Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	COLUMBIA FUNDS SERIES TRUST I
Prospectus Date	rr_ProspectusDate	Mar. 01, 2015
Columbia Strategic Income Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Strategic Income Fund (the Fund) seeks total return, consisting of current income and capital appreciation.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information about these and other discounts is available from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 29 of the Fund’s prospectus and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 124% (77% excluding mortgage dollar rolls) of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	124.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information about these and other discounts is available from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 29 of the Fund’s prospectus and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Other expenses for Class A, Class B, Class C, Class K, Class R, Class R4, Class R5, Class W and Class Z shares have been restated to reflect current fees paid by the Fund.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that: you invest $10,000 in the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund has substantial exposure to fixed income/debt markets. The Fund has the flexibility to invest in any sector of the fixed income market and across the credit quality spectrum. The Fund may invest in U.S. Government bonds and notes (including those of its agencies and instrumentalities, and of government-sponsored enterprises), U.S. and international (including developed, developing and emerging markets) bonds and notes, investment grade corporate (or similar) bonds and notes, mortgage- and other asset-backed securities, high yield (i.e., junk) instruments, floating rate loans and other floating rate debt securities, inflation-protected/linked securities, convertible securities, cash/cash equivalents, as well as foreign government, sovereign and quasi-sovereign debt investments. The Fund’s investments may include non-U.S. dollar denominated instruments. The Fund may also invest in preferred securities. The Fund does not seek to maintain a particular dollar-weighted average maturity or duration target. The Fund may invest in derivatives, such as forward foreign currency contracts for investment and hedging purposes; futures (including bond futures for managing yield curve); swaps (including credit default swaps, credit default swap indexes and interest rate swaps for hedging purposes, and total return swaps for investment purposes); options (including options on listed futures for hedging purposes); and interest-only (IO) and principal-only (PO) bonds for investment purposes. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis. Such securities may include mortgage-backed securities acquired or sold in the “to be announced” (TBA) market and those in a dollar roll transaction. The Fund also may invest in private placements.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the Fund involves risk, including those described 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. Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with similar investment objectives. Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received by the Fund on the securities it holds. The Fund may not be able to pay distributions or may have to reduce its distribution level if the interest income and/or dividends the Fund receives from its investments decline. Convertible Securities Risk. Convertible securities are subject to the usual risks associated with debt securities, 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. The value of loans or fixed-income securities may decline if the borrower or the issuer of the security 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. Rating agencies assign credit ratings to certain loans and fixed-income securities to indicate their credit risk. Lower quality or unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities. Non-investment grade loans or fixed-income securities (commonly called “high-yield” or “junk”) are subject to greater price fluctuations and are more likely to experience a default than investment grade loans or securities and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated loans or securities, or if the ratings of loans or securities held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. If the issuer of a loan declares bankruptcy or is declared bankrupt, there may be a delay before the Fund can act on the collateral securing the loan, which may adversely affect the Fund. Further, there is a risk that a court could take action with respect to a loan that is adverse to the holders of the loan. Such actions may include invalidating the loan, the lien on the collateral, the priority status of the loan, or ordering the refund of interest previously paid by the borrower. Any such actions by a court could adversely affect the Fund’s performance. A default or expected default of a loan could also make it difficult for the Fund to sell the loan at a price approximating the value previously placed on it. In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel. This may increase the Fund’s operating expenses and adversely affect its NAV. Loans that have a lower priority for repayment in an issuer’s capital structure may involve a higher degree of overall risk than more senior loans of the same borrower. Derivatives Risk. Losses involving derivative instruments may be substantial, because a relatively small movement in the price of an underlying security, instrument, commodity, currency or index may result in a substantial loss for the Fund. In addition to the potential for increased losses, the use of derivative instruments may lead to increased volatility for the Fund. Derivative investments will typically increase the Fund’s exposure to principal risks to which it is otherwise exposed, and may expose the Fund to additional risks, including correlation risk, counterparty risk, hedging risk, leverage risk and/or liquidity risk. Derivatives Risk/Credit Default Swap Indexes Risk. A credit default swap (CDS) is an agreement between two parties in which