485BPOS

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	¨
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 78 (File No. 333-131683)	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940

Amendment No. 83 (File No. 811-21852) x

Columbia Funds Series Trust II

50606 Ameriprise Financial Center

Minneapolis, MN 55474

Scott R. Plummer

5228 Ameriprise Financial Center

Minneapolis, MN 55474

(612) 671-1947

Approximate Date of Proposed Public Offering:

It is proposed that this filing will become effective (check appropriate box)

x immediately upon filing pursuant to paragraph (b)

¨ on (date) pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

¨ this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act and the Investment Company Act, the Registrant, COLUMBIA FUNDS SERIES TRUST II, certifies that it meets all of the requirements for effectiveness of this Amendment to its Registration Statement under Rule 485(b) and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Boston, and State of Massachusetts on the 19^th day of December, 2012.

COLUMBIA FUNDS SERIES TRUST II
By	/s/ J. Kevin Connaughton
	J. Kevin Connaughton President

Pursuant to the requirements of the Securities Act, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on the 19^th day of December, 2012.

Signature	Capacity	Signature	Capacity
/s/ J. Kevin Connaughton J. Kevin Connaughton	President (Principal Executive Officer)	/s/ William A. Hawkins* William A. Hawkins	Trustee
/s/ Michael G. Clarke Michael G. Clarke	Chief Financial Officer (Principal Financial Officer)	/s/ R. Glenn Hilliard* R. Glenn Hilliard	Trustee
/s/ Paul D. Pearson Paul D. Pearson	Chief Accounting Officer (Principal Accounting Officer)	/s/ Catherine James Paglia* Catherine James Paglia	Trustee
/s/ Stephen R. Lewis, Jr.* Stephen R. Lewis, Jr.	Chair of the Board	/s/ Leroy C. Richie* Leroy C. Richie	Trustee
/s/ Kathleen A. Blatz* Kathleen A. Blatz	Trustee	/s/ Anthony M. Santomero* Anthony M. Santomero	Trustee
/s/ Edward J. Boudreau, Jr.* Edward J. Boudreau, Jr.	Trustee	/s/ Minor M. Shaw* Minor M. Shaw	Trustee
/s/ Pamela G. Carlton* Pamela G. Carlton	Trustee	/s/ Alison Taunton-Rigby* Alison Taunton-Rigby	Trustee
/s/ William P. Carmichael* William P. Carmichael	Trustee	/s/ William F. Truscott* William F. Truscott	Trustee
/s/ Patricia M. Flynn* Patricia M. Flynn	Trustee

* Signed pursuant to Directors/Trustees Power of Attorney, dated June 8, 2011, filed electronically on or about June 16, 2011 as Exhibit (q) to Registrant’s Post-Effective Amendment No. 28 to Registration Statement No. 333-131683, by:

/s/ Scott R. Plummer

Scott R. Plummer

Exhibit Index

Exhibit 101 Risk/Return Summary in Interactive Data Format.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Columbia Large Value Quantitative Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Large Value Quantitative Fund (the Fund) seeks to provide shareholders with long-term capital growth.
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 on Class A and Class T shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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	November 30, 2013
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 from October 1, 2011 to July 31, 2012, the Fund’s portfolio turnover rate was 73% of the average value of its portfolio and for the prior fiscal year ended September 30, 2011, the Fund’s portfolio turnover rate was 90% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	73.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A and Class T shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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 the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above. Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES OF THE FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	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 equity securities of companies with market capitalizations of over $5 billion at the time of purchase or that are within the market capitalization range of companies in the Russell 1000 Value Index (the Index) at the time of purchase. These equity securities generally include common stocks. The market capitalization range and composition of the Index are subject to change. Over time, the capitalizations of the companies in the Index will change. As they do, the size of the companies in which the Fund invests may change. As long as an investment continues to meet the Fund’s other investment criteria, the Fund may choose to continue to hold a stock even if the company’s market capitalization falls below the market capitalization of the smallest company held within the Index. The Fund can invest in any economic sector and, at times, it may emphasize one or more particular sectors. The Fund will provide shareholders with at least 60 days’ written notice of any change in the 80% policy. In pursuit of the Fund’s objective, Columbia Management Investment Advisers, LLC (the Investment Manager) uses quantitative analysis to evaluate the relative attractiveness of potential investments by considering a variety of factors which may include, among others, valuation, quality and momentum.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include: Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money. Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities. Quantitative Model Risk. Investments selected using quantitative methods may perform differently from the market as a whole. There can be no assurance that these methodologies will enable the Fund to achieve its objective. Sector Risk. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a related group of industries within an economic sector. Companies in the same economic sector may be similarly affected by economic, regulatory, political or market events or conditions, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. The more a fund diversifies its investments, the more it spreads risk and potentially reduces the risks of loss and volatility. 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 portfolio manager’s perceived value assessment of that security, or may decline in price, even though the portfolio manager(s) believe the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to the portfolio manager’s perceived 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.
Risk Lose Money [Text]	rr_RiskLoseMoney	Please remember that with any mutual fund investment you may lose money.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PAST PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges) for the periods shown with those of a broad measure of market performance. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities. The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares. The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Annual Return Caption [Text]	rr_AnnualReturnCaption	(calendar year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown: Highest return for a calendar quarter was 18.96% (quarter ended September 30, 2009). Lowest return for a calendar quarter was –16.74% (quarter ended March 31, 2009). Class A year-to-date return was 14.44% at September 30, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	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).
