The Fund seeks total return, consisting of current income exempt from federal income tax and California individual income tax and of capital appreciation, consistent with moderate fluctuation of principal.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

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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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 21 of this prospectus and in Appendix S to the Statement of Additional Information 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

14.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C, Class R4 or Class Z shares of the Fund 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 table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire on February 28, 2014, they are only reflected in the 1 year example and the first year of the 3, 5 and 10 year examples.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal bonds that pay interest exempt from federal income tax (including the federal alternative minimum tax) and California individual income tax. These securities are issued by the State of California and its political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund may invest in bonds of any maturity. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

The Fund primarily invests in municipal securities that, at the time of purchase, are rated investment grade or are unrated but determined to be of comparable quality. The Fund also may invest up to 25% of its total assets in securities that, at the time of purchase, are rated below investment grade or are unrated but determined to be of comparable quality, which are commonly referred to as "junk bonds." The Fund may also invest in zero-coupon bonds.

The Fund may invest in derivatives, including futures, such as exchange-traded futures contracts, primarily for hedging purposes.

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Columbia Management Investment Advisers, LLC, the Fund's investment adviser (the Investment Manager) evaluates a number of factors in identifying investment opportunities and constructing the Fund's portfolio. The Investment Manager considers local, national and global economic conditions, market conditions, interest rate movements and other relevant factors to determine the allocation of the Fund's assets among different issuers, industry sectors and maturities.

The Investment Manager, in connection with selecting individual investments for the Fund, evaluates a security based on its potential to generate income and/or capital appreciation. The Investment Manager considers, among other factors, the creditworthiness of the issuer of the security and the various features of the security, such as its interest rate, yield, maturity, any call features and value relative to other securities.

The Investment Manager may sell a security if the Investment Manager believes that there is deterioration in the issuer's financial circumstances, or that other investments are more attractive; if there is deterioration in a security's credit rating; or for other reasons.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Zero-Coupon Bonds Risk – Zero-coupon bonds are bonds that do not pay interest in cash on a current basis, but instead accrue interest over the life of the bond. As a result, these securities are issued at a discount and their values may fluctuate more than the values of similar securities that pay interest periodically. Although these securities pay no interest to holders prior to maturity, interest accrued on these securities is reported as income to the Fund and affects the amounts distributed to its shareholders.

Derivatives Risk – Derivatives are financial contracts whose values are, for example, based on (or "derived" from) traditional securities (such as a stock or bond), assets (such as a commodity like gold or a foreign currency), reference rates (such as LIBOR) or market indices (such as the Standard & Poor's (S&P) 500® Index). Derivatives involve special risks and may result in losses or may limit the Fund's potential gain from favorable market movements. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security or other asset. The values of derivatives may move in unexpected ways, especially in unusual market conditions, and may result in increased volatility, among other consequences. The use of derivatives may also increase the amount of taxes payable by shareholders holding shares in a taxable account. Other risks arise from the Fund's potential inability to terminate or to sell derivative positions. A liquid secondary market may not always exist for the Fund's derivative positions at times when the Fund might wish to terminate or to sell such positions. Over-the-counter instruments (investments not traded on an exchange) may be illiquid, and transactions in derivatives traded in the over-the-counter market are subject to the risk that the other party will not meet its obligations. The use of derivatives also involves the risks of mispricing or improper valuation and that changes in the value of the derivative may not correlate perfectly with the underlying security, asset, reference rate or index. The Fund also may not be able to find a suitable derivative transaction counterparty, and thus may be unable to engage in derivative transactions when it is deemed favorable to do so, or at all. U.S. federal legislation has recently been enacted that provides for new clearing, margin, reporting and registration requirements for participants in the derivatives market. While the ultimate impact is not yet clear, these changes could restrict and/or impose significant costs or other burdens upon the Fund's participation in derivatives transactions. For more information on the risks of derivative investments and strategies, see the Statement of Additional Information.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

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. Class A share performance (without sales charges) is shown in the bar chart because Class A is the oldest share class of the Fund. The inception date for the Fund's Class Z shares is September 19, 2005. The returns shown for Class Z shares include the returns of the Fund's Class A shares (without sales charges) for periods prior to its inception date. Class R4 shares of the Fund had not commenced operations prior to the date of this prospectus; therefore, performance information for Class R4 shares is not yet available. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), these classes of shares would have annual returns substantially similar to those of Class A shares, because all classes of the Fund's shares invest in the same portfolio of securities. The returns shown for Class Z shares have not been adjusted to reflect differences in expenses between such shares and Class A 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 www.columbiamanagement.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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 Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:   10.08%

Worst:   4th quarter 2010:   -6.21%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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 Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of the Barclays Municipal Bond Index, the Barclays California Municipal Bond Index and the Lipper California Municipal Debt Funds Classification. The Barclays Municipal Bond Index, the Fund's primary benchmark, is considered representative of the broad market for investment-grade, tax-exempt bonds with maturity of at least one year. The Fund also measures itself against the Barclays California Municipal Bond Index, as a secondary benchmark, because the Investment Manager believes that the additional index provides a reasonable view of the available municipal investment opportunities in California and therefore provides an additional useful performance comparison. The Barclays California Municipal Bond Index is a subset of the Barclays Municipal Bond Index consisting solely of bonds issued by obligors located in the state of California. The Lipper California Municipal Debt Funds Classification is a calculation of average total returns of mutual funds that generally limit assets to those securities that pay interest exempt from U.S. federal and California state income taxes.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table above 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.

(Columbia California Tax-Exempt Fund) | Lipper California Municipal Debt Funds Classification (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.22%

5 Years

rr_AverageAnnualReturnYear05

5.50%

10 Years

rr_AverageAnnualReturnYear10

4.54%

(Columbia California Tax-Exempt Fund) | Barclays California Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

8.15%

5 Years

rr_AverageAnnualReturnYear05

6.10%

10 Years

rr_AverageAnnualReturnYear10

5.29%

(Columbia California Tax-Exempt Fund) | Barclays Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.78%

5 Years

rr_AverageAnnualReturnYear05

5.91%

10 Years

rr_AverageAnnualReturnYear10

5.10%

(Columbia California Tax-Exempt Fund) | Class A Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.17%

^[4]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.89%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.11%)

^[13]

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

rr_NetExpensesOverAssets

0.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

551

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

735

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

934

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,509

Annual Return 2003

rr_AnnualReturn2003

5.10%

Annual Return 2004

rr_AnnualReturn2004

4.51%

Annual Return 2005

rr_AnnualReturn2005

3.84%

Annual Return 2006

rr_AnnualReturn2006

4.84%

Annual Return 2007

rr_AnnualReturn2007

1.97%

Annual Return 2008

rr_AnnualReturn2008

(6.42%)

Annual Return 2009

rr_AnnualReturn2009

13.79%

Annual Return 2010

rr_AnnualReturn2010

2.27%

Annual Return 2011

rr_AnnualReturn2011

12.30%

Annual Return 2012

rr_AnnualReturn2012

10.52%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.08%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(6.21%)

1 Year

rr_AverageAnnualReturnYear01

5.21%

5 Years

rr_AverageAnnualReturnYear05

5.19%

10 Years

rr_AverageAnnualReturnYear10

4.61%

(Columbia California Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.20%

5 Years

rr_AverageAnnualReturnYear05

5.11%

10 Years

rr_AverageAnnualReturnYear10

4.51%

(Columbia California Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.78%

5 Years

rr_AverageAnnualReturnYear05

5.01%

10 Years

rr_AverageAnnualReturnYear10

4.48%

(Columbia California Tax-Exempt Fund) | Class B Shares

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%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.17%

^[4]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.64%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.11%)

^[13]

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

rr_NetExpensesOverAssets

1.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

656

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

807

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,081

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,734

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

156

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

507

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

881

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,734

1 Year

rr_AverageAnnualReturnYear01

4.69%

5 Years

rr_AverageAnnualReturnYear05

5.09%

10 Years

rr_AverageAnnualReturnYear10

4.34%

(Columbia California Tax-Exempt Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.17%

^[4]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.64%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.11%)

^[13]

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

rr_NetExpensesOverAssets

1.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

256

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

507

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

881

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,934

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

156

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

507

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

881

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,934

1 Year

rr_AverageAnnualReturnYear01

8.88%

5 Years

rr_AverageAnnualReturnYear05

5.73%

10 Years

rr_AverageAnnualReturnYear10

4.65%

(Columbia California Tax-Exempt Fund) | Class R4 Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.17%

^[4]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.64%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.11%)

^[13]

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

rr_NetExpensesOverAssets

0.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

194

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

346

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

788

(Columbia California Tax-Exempt Fund) | Class Z Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.17%

^[4]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.64%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.11%)

^[13]

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

rr_NetExpensesOverAssets

0.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

194

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

346

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

788

1 Year

rr_AverageAnnualReturnYear01

10.65%

5 Years

rr_AverageAnnualReturnYear05

6.46%

10 Years

rr_AverageAnnualReturnYear10

5.30%

(Columbia Connecticut Intermediate Municipal Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks as high a level of current interest income exempt from federal income tax and, to the extent possible, from Connecticut individual income tax, as is consistent with relative stability of principal.

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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 20 of this prospectus and in Appendix S to the Statement of Additional Information 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

19.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C, Class R4, Class T or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal securities that pay interest exempt from federal income tax (including the federal alternative minimum tax) and Connecticut individual income tax. These securities are issued by the State of Connecticut and its political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund normally invests at least 80% of its total assets in municipal securities that, at the time of purchase, are rated investment grade or are unrated but determined to be of comparable quality. Under normal circumstances, the Fund's dollar-weighted average maturity will be between three and ten years. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

The Fund may invest up to 10% of its total assets in securities that, at the time of purchase, are rated below investment grade or are unrated but determined to be of comparable quality (commonly referred to as "high yield securities" or "junk bonds").

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

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. Class Z share performance is shown in the bar chart because Class Z is the oldest share class of the Fund. Class R4 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for this class is not yet available. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), this class of shares would have annual returns substantially similar to those of Class Z shares, because all classes of the Fund's shares invest in the same portfolio of securities.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    4.69%

Worst:   4th quarter 2010:   -3.36%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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 Z shares and will vary for other share classes.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Connecticut Intermediate Municipal Bond Fund) | Barclays 3-15 Year Blend Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.15%

5 Years

rr_AverageAnnualReturnYear05

5.88%

10 Years

rr_AverageAnnualReturnYear10

4.91%

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class A Shares

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.25%

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.99%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[14]

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

rr_NetExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

405

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

613

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

837

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,483

1 Year

rr_AverageAnnualReturnYear01

0.59%

5 Years

rr_AverageAnnualReturnYear05

3.73%

10 Years

rr_AverageAnnualReturnYear10

2.99%

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class B Shares

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

3.00%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.74%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[14]

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

rr_NetExpensesOverAssets

1.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

459

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

730

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

927

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,838

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

159

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

530

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

927

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,838

1 Year

rr_AverageAnnualReturnYear01

0.24%

5 Years

rr_AverageAnnualReturnYear05

3.64%

10 Years

rr_AverageAnnualReturnYear10

2.72%

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.74%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[14]

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

rr_NetExpensesOverAssets

1.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

259

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

530

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

927

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,037

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

159

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

530

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

927

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,037

1 Year

rr_AverageAnnualReturnYear01

2.60%

5 Years

rr_AverageAnnualReturnYear05

4.01%

10 Years

rr_AverageAnnualReturnYear10

3.07%

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class R4 Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.74%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[14]

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

rr_NetExpensesOverAssets

0.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

218

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

394

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

902

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class T Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.42%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.89%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[14]

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

rr_NetExpensesOverAssets

0.71%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

544

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

728

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

928

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,503

1 Year

rr_AverageAnnualReturnYear01

(0.85%)

5 Years

rr_AverageAnnualReturnYear05

3.52%

10 Years

rr_AverageAnnualReturnYear10

3.09%

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class Z Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.27%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.74%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[14]

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

rr_NetExpensesOverAssets

0.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

218

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

394

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

902

Annual Return 2003

rr_AnnualReturn2003

3.58%

Annual Return 2004

rr_AnnualReturn2004

2.60%

Annual Return 2005

rr_AnnualReturn2005

1.54%

Annual Return 2006

rr_AnnualReturn2006

3.40%

Annual Return 2007

rr_AnnualReturn2007

3.02%

Annual Return 2008

rr_AnnualReturn2008

(0.54%)

Annual Return 2009

rr_AnnualReturn2009

9.15%

Annual Return 2010

rr_AnnualReturn2010

2.12%

Annual Return 2011

rr_AnnualReturn2011

8.76%

Annual Return 2012

rr_AnnualReturn2012

4.27%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

4.69%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.36%)

1 Year

rr_AverageAnnualReturnYear01

4.27%

5 Years

rr_AverageAnnualReturnYear05

4.68%

10 Years

rr_AverageAnnualReturnYear10

3.75%

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.21%

5 Years

rr_AverageAnnualReturnYear05

4.67%

10 Years

rr_AverageAnnualReturnYear10

3.74%

(Columbia Connecticut Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.93%

5 Years

rr_AverageAnnualReturnYear05

4.51%

10 Years

rr_AverageAnnualReturnYear10

3.71%

(Columbia Connecticut Tax-Exempt Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks total return, consisting of current income exempt from federal income tax and Connecticut individual income tax and of capital appreciation, consistent with moderate fluctuation of principal.

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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 20 of this prospectus and in Appendix S to the Statement of Additional Information 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

14.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

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Under normal circumstances, the Fund invests at least 80% of its net assets in municipal bonds that pay interest exempt from federal income tax (including the federal alternative minimum tax) and Connecticut individual income tax. These securities are issued by the State of Connecticut and its political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund may invest in bonds of any maturity. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

The Fund may invest in derivatives, including futures, such as exchange-traded futures contracts, primarily for hedging purposes.

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Risk [Heading]

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Principal Risks

Risk Narrative [Text Block]

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Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Zero-Coupon Bonds Risk – Zero-coupon bonds are bonds that do not pay interest in cash on a current basis, but instead accrue interest over the life of the bond. As a result, these securities are issued at a discount and their values may fluctuate more than the values of similar securities that pay interest periodically. Although these securities pay no interest to holders prior to maturity, interest accrued on these securities is reported as income to the Fund and affects the amounts distributed to its shareholders.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Derivatives Risk – Derivatives are financial contracts whose values are, for example, based on (or "derived" from) traditional securities (such as a stock or bond), assets (such as a commodity like gold or a foreign currency), reference rates (such as LIBOR) or market indices (such as the Standard & Poor's (S&P) 500® Index). Derivatives involve special risks and may result in losses or may limit the Fund's potential gain from favorable market movements. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security or other asset. The values of derivatives may move in unexpected ways, especially in unusual market conditions, and may result in increased volatility, among other consequences. The use of derivatives may also increase the amount of taxes payable by shareholders holding shares in a taxable account. Other risks arise from the Fund's potential inability to terminate or to sell derivative positions. A liquid secondary market may not always exist for the Fund's derivative positions at times when the Fund might wish to terminate or to sell such positions. Over-the-counter instruments (investments not traded on an exchange) may be illiquid, and transactions in derivatives traded in the over-the-counter market are subject to the risk that the other party will not meet its obligations. The use of derivatives also involves the risks of mispricing or improper valuation and that changes in the value of the derivative may not correlate perfectly with the underlying security, asset, reference rate or index. The Fund also may not be able to find a suitable derivative transaction counterparty, and thus may be unable to engage in derivative transactions when it is deemed favorable to do so, or at all. U.S. federal legislation has recently been enacted that provides for new clearing, margin, reporting and registration requirements for participants in the derivatives market. While the ultimate impact is not yet clear, these changes could restrict and/or impose significant costs or other burdens upon the Fund's participation in derivatives transactions. For more information on the risks of derivative investments and strategies, see the Statement of Additional Information.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Risk Nondiversified Status [Text]

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Bar Chart and Performance Table [Heading]

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Performance Information

Performance Narrative [Text Block]

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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. Class A share performance (without sales charges) is shown in the bar chart because Class A is the oldest share class of the Fund. The inception date for the Fund's Class Z shares is September 27, 2010. The returns shown for Class Z shares include the returns of the Fund's Class A shares (without sales charges) for periods prior to its inception date. Except for differences in expenses and sales charges (where applicable), Class Z shares would have annual returns substantially similar to those of Class A shares, because all classes of the Fund's shares invest in the same portfolio of securities. The returns shown for Class Z shares have not been adjusted to reflect any differences in expenses between Class Z shares and Class A shares.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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]

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

Bar Chart Narrative [Text Block]

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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 Does Not Reflect Sales Loads [Text]

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If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    6.97%

Worst:   4th quarter 2010:   -5.29%

Performance Table Heading

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Average Annual Total Return as of December 31, 2012

Performance Table Uses Highest Federal Rate

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Performance Table Not Relevant to Tax Deferred

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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

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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

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The table compares the Fund's returns for each period with those of the Barclays Municipal Bond Index, the Barclays Connecticut Municipal Bond Index and the Lipper Connecticut Municipal Debt Funds Classification. The Barclays Municipal Bond Index, the Fund's primary benchmark, is considered representative of the broad market for investment-grade, tax-exempt bonds with maturity of at least one year. The Fund also measures itself against the Barclays Connecticut Municipal Bond Index, as a secondary benchmark, because the Investment Manager believes that the additional index provides a reasonable view of the available municipal investment opportunities in Connecticut and therefore provides an additional useful performance comparison. The Barclays Connecticut Municipal Bond Index is a subset of the Barclays Municipal Bond Index consisting solely of bonds issued by obligors located in the state of Connecticut. The Lipper Connecticut Municipal Debt Funds Classification is a calculation of average total returns of mutual funds that generally limit assets to those securities that pay interest exempt from U.S. federal and Connecticut state income taxes.