one party agrees to make one or more payments to the second party, while the second party assumes the risk of certain defaults, generally a failure to pay on a referenced debt obligation or the bankruptcy of the obligation’s issuer. As such, a CDS generally enables an investor to buy or sell protection against a credit event. A credit default index (CDX) is an index of CDS. Credit default swap indexes (CDSX) are swap agreements that are intended to track the performance of a CDX. CDSX allow an investor, such as the Fund, to manage credit risk or to take a position on a basket of debt obligations more efficiently than transacting in single name CDS. CDSX are subject to the risk that the Fund’s counterparty will default on its obligations. If the counterparty under a CDSX defaults on its obligation to make payments thereunder, the Fund may lose such payments altogether, or collect only a portion thereof, which collection could involve costs or delays. Also, the Fund’s return from investment in CDSX may not match the return of the referenced index. Further, investment in CDSX could result in losses if the referenced index does not perform as expected. Unexpected changes in the composition of the index may also affect performance of CDSX. Derivatives Risk/Credit Default Swaps Risk. A credit default swap enables an investor to buy or sell protection against a credit event, such as an issuer’s failure to make timely payments of interest or principal, bankruptcy or restructuring. A credit default swap may be embedded within a structured note or other derivative instrument. Swaps can involve greater risks than direct investment in the underlying securities, because swaps, among other factors, may be leveraged (creating leverage risk, the risk that losses from the derivative instrument may be greater than the amount invested in the derivative instrument) and subject the Fund to counterparty risk, hedging risk, pricing risk and liquidity risk. If the Fund is selling credit protection, there is a risk that a credit event will occur and that the Fund will have to pay the counterparty. If the Fund is buying credit protection, there is a risk that no credit event will occur and the Fund will receive no benefit for the premium paid. Derivatives Risk/Forward Foreign Currency Contracts Risk. These instruments are a type of derivative contract whereby the Fund may agree to buy or sell a country’s or region’s currency at a specific price on a specific date in the future. These instruments may fall in value (sometimes dramatically) due to foreign market downswings or foreign currency value fluctuations, subjecting the Fund to foreign currency risk. Investment in these instruments also subjects the Fund to counterparty risk. The Fund’s strategy of investing in these instruments may not be successful and the Fund may experience significant losses as a result. Derivatives Risk/Futures Contracts Risk. The loss that may be incurred in entering into futures contracts may exceed the amount of the premium paid and may be potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s NAV. Additionally, as a result of the low collateral deposits normally involved in futures trading, a relatively small price movement in a futures contract may result in substantial losses for the Fund. Futures contracts may be illiquid. Furthermore, exchanges may limit fluctuations in futures contract prices during a trading session by imposing a maximum permissible price movement on each futures contract. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. Futures contracts executed on foreign exchanges may not provide the same protection as U.S. exchanges. These transactions involve additional risks, including counterparty risk, hedging risk and pricing risk. Derivatives Risk/Interest Rate Swaps Risk. Interest rate swaps can be based on various measures of interest rates, including the London Interbank Offered Rate (commonly known as LIBOR), swap rates, treasury rates and other foreign interest rates. A swap agreement can increase or decrease the volatility of the Fund's investments and its NAV. The value of swaps, like many other derivatives, may move in unexpected ways and may result in losses for the Fund. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged, and are, among other factors, subject to counterparty risk (the risk that the counterparty to the instrument will not perform or be able to perform in accordance with the terms of the instrument), hedging and correlation risk (the risk that a hedging strategy may not eliminate the risk that it is intended to offset, and may offset gains, including because of a lack of correlation between the swaps and the portfolio of bonds that the swaps are designed to hedge or replace), pricing risk (swaps may be difficult to value), liquidity risk (it may not be possible to liquidate a swap position at an advantageous time or price) and interest rate risk (the risk of losses attributable to changes in interest rates), each of which may result in significant losses for the Fund. Derivatives Risk/Options Risk. The use of options is a highly specialized activity which involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. If the Fund sells a put option, there is a risk that the Fund may be required to buy the underlying asset at a disadvantageous price. If the Fund sells a call option, there is a risk that the Fund may be required to sell the underlying asset at a disadvantageous price, and if the call option sold is not covered (for example, by owning the underlying asset), the Fund's losses are potentially unlimited. These transactions involve other risks, including counterparty risk and hedging risk. Derivatives Risk/Swaps Risk. The use of swaps is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. Swaps could result in Fund losses if the underlying asset or reference does not perform as anticipated. The value of swaps, like many other derivatives, may move in unexpected ways and may result in losses for the Fund. Such transactions can have the potential for unlimited losses. Such risk is heightened in the case of short swap transactions involving short exposures. Swaps can involve greater risks than direct investment in the underlying asset, because swaps may be leveraged (creating leverage risk) and are subject to counterparty risk, hedging risk, pricing risk and liquidity risk. Derivatives Risk/Total Return Swaps Risk. In a total return swap transaction, one party agrees to pay the other party an amount equal to the total return of a defined underlying asset (such as an equity security or basket of such securities) or a non-asset reference (such as an index) during a specified period of time. In return, the other party would make periodic payments based on a fixed or variable interest rate or on the total return from a different underlying asset or non-asset reference. Total return swaps could result in Fund losses if the underlying asset or reference does not perform as anticipated. Such transactions can have the potential for unlimited losses. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged (creating leverage risk), and are subject to counterparty risk, pricing risk and liquidity risk, which may result in significant Fund losses. Emerging Market Securities Risk. Securities issued by foreign governments or companies in emerging market countries, such as China, Russia and certain countries in Eastern Europe, the Middle East, Asia, Latin America or Africa, are more likely to have greater exposure to the risks of investing in foreign securities that are described in Foreign Securities Risk. In addition, emerging market countries are more likely to experience instability resulting, for example, from rapid changes or developments in social, political, economic or other conditions. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity (i.e., lower trading volumes and less liquidity) than more developed countries. Emerging market securities tend to be more volatile than securities in more developed markets. Many emerging market countries are heavily dependent on international trade and have fewer trading partners, which makes them more sensitive to world commodity prices and economic downturns in other countries, and some have a higher risk of currency devaluations. Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including the political, regulatory, economic, social, diplomatic and other conditions or events 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. The performance of the Fund may be negatively impacted by fluctuations in a foreign currency’s strength or weakness relative to the U.S. dollar, particularly if the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar. Forward Commitments on Mortgage-backed Securities (including Dollar Rolls) Risk. When purchasing mortgage-backed securities in the “to be announced” (TBA) market (MBS TBAs), the seller agrees to deliver mortgage-backed securities for an agreed upon price on an agreed upon date, but may make no guarantee as to the specific securities to be delivered. In lieu of taking delivery of mortgage-backed securities, the Fund could enter into dollar rolls, which are transactions in which the Fund sells securities to a counterparty and simultaneously agrees to purchase those or similar securities in the future at a predetermined price. Dollar rolls involve the risk that the market value of the securities the Fund is obligated to repurchase may decline below the repurchase price, or that the counterparty may default on its obligations. These transactions may also increase the Fund’s portfolio turnover rate. If the Fund reinvests the proceeds of the security sold, the Fund will also be subject to the risk that the investments purchased with such proceeds will decline in value (a form of leverage risk). MBS TBAs and dollar rolls are subject to counterparty risk. High-Yield Securities Risk. Securities rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated securities 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 securities. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated securities. High-yield securities are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal. Impairment of Collateral Risk. The value of collateral, if any, securing a loan can decline, and may be insufficient to meet the borrower’s obligations or difficult or costly to liquidate. In addition, the Fund’s access to collateral may be limited by bankruptcy or other insolvency laws. Further, certain floating rate and other loans may not be fully collateralized and may decline in value. Inflation-Protected Securities Risk. Inflation-protected debt securities tend to react to changes in real interest rates (i.e., nominal interest rates minus the expected impact of inflation). In general, the price of such securities falls when real interest rates rise, and rises when real interest rates fall. Interest payments on these securities will vary and may be more volatile than interest paid on ordinary bonds. In periods of deflation, the Fund may have no income at all from such investments. Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities tend to fall, and if interest rates fall, the values of debt securities tend to rise. Changes in the value of a debt security usually will not affect the amount of income the Fund receives from it but will usually affect the value of the Fund's shares. In general, the longer the maturity or duration of a debt security, 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. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of fixed-income securities held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Securities with floating coupon rates are typically less sensitive to interest rate changes, but these securities may decline in value if their coupon rates do not rise as much as, or keep pace with, yields on such types of securities. Because rates on certain floating rate loans and other debt securities reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause fluctuations in the Fund’s NAV. Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance 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 or other events, conditions or factors. Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. Decreases in the number of financial institutions willing to make markets in the Fund’s investments or in their capacity or willingness to trade such investments may increase the Fund’s exposure to this risk. Changing regulatory, market or other conditions or environments (for example, the interest rate or credit environments) may also adversely affect the liquidity of the Fund's investments. The Fund may have to accept a lower selling price for the holding, sell other investments, or forego another, more appealing investment opportunity. Floating rate loans generally are subject to legal or contractual restrictions on resale, may trade infrequently, and their value may be impaired when the Fund needs to liquidate such loans. Loans or other assets may trade only in the over-the-counter market rather than on an organized exchange and may be more difficult to purchase or sell at a fair price, which may have a negative impact on the Fund’s performance. Price volatility may be higher for illiquid investments as a result of, for example, the relatively less frequent pricing of such securities (as compared to 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. Price volatility, liquidity of the market and other factors can lead to an increase in Fund redemptions, which may negatively impact Fund performance and NAV, including, for example, if the Fund is forced to sell securities in a down market. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Under certain market conditions, debt securities may have greater price volatility than equity securities. An investment in the Fund could lose money over short or even long periods. Mortgage- and Other Asset-Backed Securities Risk. The value of any mortgage-backed and other asset-backed securities held by the Fund may be affected by, among other things, changes or perceived changes in: interest rates; factors concerning the interests in and structure of the issuer or the originator of the mortgages or other assets; the creditworthiness of the entities that provide any supporting letters of credit, surety bonds or other credit enhancements; or the market's assessment of the quality of underlying assets. Payment of principal and interest on some mortgage-backed securities (but not the market value of the securities themselves) may be guaranteed by the full faith and credit of a particular U.S. Government agency, authority, enterprise or instrumentality, and some, but not all, are also insured or guaranteed by the U.S. Government. Mortgage-backed securities issued by non-governmental issuers (such as commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers) may entail greater risk than obligations guaranteed by the U.S. Government. Mortgage- and other asset-backed securities are subject to prepayment risk, which is the possibility that the underlying mortgage or other asset may be refinanced or prepaid prior to maturity during periods of declining or low interest rates, causing the Fund to have to reinvest the money received in securities that have lower yields. Rising or high interest rates tend to extend the duration of mortgage- and other asset-backed securities, making their prices more volatile and more sensitive to changes in interest rates. Preferred Stock Risk. Preferred stock is a type of stock that generally pays dividends at a specified rate 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 (i.e., the risk of losses attributable to changes in interest rates). Prepayment and Extension Risk. Prepayment and extension risk is the risk that a loan, 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, the investment might not be called as expected, and 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 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 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. Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning. Rule 144A Securities Risk. The Fund may invest significantly in privately placed “Rule 144A” securities that are determined to be liquid in accordance with procedures adopted by the Fund’s Board. However, an insufficient number of qualified institutional buyers interested in purchasing Rule 144A securities at a particular time could affect adversely the marketability of such securities and the Fund might be unable to dispose of such securities promptly or at reasonable prices. Accordingly, even if determined to be liquid, the Fund’s holdings of Rule 144A securities may increase the level of Fund illiquidity if eligible buyers become uninterested in buying them at a particular time. Issuers of Rule 144A 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 it is not filed with the SEC. Further, issuers of Rule 144A securities can require recipients of the 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. Sovereign Debt Risk. A sovereign debtor’s willingness or ability to repay principal and pay interest in a timely manner may be affected by a variety of factors, including its cash flow situation, the extent of its reserves, the availability of sufficient foreign exchange on the date a payment is due, the relative size of the debt service burden to the economy as a whole, the sovereign debtor’s policy toward international lenders, and the political constraints to which a sovereign debtor may be subject. Sovereign debt risk is increased for emerging market issuers. Stripped Securities Risk. Stripped securities are the separate income or principal components of debt securities. These securities are particularly sensitive to changes in interest rates, and therefore subject to greater fluctuations in price than typical interest bearing debt securities. U.S. Government Obligations Risk. While U.S. Treasury obligations are backed by the “full faith and credit” of the U.S. Government, such securities are nonetheless subject to credit risk (i.e., the risk that the U.S. Government may be, or be perceived to be, unable or unwilling to honor its financial obligations, such as making payments). Securities issued or guaranteed by federal agencies or authorities and U.S. Government-sponsored instrumentalities or enterprises may or may not be backed by the full faith and credit of the U.S. Government.
Risk Lose Money [Text]	rr_RiskLoseMoney	There is no assurance that the Fund will achieve its investment objective and you may lose money.