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	The after-tax returns are shown only for Class A shares and will vary for other share classes.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.
Columbia Large Value Quantitative Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.48%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.23%	[4]
1 year	rr_ExpenseExampleYear01	693
3 years	rr_ExpenseExampleYear03	993
5 years	rr_ExpenseExampleYear05	1,315
10 years	rr_ExpenseExampleYear10	2,227
1 year	rr_ExpenseExampleNoRedemptionYear01	693
3 years	rr_ExpenseExampleNoRedemptionYear03	993
5 years	rr_ExpenseExampleNoRedemptionYear05	1,315
10 years	rr_ExpenseExampleNoRedemptionYear10	2,227
2009	rr_AnnualReturn2009	20.26%
2010	rr_AnnualReturn2010	17.53%
2011	rr_AnnualReturn2011	2.83%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	14.44%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	18.96%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2009
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(16.74%)
1 year	rr_AverageAnnualReturnYear01	(3.07%)
Life of Fund	rr_AverageAnnualReturnSinceInception	(2.76%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	5.00%	[5]
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.23%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.98%	[4]
1 year	rr_ExpenseExampleYear01	701
3 years	rr_ExpenseExampleYear03	974
5 years	rr_ExpenseExampleYear05	1,373
10 years	rr_ExpenseExampleYear10	2,360
1 year	rr_ExpenseExampleNoRedemptionYear01	201
3 years	rr_ExpenseExampleNoRedemptionYear03	674
5 years	rr_ExpenseExampleNoRedemptionYear05	1,173
10 years	rr_ExpenseExampleNoRedemptionYear10	2,360
1 year	rr_AverageAnnualReturnYear01	(2.30%)
Life of Fund	rr_AverageAnnualReturnSinceInception	(2.39%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[6]
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.23%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.98%	[4]
1 year	rr_ExpenseExampleYear01	301
3 years	rr_ExpenseExampleYear03	674
5 years	rr_ExpenseExampleYear05	1,173
10 years	rr_ExpenseExampleYear10	2,550
1 year	rr_ExpenseExampleNoRedemptionYear01	201
3 years	rr_ExpenseExampleNoRedemptionYear03	674
5 years	rr_ExpenseExampleNoRedemptionYear05	1,173
10 years	rr_ExpenseExampleNoRedemptionYear10	2,550
1 year	rr_AverageAnnualReturnYear01	0.99%
Life of Fund	rr_AverageAnnualReturnSinceInception	(1.85%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Class I
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 net current asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.17%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.91%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.13%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.78%	[4]
1 year	rr_ExpenseExampleYear01	80
3 years	rr_ExpenseExampleYear03	277
5 years	rr_ExpenseExampleYear05	492
10 years	rr_ExpenseExampleYear10	1,112
1 year	rr_ExpenseExampleNoRedemptionYear01	80
3 years	rr_ExpenseExampleNoRedemptionYear03	277
5 years	rr_ExpenseExampleNoRedemptionYear05	492
10 years	rr_ExpenseExampleNoRedemptionYear10	1,112
1 year	rr_AverageAnnualReturnYear01	3.15%
Life of Fund	rr_AverageAnnualReturnSinceInception	(0.68%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Class K
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.47%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.21%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.13%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.08%	[4]
1 year	rr_ExpenseExampleYear01	110
3 years	rr_ExpenseExampleYear03	372
5 years	rr_ExpenseExampleYear05	653
10 years	rr_ExpenseExampleYear10	1,459
1 year	rr_ExpenseExampleNoRedemptionYear01	110
3 years	rr_ExpenseExampleNoRedemptionYear03	372
5 years	rr_ExpenseExampleNoRedemptionYear05	653
10 years	rr_ExpenseExampleNoRedemptionYear10	1,459
1 year	rr_AverageAnnualReturnYear01	2.91%
Life of Fund	rr_AverageAnnualReturnSinceInception	(0.95%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.73%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.48%	[4]
1 year	rr_ExpenseExampleYear01	151
3 years	rr_ExpenseExampleYear03	521
5 years	rr_ExpenseExampleYear05	916
10 years	rr_ExpenseExampleYear10	2,025
1 year	rr_ExpenseExampleNoRedemptionYear01	151
3 years	rr_ExpenseExampleNoRedemptionYear03	521
5 years	rr_ExpenseExampleNoRedemptionYear05	916
10 years	rr_ExpenseExampleNoRedemptionYear10	2,025
1 year	rr_AverageAnnualReturnYear01	2.51%
Life of Fund	rr_AverageAnnualReturnSinceInception	(1.36%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Class T
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.79%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.53%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.28%	[4]
1 year	rr_ExpenseExampleYear01	698
3 years	rr_ExpenseExampleYear03	1,008
5 years	rr_ExpenseExampleYear05	1,340
10 years	rr_ExpenseExampleYear10	2,279
1 year	rr_ExpenseExampleNoRedemptionYear01	698
3 years	rr_ExpenseExampleNoRedemptionYear03	1,008
5 years	rr_ExpenseExampleNoRedemptionYear05	1,340
10 years	rr_ExpenseExampleNoRedemptionYear10	2,279
1 year	rr_AverageAnnualReturnYear01	(3.17%)
Life of Fund	rr_AverageAnnualReturnSinceInception	(2.79%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 07, 2011
Columbia Large Value Quantitative Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.48%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.23%	[4]
1 year	rr_ExpenseExampleYear01	125
3 years	rr_ExpenseExampleYear03	444
5 years	rr_ExpenseExampleYear05	785
10 years	rr_ExpenseExampleYear10	1,752
1 year	rr_ExpenseExampleNoRedemptionYear01	125
3 years	rr_ExpenseExampleNoRedemptionYear03	444
5 years	rr_ExpenseExampleNoRedemptionYear05	785
10 years	rr_ExpenseExampleNoRedemptionYear10	1,752
1 year	rr_AverageAnnualReturnYear01	2.60%
Life of Fund	rr_AverageAnnualReturnSinceInception	(1.15%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.69%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.05%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.23%	[3]
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.25%)	[4]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.98%	[4]
1 year	rr_ExpenseExampleYear01	100
3 years	rr_ExpenseExampleYear03	366
5 years	rr_ExpenseExampleYear05	653
10 years	rr_ExpenseExampleYear10	1,472
1 year	rr_ExpenseExampleNoRedemptionYear01	100
3 years	rr_ExpenseExampleNoRedemptionYear03	366
5 years	rr_ExpenseExampleNoRedemptionYear05	653
10 years	rr_ExpenseExampleNoRedemptionYear10	1,472
1 year	rr_AverageAnnualReturnYear01	3.00%
Life of Fund	rr_AverageAnnualReturnSinceInception	(0.98%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Large Value Quantitative Fund | shares returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	(5.87%)
Life of Fund	rr_AverageAnnualReturnSinceInception	(5.20%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | shares returns after taxes on distributions and redemption of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	1.21%
Life of Fund	rr_AverageAnnualReturnSinceInception	(3.09%)
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Large Value Quantitative Fund | Russell 1000 Value Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	0.39%
Life of Fund	rr_AverageAnnualReturnSinceInception	0.60%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