Performance Table Closing [Text Block]

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(Columbia Connecticut Tax-Exempt Fund) | Lipper Connecticut Municipal Debt Funds Classification (reflects no deductions for taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.21%

5 Years

rr_AverageAnnualReturnYear05

4.90%

10 Years

rr_AverageAnnualReturnYear10

4.15%

(Columbia Connecticut Tax-Exempt Fund) | Barclays Connecticut Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.98%

5 Years

rr_AverageAnnualReturnYear05

5.17%

10 Years

rr_AverageAnnualReturnYear10

4.45%

(Columbia Connecticut Tax-Exempt Fund) | Barclays Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.78%

5 Years

rr_AverageAnnualReturnYear05

5.91%

10 Years

rr_AverageAnnualReturnYear10

5.10%

(Columbia Connecticut Tax-Exempt Fund) | Class A Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.02%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.22%)

^[15]

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

rr_NetExpensesOverAssets

0.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

553

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

763

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

991

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,645

Annual Return 2003

rr_AnnualReturn2003

5.43%

Annual Return 2004

rr_AnnualReturn2004

2.98%

Annual Return 2005

rr_AnnualReturn2005

2.09%

Annual Return 2006

rr_AnnualReturn2006

3.92%

Annual Return 2007

rr_AnnualReturn2007

2.55%

Annual Return 2008

rr_AnnualReturn2008

(4.82%)

Annual Return 2009

rr_AnnualReturn2009

13.48%

Annual Return 2010

rr_AnnualReturn2010

1.60%

Annual Return 2011

rr_AnnualReturn2011

11.85%

Annual Return 2012

rr_AnnualReturn2012

7.08%

Highest Quarterly Return, Label

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3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

6.97%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.29%)

1 Year

rr_AverageAnnualReturnYear01

1.95%

5 Years

rr_AverageAnnualReturnYear05

4.60%

10 Years

rr_AverageAnnualReturnYear10

3.99%

(Columbia Connecticut Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.83%

5 Years

rr_AverageAnnualReturnYear05

4.52%

10 Years

rr_AverageAnnualReturnYear10

3.85%

(Columbia Connecticut Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.46%

5 Years

rr_AverageAnnualReturnYear05

4.42%

10 Years

rr_AverageAnnualReturnYear10

3.88%

(Columbia Connecticut Tax-Exempt Fund) | Class B Shares

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%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.77%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.22%)

^[15]

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

rr_NetExpensesOverAssets

1.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

658

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

836

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,139

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,868

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

158

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

536

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

939

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,868

1 Year

rr_AverageAnnualReturnYear01

1.41%

5 Years

rr_AverageAnnualReturnYear05

4.53%

10 Years

rr_AverageAnnualReturnYear10

3.73%

(Columbia Connecticut Tax-Exempt Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.77%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.22%)

^[15]

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

rr_NetExpensesOverAssets

1.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

258

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

536

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

939

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,066

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

158

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

536

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

939

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,066

1 Year

rr_AverageAnnualReturnYear01

5.73%

5 Years

rr_AverageAnnualReturnYear05

5.17%

10 Years

rr_AverageAnnualReturnYear10

4.04%

(Columbia Connecticut Tax-Exempt Fund) | Class Z Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.77%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.22%)

^[15]

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

rr_NetExpensesOverAssets

0.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

224

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

406

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

934

1 Year

rr_AverageAnnualReturnYear01

7.35%

5 Years

rr_AverageAnnualReturnYear05

5.71%

10 Years

rr_AverageAnnualReturnYear10

4.54%

(Columbia Intermediate Municipal Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks current income exempt from federal income tax, consistent with preservation of principal.

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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 19 of this prospectus and in Appendix S to the Statement of Additional Information 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

10.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C, Class R4, Class R5, Class T or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal securities that pay interest exempt from federal income tax (including the federal alternative minimum tax). These securities are issued by states and their political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund normally invests at least 80% of its total assets in municipal securities that, at the time of purchase, are rated investment grade or are unrated but determined to be of comparable quality. Under normal circumstances, the Fund's dollar-weighted average maturity will be between three and ten years. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

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. Class Z share performance is shown in the bar chart because Class Z is the oldest share class of the Fund. The inception date for the Fund's Class R5 shares is November 8, 2012. The returns shown for Class R5 shares include the returns of the Fund's Class Z shares (adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Class R4 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for Class R4 shares is not yet available. Except for differences in expenses and sales charges (where applicable), Class R4 and Class R5 shares would have annual returns substantially similar to those of Class Z shares, because all classes of the Fund's shares invest in the same portfolio of securities.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    6.20%

Worst:   4th quarter 2010:   -3.34%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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 Z shares and will vary for other share classes.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Intermediate Municipal Bond Fund) | Barclays 3-15 Year Blend Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.15%

5 Years

rr_AverageAnnualReturnYear05

5.88%

10 Years

rr_AverageAnnualReturnYear10

4.91%

(Columbia Intermediate Municipal Bond Fund) | Class A Shares

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.25%

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

0.45%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.20%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[7]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.86%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.12%)

^[16]

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

rr_NetExpensesOverAssets

0.74%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

398

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

579

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

775

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,341

1 Year

rr_AverageAnnualReturnYear01

1.91%

5 Years

rr_AverageAnnualReturnYear05

4.34%

10 Years

rr_AverageAnnualReturnYear10

3.50%

(Columbia Intermediate Municipal Bond Fund) | Class B Shares

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

3.00%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.85%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[7]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.51%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.12%)

^[16]

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

rr_NetExpensesOverAssets

1.39%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

442

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

665

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

812

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,616

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

142

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

465

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

812

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,616

1 Year

rr_AverageAnnualReturnYear01

1.63%

5 Years

rr_AverageAnnualReturnYear05

4.34%

10 Years

rr_AverageAnnualReturnYear10

3.33%

(Columbia Intermediate Municipal Bond Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.45%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.85%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[7]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.51%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.12%)

^[16]

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

rr_NetExpensesOverAssets

1.39%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

242

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

465

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

812

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,791

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

142

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

465

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

812

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,791

1 Year

rr_AverageAnnualReturnYear01

4.11%

5 Years

rr_AverageAnnualReturnYear05

4.81%

10 Years

rr_AverageAnnualReturnYear10

3.80%

(Columbia Intermediate Municipal Bond Fund) | Class R4 Shares

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

0.45%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[7]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.66%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.12%)

^[16]

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

rr_NetExpensesOverAssets

0.54%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

199

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

356

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

811

(Columbia Intermediate Municipal Bond Fund) | Class R5 Shares

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

0.45%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.07%

^[7]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.52%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.07%)

^[16]

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

rr_NetExpensesOverAssets

0.45%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

160

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

284

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

646

1 Year

rr_AverageAnnualReturnYear01

5.62%

5 Years

rr_AverageAnnualReturnYear05

5.24%

10 Years

rr_AverageAnnualReturnYear10

4.22%

(Columbia Intermediate Municipal Bond Fund) | Class T Shares

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

0.45%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.36%

^[7]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.81%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.12%)

^[16]

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

rr_NetExpensesOverAssets

0.69%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

542

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

710

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

892

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,418

1 Year

rr_AverageAnnualReturnYear01

0.34%

5 Years

rr_AverageAnnualReturnYear05

4.06%

10 Years

rr_AverageAnnualReturnYear10

3.55%

(Columbia Intermediate Municipal Bond Fund) | Class Z Shares

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

0.45%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[7]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.66%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.12%)

^[16]

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

rr_NetExpensesOverAssets

0.54%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

199

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

356

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

811

Annual Return 2003

rr_AnnualReturn2003

4.38%

Annual Return 2004

rr_AnnualReturn2004

2.74%

Annual Return 2005

rr_AnnualReturn2005

2.04%

Annual Return 2006

rr_AnnualReturn2006

3.80%

Annual Return 2007

rr_AnnualReturn2007

3.09%

Annual Return 2008

rr_AnnualReturn2008

(1.70%)

Annual Return 2009

rr_AnnualReturn2009

10.27%

Annual Return 2010

rr_AnnualReturn2010

2.82%

Annual Return 2011

rr_AnnualReturn2011

9.66%

Annual Return 2012

rr_AnnualReturn2012

5.62%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

6.20%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.34%)

1 Year

rr_AverageAnnualReturnYear01

5.62%

5 Years

rr_AverageAnnualReturnYear05

5.24%

10 Years

rr_AverageAnnualReturnYear10

4.22%

(Columbia Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.62%

5 Years

rr_AverageAnnualReturnYear05

5.24%

10 Years

rr_AverageAnnualReturnYear10

4.20%

(Columbia Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.87%

5 Years

rr_AverageAnnualReturnYear05

5.03%

10 Years

rr_AverageAnnualReturnYear10

4.15%

(Columbia International Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

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

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays 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 period, the Fund's fiscal year end changed from May 31 to October 31. For the fiscal period from June 1, 2012 to October 31, 2012, the Fund's portfolio turnover rate was 5% of the average value of its portfolio and for the prior fiscal year ended May 31, 2012, the Fund's portfolio turnover rate was 20% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

5.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class C, Class I, Class W or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its net assets in fixed-income securities of foreign (non-U.S.) issuers. Generally, the Fund seeks to achieve its investment objective by investing in debt securities of issuers in at least three foreign countries, including foreign governments, quasi-governments, provincials, agencies, instrumentalities, supranationals and corporate entities.

The Fund is not limited as to any particular countries in which it may invest. The Fund will invest in the securities of issuers in developed countries and the securities of issuers in emerging or developing countries. Securities may be denominated in foreign (non-U.S. dollar) currencies, baskets of foreign currencies or the U.S. dollar.

The Fund's dollar-weighted average maturity and duration will vary, based on the forecast for interest rates, in various countries. Duration measures the sensitivity of fixed-income security prices to changes in interest rates. The longer the duration of a fixed-income security, the more sensitive that security will be to changes in interest rates. For example, a bond with a three-year duration is expected to decrease in value by 3% if interest rates rise 1% and increase in value by 3% if interest rates fall 1%. The Fund does not have a duration target.

Under normal market conditions, at least 80% of the Fund's net assets (including the amount of any borrowings for investment purposes) will be invested in investment-grade government or corporate debt obligations, including money market instruments, of issuers located in at least three foreign countries. Although the Fund emphasizes high- and medium-quality debt securities, it may assume some credit risk in seeking to achieve higher dividends and/or capital appreciation by investing in below investment-grade fixed-income securities (commonly referred to as "high yield securities" or "junk bonds").

The Fund may invest in derivatives, including futures, forwards, options, swap contracts and other derivative instruments. The Fund may invest in derivatives for both hedging and non-hedging purposes, including, for example, to seek to enhance returns or as a substitute for a position in an underlying asset. The Fund may attempt to hedge the effects of currency value fluctuations on the Fund's investments.

The Fund also may invest in private placements.

In addition, the Fund may use futures (including index and currency futures) in an effort to produce incremental earnings, to hedge existing positions, to increase market or credit exposure, to increase investment flexibility (including using the derivative as a substitute for the purchase or sale of an underlying security, currency, commodity or other instrument).

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Foreign Securities Risk – Foreign securities are subject to special risks as compared to securities of U.S. issuers. For example, foreign markets can be extremely volatile. Fluctuations in currency exchange rates may impact the value of foreign securities denominated in foreign currencies, or in U.S. dollars, without a change in the intrinsic value of those securities. Foreign securities may be less liquid than domestic securities so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial fees and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose potentially confiscatory withholding or other taxes, which could reduce the amount of income and capital gains available to distribute to shareholders. Other risks include possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about companies; the impact of political, social or diplomatic events; possible seizure, expropriation or nationalization of a company or its assets; possible imposition of currency exchange controls; and accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies.

Currency Risk – Securities denominated in non-U.S. dollar currencies are subject to the risk that, for example, if the value of a foreign currency were to decline against the U.S. dollar, such decline would reduce the U.S. dollar value of any securities held by the Fund denominated in that currency.

Emerging Market Securities Risk – Securities issued by foreign governments or companies in emerging market countries, like Russia and those 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 social, political and economic development. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity 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, which makes them more sensitive to world commodity prices and economic downturns in other countries. Some emerging market countries have a higher risk of currency devaluations, and some of these countries may experience periods of high inflation or rapid changes in inflation rates.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Liquidity Risk – Illiquid securities are securities that cannot be readily disposed of in the normal course of business. There is a risk that the Fund may not be able to sell such securities at the time it desires or without adversely affecting their price.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Rule 144A Securities Risk — The Fund may invest in privately placed securities that have not been registered for sale under the Securities Act of 1933 pursuant to Rule 144A (Rule 144A securities) that are determined to be liquid in accordance with procedures adopted by the Fund's Board of Trustees. 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. The Fund may also have to bear the expense of registering the securities for resale and the risk of substantial delays in effecting the registration. Additionally, the purchase price and subsequent valuation of restricted and illiquid securities normally reflect a discount, which may be significant, from the market price of comparable securities for which a more liquid market exists.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

Derivatives Risk – Forward Foreign Currency Contracts – The Fund may enter into forward foreign currency contracts, which are a type of derivative contract, whereby the Fund may agree to buy or sell a country's currency at a specific price on a specific date, usually 30, 60, or 90 days in the future. These currency contracts may change in value due to foreign market fluctuations or foreign currency value fluctuations. The effectiveness of any currency hedging strategy by a Fund may be reduced by the Fund's inability to precisely match forward contract amounts and the value of securities involved. Forward foreign currency contracts used for hedging may also limit any potential gain that might result from an increase or decrease in the value of the currency. When entering into forward foreign currency contracts for investment purposes, unanticipated changes in the currency markets could result in reduced performance for the Fund. At or prior to maturity of a forward contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been movement in forward contract prices. When the Fund converts its foreign currencies into U.S. dollars it may incur currency conversion costs due to the spread between the prices at which it may buy and sell various currencies in the market.

Derivatives Risk — Options – The Fund may buy and sell call and put options, including options on currencies, interest rates and swap agreements (commonly referred to as swaptions), for investment purposes, for risk management (hedging) purposes, and to increase investment flexibility. 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 theoretically unlimited.

Derivatives Risk — Swap Agreements — The Fund may enter into swap agreements, for, among other reasons, to seek to obtain or preserve a desired return or spread at a lower cost than through a direct investment in an instrument that yields the desired return or spread. A swap agreement can increase or decrease the volatility of the Fund's investments and its net asset value. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged, are subject to the risk that a counterparty becomes bankrupt or otherwise fails to perform its obligations, may be difficult to value and may not be possible for the Fund to liquidate at an advantageous time or price, which may result in significant losses.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Bar Chart and Performance Table [Heading]

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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. Class A share performance (without sales charges) is shown in the bar chart because Class A shares have been outstanding as long as any other share class of the Fund. The inception date for the Fund's Class I shares is September 27, 2010; and the inception date for the Fund's Class W shares is June 18, 2012. The returns shown for each of these classes of shares include the returns for the Fund's Class A shares (without sales charges) for periods prior to its inception date. Except for differences in expenses and sales charges (where applicable), these classes of shares would have annual returns substantially similar to those of Class A shares, because all classes of the Fund's shares invest in the same portfolio of securities. The returns shown for Class I and Class W shares have not been adjusted to reflect any differences in expenses between such shares and Class A shares.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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 Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2010:   10.26%

Worst:   1st quarter 2009:   -4.88%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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 Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of the Fund's primary benchmark, the Citigroup Non-U.S. Dollar World Government Bond (All Maturities) Index (the Citigroup Non-U.S. WGBI or the Primary Benchmark). The Citigroup Non-U.S. WGBI is calculated on a market-weighted basis and includes investment-grade, fixed-rate bonds, issued by governments outside of the United States (currently, 21 countries), with a remaining maturity of one year or longer and with amounts outstanding of at least the equivalent of U.S. $25 million.