Bar Chart and Performance Table [Heading]	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, as well as one or more other measures of performance for markets in which the Fund may invest. 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 and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) 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 Fund’s performance prior to August 29, 2014 reflects returns achieved pursuant to different principal investment strategies. 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 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-deferred 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 columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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, as well as one or more other measures of performance for markets in which the Fund may invest.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.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                            3rd Quarter 2009                            7.71% Worst                         4th Quarter 2008                           -3.89%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2014)
Performance Table Market Index Changed	rr_PerformanceTableMarketIndexChanged	Effective at the close of business on August 29, 2014, the Fund compares its performance to that of the Barclays U.S. Aggregate Bond Index (the New Index), as well as, for additional comparison purposes with respect to markets in which the Fund may invest, the three indices appearing in the table immediately following the New Index. Prior to then, the Fund compared its performance against the Blended Benchmark and the Barclays U.S. Government/Credit Bond Index (the Former Benchmarks). The Fund’s investment manager made this recommendation to the Fund’s Board of Trustees because the investment manager believes that, in particular, the New Index provides a more appropriate basis for comparing the Fund's performance in light of the changes made to the Fund's principal investment strategies. Information on the Former Benchmarks will be included for a one-year transition period.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	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 and do not reflect the impact of state, local or foreign taxes.
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-deferred 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.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	Effective at the close of business on August 29, 2014, the Fund compares its performance to that of the Barclays U.S. Aggregate Bond Index (the New Index), as well as, for additional comparison purposes with respect to markets in which the Fund may invest, the three indices appearing in the table immediately following the New Index. Prior to then, the Fund compared its performance against the Blended Benchmark and the Barclays U.S. Government/Credit Bond Index (the Former Benchmarks). The Fund’s investment manager made this recommendation to the Fund’s Board of Trustees because the investment manager believes that, in particular, the New Index provides a more appropriate basis for comparing the Fund's performance in light of the changes made to the Fund's principal investment strategies. Information on the Former Benchmarks will be included for a one-year transition period.
Columbia Strategic Income Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.75%
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]
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.05%
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.
1 year	rr_ExpenseExampleYear01	577
3 years	rr_ExpenseExampleYear03	793
5 years	rr_ExpenseExampleYear05	1,027
10 years	rr_ExpenseExampleYear10	1,697
1 year	rr_ExpenseExampleNoRedemptionYear01	577
3 years	rr_ExpenseExampleNoRedemptionYear03	793
5 years	rr_ExpenseExampleNoRedemptionYear05	1,027
10 years	rr_ExpenseExampleNoRedemptionYear10	1,697
2005	rr_AnnualReturn2005	1.26%
2006	rr_AnnualReturn2006	6.76%
2007	rr_AnnualReturn2007	5.67%
2008	rr_AnnualReturn2008	(6.46%)
2009	rr_AnnualReturn2009	18.67%
2010	rr_AnnualReturn2010	9.96%
2011	rr_AnnualReturn2011	6.11%
2012	rr_AnnualReturn2012	11.60%
2013	rr_AnnualReturn2013	0.07%
2014	rr_AnnualReturn2014	3.67%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	7.71%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.89%)
1 Year	rr_AverageAnnualReturnYear01	(1.27%)
5 Years	rr_AverageAnnualReturnYear05	5.18%
10 Years	rr_AverageAnnualReturnYear10	5.01%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 21, 1977
Columbia Strategic Income Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.80%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	This charge decreases over time.
1 year	rr_ExpenseExampleYear01	683
3 years	rr_ExpenseExampleYear03	866
5 years	rr_ExpenseExampleYear05	1,175
10 years	rr_ExpenseExampleYear10	1,919
1 year	rr_ExpenseExampleNoRedemptionYear01	183
3 years	rr_ExpenseExampleNoRedemptionYear03	566
5 years	rr_ExpenseExampleNoRedemptionYear05	975
10 years	rr_ExpenseExampleNoRedemptionYear10	1,919
1 Year	rr_AverageAnnualReturnYear01	(2.00%)
5 Years	rr_AverageAnnualReturnYear05	5.08%
10 Years	rr_AverageAnnualReturnYear10	4.76%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	May 15, 1992
Columbia Strategic Income Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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]
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.80%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	This charge applies to redemptions within one year after purchase, with certain limited exceptions.