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

[3] The Fund indirectly bears a pro rata portion of the fees and expenses of funds in which it invests. "Total Annual Fund Operating Expenses" in the table may not match "Net Expenses" in the Financial Highlights section of this prospectus because it does not include such acquired fund fees and expenses.

[4] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 1.18% for Class A, 1.93% for Class B, 1.93% for Class C, 0.73% for Class I, 1.03% for Class K, 1.43% for Class R, 1.23% for Class T, 1.18% for Class W and 0.93% for Class Z.

[5] This charge decreases over time.

[6] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Columbia Money Market Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Money Market Fund (the Fund) seeks to provide shareholders with maximum current income consistent with liquidity and 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.
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	November 30, 2013
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that: you invest $10,000 in the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above. Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES OF THE FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund’s assets primarily are invested in money market instruments, such as marketable debt obligations issued by corporations or the U.S. Government or its agencies, bank certificates of deposit, bankers’ acceptances, letters of credit, and commercial paper, including asset-backed commercial paper. The Fund may invest more than 25% of its total assets in money market instruments issued by U.S. banks, U.S. branches of foreign banks and U.S. Government securities. Additionally, the Fund may invest up to 35% of its total assets in U.S. dollar-denominated foreign investments. Because the Fund seeks to maintain a constant net asset value of $1.00 per share, capital appreciation is not expected to play a role in the Fund’s return. The Fund’s yield will vary from day to day. The Fund restricts its investments to instruments that meet certain maturity and quality standards required by the Securities and Exchange Commission (SEC) for money market funds. For example, the Fund: Invests substantially in securities rated in the highest short-term rating category, or deemed to be of comparable quality. However, the Fund is permitted to invest up to 3% of its total assets in securities rated in the second highest short-term rating category, or deemed to be of comparable quality. Limits its U.S. dollar-weighted average portfolio maturity to 60 days or less and its U.S. dollar-weighted average life to 120 days or less. Buys obligations with remaining maturities of 397 days or less. Buys only obligations that are denominated in U.S. dollars and present minimal credit risk.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. The principal risks associated with an investment in the Fund include: Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money. 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. Most asset-backed securities are subject to prepayment risk (i.e., the risk that the Fund will have to reinvest the money received in securities that have lower yields). Rising or high interest rates tend to extend the duration of asset-backed securities, resulting in valuations that are volatile and sensitive to changes in interest rates. Credit Risk. Credit risk applies to most fixed income securities, but is generally less of a factor for obligations backed by the “full faith and credit” of the U.S. Government. It is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities. Industry Concentration Risk. Investments that are concentrated in a particular industry will make the Fund’s portfolio value more susceptible to the events or conditions impacting that particular industry. Because the Fund may invest more than 25% of its total assets in money market instruments issued by banks, the value of the Fund may be adversely affected by economic, political or regulatory developments in or that impact the banking industry. Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. A rise in the overall level of interest rates may result in the decline in the prices of fixed-income securities held by the Fund. The Fund’s yield will vary; it is not fixed for a specific period like the yield on a bank certificate of deposit. Falling interest rates may result in a decline in the Fund’s income and yield (since the Fund must then invest in lower-yielding fixed-income securities). Under certain circumstances, the yield decline could cause the Fund’s net yield to be negative (such as when Fund expenses exceed income levels). Money Market Fund Risk. An investment in the Fund is not a bank deposit, and is not insured or guaranteed by the investment manager, the investment manager’s parent, the FDIC or any other government agency, and it is possible to lose money by investing in the Fund. The Fund seeks to maintain a constant net asset value of $1.00 per share, but the net asset values of money market fund shares can fall, and in infrequent cases in the past have fallen, below $1.00 per share, potentially causing shareholders who redeem their shares at such net asset values to lose money from their original investment. If the net asset value of Fund shares were to fall below $1.00 per share, there is no guarantee that the investment manager or its affiliates would protect the Fund or redeeming shareholders against a loss of principal. Redemption Risk. The Fund may need to sell portfolio securities to meet redemption requests. The Fund could experience a loss when selling portfolio securities to meet redemption requests if there is (i) significant redemption activity by shareholders, including, for example, when a single investor or few large investors make a significant redemption of Fund shares, (ii) a disruption in the normal operation of the markets in which the Fund buys and sells portfolio securities or (iii) the inability of the Fund to sell portfolio securities because such securities are illiquid. In such events, the Fund could be forced to sell portfolio securities at unfavorable prices in an effort to generate sufficient cash to pay redeeming shareholders. The Fund may suspend redemptions or the payment of redemption proceeds when permitted by applicable regulations. Regulatory Risk. Changes in government regulations may adversely affect the value of a security held by the Fund. In addition, the SEC has adopted amendments to money market regulation, imposing new liquidity, credit quality, and maturity requirements on all money market funds. These changes may result in reduced yields for money market funds, including the Fund. The SEC or the Congress may adopt additional reforms to money market regulation, which may impact the operation or performance of the Fund. Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning. U.S. Government Obligations Risk. While U.S. Treasury obligations are backed by the “full faith and credit” of the U.S. Government, such securities are nonetheless subject to credit risk (i.e., the risk that the U.S. Government may be, or be perceived to be, unable or unwilling to honor its financial obligations, such as making payments). Securities issued or guaranteed by federal agencies or authorities and U.S. Government-sponsored instrumentalities or enterprises may or may not be backed by the full faith and credit of the U.S. Government. Securities guaranteed by the Federal Deposit Insurance Corporation under its Temporary Liquidity Guarantee Program (TLGP) are subject to certain risks, including whether such securities will continue to trade in line with recent experience in relation to treasury and government agency securities in terms of yield spread and the volatility of such spread, as well as uncertainty as to how such securities will trade in the secondary market and whether that market will be liquid or illiquid. The TLGP is subject to change.