The table also compares the Fund's returns to a secondary benchmark, which is a weighted custom composite, established by the Investment Manager (the Blended Benchmark). The Blended Benchmark consists of a 60% weighting in the Citigroup World Government Bond (excluding the U.S. and Japan) Index (the Citigroup WGBI - ex U.S./Japan), a 20% weighting in the Citigroup Japan Government Bond Index (the Citigroup Japan GBI) and a 20% weighting in the JPMorgan Government Bond Index - Emerging Markets Global Diversified Composite (the JPM GBI EM - Global Diversified). The Citigroup WGBI - ex U.S./Japan has the same calculation and inclusion criteria as the Primary Benchmark, while excluding issues from the United States and also Japan. The Citigroup Japan GBI is a market-weighted index based on Yen-denominated debt instruments issued by the government of Japan. The JPM GBI - EM Global Diversified tracks total returns for emerging markets local-currency-denominated fixed income instruments. The Primary Benchmark and the components of the Blended Benchmark are each "unhedged" against non-U.S. dollar denominated currency value fluctuation.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia International Bond Fund) | Citigroup Non-U.S. Dollar World Government Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.51%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

5.91%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | 60-20-20 Citi WGBI ex US Japan/Citi Japan GBI/JPM GBI EM GD (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.93%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

8.44%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | Class A Shares

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

0.65%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.65%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.55%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.46%)

^[17]

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

rr_NetExpensesOverAssets

1.09%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

581

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

898

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,238

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,196

Annual Return 2009

rr_AnnualReturn2009

4.77%

Annual Return 2010

rr_AnnualReturn2010

5.73%

Annual Return 2011

rr_AnnualReturn2011

3.14%

Annual Return 2012

rr_AnnualReturn2012

7.67%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2010:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.26%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

1st quarter 2009:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(4.88%)

1 Year

rr_AverageAnnualReturnYear01

2.55%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

5.12%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | Class A Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.96%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

4.25%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | Class A Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.65%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

3.87%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.65%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.65%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

2.30%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.46%)

^[17]

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

rr_NetExpensesOverAssets

1.84%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

287

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

674

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,188

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,600

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

187

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

674

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,188

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,600

1 Year

rr_AverageAnnualReturnYear01

5.82%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

5.56%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | Class I Shares

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

0.65%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.48%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.13%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.39%)

^[17]

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

rr_NetExpensesOverAssets

0.74%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

320

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

585

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,340

1 Year

rr_AverageAnnualReturnYear01

7.98%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

6.55%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | Class W Shares

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

0.65%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.65%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.55%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.46%)

^[17]

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

rr_NetExpensesOverAssets

1.09%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

111

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

444

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

801

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,806

1 Year

rr_AverageAnnualReturnYear01

7.39%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

5.88%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia International Bond Fund) | Class Z Shares

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

0.65%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.65%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.30%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.46%)

^[17]

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

rr_NetExpensesOverAssets

0.84%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

367

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

669

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,527

1 Year

rr_AverageAnnualReturnYear01

7.85%

Life of Fund (December 01, 2008)

rr_AverageAnnualReturnSinceInception

6.63%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2008

(Columbia Massachusetts Intermediate Municipal Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks as high a level of current interest income exempt from federal income tax and, to the extent possible, from Massachusetts individual income tax, as is consistent with relative stability of principal.

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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 20 of this prospectus and in Appendix S to the Statement of Additional Information 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

11.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C, Class R4, Class T or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal securities that pay interest exempt from federal income tax (including the federal alternative minimum tax) and Massachusetts individual income tax. These securities are issued by the Commonwealth of Massachusetts and its political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund normally invests at least 80% of its total assets in municipal securities that, at the time of purchase, are rated investment grade or are unrated but determined to be of comparable quality. Under normal circumstances, the Fund's dollar-weighted average maturity will be between three and ten years. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    5.62%

Worst:   4th quarter 2010:   -3.06%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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 Z shares and will vary for other share classes.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Barclays 3-15 Year Blend Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.15%

5 Years

rr_AverageAnnualReturnYear05

5.88%

10 Years

rr_AverageAnnualReturnYear10

4.91%

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class A Shares

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.25%

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.26%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.98%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[14]

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

rr_NetExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

405

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

611

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

833

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,472

1 Year

rr_AverageAnnualReturnYear01

0.54%

5 Years

rr_AverageAnnualReturnYear05

4.25%

10 Years

rr_AverageAnnualReturnYear10

3.35%

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class B Shares

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

3.00%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.26%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.73%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[14]

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

rr_NetExpensesOverAssets

1.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

459

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

728

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

923

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,828

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

159

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

528

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

923

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,828

1 Year

rr_AverageAnnualReturnYear01

0.17%

5 Years

rr_AverageAnnualReturnYear05

4.16%

10 Years

rr_AverageAnnualReturnYear10

3.08%

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.26%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.73%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[14]

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

rr_NetExpensesOverAssets

1.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

259

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

528

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

923

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,027

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

159

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

528

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

923

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,027

1 Year

rr_AverageAnnualReturnYear01

2.55%

5 Years

rr_AverageAnnualReturnYear05

4.53%

10 Years

rr_AverageAnnualReturnYear10

3.44%

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class R4 Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.26%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.73%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[14]

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

rr_NetExpensesOverAssets

0.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

216

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

389

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

890

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class T Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.41%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.88%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[14]

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

rr_NetExpensesOverAssets

0.71%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

544

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

726

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

924

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,493

1 Year

rr_AverageAnnualReturnYear01

(0.90%)

5 Years

rr_AverageAnnualReturnYear05

4.03%

10 Years

rr_AverageAnnualReturnYear10

3.46%

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class Z Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.26%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.73%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[14]

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

rr_NetExpensesOverAssets

0.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

216

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

389

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

890

Annual Return 2003

rr_AnnualReturn2003

3.91%

Annual Return 2004

rr_AnnualReturn2004

2.68%

Annual Return 2005

rr_AnnualReturn2005

1.82%

Annual Return 2006

rr_AnnualReturn2006

3.40%

Annual Return 2007

rr_AnnualReturn2007

3.38%

Annual Return 2008

rr_AnnualReturn2008

1.08%

Annual Return 2009

rr_AnnualReturn2009

9.09%

Annual Return 2010

rr_AnnualReturn2010

2.69%

Annual Return 2011

rr_AnnualReturn2011

9.21%

Annual Return 2012

rr_AnnualReturn2012

4.22%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

5.62%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.06%)

1 Year

rr_AverageAnnualReturnYear01

4.22%

5 Years

rr_AverageAnnualReturnYear05

5.21%

10 Years

rr_AverageAnnualReturnYear10

4.12%

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.21%

5 Years

rr_AverageAnnualReturnYear05

5.20%

10 Years

rr_AverageAnnualReturnYear10

4.09%

(Columbia Massachusetts Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.87%

5 Years

rr_AverageAnnualReturnYear05

4.97%

10 Years

rr_AverageAnnualReturnYear10

4.03%

(Columbia Massachusetts Tax-Exempt Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks total return, consisting of current income exempt from federal income tax and Massachusetts individual income tax and of capital appreciation, consistent with moderate fluctuation of principal.

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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 20 of this prospectus and in Appendix S to the Statement of Additional Information 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

21.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal bonds that pay interest exempt from federal income tax (including the federal alternative minimum tax) and Massachusetts individual income tax. These securities are issued by the Commonwealth of Massachusetts and its political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund may invest in bonds of any maturity. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

The Fund may invest in derivatives, including futures, such as exchange-traded futures contracts, primarily for hedging purposes.

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Zero-Coupon Bonds Risk – Zero-coupon bonds are bonds that do not pay interest in cash on a current basis, but instead accrue interest over the life of the bond. As a result, these securities are issued at a discount and their values may fluctuate more than the values of similar securities that pay interest periodically. Although these securities pay no interest to holders prior to maturity, interest accrued on these securities is reported as income to the Fund and affects the amounts distributed to its shareholders.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Derivatives Risk – Derivatives are financial contracts whose values are, for example, based on (or "derived" from) traditional securities (such as a stock or bond), assets (such as a commodity like gold or a foreign currency), reference rates (such as LIBOR) or market indices (such as the Standard & Poor's (S&P) 500® Index). Derivatives involve special risks and may result in losses or may limit the Fund's potential gain from favorable market movements. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security or other asset. The values of derivatives may move in unexpected ways, especially in unusual market conditions, and may result in increased volatility, among other consequences. The use of derivatives may also increase the amount of taxes payable by shareholders holding shares in a taxable account. Other risks arise from the Fund's potential inability to terminate or to sell derivative positions. A liquid secondary market may not always exist for the Fund's derivative positions at times when the Fund might wish to terminate or to sell such positions. Over-the-counter instruments (investments not traded on an exchange) may be illiquid, and transactions in derivatives traded in the over-the-counter market are subject to the risk that the other party will not meet its obligations. The use of derivatives also involves the risks of mispricing or improper valuation and that changes in the value of the derivative may not correlate perfectly with the underlying security, asset, reference rate or index. The Fund also may not be able to find a suitable derivative transaction counterparty, and thus may be unable to engage in derivative transactions when it is deemed favorable to do so, or at all. U.S. federal legislation has recently been enacted that provides for new clearing, margin, reporting and registration requirements for participants in the derivatives market. While the ultimate impact is not yet clear, these changes could restrict and/or impose significant costs or other burdens upon the Fund's participation in derivatives transactions. For more information on the risks of derivative investments and strategies, see the Statement of Additional Information.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Bar Chart and Performance Table [Heading]

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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. Class A share performance (without sales charges) is shown in the bar chart because Class A is the oldest share class of the Fund. The inception date for the Fund's Class Z shares is September 1, 2011. The returns shown for Class Z shares include the returns for the Fund's Class A shares (without sales charges) for periods prior to its inception date. Except for differences in expenses and sales charges (where applicable), Class Z shares would have annual returns substantially similar to those of Class A shares, because all classes of the Fund's shares invest in the same portfolio of securities. The returns shown for Class Z shares have not been adjusted to reflect any differences in expenses between Class Z shares and Class A shares.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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 Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    8.63%

Worst:   4th quarter 2010:   -6.23%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of the Barclays Municipal Bond Index, the Barclays Massachusetts Municipal Bond Index and the Lipper Massachusetts Municipal Debt Funds Classification. The Barclays Municipal Bond Index, the Fund's primary benchmark, is considered representative of the broad market for investment-grade, tax-exempt bonds with maturity of at least one year. The Fund also measures itself against the Barclays Massachusetts Municipal Bond Index, as a secondary benchmark, because the Investment Manager believes that the additional index provides a reasonable view of the available municipal investment opportunities in Massachusetts and therefore provides an additional useful performance comparison. The Barclays Massachusetts Municipal Bond Index is a subset of the Barclays Municipal Bond Index consisting solely of bonds issued by obligors located in the commonwealth of Massachusetts. The Lipper Massachusetts Municipal Debt Funds Classification is a calculation of average total returns of mutual funds that generally limit assets to those securities that pay interest exempt from U.S. federal and Massachusetts state income taxes.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Massachusetts Tax-Exempt Fund) | Barclays Massachusetts Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.03%

5 Years

rr_AverageAnnualReturnYear05

5.96%

10 Years

rr_AverageAnnualReturnYear10

5.11%

(Columbia Massachusetts Tax-Exempt Fund) | Lipper Massachusetts Municipal Debt Funds Classification (reflects no deductions for taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.70%

5 Years

rr_AverageAnnualReturnYear05

5.07%

10 Years

rr_AverageAnnualReturnYear10

4.42%

(Columbia Massachusetts Tax-Exempt Fund) | Barclays Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.78%

5 Years

rr_AverageAnnualReturnYear05

5.91%

10 Years

rr_AverageAnnualReturnYear10

5.10%

(Columbia Massachusetts Tax-Exempt Fund) | Class A Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.02%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[18]

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

rr_NetExpensesOverAssets

0.84%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

557

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

767

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

995

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,648

Annual Return 2003

rr_AnnualReturn2003

5.94%

Annual Return 2004

rr_AnnualReturn2004

3.70%

Annual Return 2005

rr_AnnualReturn2005

3.16%

Annual Return 2006

rr_AnnualReturn2006

4.57%

Annual Return 2007

rr_AnnualReturn2007

2.30%

Annual Return 2008

rr_AnnualReturn2008

(4.32%)

Annual Return 2009

rr_AnnualReturn2009

13.33%

Annual Return 2010

rr_AnnualReturn2010

0.81%

Annual Return 2011

rr_AnnualReturn2011

12.21%

Annual Return 2012

rr_AnnualReturn2012

6.99%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.63%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(6.23%)

1 Year

rr_AverageAnnualReturnYear01

1.90%

5 Years

rr_AverageAnnualReturnYear05

4.58%

10 Years

rr_AverageAnnualReturnYear10

4.24%

(Columbia Massachusetts Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.74%

5 Years

rr_AverageAnnualReturnYear05

4.46%

10 Years

rr_AverageAnnualReturnYear10

4.10%

(Columbia Massachusetts Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.74%

5 Years

rr_AverageAnnualReturnYear05

4.47%

10 Years

rr_AverageAnnualReturnYear10

4.16%

(Columbia Massachusetts Tax-Exempt Fund) | Class B Shares

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%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.77%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[18]

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

rr_NetExpensesOverAssets

1.59%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

662

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

840

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,143

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,871

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

162

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

540

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

943

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,871

1 Year

rr_AverageAnnualReturnYear01

1.19%

5 Years

rr_AverageAnnualReturnYear05

4.47%

10 Years

rr_AverageAnnualReturnYear10

3.97%

(Columbia Massachusetts Tax-Exempt Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.77%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[18]

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

rr_NetExpensesOverAssets

1.59%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

262

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

540

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

943

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,069

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

162

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

540

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

943

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,069

1 Year

rr_AverageAnnualReturnYear01

5.51%

5 Years

rr_AverageAnnualReturnYear05

5.12%

10 Years

rr_AverageAnnualReturnYear10

4.29%

(Columbia Massachusetts Tax-Exempt Fund) | Class Z Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.30%

^[6]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.77%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[18]

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

rr_NetExpensesOverAssets

0.59%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

228

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

410

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

937

1 Year

rr_AverageAnnualReturnYear01

7.27%

5 Years

rr_AverageAnnualReturnYear05

5.66%

10 Years

rr_AverageAnnualReturnYear10

4.79%

(Columbia New York Intermediate Municipal Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks as high a level of current interest income exempt from federal income tax and, to the extent possible, from New York individual income tax, as is consistent with relative stability of principal.