1 year	rr_ExpenseExampleYear01	283
3 years	rr_ExpenseExampleYear03	566
5 years	rr_ExpenseExampleYear05	975
10 years	rr_ExpenseExampleYear10	2,116
1 year	rr_ExpenseExampleNoRedemptionYear01	183
3 years	rr_ExpenseExampleNoRedemptionYear03	566
5 years	rr_ExpenseExampleNoRedemptionYear05	975
10 years	rr_ExpenseExampleNoRedemptionYear10	2,116
1 Year	rr_AverageAnnualReturnYear01	2.05%
5 Years	rr_AverageAnnualReturnYear05	5.52%
10 Years	rr_AverageAnnualReturnYear10	4.89%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 01, 1997
Columbia Strategic Income Fund | Class K
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.40%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.92%
1 year	rr_ExpenseExampleYear01	94
3 years	rr_ExpenseExampleYear03	293
5 years	rr_ExpenseExampleYear05	509
10 years	rr_ExpenseExampleYear10	1,131
1 year	rr_ExpenseExampleNoRedemptionYear01	94
3 years	rr_ExpenseExampleNoRedemptionYear03	293
5 years	rr_ExpenseExampleNoRedemptionYear05	509
10 years	rr_ExpenseExampleNoRedemptionYear10	1,131
1 Year	rr_AverageAnnualReturnYear01	3.67%
5 Years	rr_AverageAnnualReturnYear05	6.27%
10 Years	rr_AverageAnnualReturnYear10	5.56%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 07, 2011
Columbia Strategic Income Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.30%
1 year	rr_ExpenseExampleYear01	132
3 years	rr_ExpenseExampleYear03	412
5 years	rr_ExpenseExampleYear05	713
10 years	rr_ExpenseExampleYear10	1,568
1 year	rr_ExpenseExampleNoRedemptionYear01	132
3 years	rr_ExpenseExampleNoRedemptionYear03	412
5 years	rr_ExpenseExampleNoRedemptionYear05	713
10 years	rr_ExpenseExampleNoRedemptionYear10	1,568
1 Year	rr_AverageAnnualReturnYear01	3.39%
5 Years	rr_AverageAnnualReturnYear05	6.03%
10 Years	rr_AverageAnnualReturnYear10	5.31%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Strategic Income Fund | Class R4
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.80%
1 year	rr_ExpenseExampleYear01	82
3 years	rr_ExpenseExampleYear03	255
5 years	rr_ExpenseExampleYear05	444
10 years	rr_ExpenseExampleYear10	990
1 year	rr_ExpenseExampleNoRedemptionYear01	82
3 years	rr_ExpenseExampleNoRedemptionYear03	255
5 years	rr_ExpenseExampleNoRedemptionYear05	444
10 years	rr_ExpenseExampleNoRedemptionYear10	990
1 Year	rr_AverageAnnualReturnYear01	3.98%
5 Years	rr_AverageAnnualReturnYear05	6.30%
10 Years	rr_AverageAnnualReturnYear10	5.58%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 08, 2012
Columbia Strategic Income Fund | Class R5
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.15%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.67%
1 year	rr_ExpenseExampleYear01	68
3 years	rr_ExpenseExampleYear03	214
5 years	rr_ExpenseExampleYear05	373
10 years	rr_ExpenseExampleYear10	835
1 year	rr_ExpenseExampleNoRedemptionYear01	68
3 years	rr_ExpenseExampleNoRedemptionYear03	214
5 years	rr_ExpenseExampleNoRedemptionYear05	373
10 years	rr_ExpenseExampleNoRedemptionYear10	835
1 Year	rr_AverageAnnualReturnYear01	4.11%
5 Years	rr_AverageAnnualReturnYear05	6.51%
10 Years	rr_AverageAnnualReturnYear10	5.68%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 07, 2011
Columbia Strategic Income Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.05%
1 year	rr_ExpenseExampleYear01	107
3 years	rr_ExpenseExampleYear03	334
5 years	rr_ExpenseExampleYear05	579
10 years	rr_ExpenseExampleYear10	1,283
1 year	rr_ExpenseExampleNoRedemptionYear01	107
3 years	rr_ExpenseExampleNoRedemptionYear03	334
5 years	rr_ExpenseExampleNoRedemptionYear05	579
10 years	rr_ExpenseExampleNoRedemptionYear10	1,283
1 Year	rr_AverageAnnualReturnYear01	3.52%
5 Years	rr_AverageAnnualReturnYear05	6.20%
10 Years	rr_AverageAnnualReturnYear10	5.53%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Strategic Income Fund | Class Y
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.10%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.62%