Risk Money Market Fund [Text]	rr_RiskMoneyMarketFund	Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PAST PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance has varied for each full calendar year shown. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities. The Fund’s past performance is no guarantee of how the Fund will perform in the future. Updated performance information, including current 7-day yield, can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance has varied for each full calendar year shown.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	CLASS A ANNUAL TOTAL RETURNS
Annual Return Caption [Text]	rr_AnnualReturnCaption	(calendar year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown: Highest return for a calendar quarter was 1.20% (quarter ended September 30, 2006). Lowest return for a calendar quarter was 0.00% (quarter ended March 31, 2011). Class A year-to-date return was 0.01% at September 30, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)
Money Market Seven Day Yield Phone	rr_MoneyMarketSevenDayYieldPhone	800.345.6611
Columbia Money Market Fund | Class A
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	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.10%
Other expenses	rr_OtherExpensesOverAssets	0.50%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.92%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.30%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.62%	[2]
1 year	rr_ExpenseExampleYear01	63
3 years	rr_ExpenseExampleYear03	264
5 years	rr_ExpenseExampleYear05	481
10 years	rr_ExpenseExampleYear10	1,108
1 year	rr_ExpenseExampleNoRedemptionYear01	63
3 years	rr_ExpenseExampleNoRedemptionYear03	264
5 years	rr_ExpenseExampleNoRedemptionYear05	481
10 years	rr_ExpenseExampleNoRedemptionYear10	1,108
2002	rr_AnnualReturn2002	1.27%
2003	rr_AnnualReturn2003	0.44%
2004	rr_AnnualReturn2004	0.62%
2005	rr_AnnualReturn2005	2.55%
2006	rr_AnnualReturn2006	4.47%
2007	rr_AnnualReturn2007	4.80%
2008	rr_AnnualReturn2008	2.26%
2009	rr_AnnualReturn2009	0.10%
2010	rr_AnnualReturn2010	0.02%
2011	rr_AnnualReturn2011	0.01%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	0.01%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2006
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.20%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.00%
1 year	rr_AverageAnnualReturnYear01	0.01%
5 years	rr_AverageAnnualReturnYear05	1.42%
10 years	rr_AverageAnnualReturnYear10	1.64%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 06, 1975
Columbia Money Market Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.85%
Other expenses	rr_OtherExpensesOverAssets	0.50%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.67%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.40%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.27%	[2]
1 year	rr_ExpenseExampleYear01	629
3 years	rr_ExpenseExampleYear03	788
5 years	rr_ExpenseExampleYear05	1,071
10 years	rr_ExpenseExampleYear10	1,747
1 year	rr_ExpenseExampleNoRedemptionYear01	129
3 years	rr_ExpenseExampleNoRedemptionYear03	488
5 years	rr_ExpenseExampleNoRedemptionYear05	871
10 years	rr_ExpenseExampleNoRedemptionYear10	1,747
1 year	rr_AverageAnnualReturnYear01	(4.99%)
5 years	rr_AverageAnnualReturnYear05	0.75%
10 years	rr_AverageAnnualReturnYear10	1.20%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 20, 1995
Columbia Money Market Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	0.50%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.57%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.30%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.27%	[2]
1 year	rr_ExpenseExampleYear01	229
3 years	rr_ExpenseExampleYear03	467
5 years	rr_ExpenseExampleYear05	828
10 years	rr_ExpenseExampleYear10	1,847
1 year	rr_ExpenseExampleNoRedemptionYear01	129
3 years	rr_ExpenseExampleNoRedemptionYear03	467
5 years	rr_ExpenseExampleNoRedemptionYear05	828
10 years	rr_ExpenseExampleNoRedemptionYear10	1,847
1 year	rr_AverageAnnualReturnYear01	(0.99%)
5 years	rr_AverageAnnualReturnYear05	1.14%
10 years	rr_AverageAnnualReturnYear10	1.21%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 26, 2000
Columbia Money Market Fund | Class I
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	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.08%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.40%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.08%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.32%	[2]
1 year	rr_ExpenseExampleYear01	33
3 years	rr_ExpenseExampleYear03	121
5 years	rr_ExpenseExampleYear05	217
10 years	rr_ExpenseExampleYear10	500
1 year	rr_ExpenseExampleNoRedemptionYear01	33
3 years	rr_ExpenseExampleNoRedemptionYear03	121
5 years	rr_ExpenseExampleNoRedemptionYear05	217
10 years	rr_ExpenseExampleNoRedemptionYear10	500
1 year	rr_AverageAnnualReturnYear01	0.01%
5 years	rr_AverageAnnualReturnYear05	1.54%
10 years	rr_AverageAnnualReturnYear10	1.81%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 04, 2004
Columbia Money Market Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.50%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.32%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.55%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.77%	[2]
1 year	rr_ExpenseExampleYear01	79
3 years	rr_ExpenseExampleYear03	364
5 years	rr_ExpenseExampleYear05	672
10 years	rr_ExpenseExampleYear10	1,547
1 year	rr_ExpenseExampleNoRedemptionYear01	79
3 years	rr_ExpenseExampleNoRedemptionYear03	364
5 years	rr_ExpenseExampleNoRedemptionYear05	672
10 years	rr_ExpenseExampleNoRedemptionYear10	1,547
1 year	rr_AverageAnnualReturnYear01	0.01%
5 years	rr_AverageAnnualReturnYear05	1.45%
10 years	rr_AverageAnnualReturnYear10	1.65%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 03, 2009
Columbia Money Market Fund | Class R5
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.12%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.44%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.37%	[2]
1 year	rr_ExpenseExampleYear01	38
3 years	rr_ExpenseExampleYear03	134
5 years	rr_ExpenseExampleYear05	240
10 years	rr_ExpenseExampleYear10	550
1 year	rr_ExpenseExampleNoRedemptionYear01	38
3 years	rr_ExpenseExampleNoRedemptionYear03	134
5 years	rr_ExpenseExampleNoRedemptionYear05	240
10 years	rr_ExpenseExampleNoRedemptionYear10	550
1 year	rr_AverageAnnualReturnYear01	0.01%
5 years	rr_AverageAnnualReturnYear05	1.52%
10 years	rr_AverageAnnualReturnYear10	1.69%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 11, 2006
Columbia Money Market Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.10%
Other expenses	rr_OtherExpensesOverAssets	0.50%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.92%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.30%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.62%	[2]
1 year	rr_ExpenseExampleYear01	63
3 years	rr_ExpenseExampleYear03	264
5 years	rr_ExpenseExampleYear05	481
10 years	rr_ExpenseExampleYear10	1,108
1 year	rr_ExpenseExampleNoRedemptionYear01	63
3 years	rr_ExpenseExampleNoRedemptionYear03	264
5 years	rr_ExpenseExampleNoRedemptionYear05	481
10 years	rr_ExpenseExampleNoRedemptionYear10	1,108
1 year	rr_AverageAnnualReturnYear01	0.01%
5 years	rr_AverageAnnualReturnYear05	1.40%
10 years	rr_AverageAnnualReturnYear10	1.63%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 01, 2006
Columbia Money Market Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.32%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.50%	[1]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.82%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.30%)	[2]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.52%	[2]
1 year	rr_ExpenseExampleYear01	53
3 years	rr_ExpenseExampleYear03	232
5 years	rr_ExpenseExampleYear05	426
10 years	rr_ExpenseExampleYear10	990
1 year	rr_ExpenseExampleNoRedemptionYear01	53
3 years	rr_ExpenseExampleNoRedemptionYear03	232
5 years	rr_ExpenseExampleNoRedemptionYear05	426
10 years	rr_ExpenseExampleNoRedemptionYear10	990
1 year	rr_AverageAnnualReturnYear01	0.01%
5 years	rr_AverageAnnualReturnYear05	1.42%
10 years	rr_AverageAnnualReturnYear10	1.64%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 30, 2010

