr_NetExpensesOverAssets

0.73%

rr_ExpenseExampleYear01

$ 75

rr_ExpenseExampleYear03

248

rr_ExpenseExampleYear05

437

rr_ExpenseExampleYear10

983

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

248

rr_ExpenseExampleNoRedemptionYear05

437

rr_ExpenseExampleNoRedemptionYear10

$ 983

rr_AverageAnnualReturnYear01

(19.34%)

rr_AverageAnnualReturnYear05

9.43%

rr_AverageAnnualReturnYear10

10.08%

Columbia Convertible Securities Fund | Class R

rr_AverageAnnualReturnInceptionDate

Oct. 01, 2014

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.76%

rr_DistributionAndService12b1FeesOverAssets

0.50%

rr_OtherExpensesOverAssets

0.13%

rr_ExpensesOverAssets

1.39%

Total annual Fund operating expenses after fee waivers and/or expense reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[2]

rr_NetExpensesOverAssets

1.33%

rr_ExpenseExampleYear01

$ 135

rr_ExpenseExampleYear03

434

rr_ExpenseExampleYear05

755

rr_ExpenseExampleYear10

1,663

rr_ExpenseExampleNoRedemptionYear01

135

rr_ExpenseExampleNoRedemptionYear03

434

rr_ExpenseExampleNoRedemptionYear05

755

rr_ExpenseExampleNoRedemptionYear10

$ 1,663

rr_AverageAnnualReturnYear01

(19.84%)

rr_AverageAnnualReturnYear05

8.77%

rr_AverageAnnualReturnYear10

9.47%

Columbia Convertible Securities Fund | returns after taxes on distributions | Class A

rr_AverageAnnualReturnInceptionDate

Nov. 16, 2011

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

(26.06%)

rr_AverageAnnualReturnYear05

4.84%

rr_AverageAnnualReturnYear10

6.83%

Columbia Convertible Securities Fund | returns after taxes on distributions and sale of Fund shares | Class A

rr_AverageAnnualReturnInceptionDate

Sep. 25, 1987

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

(13.36%)

rr_AverageAnnualReturnYear05

5.69%

rr_AverageAnnualReturnYear10

6.81%

Columbia Convertible Securities Fund | ICE BofA US Convertible Index (reflects no deductions for fees, expenses, taxes or, for periods prior to July 2022, transaction costs)

rr_AverageAnnualReturnInceptionDate

Sep. 25, 1987

rr_RiskReturnAbstract

rr_AverageAnnualReturnYear01

(18.71%)

rr_AverageAnnualReturnYear05

9.29%