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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 20 of this prospectus and in Appendix S to the Statement of Additional Information 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

7.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C, Class R4, Class T or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal securities that pay interest exempt from federal income tax (including the federal alternative minimum tax) and New York individual income tax. These securities are issued by the State of New York and its political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund normally invests at least 80% of its total assets in municipal securities that, at the time of purchase, are rated investment grade or are unrated but determined to be of comparable quality. Under normal circumstances, the Fund's dollar-weighted average maturity will be between three and ten years. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

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. Class Z share performance is shown in the bar chart because Class Z shares have been outstanding as long as any other share class of the Fund. Class R4 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for this class is not yet available. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), this class of shares would have annual returns substantially similar to those of Class Z shares, because all classes of the Fund's shares invest in the same portfolio of securities.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    5.90%

Worst:   4th quarter 2010:   -3.51%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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 Z shares and will vary for other share classes.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of the Barclays 3-15 Year Blend Municipal Bond Index, which tracks the performance of municipal bonds issued after December 31, 1990 with remaining maturities between 2 and 17 years and at least $7 million in principal amount outstanding, and the Barclays New York 3-15 Year Blend Municipal Bond Index, which tracks investment grade bonds from the state of New York and its municipalities.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia New York Intermediate Municipal Bond Fund) | Barclays 3-15 Year Blend Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.15%

5 Years

rr_AverageAnnualReturnYear05

5.88%

10 Years

rr_AverageAnnualReturnYear10

4.91%

(Columbia New York Intermediate Municipal Bond Fund) | Barclays New York 3-15 Year Blend Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.54%

5 Years

rr_AverageAnnualReturnYear05

5.74%

10 Years

rr_AverageAnnualReturnYear10

4.86%

(Columbia New York Intermediate Municipal Bond Fund) | Class A Shares

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.25%

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.28%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.00%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[19]

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

rr_NetExpensesOverAssets

0.75%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

399

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

609

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

836

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,488

1 Year

rr_AverageAnnualReturnYear01

0.86%

5 Years

rr_AverageAnnualReturnYear05

4.13%

10 Years

rr_AverageAnnualReturnYear10

3.32%

(Columbia New York Intermediate Municipal Bond Fund) | Class B Shares

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

3.00%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.28%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.75%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[19]

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

rr_NetExpensesOverAssets

1.50%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

453

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

727

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

926

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,843

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

153

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

527

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

926

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,843

1 Year

rr_AverageAnnualReturnYear01

0.43%

5 Years

rr_AverageAnnualReturnYear05

4.04%

10 Years

rr_AverageAnnualReturnYear10

3.05%

(Columbia New York Intermediate Municipal Bond Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.28%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.75%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[19]

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

rr_NetExpensesOverAssets

1.50%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

253

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

527

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

926

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,042

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

153

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

527

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

926

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,042

1 Year

rr_AverageAnnualReturnYear01

2.81%

5 Years

rr_AverageAnnualReturnYear05

4.40%

10 Years

rr_AverageAnnualReturnYear10

3.40%

(Columbia New York Intermediate Municipal Bond Fund) | Class R4 Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.28%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.75%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[19]

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

rr_NetExpensesOverAssets

0.50%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

215

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

392

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

907

(Columbia New York Intermediate Municipal Bond Fund) | Class T Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.43%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.90%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[19]

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

rr_NetExpensesOverAssets

0.65%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

538

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

725

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

926

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,508

1 Year

rr_AverageAnnualReturnYear01

(0.59%)

5 Years

rr_AverageAnnualReturnYear05

3.91%

10 Years

rr_AverageAnnualReturnYear10

3.42%

(Columbia New York Intermediate Municipal Bond Fund) | Class Z Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.28%

^[5]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.75%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[19]

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

rr_NetExpensesOverAssets

0.50%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

215

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

392

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

907

Annual Return 2003

rr_AnnualReturn2003

4.58%

Annual Return 2004

rr_AnnualReturn2004

2.70%

Annual Return 2005

rr_AnnualReturn2005

1.76%

Annual Return 2006

rr_AnnualReturn2006

3.25%

Annual Return 2007

rr_AnnualReturn2007

3.21%

Annual Return 2008

rr_AnnualReturn2008

(0.09%)

Annual Return 2009

rr_AnnualReturn2009

10.06%

Annual Return 2010

rr_AnnualReturn2010

2.28%

Annual Return 2011

rr_AnnualReturn2011

9.05%

Annual Return 2012

rr_AnnualReturn2012

4.49%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

5.90%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.51%)

1 Year

rr_AverageAnnualReturnYear01

4.49%

5 Years

rr_AverageAnnualReturnYear05

5.09%

10 Years

rr_AverageAnnualReturnYear10

4.09%

(Columbia New York Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.49%

5 Years

rr_AverageAnnualReturnYear05

5.09%

10 Years

rr_AverageAnnualReturnYear10

4.08%

(Columbia New York Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.07%

5 Years

rr_AverageAnnualReturnYear05

4.88%

10 Years

rr_AverageAnnualReturnYear10

4.00%

(Columbia New York Tax-Exempt Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks total return, consisting of current income exempt from federal income tax and New York individual income tax and of capital appreciation, consistent with moderate fluctuation of principal.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

24.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C, Class R4, Class R5 or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal bonds that pay interest exempt from federal income tax (including the federal alternative minimum tax) and New York individual income tax. These securities are issued by the State of New York and its political subdivisions, agencies, authorities and instrumentalities, by other qualified issuers and by mutual funds that invest in such securities. The Fund may invest up to 20% of its net assets in securities that pay interest subject to taxation. The Fund may invest in bonds of any maturity. Qualified issuers include issuers located in U.S. territories Guam, Puerto Rico and the U.S. Virgin Islands.

The Fund may invest in derivatives, including futures, such as exchange-traded futures contracts, primarily for hedging purposes.

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Zero-Coupon Bonds Risk – Zero-coupon bonds are bonds that do not pay interest in cash on a current basis, but instead accrue interest over the life of the bond. As a result, these securities are issued at a discount and their values may fluctuate more than the values of similar securities that pay interest periodically. Although these securities pay no interest to holders prior to maturity, interest accrued on these securities is reported as income to the Fund and affects the amounts distributed to its shareholders.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Derivatives Risk – Derivatives are financial contracts whose values are, for example, based on (or "derived" from) traditional securities (such as a stock or bond), assets (such as a commodity like gold or a foreign currency), reference rates (such as LIBOR) or market indices (such as the Standard & Poor's (S&P) 500® Index). Derivatives involve special risks and may result in losses or may limit the Fund's potential gain from favorable market movements. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security or other asset. The values of derivatives may move in unexpected ways, especially in unusual market conditions, and may result in increased volatility, among other consequences. The use of derivatives may also increase the amount of taxes payable by shareholders holding shares in a taxable account. Other risks arise from the Fund's potential inability to terminate or to sell derivative positions. A liquid secondary market may not always exist for the Fund's derivative positions at times when the Fund might wish to terminate or to sell such positions. Over-the-counter instruments (investments not traded on an exchange) may be illiquid, and transactions in derivatives traded in the over-the-counter market are subject to the risk that the other party will not meet its obligations. The use of derivatives also involves the risks of mispricing or improper valuation and that changes in the value of the derivative may not correlate perfectly with the underlying security, asset, reference rate or index. The Fund also may not be able to find a suitable derivative transaction counterparty, and thus may be unable to engage in derivative transactions when it is deemed favorable to do so, or at all. U.S. federal legislation has recently been enacted that provides for new clearing, margin, reporting and registration requirements for participants in the derivatives market. While the ultimate impact is not yet clear, these changes could restrict and/or impose significant costs or other burdens upon the Fund's participation in derivatives transactions. For more information on the risks of derivative investments and strategies, see the Statement of Additional Information.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Bar Chart and Performance Table [Heading]

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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. Class A share performance (without sales charges) is shown in the bar chart because Class A is the oldest share class of the Fund. The inception date for the Fund's Class Z shares is September 1, 2011 and the inception date for the Fund's Class R5 shares is November 8, 2012. The returns shown for Class Z shares and Class R5 shares include the returns for the Fund's Class A shares (without sales charges) for periods prior to its inception date. The Fund's Class R4 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for Class R4 shares is not yet available. Except for differences in expenses and sales charges (where applicable), these classes of shares would have annual returns substantially similar to those of Class A shares, because all classes of the Fund's shares invest in the same portfolio of securities. The returns shown for Class Z and Class R5 shares have not been adjusted to reflect any differences in expenses between such shares and Class A shares.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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 Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    9.75%

Worst:   4th quarter 2010:   -5.91%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-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

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of the Barclays Municipal Bond Index, the Barclays New York Municipal Bond Index and the Lipper New York Municipal Debt Funds Classification. The Barclays Municipal Bond Index, the Fund's primary benchmark, is considered representative of the broad market for investment-grade, tax-exempt bonds with maturity of at least one year. The Fund also measures itself against the Barclays New York Municipal Bond Index, as a secondary benchmark, because the Investment Manager believes that the additional index provides a reasonable view of the available municipal investment opportunities in New York and therefore provides an additional useful performance comparison. The Barclays New York Municipal Bond Index is a subset of the Barclays Municipal Bond Index consisting solely of bonds issued by obligors located in the state of New York. The Lipper New York Municipal Debt Funds Classification is a calculation of average total returns of mutual funds that generally limit assets to those securities that pay interest exempt from U.S. federal and New York state income taxes.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia New York Tax-Exempt Fund) | Barclays New York Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.21%

5 Years

rr_AverageAnnualReturnYear05

5.78%

10 Years

rr_AverageAnnualReturnYear10

5.01%

(Columbia New York Tax-Exempt Fund) | Lipper New York Municipal Debt Funds Classification (reflects no deductions for taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.87%

5 Years

rr_AverageAnnualReturnYear05

5.10%

10 Years

rr_AverageAnnualReturnYear10

4.37%

(Columbia New York Tax-Exempt Fund) | Barclays Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.78%

5 Years

rr_AverageAnnualReturnYear05

5.91%

10 Years

rr_AverageAnnualReturnYear10

5.10%

(Columbia New York Tax-Exempt Fund) | Class A Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.23%

^[8]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.95%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[20]

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

rr_NetExpensesOverAssets

0.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

551

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

747

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

960

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,571

Annual Return 2003

rr_AnnualReturn2003

6.31%

Annual Return 2004

rr_AnnualReturn2004

3.78%

Annual Return 2005

rr_AnnualReturn2005

2.92%

Annual Return 2006

rr_AnnualReturn2006

4.46%

Annual Return 2007

rr_AnnualReturn2007

2.02%

Annual Return 2008

rr_AnnualReturn2008

(8.72%)

Annual Return 2009

rr_AnnualReturn2009

19.57%

Annual Return 2010

rr_AnnualReturn2010

1.37%

Annual Return 2011

rr_AnnualReturn2011

11.92%

Annual Return 2012

rr_AnnualReturn2012

8.73%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.75%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.91%)

1 Year

rr_AverageAnnualReturnYear01

3.53%

5 Years

rr_AverageAnnualReturnYear05

5.10%

10 Years

rr_AverageAnnualReturnYear10

4.50%

(Columbia New York Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.42%

5 Years

rr_AverageAnnualReturnYear05

4.94%

10 Years

rr_AverageAnnualReturnYear10

4.37%

(Columbia New York Tax-Exempt Fund) | Class A Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.64%

5 Years

rr_AverageAnnualReturnYear05

4.91%

10 Years

rr_AverageAnnualReturnYear10

4.39%

(Columbia New York Tax-Exempt Fund) | Class B Shares

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%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.23%

^[8]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.70%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[20]

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

rr_NetExpensesOverAssets

1.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

656

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

819

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,107

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,795

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

156

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

519

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

907

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,795

1 Year

rr_AverageAnnualReturnYear01

2.77%

5 Years

rr_AverageAnnualReturnYear05

4.98%

10 Years

rr_AverageAnnualReturnYear10

4.21%

(Columbia New York Tax-Exempt Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.23%

^[8]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.70%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[20]

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

rr_NetExpensesOverAssets

1.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

256

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

519

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

907

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,994

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

156

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

519

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

907

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,994

1 Year

rr_AverageAnnualReturnYear01

7.10%

5 Years

rr_AverageAnnualReturnYear05

5.63%

10 Years

rr_AverageAnnualReturnYear10

4.52%

(Columbia New York Tax-Exempt Fund) | Class R4 Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.23%

^[8]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.70%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[20]

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

rr_NetExpensesOverAssets

0.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

207

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

373

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

855

(Columbia New York Tax-Exempt Fund) | Class R5 Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.16%

^[8]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.63%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.14%)

^[20]

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

rr_NetExpensesOverAssets

0.49%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

188

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

337

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

773

1 Year

rr_AverageAnnualReturnYear01

8.76%

5 Years

rr_AverageAnnualReturnYear05

6.14%

10 Years

rr_AverageAnnualReturnYear10

5.01%

(Columbia New York Tax-Exempt Fund) | Class Z Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.23%

^[8]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.70%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.17%)

^[20]

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

rr_NetExpensesOverAssets

0.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

207

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

373

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

855

1 Year

rr_AverageAnnualReturnYear01

8.87%

5 Years

rr_AverageAnnualReturnYear05

6.17%

10 Years

rr_AverageAnnualReturnYear10

5.02%

(Columbia Strategic Income Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

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 your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds. More information about these and other discounts is available from your financial advisor, in the Choosing a Share Class section beginning on page 22 of this prospectus and in Appendix S to the Statement of Additional Information 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 pays 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 period, the Fund's fiscal year end changed from May 31 to October 31. For the fiscal period from June 1, 2012 to October 31, 2012, the Fund's portfolio turnover rate was 48% of the average value of its portfolio (25% excluding mortgage dollar rolls) and for the prior fiscal year ended May 31, 2012, the Fund's portfolio turnover rate was 83% of the average value of its portfolio (63% excluding mortgage dollar rolls).

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

48.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible Columbia Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 Class A, Class B, Class C, Class K, Class R, Class R4, Class R5, Class W or Class Z shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests primarily in debt securities in the following three segments of the debt securities market: (i) securities issued by the U.S. Government and its agencies, including mortgage- and other asset-backed securities; (ii) securities issued by foreign governments, companies or other entities, including in emerging market countries and non-dollar denominated securities; and (iii) below investment grade corporate debt securities or unrated corporate debt securities determined to be of comparable quality, which are commonly referred to as "junk bonds."

The Fund also may participate in mortgage dollar rolls up to the Fund's then current position in mortgage-backed securities.

Columbia Management Investment Advisers, LLC, the Fund's investment adviser (the Investment Manager), evaluates a number of factors in identifying investment opportunities and constructing the Fund's portfolio. The Investment Manager considers local, national and global economic conditions, market conditions, interest rate movements and other relevant factors to determine the allocation of the Fund's assets among different issuers, industry sectors and maturities.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Foreign Securities Risk – Foreign securities are subject to special risks as compared to securities of U.S. issuers. For example, foreign markets can be extremely volatile. Fluctuations in currency exchange rates may impact the value of foreign securities denominated in foreign currencies, or in U.S. dollars, without a change in the intrinsic value of those securities. Foreign securities may be less liquid than domestic securities so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial fees and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose potentially confiscatory withholding or other taxes, which could reduce the amount of income and capital gains available to distribute to shareholders. Other risks include possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about companies; the impact of political, social or diplomatic events; possible seizure, expropriation or nationalization of a company or its assets; possible imposition of currency exchange controls; and accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies.

Currency Risk – Securities denominated in non-U.S. dollar currencies are subject to the risk that, for example, if the value of a foreign currency were to decline against the U.S. dollar, such decline would reduce the U.S. dollar value of any securities held by the Fund denominated in that currency.

Emerging Market Securities Risk – Securities issued by foreign governments or companies in emerging market countries, like Russia and those 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 social, political and economic development. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity 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, which makes them more sensitive to world commodity prices and economic downturns in other countries. Some emerging market countries have a higher risk of currency devaluations, and some of these countries may experience periods of high inflation or rapid changes in inflation rates.

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 may 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. For example, securities issued by the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association and the Federal Home Loan Banks are neither insured nor guaranteed by the U.S. Government. These securities may be supported by the ability to borrow from the U.S. Treasury or only by the credit of the issuing agency, authority, instrumentality or enterprise and, as a result, are subject to greater credit risk than securities issued or guaranteed by the U.S. Treasury.

Mortgage-Backed Securities Risk – The value of the Fund's mortgage-backed securities 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, 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. Mortgage-backed securities represent interests in, or are backed by, pools of mortgages from which payments of interest and principal (net of fees paid to the issuer or guarantor of the securities) are distributed to the holders of the mortgage-backed securities. Mortgage-backed securities can have a fixed or an adjustable rate. Payment of principal and interest on some mortgage-backed securities (but not the market value of the securities themselves) may be guaranteed (i) by the full faith and credit of the U.S. Government (in the case of securities guaranteed by the Government National Mortgage Association) or (ii) by its agencies, authorities, enterprises or instrumentalities (in the case of securities guaranteed by the Federal National Mortgage Association (FNMA) or the Federal Home Loan Mortgage Corporation (FHLMC)), which are not insured or guaranteed by the U.S. Government (although FNMA and FHLMC may be able to access capital from the U.S. Treasury to meet their obligations under such securities). 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 be supported by various credit enhancements, such as pool insurance, guarantees issued by governmental entities, letters of credit from a bank or senior/subordinated structures, and may entail greater risk than obligations guaranteed by the U.S. Government, whether or not such obligations are guaranteed by the private issuer. Mortgage-backed securities are subject to prepayment risk, which is the possibility that the underlying mortgage 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. In addition, the impact of prepayments on the value of mortgage-backed securities may be difficult to predict and may result in greater volatility. Rising or high interest rates tend to extend the duration of mortgage-backed securities, making them more volatile and more sensitive to changes in interest rates.

Asset-Backed Securities Risk – The value of the Fund's asset-backed securities may be affected by, among other things, changes in: interest rates, factors concerning the interests in and structure of the issuer or the originator of the receivables, 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. Asset-backed securities represent interests in, or are backed by, pools of receivables such as credit card, auto, student and home equity loans. They may also be backed, in turn, by securities backed by these types of loans and others, such as mortgage loans. Asset-backed securities can have a fixed or an adjustable rate. Most asset-backed securities are subject to prepayment risk, which is the possibility that the underlying debt 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. In addition, the impact of prepayments on the value of asset-backed securities may be difficult to predict and may result in greater volatility. Rising or high interest rates tend to extend the duration of asset-backed securities, making them more volatile and more sensitive to changes in interest rates.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Dollar Rolls Risk – Dollar rolls 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).