[1] Other expenses have been restated to reflect contractual changes to certain fees paid by the Fund.

[2] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 0.62% for Class A, 1.27% for Class B, 1.27% for Class C, 0.32% for Class I, 0.77% for Class R, 0.37% for Class R5, 0.62% for Class W and 0.52% for Class Z.

[3] This charge decreases over time.

[4] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Columbia Large Core Quantitative Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Large Core Quantitative Fund (the Fund) seeks to provide shareholders with long-term capital growth.
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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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	November 30, 2013
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 year, the Fund’s portfolio turnover rate was 71% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	71.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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 the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above. Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES OF THE FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, at least 80% of the Fund’s net assets (including the amount of any borrowings for investment purposes) are invested in equity securities of companies with market capitalizations greater than $5 billion at the time of purchase or that are within the market capitalization range of companies in the S&P 500 Index (the Index) at the time of purchase. These equity securities generally include common stocks. The market capitalization range and composition of the Index are subject to change. Over time, the capitalizations of the companies in the Index will change. As they do, the size of the companies in which the Fund invests may change. As long as an investment continues to meet the Fund’s other investment criteria, the Fund may choose to continue to hold a stock even if the company’s market capitalization falls below the market capitalization of the smallest company held within the Index. The Fund will provide shareholders with at least 60 days’ written notice of any change in the 80% policy. In pursuit of the Fund’s objective, Columbia Management Investment Advisers, LLC (the Investment Manager) uses quantitative analysis to evaluate the relative attractiveness of potential investments by considering a variety of factors which may include, among others, valuation, quality and momentum. The Fund’s investment strategy may involve frequent trading of portfolio securities. This may cause the Fund to incur higher transaction costs (which may adversely affect the Fund’s performance) and may increase taxable distributions for shareholders.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The Fund is designed for investors with above-average risk tolerance. Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include: Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money. Frequent Trading Risk. The portfolio managers may actively and frequently trade investments in the Fund’s portfolio to carry out its investment strategies. Frequent trading of investments increases the possibility that the Fund, as relevant, will realize taxable capital gains (including short-term capital gains, which are generally taxable to shareholders at higher rates than long-term capital gains for U.S. federal income tax purposes), which could reduce the Fund’s after-tax return. Frequent trading can also mean higher brokerage and other transaction costs, which could reduce the Fund’s return. The trading costs and tax effects associated with portfolio turnover may adversely affect the Fund’s performance. Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may be more sensitive to adverse economic or other circumstances or 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. Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities. Quantitative Model Risk. Investments selected using quantitative methods may perform differently from the market as a whole. There can be no assurance that these methodologies will enable the Fund to achieve its objective.
Risk Lose Money [Text]	rr_RiskLoseMoney	Please remember that with any mutual fund investment you may lose money.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PAST PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges) for the periods shown with those of a broad measure of market performance. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund. Except for differences in expenses and sales charges (where applicable), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities. The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares. The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Annual Return Caption [Text]	rr_AnnualReturnCaption	(calendar year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown: Highest return for a calendar quarter was 15.99% (quarter ended September 30, 2009). Lowest return for a calendar quarter was –22.19% (quarter ended December 31, 2008). Class A year-to-date return was 17.46% at September 30, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	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).
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	The after-tax returns are shown only for Class A shares and will vary for other share classes.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.
Columbia Large Core Quantitative Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.38%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.22%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.20%	[3]
1 year	rr_ExpenseExampleYear01	690
3 years	rr_ExpenseExampleYear03	938
5 years	rr_ExpenseExampleYear05	1,206
10 years	rr_ExpenseExampleYear10	1,970
1 year	rr_ExpenseExampleNoRedemptionYear01	690
3 years	rr_ExpenseExampleNoRedemptionYear03	938
5 years	rr_ExpenseExampleNoRedemptionYear05	1,206
10 years	rr_ExpenseExampleNoRedemptionYear10	1,970
2004	rr_AnnualReturn2004	9.96%
2005	rr_AnnualReturn2005	6.20%
2006	rr_AnnualReturn2006	16.47%
2007	rr_AnnualReturn2007	5.26%
2008	rr_AnnualReturn2008	(38.74%)
2009	rr_AnnualReturn2009	21.42%
2010	rr_AnnualReturn2010	15.14%
2011	rr_AnnualReturn2011	5.51%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	17.46%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	15.99%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(22.19%)
1 year	rr_AverageAnnualReturnYear01	(0.55%)
5 years	rr_AverageAnnualReturnYear05	(2.17%)
Life of Fund	rr_AverageAnnualReturnSinceInception	4.83%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 24, 2003
Columbia Large Core Quantitative Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	5.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.38%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.97%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.95%	[3]
1 year	rr_ExpenseExampleYear01	698
3 years	rr_ExpenseExampleYear03	917
5 years	rr_ExpenseExampleYear05	1,262
10 years	rr_ExpenseExampleYear10	2,104
1 year	rr_ExpenseExampleNoRedemptionYear01	198
3 years	rr_ExpenseExampleNoRedemptionYear03	617
5 years	rr_ExpenseExampleNoRedemptionYear05	1,062
10 years	rr_ExpenseExampleNoRedemptionYear10	2,104
1 year	rr_AverageAnnualReturnYear01	(0.37%)
5 years	rr_AverageAnnualReturnYear05	(2.11%)
Life of Fund	rr_AverageAnnualReturnSinceInception	4.75%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 24, 2003
Columbia Large Core Quantitative Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[5]
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.38%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.97%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.95%	[3]
1 year	rr_ExpenseExampleYear01	298
3 years	rr_ExpenseExampleYear03	617
5 years	rr_ExpenseExampleYear05	1,062
10 years	rr_ExpenseExampleYear10	2,299
1 year	rr_ExpenseExampleNoRedemptionYear01	198
3 years	rr_ExpenseExampleNoRedemptionYear03	617
5 years	rr_ExpenseExampleNoRedemptionYear05	1,062
10 years	rr_ExpenseExampleNoRedemptionYear10	2,299
1 year	rr_AverageAnnualReturnYear01	3.49%
5 years	rr_AverageAnnualReturnYear05	(1.75%)
Life of Fund	rr_AverageAnnualReturnSinceInception	4.75%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 24, 2003
Columbia Large Core Quantitative Fund | Class I
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	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.07%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.66%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.66%	[3]
1 year	rr_ExpenseExampleYear01	67
3 years	rr_ExpenseExampleYear03	211
5 years	rr_ExpenseExampleYear05	368
10 years	rr_ExpenseExampleYear10	826
1 year	rr_ExpenseExampleNoRedemptionYear01	67
3 years	rr_ExpenseExampleNoRedemptionYear03	211
5 years	rr_ExpenseExampleNoRedemptionYear05	368
10 years	rr_ExpenseExampleNoRedemptionYear10	826
1 year	rr_AverageAnnualReturnYear01	5.77%
5 years	rr_AverageAnnualReturnYear05	(0.63%)
Life of Fund	rr_AverageAnnualReturnSinceInception	5.90%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 15, 2004
Columbia Large Core Quantitative Fund | Class K
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.37%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.96%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.96%	[3]
1 year	rr_ExpenseExampleYear01	98
3 years	rr_ExpenseExampleYear03	306
5 years	rr_ExpenseExampleYear05	532
10 years	rr_ExpenseExampleYear10	1,183
1 year	rr_ExpenseExampleNoRedemptionYear01	98
3 years	rr_ExpenseExampleNoRedemptionYear03	306
5 years	rr_ExpenseExampleNoRedemptionYear05	532
10 years	rr_ExpenseExampleNoRedemptionYear10	1,183
1 year	rr_AverageAnnualReturnYear01	5.68%
5 years	rr_AverageAnnualReturnYear05	(0.86%)
Life of Fund	rr_AverageAnnualReturnSinceInception	5.73%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 24, 2003
Columbia Large Core Quantitative Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.38%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.47%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.45%	[3]
1 year	rr_ExpenseExampleYear01	148
3 years	rr_ExpenseExampleYear03	463
5 years	rr_ExpenseExampleYear05	802
10 years	rr_ExpenseExampleYear10	1,761
1 year	rr_ExpenseExampleNoRedemptionYear01	148
3 years	rr_ExpenseExampleNoRedemptionYear03	463
5 years	rr_ExpenseExampleNoRedemptionYear05	802
10 years	rr_ExpenseExampleNoRedemptionYear10	1,761
1 year	rr_AverageAnnualReturnYear01	5.18%
5 years	rr_AverageAnnualReturnYear05	(1.24%)
Life of Fund	rr_AverageAnnualReturnSinceInception	5.30%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 11, 2006
Columbia Large Core Quantitative Fund | Class R5
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.12%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.71%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.71%	[3]
1 year	rr_ExpenseExampleYear01	73
3 years	rr_ExpenseExampleYear03	227
5 years	rr_ExpenseExampleYear05	396
10 years	rr_ExpenseExampleYear10	886
1 year	rr_ExpenseExampleNoRedemptionYear01	73
3 years	rr_ExpenseExampleNoRedemptionYear03	227
5 years	rr_ExpenseExampleNoRedemptionYear05	396
10 years	rr_ExpenseExampleNoRedemptionYear10	886
1 year	rr_AverageAnnualReturnYear01	5.78%
5 years	rr_AverageAnnualReturnYear05	(0.64%)
Life of Fund	rr_AverageAnnualReturnSinceInception	5.78%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 11, 2006
Columbia Large Core Quantitative Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.38%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.22%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.20%	[3]
1 year	rr_ExpenseExampleYear01	122
3 years	rr_ExpenseExampleYear03	385
5 years	rr_ExpenseExampleYear05	669
10 years	rr_ExpenseExampleYear10	1,480
1 year	rr_ExpenseExampleNoRedemptionYear01	122
3 years	rr_ExpenseExampleNoRedemptionYear03	385
5 years	rr_ExpenseExampleNoRedemptionYear05	669
10 years	rr_ExpenseExampleNoRedemptionYear10	1,480
1 year	rr_AverageAnnualReturnYear01	5.53%
5 years	rr_AverageAnnualReturnYear05	(1.05%)
Life of Fund	rr_AverageAnnualReturnSinceInception	5.54%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 01, 2006
Columbia Large Core Quantitative Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.38%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.97%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.95%	[3]
1 year	rr_ExpenseExampleYear01	97
3 years	rr_ExpenseExampleYear03	307
5 years	rr_ExpenseExampleYear05	535
10 years	rr_ExpenseExampleYear10	1,192
1 year	rr_ExpenseExampleNoRedemptionYear01	97
3 years	rr_ExpenseExampleNoRedemptionYear03	307
5 years	rr_ExpenseExampleNoRedemptionYear05	535
10 years	rr_ExpenseExampleNoRedemptionYear10	1,192
1 year	rr_AverageAnnualReturnYear01	5.67%
5 years	rr_AverageAnnualReturnYear05	(0.90%)
Life of Fund	rr_AverageAnnualReturnSinceInception	5.62%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Large Core Quantitative Fund | shares returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	(0.65%)
5 years	rr_AverageAnnualReturnYear05	(2.90%)
Life of Fund	rr_AverageAnnualReturnSinceInception	3.78%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 24, 2003
Columbia Large Core Quantitative Fund | shares returns after taxes on distributions and redemption of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	(0.23%)
5 years	rr_AverageAnnualReturnYear05	(2.14%)
Life of Fund	rr_AverageAnnualReturnSinceInception	3.71%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 24, 2003
Columbia Large Core Quantitative Fund | S&P 500 Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	2.11%
5 years	rr_AverageAnnualReturnYear05	(0.25%)
Life of Fund	rr_AverageAnnualReturnSinceInception	5.88%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect contractual changes to certain fees paid by the Fund.

[3] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 1.20% for Class A, 1.95% for Class B, 1.95% for Class C, 0.75% for Class I, 1.05% for Class K, 1.45% for Class R, 0.80% for Class R5, 1.20% for Class W and 0.95% for Class Z.

[4] This charge decreases over time.

[5] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

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Columbia Money Market Fund

Summary of the Fund

INVESTMENT OBJECTIVE

Columbia Money Market Fund (the Fund) seeks to provide shareholders with maximum current income consistent with liquidity and stability of principal.