1 year	rr_ExpenseExampleYear01	63
3 years	rr_ExpenseExampleYear03	199
5 years	rr_ExpenseExampleYear05	346
10 years	rr_ExpenseExampleYear10	774
1 year	rr_ExpenseExampleNoRedemptionYear01	63
3 years	rr_ExpenseExampleNoRedemptionYear03	199
5 years	rr_ExpenseExampleNoRedemptionYear05	346
10 years	rr_ExpenseExampleNoRedemptionYear10	774
1 Year	rr_AverageAnnualReturnYear01	3.99%
5 Years	rr_AverageAnnualReturnYear05	6.32%
10 Years	rr_AverageAnnualReturnYear10	5.59%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 13, 2013
Columbia Strategic Income Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	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
Management fees	rr_ManagementFeesOverAssets	0.52%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.80%
1 year	rr_ExpenseExampleYear01	82
3 years	rr_ExpenseExampleYear03	255
5 years	rr_ExpenseExampleYear05	444
10 years	rr_ExpenseExampleYear10	990
1 year	rr_ExpenseExampleNoRedemptionYear01	82
3 years	rr_ExpenseExampleNoRedemptionYear03	255
5 years	rr_ExpenseExampleNoRedemptionYear05	444
10 years	rr_ExpenseExampleNoRedemptionYear10	990
1 Year	rr_AverageAnnualReturnYear01	3.81%
5 Years	rr_AverageAnnualReturnYear05	6.44%
10 Years	rr_AverageAnnualReturnYear10	5.78%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 29, 1999
Columbia Strategic Income Fund | returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(3.35%)
5 Years	rr_AverageAnnualReturnYear05	3.01%
10 Years	rr_AverageAnnualReturnYear10	2.76%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 21, 1977
Columbia Strategic Income Fund | returns after taxes on distributions and sale of Fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(0.44%)
5 Years	rr_AverageAnnualReturnYear05	3.21%
10 Years	rr_AverageAnnualReturnYear10	2.99%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 21, 1977
Columbia Strategic Income Fund | Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.97%
5 Years	rr_AverageAnnualReturnYear05	4.45%
10 Years	rr_AverageAnnualReturnYear10	4.71%
Columbia Strategic Income Fund | BofAML US Cash Pay High Yield Constrained Index (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.45%
5 Years	rr_AverageAnnualReturnYear05	8.83%
10 Years	rr_AverageAnnualReturnYear10	7.53%
Columbia Strategic Income Fund | Citigroup Non-USD World Government Bond (All Maturities) Index - Unhedged (Citigroup Non U.S. WGBI - Unhedged) (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(2.68%)
5 Years	rr_AverageAnnualReturnYear05	0.85%
10 Years	rr_AverageAnnualReturnYear10	2.64%
Columbia Strategic Income Fund | JPMorgan Emerging Markets Bond Index-Global (EMBI Global) (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.53%
5 Years	rr_AverageAnnualReturnYear05	7.27%
10 Years	rr_AverageAnnualReturnYear10	7.68%
Columbia Strategic Income Fund | Blended Benchmark (35% Barclays U.S. Aggregate Bond Index, 35% BofAML U.S. Cash Pay High Yield Constrained Index, 15% Citigroup Non-U.S. World Government Bond (All Maturities) Index - Unhedged (Citigroup Non U.S. WGBI - Unhedged), 15% J.P. Morgan Emerging Markets Bond Index Global (EMBI Global) (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	3.37%
5 Years	rr_AverageAnnualReturnYear05	5.90%
10 Years	rr_AverageAnnualReturnYear10	5.97%
Columbia Strategic Income Fund | Barclays U.S. Government/Credit Bond Index (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	6.01%
5 Years	rr_AverageAnnualReturnYear05	4.69%
10 Years	rr_AverageAnnualReturnYear10	4.70%

[1] 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.

[2] Other expenses for Class A, Class B, Class C, Class K, Class R, Class R4, Class R5, Class W and Class Z shares have been restated to reflect current fees paid by the Fund.

[3] This charge decreases over time.

[4] This charge applies to redemptions within one year after purchase, with certain limited exceptions.