Derivatives Risk – Derivatives are financial contracts whose values are, for example, based on (or "derived" from) traditional securities (such as a stock or bond), assets (such as a commodity like gold or a foreign currency), reference rates (such as LIBOR) or market indices (such as the Standard & Poor's (S&P) 500® Index). Derivatives involve special risks and may result in losses or may limit the Fund's potential gain from favorable market movements. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security or other asset. The values of derivatives may move in unexpected ways, especially in unusual market conditions, and may result in increased volatility, among other consequences. The use of derivatives may also increase the amount of taxes payable by shareholders holding shares in a taxable account. Other risks arise from the Fund's potential inability to terminate or to sell derivative positions. A liquid secondary market may not always exist for the Fund's derivative positions at times when the Fund might wish to terminate or to sell such positions. Over-the-counter instruments (investments not traded on an exchange) may be illiquid, and transactions in derivatives traded in the over-the-counter market are subject to the risk that the other party will not meet its obligations. The use of derivatives also involves the risks of mispricing or improper valuation and that changes in the value of the derivative may not correlate perfectly with the underlying security, asset, reference rate or index. The Fund also may not be able to find a suitable derivative transaction counterparty, and thus may be unable to engage in derivative transactions when it is deemed favorable to do so, or at all. U.S. federal legislation has recently been enacted that provides for new clearing, margin, reporting and registration requirements for participants in the derivatives market. While the ultimate impact is not yet clear, these changes could restrict and/or impose significant costs or other burdens upon the Fund's participation in derivatives transactions. For more information on the risks of derivative investments and strategies, see the Statement of Additional Information.

Derivatives Risk – Forward Foreign Currency Contracts – The Fund may enter into forward foreign currency contracts, which are a type of derivative contract, whereby the Fund may agree to buy or sell a country's currency at a specific price on a specific date, usually 30, 60, or 90 days in the future. These currency contracts may change in value due to foreign market fluctuations or foreign currency value fluctuations. The effectiveness of any currency hedging strategy by a Fund may be reduced by the Fund's inability to precisely match forward contract amounts and the value of securities involved. Forward foreign currency contracts used for hedging may also limit any potential gain that might result from an increase or decrease in the value of the currency. When entering into forward foreign currency contracts for investment purposes, unanticipated changes in the currency markets could result in reduced performance for the Fund. At or prior to maturity of a forward contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been movement in forward contract prices. When the Fund converts its foreign currencies into U.S. dollars it may incur currency conversion costs due to the spread between the prices at which it may buy and sell various currencies in the market.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

Derivatives Risk — Credit Default Swaps – The Fund may enter into credit default swaps for investment purposes, for risk management (hedging) purposes, and to increase investment flexibility. 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 subject the Fund to the risk that the counterparty to the instrument will not perform or will be unable to perform in accordance with the terms of the instrument, and pricing risk (i.e., swaps may be difficult to value). In addition, it may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses. 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 - Options – The use of options is a highly specialized activity which involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The Fund may buy and sell call and put options. 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. Options may be traded on a securities exchange or in the over-the-counter market. These transactions involve other risks, including counterparty risk (i.e., the counterparty to the instrument will not perform or be able to perform in accordance with the terms of the instrument) and hedging risk (i.e., a hedging strategy may not eliminate the risk that it is intended to offset, and may offset gains, which may lead to losses within the Fund).

Liquidity Risk – Illiquid securities are securities that cannot be readily disposed of in the normal course of business. There is a risk that the Fund may not be able to sell such securities at the time it desires or without adversely affecting their price.

Rule 144A Securities Risk — The Fund may invest in privately placed securities that have not been registered for sale under the Securities Act of 1933 pursuant to Rule 144A (Rule 144A securities) that are determined to be liquid in accordance with procedures adopted by the Fund's Board of Trustees. 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. The Fund may also have to bear the expense of registering the securities for resale and the risk of substantial delays in effecting the registration. Additionally, the purchase price and subsequent valuation of restricted and illiquid securities normally reflect a discount, which may be significant, from the market price of comparable securities for which a more liquid market exists.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Bar Chart and Performance Table [Heading]

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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. Class A share performance (without sales charge) is shown in the bar chart because Class A is the oldest share class of the Fund. The inception date for the Fund's Class K and Class R5 shares is March 7, 2011; the inception date for the Fund's Class R and Class W shares is September 27, 2010; and the inception date for the Fund's Class R4 shares is November 8, 2012. The returns shown for each of these classes of shares include the returns of the Fund's Class A shares (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 expenses and sales charges (where applicable), these classes of shares would have annual returns substantially similar to those of Class A shares, because all classes of the Fund's shares invest in the same portfolio of securities.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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 Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Returns During this Period

Best:     3rd quarter 2009:     7.71%

Worst:    4th quarter 2008:    -3.89%

Performance Table Heading

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Average Annual Total Return as of December 31, 2012

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

Performance Table Not Relevant to Tax Deferred

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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]

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

Performance Table Narrative

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The table compares the Fund's returns for each period with those of the Fund's primary benchmark, the Barclays U.S. Government/Credit Bond Index, which tracks the performance of U.S. government and corporate bonds rated investment grade or better, with maturities of at least one year. Effective on February 29, 2012, the Fund changed its blended benchmark because the Investment Manager believes it is more consistent with the Fund's investment strategy. The table compares the Fund's returns to a Blended Benchmark, a weighted custom composite, established by the Investment Manager, consisting of a 35% weighting of the Barclays U.S. Aggregate Bond Index, a 35% weighting of the Bank of America Merrill Lynch (BofAML) US High Yield Cash Pay Constrained Index, a 15% weighting of the Citigroup Non-U.S. World Government Bond (All Maturities) Index – Unhedged (Citigroup Non-U.S. WGBI - Unhedged) and a 15% weighting of the JPMorgan Emerging Markets Bond Index (EMBI) – Global. The Barclays U.S. Aggregate Bond Index is a market value-weighted index that tracks the daily price, coupon, pay-downs and total return performance of fixed-rate, publicly placed, dollar-denominated and non-convertible investment grade debt issues with at least $250 million par amount outstanding and with at least one year to final maturity. The BofAML US High Yield Cash Pay Constrained Index tracks the performance of U.S. dollar-denominated below investment grade corporate debt, currently in a coupon paying period, that is publicly issued in the U.S. domestic market. The Citigroup Non-U.S. WGBI - Unhedged is calculated on a market-weighted basis and includes all fixed-rate bonds with a remaining maturity of one year or longer and with amounts outstanding of at least the equivalent of U.S. $25 million, while excluding floating or variable rate bonds. The JPMorgan EMBI – Global is based on U.S. dollar-denominated debt instruments issued by emerging market sovereign and quasi-sovereign entities, such as Brady bonds, Eurobonds and loans, and reflects reinvestment of all distributions and changes in market prices.

Performance Table Closing [Text Block]

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(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

4.82%

5 Years

rr_AverageAnnualReturnYear05

6.06%

10 Years

rr_AverageAnnualReturnYear10

5.25%

(Columbia Strategic Income Fund) | 35% Barclays Agg Bond; 35% BofA ML US High Cash; 15% Citigrp Non-US World Gov; 15% JPMorgan Emrg Mkts Bond (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.73%

5 Years

rr_AverageAnnualReturnYear05

8.17%

10 Years

rr_AverageAnnualReturnYear10

8.21%

(Columbia Strategic Income Fund) | Class A Shares

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

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.03%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

575

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

787

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,017

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,675

Annual Return 2003

rr_AnnualReturn2003

19.29%

Annual Return 2004

rr_AnnualReturn2004

10.04%

Annual Return 2005

rr_AnnualReturn2005

1.26%

Annual Return 2006

rr_AnnualReturn2006

6.76%

Annual Return 2007

rr_AnnualReturn2007

5.67%

Annual Return 2008

rr_AnnualReturn2008

(6.46%)

Annual Return 2009

rr_AnnualReturn2009

18.67%

Annual Return 2010

rr_AnnualReturn2010

9.96%

Annual Return 2011

rr_AnnualReturn2011

6.11%

Annual Return 2012

rr_AnnualReturn2012

11.60%

Highest Quarterly Return, Label

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3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.71%

Lowest Quarterly Return, Label

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4th quarter 2008:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.89%)

1 Year

rr_AverageAnnualReturnYear01

6.32%

5 Years

rr_AverageAnnualReturnYear05

6.59%

10 Years

rr_AverageAnnualReturnYear10

7.52%

(Columbia Strategic Income Fund) | Class A Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.64%

5 Years

rr_AverageAnnualReturnYear05

4.44%

10 Years

rr_AverageAnnualReturnYear10

5.14%

(Columbia Strategic Income Fund) | Class A Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.12%

5 Years

rr_AverageAnnualReturnYear05

4.33%

10 Years

rr_AverageAnnualReturnYear10

5.02%

(Columbia Strategic Income Fund) | Class B Shares

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%

^[2]

Management fees

rr_ManagementFeesOverAssets

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

681

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

860

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,164

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,897

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

181

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

560

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

964

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,897

1 Year

rr_AverageAnnualReturnYear01

5.77%

5 Years

rr_AverageAnnualReturnYear05

6.54%

10 Years

rr_AverageAnnualReturnYear10

7.26%

(Columbia Strategic Income Fund) | Class C Shares

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%

^[3]

Management fees

rr_ManagementFeesOverAssets

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

281

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

560

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

964

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,095

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

181

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

560

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

964

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,095

1 Year

rr_AverageAnnualReturnYear01

9.94%

5 Years

rr_AverageAnnualReturnYear05

7.00%

10 Years

rr_AverageAnnualReturnYear10

7.39%

(Columbia Strategic Income Fund) | Class K Shares

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

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.34%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.91%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

290

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

504

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,120

1 Year

rr_AverageAnnualReturnYear01

11.69%

5 Years

rr_AverageAnnualReturnYear05

7.69%

10 Years

rr_AverageAnnualReturnYear10

8.06%

(Columbia Strategic Income Fund) | Class R Shares

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

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.28%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

130

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

406

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

702

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,545

1 Year

rr_AverageAnnualReturnYear01

11.27%

5 Years

rr_AverageAnnualReturnYear05

7.48%

10 Years

rr_AverageAnnualReturnYear10

7.82%

(Columbia Strategic Income Fund) | Class R4 Shares

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

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

249

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

433

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

966

1 Year

rr_AverageAnnualReturnYear01

11.67%

5 Years

rr_AverageAnnualReturnYear05

7.66%

10 Years

rr_AverageAnnualReturnYear10

8.05%

(Columbia Strategic Income Fund) | Class R5 Shares

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

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.09%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.66%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

211

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

368

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

822

1 Year

rr_AverageAnnualReturnYear01

11.97%

5 Years

rr_AverageAnnualReturnYear05

7.79%

10 Years

rr_AverageAnnualReturnYear10

8.11%

(Columbia Strategic Income Fund) | Class W Shares

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

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.03%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

105

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

328

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

569

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,259

1 Year

rr_AverageAnnualReturnYear01

11.62%

5 Years

rr_AverageAnnualReturnYear05

7.66%

10 Years

rr_AverageAnnualReturnYear10

8.05%

(Columbia Strategic Income Fund) | Class Z Shares

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

0.57%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

^[9]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

249

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

433

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

966

1 Year

rr_AverageAnnualReturnYear01

11.86%

5 Years

rr_AverageAnnualReturnYear05

7.90%

10 Years

rr_AverageAnnualReturnYear10

8.32%

(Columbia Emerging Markets Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks long-term 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.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays 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 period, the Fund's fiscal year end changed from March 31 to August 31. For the fiscal period from April 1, 2012 to August 31, 2012, the Fund's portfolio turnover rate was 35% of the average value of its portfolio and for the prior fiscal year ended March 31, 2012, the Fund's portfolio turnover rate was 117% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

35.00%

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 Class R4 shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities (including, but not limited to, common stocks, preferred stocks and securities convertible into common or preferred stocks) of companies located in emerging market countries. Emerging market countries include those countries whose economies are considered to be developing or emerging from underdevelopment. The Fund may invest in a variety of countries, industries and sectors and does not attempt to invest a specific percentage of its assets in any given country, industry or sector. The Fund may invest in companies that have market capitalizations of any size.

The Fund may invest in currency forwards for hedging purposes and futures for both hedging and non-hedging purposes, including, for example, to seek to enhance returns or, in certain unusual circumstances, when holding a derivative is deemed preferable to holding the underlying asset.

The Fund may invest in special situations such as companies involved in initial public offerings, tender offers, mergers and other corporate restructurings, and in companies involved in management changes or companies developing new technologies.

The Fund may invest in securities that Columbia Management Investment Advisers, LLC, the Fund's investment adviser (the Investment Manager) believes are undervalued, represent growth opportunities, or both. The Investment Manager combines fundamental and quantitative analysis with risk management in identifying investment opportunities and constructing the Fund's portfolio. The Investment Manager considers among other factors:

various measures of valuation, including price-to-cash flow, price-to-earnings, price-to-sales, price-to-book value and discounted cash flow. The Investment Manager believes that companies with lower valuations are generally more likely to provide opportunities for capital appreciation.
potential indicators of stock price appreciation, such as anticipated earnings growth, company restructuring, changes in management, business model changes, new product opportunities, or anticipated improvements in macroeconomic factors.

the financial condition and management of a company, including its competitive position, the quality of its balance sheet and earnings, its future prospects, and the potential for growth and stock price appreciation.
overall economic and market conditions.

The Investment Manager may sell a security when the security's price reaches a target set by the Investment Manager; if the Investment Manager believes that there is deterioration in the issuer's financial circumstances or fundamental prospects, or that other investments are more attractive; or for other reasons.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Foreign Securities Risk – Foreign securities are subject to special risks as compared to securities of U.S. issuers. For example, foreign markets can be extremely volatile. Fluctuations in currency exchange rates may impact the value of foreign securities denominated in foreign currencies, or in U.S. dollars, without a change in the intrinsic value of those securities. Foreign securities may be less liquid than domestic securities so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial fees and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose potentially confiscatory withholding or other taxes, which could reduce the amount of income and capital gains available to distribute to shareholders. Other risks include possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about companies; the impact of political, social or diplomatic events; possible seizure, expropriation or nationalization of a company or its assets; possible imposition of currency exchange controls; and accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies.

Currency Risk – Securities denominated in non-U.S. dollar currencies are subject to the risk that, for example, if the value of a foreign currency were to decline against the U.S. dollar, such decline would reduce the U.S. dollar value of any securities held by the Fund denominated in that currency.

Emerging Market Securities Risk – Securities issued by foreign governments or companies in emerging market countries, like Russia and those 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 social, political and economic development. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity 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, which makes them more sensitive to world commodity prices and economic downturns in other countries. Some emerging market countries have a higher risk of currency devaluations, and some of these countries may experience periods of high inflation or rapid changes in inflation rates.

Growth Securities Risk – Because growth securities typically trade at a higher multiple of earnings than other types of securities, the market values of growth securities may be more sensitive to changes in current or expected earnings than the market values of other types of securities. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Value Securities Risk – Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet the Investment Manager's future value assessment of that security, or may decline. There is also a risk that it may take longer than expected for the value of these investments to rise to the believed value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Smaller Company Securities Risk – Securities of small- or mid-capitalization companies (smaller companies) can, in certain circumstances, have a higher potential for gains than securities of large-capitalization companies (larger companies) but may also have more risk. For example, smaller companies may be more vulnerable to market downturns and adverse business or economic events than larger, more established companies because they may have more limited financial resources and business operations. These companies are also more likely than larger companies to have more limited product lines and operating histories and to depend on smaller management teams. Their securities may trade less frequently and in smaller volumes and may be less liquid and fluctuate more sharply in value than securities of larger companies. In addition, some smaller companies may not be widely followed by the investment community, which can lower the demand for their stocks.

Special Situations Risk – Securities of companies that are involved in an initial public offering or a major corporate event, such as a business consolidation or restructuring, may present special risk because of the high degree of uncertainty that can be associated with such events. Securities issued in initial public offerings often are issued by companies that are in the early stages of development, have a history of little or no revenues and may operate at a loss following the offering. It is possible that there will be no active trading market for the securities after the offering, and that the market price of the securities may be subject to significant and unpredictable fluctuations. Investing in special situations may have a magnified effect on the performance of funds with small amounts of assets.