FEES AND EXPENSES OF THE FUND

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Columbia Money Market Fund	Class A	Class B		Class C		Class I	Class R	Class R5	Class W	Class Z
Maximum sales charge (load) imposed on purchases, as a % of offering price	none	none		none		none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	none	5.00%	[1]	1.00%	[2]	none	none	none	none	none

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

Annual Fund Operating Expenses Columbia Money Market Fund		Class A	Class B	Class C	Class I	Class R	Class R5	Class W	Class Z
Management fees		0.32%	0.32%	0.32%	0.32%	0.32%	0.32%	0.32%	0.32%
Distribution and/or service (12b-1) fees		0.10%	0.85%	0.75%	none	0.50%	none	0.10%	none
Other expenses	[1]	0.50%	0.50%	0.50%	0.08%	0.50%	0.12%	0.50%	0.50%
Total annual fund operating expenses		0.92%	1.67%	1.57%	0.40%	1.32%	0.44%	0.92%	0.82%
Less: Fee waiver/expense reimbursement	[2]	(0.30%)	(0.40%)	(0.30%)	(0.08%)	(0.55%)	(0.07%)	(0.30%)	(0.30%)
Total annual fund operating expenses after fee waiver/expense reimbursement	[2]	0.62%	1.27%	1.27%	0.32%	0.77%	0.37%	0.62%	0.52%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example Columbia Money Market Fund (USD $)	1 year	3 years	5 years	10 years
Class A	63	264	481	1,108
Class B	629	788	1,071	1,747
Class C	229	467	828	1,847
Class I	33	121	217	500
Class R	79	364	672	1,547
Class R5	38	134	240	550
Class W	63	264	481	1,108
Class Z	53	232	426	990

Expense Example, No Redemption Columbia Money Market Fund (USD $)	1 year	3 years	5 years	10 years
Class A	63	264	481	1,108
Class B	129	488	871	1,747
Class C	129	467	828	1,847
Class I	33	121	217	500
Class R	79	364	672	1,547
Class R5	38	134	240	550
Class W	63	264	481	1,108
Class Z	53	232	426	990

PRINCIPAL INVESTMENT STRATEGIES OF THE FUND

The Fund’s assets primarily are invested in money market instruments, such as marketable debt obligations issued by corporations or the U.S. Government or its agencies, bank certificates of deposit, bankers’ acceptances, letters of credit, and commercial paper, including asset-backed commercial paper. The Fund may invest more than 25% of its total assets in money market instruments issued by U.S. banks, U.S. branches of foreign banks and U.S. Government securities. Additionally, the Fund may invest up to 35% of its total assets in U.S. dollar-denominated foreign investments.

Because the Fund seeks to maintain a constant net asset value of $1.00 per share, capital appreciation is not expected to play a role in the Fund’s return. The Fund’s yield will vary from day to day.

The Fund restricts its investments to instruments that meet certain maturity and quality standards required by the Securities and Exchange Commission (SEC) for money market funds. For example, the Fund:

• Invests substantially in securities rated in the highest short-term rating category, or deemed to be of comparable quality. However, the Fund is permitted to invest up to 3% of its total assets in securities rated in the second highest short-term rating category, or deemed to be of comparable quality.

• Limits its U.S. dollar-weighted average portfolio maturity to 60 days or less and its U.S. dollar-weighted average life to 120 days or less.

• Buys obligations with remaining maturities of 397 days or less.

• Buys only obligations that are denominated in U.S. dollars and present minimal credit risk.

PRINCIPAL RISKS OF INVESTING IN THE FUND

An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.

The principal risks associated with an investment in the Fund include:

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money.

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. Most asset-backed securities are subject to prepayment risk (i.e., the risk that the Fund will have to reinvest the money received in securities that have lower yields). Rising or high interest rates tend to extend the duration of asset-backed securities, resulting in valuations that are volatile and sensitive to changes in interest rates.

Credit Risk. Credit risk applies to most fixed income securities, but is generally less of a factor for obligations backed by the “full faith and credit” of the U.S. Government. It is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities.

Industry Concentration Risk. Investments that are concentrated in a particular industry will make the Fund’s portfolio value more susceptible to the events or conditions impacting that particular industry. Because the Fund may invest more than 25% of its total assets in money market instruments issued by banks, the value of the Fund may be adversely affected by economic, political or regulatory developments in or that impact the banking industry.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. A rise in the overall level of interest rates may result in the decline in the prices of fixed-income securities held by the Fund. The Fund’s yield will vary; it is not fixed for a specific period like the yield on a bank certificate of deposit. Falling interest rates may result in a decline in the Fund’s income and yield (since the Fund must then invest in lower-yielding fixed-income securities). Under certain circumstances, the yield decline could cause the Fund’s net yield to be negative (such as when Fund expenses exceed income levels).

Money Market Fund Risk. An investment in the Fund is not a bank deposit, and is not insured or guaranteed by the investment manager, the investment manager’s parent, the FDIC or any other government agency, and it is possible to lose money by investing in the Fund. The Fund seeks to maintain a constant net asset value of $1.00 per share, but the net asset values of money market fund shares can fall, and in infrequent cases in the past have fallen, below $1.00 per share, potentially causing shareholders who redeem their shares at such net asset values to lose money from their original investment. If the net asset value of Fund shares were to fall below $1.00 per share, there is no guarantee that the investment manager or its affiliates would protect the Fund or redeeming shareholders against a loss of principal.

Redemption Risk. The Fund may need to sell portfolio securities to meet redemption requests. The Fund could experience a loss when selling portfolio securities to meet redemption requests if there is (i) significant redemption activity by shareholders, including, for example, when a single investor or few large investors make a significant redemption of Fund shares, (ii) a disruption in the normal operation of the markets in which the Fund buys and sells portfolio securities or (iii) the inability of the Fund to sell portfolio securities because such securities are illiquid. In such events, the Fund could be forced to sell portfolio securities at unfavorable prices in an effort to generate sufficient cash to pay redeeming shareholders. The Fund may suspend redemptions or the payment of redemption proceeds when permitted by applicable regulations.

Regulatory Risk. Changes in government regulations may adversely affect the value of a security held by the Fund. In addition, the SEC has adopted amendments to money market regulation, imposing new liquidity, credit quality, and maturity requirements on all money market funds. These changes may result in reduced yields for money market funds, including the Fund. The SEC or the Congress may adopt additional reforms to money market regulation, which may impact the operation or performance of the Fund.

Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.

U.S. Government Obligations Risk. While U.S. Treasury obligations are backed by the “full faith and credit” of the U.S. Government, such securities are nonetheless subject to credit risk (i.e., the risk that the U.S. Government may be, or be perceived to be, unable or unwilling to honor its financial obligations, such as making payments). Securities issued or guaranteed by federal agencies or authorities and U.S. Government-sponsored instrumentalities or enterprises may or may not be backed by the full faith and credit of the U.S. Government. Securities guaranteed by the Federal Deposit Insurance Corporation under its Temporary Liquidity Guarantee Program (TLGP) are subject to certain risks, including whether such securities will continue to trade in line with recent experience in relation to treasury and government agency securities in terms of yield spread and the volatility of such spread, as well as uncertainty as to how such securities will trade in the secondary market and whether that market will be liquid or illiquid. The TLGP is subject to change.

PAST PERFORMANCE

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance has varied for each full calendar year shown.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities.

The Fund’s past performance is no guarantee of how the Fund will perform in the future. Updated performance information, including current 7-day yield, can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.

CLASS A ANNUAL TOTAL RETURNS

(calendar year)

During the periods shown:

• Highest return for a calendar quarter was 1.20% (quarter ended September 30, 2006).
• Lowest return for a calendar quarter was 0.00% (quarter ended March 31, 2011).
• Class A year-to-date return was 0.01% at September 30, 2012.

Average Annual Total Returns After Applicable Sales Charges

(for periods ended December 31, 2011)

Average Annual Total Returns Columbia Money Market Fund	Share Class Inception Date	1 year	5 years	10 years
Class A	Oct. 06, 1975	0.01%	1.42%	1.64%
Class B	Mar. 20, 1995	(4.99%)	0.75%	1.20%
Class C	Jun. 26, 2000	(0.99%)	1.14%	1.21%
Class I	Mar. 04, 2004	0.01%	1.54%	1.81%
Class R	Aug. 03, 2009	0.01%	1.45%	1.65%
Class R5	Dec. 11, 2006	0.01%	1.52%	1.69%
Class W	Dec. 01, 2006	0.01%	1.40%	1.63%
Class Z	Apr. 30, 2010	0.01%	1.42%	1.64%

[1] This charge decreases over time.

[2] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect contractual changes to certain fees paid by the Fund.

[2] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 0.62% for Class A, 1.27% for Class B, 1.27% for Class C, 0.32% for Class I, 0.77% for Class R, 0.37% for Class R5, 0.62% for Class W and 0.52% for Class Z.

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Columbia Minnesota Tax-Exempt Fund

Summary of the Fund

INVESTMENT OBJECTIVE

Columbia Minnesota Tax-Exempt Fund (the Fund) seeks to provide shareholders with a high level of income generally exempt from federal income tax as well as from Minnesota state and local tax.

FEES AND EXPENSES OF THE FUND

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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Columbia Minnesota Tax-Exempt Fund	Class A		Class B		Class C		Class Z
Maximum sales charge (load) imposed on purchases, as a % of offering price	4.75%		none		none		none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	1.00%	[1]	5.00%	[2]	1.00%	[3]	none

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

Annual Fund Operating Expenses Columbia Minnesota Tax-Exempt Fund		Class A	Class B	Class C	Class Z
Management fees		0.40%	0.40%	0.40%	0.40%
Distribution and/or service (12b-1) fees		0.25%	1.00%	1.00%	none
Other expenses	[1]	0.20%	0.20%	0.20%	0.20%
Total annual fund operating expenses		0.85%	1.60%	1.60%	0.60%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example Columbia Minnesota Tax-Exempt Fund (USD $)	1 year	3 years	5 years	10 years
Class A	558	734	926	1,482
Class B	663	806	1,074	1,707
Class C	263	506	874	1,909
Class Z	61	193	337	758

Expense Example, No Redemption Columbia Minnesota Tax-Exempt Fund (USD $)	1 year	3 years	5 years	10 years
Class A	558	734	926	1,482
Class B	163	506	874	1,707
Class C	163	506	874	1,909
Class Z	61	193	337	758

Portfolio Turnover

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 period from September 1, 2011 to July 31, 2012, the Fund’s portfolio turnover rate was 8% of the average value of its portfolio and for the prior fiscal year ended August 31, 2011, the Fund’s portfolio turnover rate was 22% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES OF THE FUND

The Fund is a non-diversified mutual fund. Under normal market conditions, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in municipal obligations that are generally exempt from federal income tax as well as from Minnesota state and local income tax. The Fund may invest more than 25% of its total assets in a particular segment of the municipal securities market or in industrial revenue bonds. The Fund also may invest up to 20% of its net assets in debt obligations whose interest is subject to the alternative minimum tax. Additionally, the Fund may invest up to 25% of its net assets in securities rated below investment grade (commonly called “high yield securities” or “junk bonds”).

The Fund may invest in fixed income securities of any maturity and does not seek to maintain a particular dollar-weighted average maturity.

PRINCIPAL RISKS OF INVESTING IN THE FUND

Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include:

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money.

Credit Risk. Credit risk is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities.

Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received by the Fund on the securities it holds. The Fund may not be able to pay distributions or may have to reduce its distribution level if the interest income and/or dividends the Fund receives from its investments decline.

Geographic Concentration Risk/State Risk. Because the Fund invests substantially in municipal securities issued by the state identified in the Fund’s name and political sub-divisions of that state, the Fund will be particularly affected by adverse tax, legislative, regulatory, demographic or political changes as well as changes impacting the state’s financial, economic or other condition and prospects. In addition, because of the relatively small number of issuers of tax-exempt securities in the state, the Fund may invest a higher percentage of assets in a single issuer and, therefore, be more exposed to the risk of loss than a fund that invests more broadly. The value of municipal and other securities owned by the Fund also may be adversely affected by future changes in federal or state income tax laws.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. As interest rates rise or spreads widen, the likelihood of prepayment decreases.

Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. The Fund may have to lower the selling price of its investment, sell other investments, or forego another, more appealing investment opportunity. Judgment plays a larger role in valuing these investments compared to valuing more liquid investments.

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

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities.

Municipal Securities Risk. 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, in some cases, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion.

Non-Diversified Fund Risk. The Fund is non-diversified, which generally means that it will invest a greater percentage of its total assets in the securities of fewer issuers than 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 a more diversified fund.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a loan, bond or other security or investment might be called or otherwise converted, prepaid or redeemed before maturity, and the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. 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.

Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.

PAST PERFORMANCE

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

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

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

CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)

(calendar year)

During the periods shown:

• Highest return for a calendar quarter was 7.67% (quarter ended September 30, 2009).
• Lowest return for a calendar quarter was –5.04% (quarter ended December 31, 2010).
• Class A year-to-date return was 6.82% at September 30, 2012.

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)

Average Annual Total Returns Columbia Minnesota Tax-Exempt Fund	Share Class Inception Date	1 year	5 years	10 years
Class A	Aug. 18, 1986	5.65%	3.86%	4.21%
Class A shares returns after taxes on distributions	Aug. 18, 1986	5.52%	3.83%	4.05%
Class A shares returns after taxes on distributions and redemption of fund shares	Aug. 18, 1986	5.21%	3.86%	4.02%
Class B	Mar. 20, 1995	5.17%	3.77%	3.96%
Class C	Jun. 26, 2000	9.19%	4.08%	3.92%
Class Z	Sep. 27, 2010	11.30%	4.93%	4.76%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		10.70%	5.22%	5.38%
Barclays Minnesota Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		9.47%	5.49%	5.35%
Lipper Minnesota Municipal Debt Funds Index (reflects no deduction for fees or taxes)		10.45%	4.60%	4.80%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] This charge decreases over time.