Derivatives Risk – Forward Foreign Currency Contracts – The Fund may enter into forward foreign currency contracts, which are a type of derivative contract, whereby the Fund may agree to buy or sell a country's currency at a specific price on a specific date, usually 30, 60, or 90 days in the future. These currency contracts may change in value due to foreign market fluctuations or foreign currency value fluctuations. The effectiveness of any currency hedging strategy by a Fund may be reduced by the Fund's inability to precisely match forward contract amounts and the value of securities involved. Forward foreign currency contracts used for hedging may also limit any potential gain that might result from an increase or decrease in the value of the currency. When entering into forward foreign currency contracts for investment purposes, unanticipated changes in the currency markets could result in reduced performance for the Fund. At or prior to maturity of a forward contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been movement in forward contract prices. When the Fund converts its foreign currencies into U.S. dollars it may incur currency conversion costs due to the spread between the prices at which it may buy and sell various currencies in the market.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

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. Class R4 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for this class is not yet available. The performance of Class Z shares, which have been outstanding longer than any other share class of the Fund, is shown in the bar chart and the average annual total return table. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), this class of shares would have annual returns substantially similar to those of Class Z shares, which are not offered in this prospectus, because all classes of the Fund's shares invest in the same portfolio of securities.

The performance shown for the Fund includes the performance of Emerging Markets Fund, the predecessor to the Fund and a series of Excelsior Funds, Inc., for periods prior to March 31, 2008.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:     2nd quarter 2009:    33.14%

Worst:    3rd quarter 2008:   -29.98%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-deferred accounts such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of the MSCI Emerging Markets Index (Net) and the MSCI Europe, Australasia and Far East (EAFE) Index (Net). The MSCI Emerging Markets Index (Net) is a free float-adjusted, market capitalization-weighted index designed to measure equity market performance of emerging markets.

The MSCI EAFE Index (Net) is also a free float-adjusted market capitalization weighted index that is designed to measure the equity market performance of developed markets, excluding the U.S. and Canada. The Fund also measures itself against the MSCI EAFE Index (Net) because the Investment Manager believes that the additional index provides a reasonable view of the equity opportunities in developed, international markets and therefore provides an additional, useful performance comparison.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Emerging Markets Fund) | MSCI Emerging Markets Index (Net) (reflects reinvested dividends net of withholding taxes but reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

18.22%

5 Years

rr_AverageAnnualReturnYear05

(0.92%)

10 Years

rr_AverageAnnualReturnYear10

16.52%

(Columbia Emerging Markets Fund) | MSCI EAFE Index (Net) (reflects reinvested dividends net of withholding taxes but reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.32%

5 Years

rr_AverageAnnualReturnYear05

(3.69%)

10 Years

rr_AverageAnnualReturnYear10

8.21%

(Columbia Emerging Markets Fund) | Class R4 Shares

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

1.35%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.48%

^[10]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.83%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.29%)

^[21]

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

rr_NetExpensesOverAssets

1.54%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

157

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

547

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

963

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,124

(Columbia Emerging Markets Fund) | Class Z Shares

Risk/Return:

rr_RiskReturnAbstract

Annual Return 2003

rr_AnnualReturn2003

63.90%

Annual Return 2004

rr_AnnualReturn2004

30.02%

Annual Return 2005

rr_AnnualReturn2005

29.09%

Annual Return 2006

rr_AnnualReturn2006

33.79%

Annual Return 2007

rr_AnnualReturn2007

26.95%

Annual Return 2008

rr_AnnualReturn2008

(55.37%)

Annual Return 2009

rr_AnnualReturn2009

76.88%

Annual Return 2010

rr_AnnualReturn2010

20.04%

Annual Return 2011

rr_AnnualReturn2011

(18.90%)

Annual Return 2012

rr_AnnualReturn2012

24.12%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

2nd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

33.14%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

3rd quarter 2008:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(29.98%)

1 Year

rr_AverageAnnualReturnYear01

24.12%

5 Years

rr_AverageAnnualReturnYear05

(0.94%)

10 Years

rr_AverageAnnualReturnYear10

16.12%

(Columbia Emerging Markets Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

23.40%

5 Years

rr_AverageAnnualReturnYear05

(2.11%)

10 Years

rr_AverageAnnualReturnYear10

15.21%

(Columbia Emerging Markets Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.92%

5 Years

rr_AverageAnnualReturnYear05

(0.85%)

10 Years

rr_AverageAnnualReturnYear10

14.67%

(Columbia Global Dividend Opportunity Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

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.

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

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

97.00%

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 Class R4 shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in income-producing (dividend-paying) equity securities of U.S. and foreign companies. Equity securities include, for example, common stock, preferred stock, convertible securities and shares of real estate investment trusts (REITs). The Fund invests principally in securities of companies that Columbia Management Investment Advisers, LLC, the Fund's investment adviser (the Investment Manager), believes are attractively valued and have the potential for long-term growth. The Fund may invest in companies that have market capitalizations of any size.

Under normal circumstances, the Fund will invest at least 40% of its net assets in foreign securities, including securities of companies in emerging market countries. The Fund may invest directly in foreign securities or indirectly through depositary receipts. Depositary receipts are receipts issued by a bank or trust company and evidence ownership of underlying securities issued by foreign companies.

In pursuit of the Fund's objectives, the Investment Manager chooses investments by applying quantitative screens to determine yield potential. The Investment Manager conducts fundamental research on and seeks to purchase potentially attractive securities based on its analysis of various factors, which may include one or more of the following, as well as other, statistical measures:

Current yield.
Dividend growth capability (considering a company's financial statements and management's ability to increase the dividend if it chooses to do so) and dividend history.
Balance sheet strength.
Earnings per share and free cash flow sustainability.
Dividend payout ratio.

Preference is generally given to higher dividend paying companies.

The Investment Manager monitors holding periods, tax qualification and transaction costs with regard to tax consequences.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Quantitative Model Risk – The Fund may use quantitative methods to select investments. Securities or other investments selected using quantitative methods may perform differently from the market as a whole or from their expected performance for many reasons, including factors used in building the quantitative analytical framework, the weights placed on each factor, and changing sources of market returns, among others. Any errors or imperfections in the quantitative analyses or models, or in the data on which they are based, could adversely affect the ability to use such analyses or models effectively, which in turn could adversely affect the Fund's performance. There can be no assurance that these methodologies will help the Fund to achieve its objective.

Value Securities Risk – Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet the Investment Manager's future value assessment of that security, or may decline. There is also a risk that it may take longer than expected for the value of these investments to rise to the believed value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Growth Securities Risk – Because growth securities typically trade at a higher multiple of earnings than other types of securities, the market values of growth securities may be more sensitive to changes in current or expected earnings than the market values of other types of securities. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Smaller Company Securities Risk – Securities of small- or mid-capitalization companies (smaller companies) can, in certain circumstances, have a higher potential for gains than securities of large-capitalization companies (larger companies) but may also have more risk. For example, smaller companies may be more vulnerable to market downturns and adverse business or economic events than larger, more established companies because they may have more limited financial resources and business operations. These companies are also more likely than larger companies to have more limited product lines and operating histories and to depend on smaller management teams. Their securities may trade less frequently and in smaller volumes and may be less liquid and fluctuate more sharply in value than securities of larger companies. In addition, some smaller companies may not be widely followed by the investment community, which can lower the demand for their stocks.

Foreign Securities Risk – Foreign securities are subject to special risks as compared to securities of U.S. issuers. For example, foreign markets can be extremely volatile. Fluctuations in currency exchange rates may impact the value of foreign securities denominated in foreign currencies, or in U.S. dollars, without a change in the intrinsic value of those securities. Foreign securities may be less liquid than domestic securities so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial fees and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose potentially confiscatory withholding or other taxes, which could reduce the amount of income and capital gains available to distribute to shareholders. Other risks include possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about companies; the impact of political, social or diplomatic events; possible seizure, expropriation or nationalization of a company or its assets; possible imposition of currency exchange controls; and accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies.

Emerging Market Securities Risk – Securities issued by foreign governments or companies in emerging market countries, like Russia and those 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 social, political and economic development. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity 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, which makes them more sensitive to world commodity prices and economic downturns in other countries. Some emerging market countries have a higher risk of currency devaluations, and some of these countries may experience periods of high inflation or rapid changes in inflation rates.

Currency Risk – Securities denominated in non-U.S. dollar currencies are subject to the risk that, for example, if the value of a foreign currency were to decline against the U.S. dollar, such decline would reduce the U.S. dollar value of any securities held by the Fund denominated in that currency.

Depositary Receipts Risk – Some foreign securities are traded in the form of American Depositary Receipts (ADRs). Depositary receipts involve the risks of other investments in foreign securities, including risks associated with investing in the particular country, including the political, regulatory, economic, social and other conditions or events occurring in the country, as well as fluctuations in its currency. In addition, ADR holders may not have all the legal rights of shareholders and may experience difficulty in receiving shareholder communications.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Sector Risk – At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a broadly related group of industries within an economic sector. Companies in the same economic sector may be similarly affected by economic or market events, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly.

Real Estate Investment Trusts Risk – Real estate investment trusts (REITs) are entities that either own properties or make construction or mortgage loans, and also may include operating or finance companies. The value of REIT shares is affected by, among other factors, changes in the value of the underlying properties owned by the REIT and/or by changes in the prospect for earnings and/or cash flow growth of the REIT itself. In addition, certain of the risks associated with general real estate ownership apply to the Fund's REIT investments, including risks related to general and local economic conditions, possible lack of availability of financing and changes in interest rates.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    2nd quarter 2003:    19.81%

Worst:   4th quarter 2008:   -25.00%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-deferred accounts such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of its primary benchmark, the MSCI All Country World Index, which tracks the equity market performance of developed and emerging markets. The Fund changed its benchmark effective August 17, 2012 because the new benchmark is more consistent with the changes in the Fund's principal investment strategies that became effective on such date. Previously, the table compared the Fund's returns for each period with those of the Russell 1000 Index, an index that measures the performance of the 1,000 largest U.S. companies and represents approximately 90% of the U.S. equity market.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Global Dividend Opportunity Fund) | Russell 1000 Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.42%

5 Years

rr_AverageAnnualReturnYear05

1.92%

10 Years

rr_AverageAnnualReturnYear10

7.52%

(Columbia Global Dividend Opportunity Fund) | MSCI All Country World Index (Net) (reflects reinvested dividends net of withholding taxes but reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.13%

5 Years

rr_AverageAnnualReturnYear05

(1.16%)

10 Years

rr_AverageAnnualReturnYear10

8.11%

(Columbia Global Dividend Opportunity Fund) | Class R4 Shares

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

0.75%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.26%

^[11]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

103

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

322

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

558

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,236

(Columbia Global Dividend Opportunity Fund) | Class Z Shares

Risk/Return:

rr_RiskReturnAbstract

Annual Return 2003

rr_AnnualReturn2003

36.45%

Annual Return 2004

rr_AnnualReturn2004

15.70%

Annual Return 2005

rr_AnnualReturn2005

7.38%

Annual Return 2006

rr_AnnualReturn2006

14.58%

Annual Return 2007

rr_AnnualReturn2007

14.77%

Annual Return 2008

rr_AnnualReturn2008

(41.51%)

Annual Return 2009

rr_AnnualReturn2009

37.14%

Annual Return 2010

rr_AnnualReturn2010

17.25%

Annual Return 2011

rr_AnnualReturn2011

(8.89%)

Annual Return 2012

rr_AnnualReturn2012

17.19%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

2nd quarter 2003:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.81%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2008:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.00%)

1 Year

rr_AverageAnnualReturnYear01

17.19%

5 Years

rr_AverageAnnualReturnYear05

0.08%

10 Years

rr_AverageAnnualReturnYear10

8.39%

(Columbia Global Dividend Opportunity Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.64%

5 Years

rr_AverageAnnualReturnYear05

(0.25%)

10 Years

rr_AverageAnnualReturnYear10

7.64%

(Columbia Global Dividend Opportunity Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.21%

5 Years

rr_AverageAnnualReturnYear05

0.05%

10 Years

rr_AverageAnnualReturnYear10

7.34%

(Columbia Greater China Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks long-term 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.

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

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

38.00%

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 Class R4 shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities of companies whose principal activities are located in the Greater China region. The Greater China region includes Hong Kong, The People's Republic of China, Taiwan and certain other countries. Columbia Management Investment Advisers, LLC, the Fund's investment adviser (the Investment Manager), will determine if a company's principal activities are located in the Greater China region by considering the company's country of organization, its primary stock exchange listing, the source of its revenues, the location of its assets and other factors.

The Fund may invest in companies that have market capitalizations of any size that the Investment Manager believes are undervalued or have the potential for long-term growth.

The Fund is non-diversified, which means that it can invest a greater percentage of its assets in a single issuer than can a diversified fund.

The Investment Manager combines fundamental and quantitative analysis with risk management in identifying investment opportunities and constructing the Fund's portfolio. The Investment Manager considers, among other factors:

various measures of valuation, including price-to-cash flow, price-to-earnings, price-to-sales, and price-to-book value. The Investment Manager believes that companies with lower valuations are generally more likely to provide opportunities for capital appreciation.
potential indicators of stock price appreciation, such as anticipated earnings growth, company restructuring, changes in management, business model changes, new product opportunities, or anticipated improvements in macroeconomic factors.
the financial condition and management of a company, including its competitive position, the quality of its balance sheet and earnings, its future prospects, and the potential for growth and stock price appreciation.
overall economic and market conditions.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Greater China Regional Risk – The Greater China region consists of Hong Kong, The People's Republic of China and Taiwan, among other countries, and the Fund's investments in the region are particularly susceptible to risks in that region. Events in any one country within the region may impact the other countries in the region or the Asia region as a whole. As a result, events in the region will generally have a greater effect on the Fund than if the Fund were more geographically diversified, which could result in greater volatility and losses. Markets in the Greater China region can experience significant volatility due to social, regulatory and political uncertainties.

Foreign Securities Risk – Foreign securities are subject to special risks as compared to securities of U.S. issuers. For example, foreign markets can be extremely volatile. Fluctuations in currency exchange rates may impact the value of foreign securities denominated in foreign currencies, or in U.S. dollars, without a change in the intrinsic value of those securities. Foreign securities may be less liquid than domestic securities so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial fees and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose potentially confiscatory withholding or other taxes, which could reduce the amount of income and capital gains available to distribute to shareholders. Other risks include possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about companies; the impact of political, social or diplomatic events; possible seizure, expropriation or nationalization of a company or its assets; possible imposition of currency exchange controls; and accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies.

Growth Securities Risk – Because growth securities typically trade at a higher multiple of earnings than other types of securities, the market values of growth securities may be more sensitive to changes in current or expected earnings than the market values of other types of securities. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Value Securities Risk – Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet the Investment Manager's future value assessment of that security, or may decline. There is also a risk that it may take longer than expected for the value of these investments to rise to the believed value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Smaller Company Securities Risk – Securities of small- or mid-capitalization companies (smaller companies) can, in certain circumstances, have a higher potential for gains than securities of large-capitalization companies (larger companies) but may also have more risk. For example, smaller companies may be more vulnerable to market downturns and adverse business or economic events than larger, more established companies because they may have more limited financial resources and business operations. These companies are also more likely than larger companies to have more limited product lines and operating histories and to depend on smaller management teams. Their securities may trade less frequently and in smaller volumes and may be less liquid and fluctuate more sharply in value than securities of larger companies. In addition, some smaller companies may not be widely followed by the investment community, which can lower the demand for their stocks.

Currency Risk – Securities denominated in non-U.S. dollar currencies are subject to the risk that, for example, if the value of a foreign currency were to decline against the U.S. dollar, such decline would reduce the U.S. dollar value of any securities held by the Fund denominated in that currency.

Emerging Market Securities Risk – Securities issued by foreign governments or companies in emerging market countries, like Russia and those 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 social, political and economic development. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity 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, which makes them more sensitive to world commodity prices and economic downturns in other countries. Some emerging market countries have a higher risk of currency devaluations, and some of these countries may experience periods of high inflation or rapid changes in inflation rates.

Non-Diversified Mutual Fund Risk – The Fund is non-diversified, which generally means that it may invest a greater percentage of its total assets in the securities of fewer issuers than may a "diversified" fund. This increases the risk that a change in the value of any one investment held by the Fund could affect the overall value of the Fund more than it would affect that of a diversified fund holding a greater number of investments. Accordingly, the Fund's value will likely be more volatile than the value of more diversified funds. The Fund may not operate as a non-diversified fund at all times.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

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. Class R4 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for this class is not yet available. The performance of Class A shares, which have been outstanding as long as any other share class of the Fund, is shown in the bar chart and average annual total return table. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), this class of shares would have annual returns substantially similar to those of Class A shares, which are not offered in this prospectus, because all classes of the Fund's shares invest in the same portfolio of securities.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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 Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    2nd quarter 2009:     36.52%

Worst:   3rd quarter 2011:    -28.02%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-deferred accounts such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of the MSCl China Index (Net) and the Hang Seng Index. The MSCI China Index (Net) is designed to broadly and fairly represent the full diversity of business activities in China. This index aims to capture 85% of the free float adjusted market capitalization in each industry group. The Hang Seng Index tracks the performance of approximately 70% of the total market capitalization of the stock exchange of Hong Kong.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Greater China Fund) | MSCI China Index (Net) (reflects reinvested dividends net of withholding taxes, but reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

22.75%

5 Years

rr_AverageAnnualReturnYear05

(3.51%)

10 Years

rr_AverageAnnualReturnYear10

19.26%

(Columbia Greater China Fund) | Hang Seng Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

23.15%

5 Years

rr_AverageAnnualReturnYear05

(3.90%)

10 Years

rr_AverageAnnualReturnYear10

9.35%

(Columbia Greater China Fund) | Class A Shares

Risk/Return:

rr_RiskReturnAbstract

Annual Return 2003

rr_AnnualReturn2003

54.83%

Annual Return 2004

rr_AnnualReturn2004

14.43%

Annual Return 2005

rr_AnnualReturn2005

9.04%

Annual Return 2006

rr_AnnualReturn2006

69.50%

Annual Return 2007

rr_AnnualReturn2007

59.07%

Annual Return 2008

rr_AnnualReturn2008

(50.08%)

Annual Return 2009

rr_AnnualReturn2009

58.16%

Annual Return 2010

rr_AnnualReturn2010

14.58%

Annual Return 2011

rr_AnnualReturn2011

(23.33%)

Annual Return 2012

rr_AnnualReturn2012

21.15%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

2nd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

36.52%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

3rd quarter 2011:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(28.02%)

1 Year

rr_AverageAnnualReturnYear01

14.17%

5 Years

rr_AverageAnnualReturnYear05

(4.56%)

10 Years

rr_AverageAnnualReturnYear10

15.23%

(Columbia Greater China Fund) | Class A Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.19%

5 Years

rr_AverageAnnualReturnYear05

(4.80%)

10 Years

rr_AverageAnnualReturnYear10

14.99%

(Columbia Greater China Fund) | Class A Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.65%

5 Years

rr_AverageAnnualReturnYear05

(3.77%)

10 Years

rr_AverageAnnualReturnYear10

13.83%

(Columbia Greater China Fund) | Class R4 Shares

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

0.95%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.35%

^[10]

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.30%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

132

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

412

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

713

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,568

(Columbia High Yield Municipal Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks total return, consisting of current income exempt from federal income tax 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.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays 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 period, the Fund's fiscal year end changed from June 30 to May 31. For the fiscal period from July 1, 2011 to May 31, 2012, the Fund's portfolio turnover rate was 9% of the average value of its portfolio and for the prior fiscal year ended June 30, 2011, the Fund's portfolio turnover rate was 23% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

9.00%

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 Class R4 shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in high yield securities. These securities generally include medium grade or below investment grade debt securities or unrated debt securities determined to be of comparable quality, but also may include other securities believed to have the potential for relatively high yield. Below investment grade securities are commonly referred to as "junk bonds." The Fund may invest in bonds of any maturity. The Fund also may invest in industrial development bonds or in participation interests in those bonds.

As a fundamental policy, the Fund will invest its assets so that at least 80% of the Fund's gross income will be exempt from federal income tax (but not necessarily the federal alternative minimum tax). The Fund may invest up to 20% of its total assets in high quality taxable money market instruments.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Inverse Floating Rate Obligations Risk – Inverse floating rate obligations (inverse floaters) represent interests in bonds with interest rates that vary inversely to changes in short-term rates. As short-term rates rise, inverse floaters produce less income, and as short-term rates decline, inverse floaters produce more income. The value of inverse floaters is typically more volatile than the value of bonds with similar maturities. The market value of inverse floaters generally declines when rates rise, and generally will decline further than the market value of a bond with a similar maturity.

Health Care Industry Risk – The Fund's investments in municipal securities may include securities of issuers in the health care industry. The health care industry is subject to the risk of regulatory action or policy changes by a number of governmental agencies and bodies, including federal, state, and local governmental agencies, as well as requirements imposed by private entities, such as insurance companies. A major source of revenue for the health care industry is payments from the Medicare and Medicaid programs. As a result, the industry is sensitive to legislative changes and reductions in governmental spending for such programs. Numerous other factors may affect the industry, such as general and local economic conditions, demand for services, expenses (including malpractice insurance premiums) and competition among health care providers. Additional factors also may adversely affect health care facility operations, such as adoption of legislation proposing a national health insurance program, other state or local health care reform measures, medical and technological advances that alter the need for or cost of health services or the way in which such services are delivered, changes in medical coverage that alter the traditional fee-for-service revenue stream, and efforts by employers, insurers, and governmental agencies to reduce the costs of health insurance and health care services.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. Because the Fund may invest without limit in municipal securities of issuers in any state, the value of Fund shares may be more volatile than the value of shares of funds that limit their investments in municipal securities of issuers in any one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that limit their investments in municipal securities of any one state. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    11.63%

Worst:   4th quarter 2008:   -16.84%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-deferred accounts such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The table compares the Fund's returns for each period with those of Fund's primary benchmark, the Barclays High Yield Municipal Bond Index, which is comprised of bonds with maturities greater than one year, having a par value of at least $3 million issued as part of a transaction size greater than $20 million, and rated no higher than "BB+" or equivalent by any of the three principal rating agencies. The Fund also compares its returns to a Blended Benchmark, which is a custom composite, established by the Investment Manager, consisting of a 60% weighting of the Barclays High Yield Municipal Bond Index and a 40% weighting of the Barclays Municipal Bond Index. The Barclays Municipal Bond Index is considered representative of the broad market for investment-grade, tax-exempt bonds with a maturity of at least one year.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia High Yield Municipal Fund) | 60-40 Bar HY Muni/Bar Muni (reflects no deductions for fees, expenses or other taxes; benchmark performance is as of May 30, 2003)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.47%

5 Years

rr_AverageAnnualReturnYear05

6.14%

10 Years

rr_AverageAnnualReturnYear10

6.12%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2003

(Columbia High Yield Municipal Fund) | Barclays High Yield Muni Bond (reflects no deductions for fees, expenses or other taxes; benchmark performance is as of May 30, 2003)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

18.14%

5 Years

rr_AverageAnnualReturnYear05

6.15%

10 Years

rr_AverageAnnualReturnYear10

6.88%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2003

(Columbia High Yield Municipal Fund) | Class R4 Shares

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

0.54%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.23%

^[10]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.78%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[22]

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

rr_NetExpensesOverAssets

0.70%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

241

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

425

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

959

(Columbia High Yield Municipal Fund) | Class Z Shares

Risk/Return:

rr_RiskReturnAbstract

Annual Return 2003

rr_AnnualReturn2003

6.93%

Annual Return 2004

rr_AnnualReturn2004

5.30%

Annual Return 2005

rr_AnnualReturn2005

5.52%

Annual Return 2006

rr_AnnualReturn2006

6.53%

Annual Return 2007

rr_AnnualReturn2007

(1.79%)

Annual Return 2008

rr_AnnualReturn2008

(22.88%)

Annual Return 2009

rr_AnnualReturn2009

27.77%

Annual Return 2010

rr_AnnualReturn2010

5.42%

Annual Return 2011

rr_AnnualReturn2011

11.25%

Annual Return 2012

rr_AnnualReturn2012

12.60%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.63%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2008:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(16.84%)

1 Year

rr_AverageAnnualReturnYear01

12.60%

5 Years

rr_AverageAnnualReturnYear05

5.41%

10 Years

rr_AverageAnnualReturnYear10

4.93%

(Columbia High Yield Municipal Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

12.60%

5 Years

rr_AverageAnnualReturnYear05

5.41%

10 Years

rr_AverageAnnualReturnYear10

4.93%

(Columbia High Yield Municipal Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.87%

5 Years

rr_AverageAnnualReturnYear05

5.34%

10 Years

rr_AverageAnnualReturnYear10

4.93%

(Columbia Oregon Intermediate Municipal Bond Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks a high level of income exempt from federal and Oregon income tax by investing at least 80% of its net assets (plus any borrowings for investment purposes) in municipal securities issued by the State of Oregon (and its political subdivisions, agencies, authorities and instrumentalities).

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.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays 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 period, the Fund's fiscal year end changed from August 31 to July 31. For the fiscal period from September 1, 2011 to July 31, 2012, the Fund's portfolio turnover rate was 9% of the average value of its portfolio and for the prior fiscal year ended August 31, 2011, the Fund's portfolio turnover rate was 13% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

9.00%

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 Class R4 shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

rr_ExpenseExampleClosingTextBlock

Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets in municipal securities issued by the State of Oregon and its political subdivisions, agencies, authorities and instrumentalities. These securities pay interest exempt from federal income tax (but not necessarily the federal alternative minimum tax) and Oregon individual income tax. The Fund may also invest in securities of other qualified issuers. The Fund may invest up to 20% of its total assets in securities the interest on which is subject to taxation, including the federal alternative minimum tax.

The Fund normally invests in municipal securities that, at the time of purchase, are rated investment grade or are unrated but determined to be of comparable quality. Under normal circumstances, the Fund's dollar-weighted average maturity will be between three and ten years.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

State-Specific Municipal Securities Risk – Securities issued by a particular state and its instrumentalities are subject to the risk of unfavorable developments in such state. The value of Fund shares may be more volatile than the value of shares of funds that invest in municipal securities of issuers in more than one state, as unfavorable developments have the potential to impact more significantly the Fund than funds that invest in municipal securities of many different states. A municipal security can be significantly affected by adverse tax, legislative, demographic or political changes as well as changes in the state's financial or economic condition and prospects. The Statement of Additional Information provides greater detail about risks specific to the municipal securities of the state in which the Fund invests, which investors should carefully consider.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    4.64%

Worst:   4th quarter 2010:   -3.35%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2012

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-deferred accounts such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(Columbia Oregon Intermediate Municipal Bond Fund) | Barclays 3-15 Year Blend Municipal Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.15%

5 Years

rr_AverageAnnualReturnYear05

5.88%

10 Years

rr_AverageAnnualReturnYear10

4.91%

(Columbia Oregon Intermediate Municipal Bond Fund) | Class R4 Shares

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

0.47%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.15%

^[10]

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.62%

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[23]

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

rr_NetExpensesOverAssets

0.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

192

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

340

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

769

(Columbia Oregon Intermediate Municipal Bond Fund) | Class Z Shares

Risk/Return:

rr_RiskReturnAbstract

Annual Return 2003

rr_AnnualReturn2003

5.16%

Annual Return 2004

rr_AnnualReturn2004

4.03%

Annual Return 2005

rr_AnnualReturn2005

2.94%

Annual Return 2006

rr_AnnualReturn2006

3.64%

Annual Return 2007

rr_AnnualReturn2007

3.14%

Annual Return 2008

rr_AnnualReturn2008

0.10%

Annual Return 2009

rr_AnnualReturn2009

9.20%

Annual Return 2010

rr_AnnualReturn2010

2.01%

Annual Return 2011

rr_AnnualReturn2011

9.21%

Annual Return 2012

rr_AnnualReturn2012

4.68%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

3rd quarter 2009:

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

4.64%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

4th quarter 2010:

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.35%)

1 Year

rr_AverageAnnualReturnYear01

4.68%

5 Years

rr_AverageAnnualReturnYear05

4.97%

10 Years

rr_AverageAnnualReturnYear10

4.38%

(Columbia Oregon Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.68%

5 Years

rr_AverageAnnualReturnYear05

4.97%

10 Years

rr_AverageAnnualReturnYear10

4.35%

(Columbia Oregon Intermediate Municipal Bond Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.13%

5 Years

rr_AverageAnnualReturnYear05

4.79%

10 Years

rr_AverageAnnualReturnYear10

4.29%

(Columbia Pacific/Asia Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks long-term 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.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-02-28

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

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94.00%

Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

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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 Class R4 shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

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Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities (including, but not limited to, common stocks, preferred stocks and securities convertible into common or preferred stocks) of companies located in Asia and the Pacific Basin, which includes Australia, New Zealand and India, and other countries within this region (the Pacific/Asia region). The Fund may invest in a variety of countries, industries and sectors and does not attempt to invest a specific percentage of its assets in any given country, industry or sector. The Fund may invest in companies that have market capitalizations of any size.

The Fund may invest in currency forwards and futures for both hedging and non-hedging purposes, including, for example, to seek to enhance returns or, in certain unusual circumstances, when holding a derivative is deemed preferable to holding the underlying asset.

various measures of valuation, including price-to-cash flow, price-to-earnings, price-to-sales, price-to-book value and discounted cash flow. The Investment Manager believes that companies with lower valuations are generally more likely to provide opportunities for capital appreciation.
potential indicators of stock price appreciation, such as anticipated earnings growth, company restructuring, changes in management, business model changes, new product opportunities, or anticipated improvements in macroeconomic factors.

the financial condition and management of a company, including its competitive position, the quality of its balance sheet and earnings, its future prospects, and the potential for growth and stock price appreciation.
overall economic and market conditions.

Risk [Heading]

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Principal Risks

Risk Narrative [Text Block]

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Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Foreign Securities Risk – Foreign securities are subject to special risks as compared to securities of U.S. issuers. For example, foreign markets can be extremely volatile. Fluctuations in currency exchange rates may impact the value of foreign securities denominated in foreign currencies, or in U.S. dollars, without a change in the intrinsic value of those securities. Foreign securities may be less liquid than domestic securities so that the Fund may, at times, be unable to sell foreign securities at desirable times or prices. Brokerage commissions, custodial fees and other fees are also generally higher for foreign securities. The Fund may have limited or no legal recourse in the event of default with respect to certain foreign securities, including those issued by foreign governments. In addition, foreign governments may impose potentially confiscatory withholding or other taxes, which could reduce the amount of income and capital gains available to distribute to shareholders. Other risks include possible delays in the settlement of transactions or in the payment of income; generally less publicly available information about companies; the impact of political, social or diplomatic events; possible seizure, expropriation or nationalization of a company or its assets; possible imposition of currency exchange controls; and accounting, auditing and financial reporting standards that may be less comprehensive and stringent than those applicable to domestic companies.

Currency Risk – Securities denominated in non-U.S. dollar currencies are subject to the risk that, for example, if the value of a foreign currency were to decline against the U.S. dollar, such decline would reduce the U.S. dollar value of any securities held by the Fund denominated in that currency.

Emerging Market Securities Risk – Securities issued by foreign governments or companies in emerging market countries, like Russia and those 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 social, political and economic development. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity 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, which makes them more sensitive to world commodity prices and economic downturns in other countries. Some emerging market countries have a higher risk of currency devaluations, and some of these countries may experience periods of high inflation or rapid changes in inflation rates.

Growth Securities Risk – Because growth securities typically trade at a higher multiple of earnings than other types of securities, the market values of growth securities may be more sensitive to changes in current or expected earnings than the market values of other types of securities. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Value Securities Risk – Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet the Investment Manager's future value assessment of that security, or may decline. There is also a risk that it may take longer than expected for the value of these investments to rise to the believed value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Smaller Company Securities Risk – Securities of small- or mid-capitalization companies (smaller companies) can, in certain circumstances, have a higher potential for gains than securities of large-capitalization companies (larger companies) but may also have more risk. For example, smaller companies may be more vulnerable to market downturns and adverse business or economic events than larger, more established companies because they may have more limited financial resources and business operations. These companies are also more likely than larger companies to have more limited product lines and operating histories and to depend on smaller management teams. Their securities may trade less frequently and in smaller volumes and may be less liquid and fluctuate more sharply in value than securities of larger companies. In addition, some smaller companies may not be widely followed by the investment community, which can lower the demand for their stocks.

Special Situations Risk – Securities of companies that are involved in an initial public offering or a major corporate event, such as a business consolidation or restructuring, may present special risk because of the high degree of uncertainty that can be associated with such events. Securities issued in initial public offerings often are issued by companies that are in the early stages of development, have a history of little or no revenues and may operate at a loss following the offering. It is possible that there will be no active trading market for the securities after the offering, and that the market price of the securities may be subject to significant and unpredictable fluctuations. Investing in special situations may have a magnified effect on the performance of funds with small amounts of assets.

Derivatives Risk – Forward Foreign Currency Contracts – The Fund may enter into forward foreign currency contracts, which are a type of derivative contract, whereby the Fund may agree to buy or sell a country's currency at a specific price on a specific date, usually 30, 60, or 90 days in the future. These currency contracts may change in value due to foreign market fluctuations or foreign currency value fluctuations. The effectiveness of any currency hedging strategy by a Fund may be reduced by the Fund's inability to precisely match forward contract amounts and the value of securities involved. Forward foreign currency contracts used for hedging may also limit any potential gain that might result from an increase or decrease in the value of the currency. When entering into forward foreign currency contracts for investment purposes, unanticipated changes in the currency markets could result in reduced performance for the Fund. At or prior to maturity of a forward contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been movement in forward contract prices. When the Fund converts its foreign currencies into U.S. dollars it may incur currency conversion costs due to the spread between the prices at which it may buy and sell various currencies in the market.

Derivatives Risk — Futures Contracts – The Fund may buy or sell futures. A futures contract is a contract between a buyer (holding the "long" position) and a seller (holding the "short" position) for an asset with delivery deferred until a future date. The buyer agrees to pay a fixed price at the agreed future date and the seller agrees to deliver the asset. The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants decide to make or take delivery, liquidity in the particular futures market could be reduced. Certain futures markets are more liquid than others. In addition, certain futures exchanges often impose a maximum permissible price movement on each futures contract for each trading session. To the extent that the Fund trades on such futures exchanges, the Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement.

Pacific/Asia Regional Risk - The Pacific/Asia region consists of countries in the Pacific Basin, including Australia, China, Hong Kong, India, Indonesia, Japan, Korea, Malaysia, New Zealand, Philippines, Singapore, Taiwan and Thailand, among other countries within this region, and the Fund's investments in the region are thus particularly susceptible to risks in the region. Events in any one country within the region may impact other countries in the region or the Pacific/Asia region as a whole. As a result, events in the region will generally have a greater effect on the Fund and could result in greater volatility and losses than if the Fund were more geographically diversified. Countries within this region can be significantly affected by currency fluctuations and rapid changes in inflation and interest rates. Markets in the Pacific/Asia region can experience significant volatility due to social, regulatory and political uncertainties. In addition, changes in governmental policies in the region could significantly affect local markets in the region. Continued growth of economies and securities markets in the Pacific/Asia region will require sustained economic and fiscal discipline, as well as continued commitment to governmental reforms. Development also may be influenced by international economic conditions, particularly those in the United States, Europe and Japan, and by world demand for goods produced in countries in the Pacific/Asia region.

Bar Chart and Performance Table [Heading]

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Performance Information

Performance Narrative [Text Block]

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The performance shown for the Fund includes the performance of Pacific/Asia Fund, the predecessor to the Fund and a series of Excelsior Funds, Inc., for periods prior to March 31, 2008.

Performance Information Illustrates Variability of Returns [Text]

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The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Performance Availability Phone [Text]

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800.345.6611

Performance Availability Website Address [Text]

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www.columbiamanagement.com

Performance Past Does Not Indicate Future [Text]

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

Bar Chart [Heading]

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

Bar Chart Narrative [Text Block]

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The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Returns During this Period

Best:     2nd quarter 2009:     30.63%

Worst:    3rd quarter 2008:    -20.64%

Performance Table Heading

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Average Annual Total Return as of December 31, 2012

Performance Table Uses Highest Federal Rate

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Performance Table Not Relevant to Tax Deferred

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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 Narrative

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The table compares the Fund's returns for each period with those of the MSCI All Country (AC) Asia Pacific Index (Net) and the MSCI Europe, Australasia and Far East (EAFE) Index (Net). The MSCI AC Asia Pacific Index (Net) is a free float-adjusted, market capitalization-weighted index designed to measure equity market performance in select developed and emerging markets in the Pacific/Asia region.

Performance Table Closing [Text Block]

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(Columbia Pacific/Asia Fund) | MSCI EAFE Index (Net) (reflects reinvested dividends net of withholding taxes but reflects no deductions for fees, expenses or other taxes)

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

17.32%

5 Years

rr_AverageAnnualReturnYear05

(3.69%)

10 Years

rr_AverageAnnualReturnYear10

8.21%

(Columbia Pacific/Asia Fund) | MSCI AC Asia Pacific Index (Net) (reflects reinvested dividends net of withholding taxes but reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.78%

5 Years

rr_AverageAnnualReturnYear05

(1.48%)

10 Years

rr_AverageAnnualReturnYear10

9.73%

(Columbia Pacific/Asia Fund) | Class R4 Shares

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

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0.95%

Distribution and/or service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

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0.38%

^[10]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.34%

^[12]

Fee waivers and/or reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.04%)

^[24]

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

rr_NetExpensesOverAssets

1.30%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

132

Expense Example, with Redemption, 3 Years

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421

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

730

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,609

(Columbia Pacific/Asia Fund) | Class Z Shares

Risk/Return:

rr_RiskReturnAbstract

Annual Return 2003

rr_AnnualReturn2003

42.12%

Annual Return 2004

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13.51%

Annual Return 2005

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24.12%

Annual Return 2006

rr_AnnualReturn2006

10.32%

Annual Return 2007

rr_AnnualReturn2007

11.49%

Annual Return 2008

rr_AnnualReturn2008

(40.30%)

Annual Return 2009

rr_AnnualReturn2009

38.39%

Annual Return 2010

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21.31%

Annual Return 2011

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(13.45%)

Annual Return 2012

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17.32%

Highest Quarterly Return, Label

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2nd quarter 2009:

Highest Quarterly Return

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30.63%

Lowest Quarterly Return, Label

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3rd quarter 2008:

Lowest Quarterly Return

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(20.64%)

1 Year

rr_AverageAnnualReturnYear01

17.32%

5 Years

rr_AverageAnnualReturnYear05

0.35%

10 Years

rr_AverageAnnualReturnYear10

9.62%

(Columbia Pacific/Asia Fund) | Class Z Shares | returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.12%

5 Years

rr_AverageAnnualReturnYear05

(0.25%)

10 Years

rr_AverageAnnualReturnYear10

8.81%

(Columbia Pacific/Asia Fund) | Class Z Shares | returns after taxes on distributions and sale of Fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

11.98%

5 Years

rr_AverageAnnualReturnYear05

0.27%

10 Years

rr_AverageAnnualReturnYear10

8.46%

(Columbia Tax-Exempt Fund)

Risk/Return:

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Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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The Fund seeks total return, consisting of current income exempt from federal income tax and of capital appreciation, consistent with moderate fluctuation of principal.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover [Text Block]

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The Fund pays 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 period, the Fund's fiscal year end changed from November 30 to July 31. For the fiscal period from December 1, 2011 to July 31, 2012, the Fund's portfolio turnover rate was 5% of the average value of its portfolio and for the prior fiscal year ended November 30, 2011, the Fund's portfolio turnover rate was 11% of the average value of its portfolio.

Portfolio Turnover, Rate

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5.00%

Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

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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 Class R4 shares of the Fund 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 table above.

Based on the assumptions listed above, your costs would be:

Expense Example Closing [Text Block]

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Remember this is an example only. Your actual costs may be higher or lower.

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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Under normal circumstances, the Fund invests at least 80% of its total net assets in bonds that pay interest exempt from federal income tax (including the federal alternative minimum tax). These securities are issued by states and their political subdivisions, agencies, authorities and instrumentalities and by other qualified issuers. The Fund may invest up to 20% of its total net assets in securities the interest on which is subject to federal income tax. The Fund may invest in fixed or variable-rate debt securities, including zero-coupon bonds, and the Fund may invest in bonds of any maturity.

Under normal circumstances, the Fund invests at least 65% of its total assets in tax-exempt bonds that, at the time of purchase, are rated investment grade or are unrated but determined to be of comparable quality. The Fund may invest up to 35% of its total assets in bonds (not including pre-refunded bonds) that, at the time of purchase, are rated below investment grade or are unrated but determined to be of comparable quality, which are commonly referred to as "junk bonds." The Fund will invest no more than 25% of its total assets in bonds that, at the time of purchase, are unrated but determined to be of comparable quality to below investment grade bonds.

The Fund may invest in derivatives, including futures, forwards, options, swap contracts, inverse floaters and other derivative instruments. The Fund may invest in derivatives for both hedging and non-hedging purposes, including, for example, to seek to enhance returns or as a substitute for a position in an underlying asset.

Risk [Heading]

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Principal Risks

Risk Narrative [Text Block]

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Investment Strategy Risk – The Fund's manager uses the principal investment strategies and other investment strategies to seek to achieve the Fund's investment objective. There is no assurance that the Fund will achieve its investment objective. Investment decisions may not produce the expected returns, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk – Market risk refers to the possibility that the market values of securities that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. Security values may fall because of factors affecting individual companies, industries or sectors, or the markets as a whole, reducing the value of an investment in the Fund. Accordingly, an investment in the Fund could lose money over short or even long periods, or fail to increase in value. The market values of the securities the Fund holds also can be affected by changes or perceived changes in U.S. or foreign economies and financial markets, and the liquidity of these securities, among other factors. In general, equity securities tend to have greater price volatility than debt securities.

Municipal Securities Risk – Municipal securities are debt obligations generally issued to obtain funds for various public purposes, including general financing for state and local governments, or financing for a specific project or public facility. Municipal securities may be fully or partially backed by the taxing authority of the local government, by the credit of a private issuer, by the current or anticipated revenues from a specific project or specific assets or by domestic or foreign entities providing credit support, such as letters of credit, guarantees or insurance, and are generally classified into general obligation bonds and special revenue obligations. General obligation bonds are backed by an issuer's taxing authority and may be vulnerable to limits on a government's power or ability to raise revenue or increase taxes. They may also depend for payment on legislative appropriation and/or funding or other support from other governmental bodies. Revenue obligations are payable from revenues generated by a particular project or other revenue source, and are typically subject to greater risk of default than general obligation bonds because investors can look only to the revenue generated by the project or other revenue source backing the project, rather than to the general taxing authority of the state or local government issuer of the obligations. Because many municipal securities are issued to finance projects in sectors such as education, health care, transportation and utilities, conditions in those sectors can affect the overall municipal market. Municipal securities generally pay interest that, in the opinion of bond counsel, is free from U.S. federal income tax (and, often, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion or that U.S. federal income tax law will not change. In the event the IRS determines that the issuer does not comply with relevant tax requirements or U.S. federal income tax law changes, interest payments from a security could become federally taxable, possibly retroactively to the date the security was issued, and the value of the security would likely fall. As a shareholder of the Fund, you may be required to file an amended tax return and pay additional taxes as a result.

Interest Rate Risk – Debt securities are subject to interest rate risk. In general, if prevailing interest rates rise, the values of debt securities will tend to fall, and if interest rates fall, the values of debt securities will 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 may affect the value of the Fund's shares. Interest rate risk is generally greater for debt securities with longer maturities/durations.

Credit Risk – Credit risk applies to most debt securities, but is generally less of a factor for obligations backed by the "full faith and credit" of the U.S. Government. The Fund could lose money if the issuer of a debt security owned by the Fund is unable or perceived to be unable to pay interest or repay principal when it becomes due. Various factors could affect the issuer's actual or perceived willingness or ability to make timely interest or principal payments, including changes in the issuer's financial condition or in general economic conditions. Debt securities backed by an issuer's taxing authority may be subject to legal limits on the issuer's power to increase taxes or otherwise to raise revenue, or may be dependent on legislative appropriation or government aid. Certain debt securities are backed only by revenues derived from a particular project or source, rather than by an issuer's taxing authority, and thus may have a greater risk of default.

Changing Distribution Levels Risk – The amount of the distributions paid by the Fund generally depends on the amount of interest 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 and/or dividends the Fund receives from its investments decline.

Derivatives Risk – Derivatives are financial contracts whose values are, for example, based on (or "derived" from) traditional securities (such as a stock or bond), assets (such as a commodity like gold or a foreign currency), reference rates (such as LIBOR) or market indices (such as the Standard & Poor's (S&P) 500® Index). Derivatives involve special risks and may result in losses or may limit the Fund's potential gain from favorable market movements. Derivative strategies often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it would have lost had it invested in the underlying security or other asset. The values of derivatives may move in unexpected ways, especially in unusual market conditions, and may result in increased volatility, among other consequences. The use of derivatives may also increase the amount of taxes payable by shareholders holding shares in a taxable account. Other risks arise from the Fund's potential inability to terminate or to sell derivative positions. A liquid secondary market may not always exist for the Fund's derivative positions at times when the Fund might wish to terminate or to sell such positions. Over-the-counter instruments (investments not traded on an exchange) may be illiquid, and transactions in derivatives traded in the over-the-counter market are subject to the risk that the other party will not meet its obligations. The use of derivatives also involves the risks of mispricing or improper valuation and that changes in the value of the derivative may not correlate perfectly with the underlying security, asset, reference rate or index. The Fund also may not be able to find a suitable derivative transaction counterparty, and thus may be unable to engage in derivative transactions when it is deemed favorable to do so, or at all. U.S. federal legislation has recently been enacted that provides for new clearing, margin, reporting and registration requirements for participants in the derivatives market. While the ultimate impact is not yet clear, these changes could restrict and/or impose significant costs or other burdens upon the Fund's participation in derivatives transactions. For more information on the risks of derivative investments and strategies, see the Statement of Additional Information.

Low and Below Investment Grade Securities Risk – Debt securities with the lowest investment grade rating (e.g., BBB by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. (S&P), or Fitch, Inc. (Fitch) or Baa by Moody's Investors Service, Inc. (Moody's)), or that are below investment grade (which are commonly referred to as "junk bonds") (e.g., BB or below by S&P or Fitch or Ba by Moody's) and unrated securities of comparable quality are more speculative than securities with higher ratings and may experience greater price fluctuations. These securities tend to be more sensitive to credit risk than higher-rated securities, particularly during a downturn in the economy, which is more likely to weaken the ability of the issuers to make principal and interest payments on these securities. These securities typically pay a premium – a higher interest rate or yield – because of the increased risk of loss, including default. These securities also are generally less liquid than higher-rated securities. The securities ratings provided by Moody's, S&P and Fitch are based on analyses by these ratings agencies of the credit quality of the securities and may not take into account every risk related to whether interest or principal will be timely repaid.

Reinvestment Risk – Income from the Fund's debt securities portfolio will decline if and when the Fund invests the proceeds from matured, traded or called securities in securities with market interest rates that are below the current earnings rate of the Fund's portfolio.

Zero-Coupon Bonds Risk – Zero-coupon bonds are bonds that do not pay interest in cash on a current basis, but instead accrue interest over the life of the bond. As a result, these securities are issued at a discount and their values may fluctuate more than the values of similar securities that pay interest periodically. Although these securities pay no interest to holders prior to maturity, interest accrued on these securities is reported as income to the Fund and affects the amounts distributed to its shareholders.

Prepayment and Extension Risk – Prepayment and extension risk is the risk that a loan, bond or other security might be called or otherwise converted, prepaid or redeemed before maturity. This risk is primarily associated with asset-backed securities, including mortgage-backed securities and floating rate loans. If a loan or security is converted, prepaid or redeemed before maturity, particularly during a time of declining interest rates or spreads, the portfolio managers may not be able to invest the proceeds in securities or loans providing as high a level of income, resulting in a reduced yield to the Fund. Conversely, as interest rates rise or spreads widen, the likelihood of prepayment decreases. The portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads because the Fund's investments are locked in at a lower rate for a longer period of time.

Bar Chart and Performance Table [Heading]

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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. Class R4 shares had not commenced operations prior to the date of this prospectus; therefore, performance information for this class is not yet available. The performance of Class A shares, which have been outstanding longer than any other share class of the Fund, is shown in the bar chart and the average annual total return table. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), this class of shares would have annual returns substantially similar to those of Class A shares, which are not offered in this prospectus, because all classes of the Fund's shares invest in the same portfolio of securities.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 Narrative [Text Block]

rr_BarChartNarrativeTextBlock

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 Does Not Reflect Sales Loads [Text]

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If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Returns During this Period

Best:    3rd quarter 2009:    8.66%

Worst:   4th quarter 2010:   -5.98%

Performance Table Heading

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Average Annual Total Return as of December 31, 2012

Performance Table Uses Highest Federal Rate

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Performance Table Not Relevant to Tax Deferred

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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]

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

Performance Table Explanation after Tax Higher

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Performance Table Narrative

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The table compares the Fund's returns for each period with those of the Barclays Municipal Bond Index and the Lipper General & Insured Municipal Debt Funds Classification. The Barclays Municipal Bond Index is considered representative of the broad market for investment-grade, tax-exempt bonds with a maturity of at least one year. The Lipper General & Insured Municipal Debt Funds Classification calculates an average total return (assuming reinvestment of distributions) for mutual funds that either invest primarily in municipal debt issues rated in the top four credit ratings or invest primarily in municipal debt issues insured as to timely payment.

Performance Table Closing [Text Block]

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(Columbia Tax-Exempt Fund) | Lipper General & Insured Municipal Debt Funds Classification (reflects no deduction for taxes)

Risk/Return:

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1 Year

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8.84%

5 Years

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5.29%

10 Years