[3] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect contractual changes to certain fees paid by the Fund.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Columbia AMT-Free Tax-Exempt Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia AMT-Free Tax-Exempt Bond Fund (the Fund) seeks to provide shareholders with as much current income exempt from federal income taxes as possible with only modest risk to the shareholder’s investments.
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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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	November 30, 2013
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 period from December 1, 2011 to July 31, 2012, the Fund’s portfolio turnover rate was 13% of the average value of its portfolio and for the prior fiscal year ended November 30, 2011, the Fund’s portfolio turnover rate was 30% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	13.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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 the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above. Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES OF THE FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund’s assets are invested primarily in high and medium quality municipal bonds and other debt obligations. Under normal market conditions, the Fund will invest at least 80% of its net assets (including the amount of any borrowings for investment purposes) in bonds and other debt obligations issued by or on behalf of state or local governmental units whose interest is exempt from federal income tax. At least 75% of the Fund’s net assets will be in investments: (1) rated in the top four rating categories by Moody’s Investors Service, Inc., Standard & Poor’s Corporation, or Fitch Investors Services, Inc., (2) rated comparable to those four rating categories given by other independent rating agencies, or (3) unrated bonds and other debt obligations that are believed to be of investment grade credit quality. Although the Fund emphasizes high- and medium-quality debt securities, it will assume some credit risk in an effort to achieve higher yield and/or capital appreciation by investing up to 25% of its net assets in below investment grade (junk) bonds. The Fund does not intend to invest in debt obligations the interest from which is subject to the alternative minimum tax (AMT). The Fund may invest in fixed income securities of any maturity and does not seek to maintain a particular dollar-weighted average maturity.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include: Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money. Credit Risk. Credit risk applies to most fixed income securities, but is generally less of a factor for obligations backed by the “full faith and credit” of the U.S. Government. It is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities. Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. As interest rates rise or spreads widen, the likelihood of prepayment decreases. Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. The Fund may have to lower the selling price, sell other investments, or forego another, more appealing investment opportunity. Judgment plays a larger role in valuing these investments as compared to valuing more liquid investments. Low and Below Investment Grade (High-Yield) Securities Risk. Securities with the lowest investment grade rating, securities rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated securities of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade securities. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated securities. High-yield securities are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities. Municipal Securities Risk. 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, in some cases, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion. Prepayment and Extension Risk. Prepayment and extension risk is the risk that a loan, bond or other security or investment might be called or otherwise converted, prepaid or redeemed before maturity, and the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. 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. Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning. 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, regulatory, demographic or political changes as well as changes in the state’s financial, economic or other condition and prospects. The SAI provides greater detail about risks specific to the municipal securities in which the Fund invests, which investors should carefully consider.
Risk Lose Money [Text]	rr_RiskLoseMoney	Please remember that with any mutual fund investment you may lose money.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PAST PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges) for the periods shown with those of a broad measure of market performance as well as one or more secondary benchmarks. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund. Except for differences in expenses and sales charges (where applicable), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities. The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares. The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Annual Return Caption [Text]	rr_AnnualReturnCaption	(calendar year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown: Highest return for a calendar quarter was 8.12% (quarter ended September 30, 2009). Lowest return for a calendar quarter was -5.11% (quarter ended December 31, 2010). Class A year-to-date return was 9.61% at September 30, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	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).
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	The after-tax returns are shown only for Class A shares and will vary for other share classes.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.
Columbia AMT-Free Tax-Exempt Bond Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.75%
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.41%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.86%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.82%	[3]
1 year	rr_ExpenseExampleYear01	555
3 years	rr_ExpenseExampleYear03	733
5 years	rr_ExpenseExampleYear05	926
10 years	rr_ExpenseExampleYear10	1,486
1 year	rr_ExpenseExampleNoRedemptionYear01	555
3 years	rr_ExpenseExampleNoRedemptionYear03	733
5 years	rr_ExpenseExampleNoRedemptionYear05	926
10 years	rr_ExpenseExampleNoRedemptionYear10	1,486
2002	rr_AnnualReturn2002	8.00%
2003	rr_AnnualReturn2003	3.76%
2004	rr_AnnualReturn2004	3.61%
2005	rr_AnnualReturn2005	2.98%
2006	rr_AnnualReturn2006	4.28%
2007	rr_AnnualReturn2007	1.59%
2008	rr_AnnualReturn2008	(6.74%)
2009	rr_AnnualReturn2009	15.11%
2010	rr_AnnualReturn2010	1.95%
2011	rr_AnnualReturn2011	11.18%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	9.61%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	8.12%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(5.11%)
1 year	rr_AverageAnnualReturnYear01	5.95%
5 years	rr_AverageAnnualReturnYear05	3.34%
10 years	rr_AverageAnnualReturnYear10	3.92%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 24, 1976
Columbia AMT-Free Tax-Exempt Bond Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	5.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.41%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.61%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.57%	[3]
1 year	rr_ExpenseExampleYear01	660
3 years	rr_ExpenseExampleYear03	804
5 years	rr_ExpenseExampleYear05	1,073
10 years	rr_ExpenseExampleYear10	1,711
1 year	rr_ExpenseExampleNoRedemptionYear01	160
3 years	rr_ExpenseExampleNoRedemptionYear03	504
5 years	rr_ExpenseExampleNoRedemptionYear05	873
10 years	rr_ExpenseExampleNoRedemptionYear10	1,711
1 year	rr_AverageAnnualReturnYear01	5.36%
5 years	rr_AverageAnnualReturnYear05	3.20%
10 years	rr_AverageAnnualReturnYear10	3.64%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 20, 1995
Columbia AMT-Free Tax-Exempt Bond Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[5]
Management fees	rr_ManagementFeesOverAssets	0.41%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.61%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.57%	[3]
1 year	rr_ExpenseExampleYear01	260
3 years	rr_ExpenseExampleYear03	504
5 years	rr_ExpenseExampleYear05	873
10 years	rr_ExpenseExampleYear10	1,913
1 year	rr_ExpenseExampleNoRedemptionYear01	160
3 years	rr_ExpenseExampleNoRedemptionYear03	504
5 years	rr_ExpenseExampleNoRedemptionYear05	873
10 years	rr_ExpenseExampleNoRedemptionYear10	1,913
1 year	rr_AverageAnnualReturnYear01	9.65%
5 years	rr_AverageAnnualReturnYear05	3.61%
10 years	rr_AverageAnnualReturnYear10	3.67%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 26, 2000
Columbia AMT-Free Tax-Exempt Bond Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.41%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.61%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.57%	[3]
1 year	rr_ExpenseExampleYear01	58
3 years	rr_ExpenseExampleYear03	192
5 years	rr_ExpenseExampleYear05	337
10 years	rr_ExpenseExampleYear10	762
1 year	rr_ExpenseExampleNoRedemptionYear01	58
3 years	rr_ExpenseExampleNoRedemptionYear03	192
5 years	rr_ExpenseExampleNoRedemptionYear05	337
10 years	rr_ExpenseExampleNoRedemptionYear10	762
1 year	rr_AverageAnnualReturnYear01	11.79%
5 years	rr_AverageAnnualReturnYear05	4.40%
10 years	rr_AverageAnnualReturnYear10	4.46%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia AMT-Free Tax-Exempt Bond Fund | shares returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	5.95%
5 years	rr_AverageAnnualReturnYear05	3.34%
10 years	rr_AverageAnnualReturnYear10	3.65%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 24, 1976
Columbia AMT-Free Tax-Exempt Bond Fund | shares returns after taxes on distributions and redemption of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	5.43%
5 years	rr_AverageAnnualReturnYear05	3.44%
10 years	rr_AverageAnnualReturnYear10	3.73%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 24, 1976
Columbia AMT-Free Tax-Exempt Bond Fund | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	10.70%
5 years	rr_AverageAnnualReturnYear05	5.22%
10 years	rr_AverageAnnualReturnYear10	5.38%
Columbia AMT-Free Tax-Exempt Bond Fund | Lipper General Municipal Debt Funds Index (reflects no deduction for taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	10.96%
5 years	rr_AverageAnnualReturnYear05	4.18%
10 years	rr_AverageAnnualReturnYear10	4.77%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect contractual changes to the fees paid by the Fund.

[3] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 0.81% for Class A, 1.56% for Class B, 1.56% for Class C and 0.56% for Class Z.

[4] This charge decreases over time.

[5] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

XML

Columbia AMT-Free Tax-Exempt Bond Fund

Summary of the Fund

INVESTMENT OBJECTIVE

Columbia AMT-Free Tax-Exempt Bond Fund (the Fund) seeks to provide shareholders with as much current income exempt from federal income taxes as possible with only modest risk to the shareholder’s investments.

FEES AND EXPENSES OF THE FUND

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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Columbia AMT-Free Tax-Exempt Bond Fund	Class A		Class B		Class C		Class Z
Maximum sales charge (load) imposed on purchases, as a % of offering price	4.75%		none		none		none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	1.00%	[1]	5.00%	[2]	1.00%	[3]	none

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

Annual Fund Operating Expenses Columbia AMT-Free Tax-Exempt Bond Fund		Class A	Class B	Class C	Class Z
Management fees		0.41%	0.41%	0.41%	0.41%
Distribution and/or service (12b-1) fees		0.25%	1.00%	1.00%	none
Other expenses	[1]	0.20%	0.20%	0.20%	0.20%
Total annual fund operating expenses		0.86%	1.61%	1.61%	0.61%
Less: Fee waiver/expense reimbursement	[2]	(0.04%)	(0.04%)	(0.04%)	(0.04%)
Total annual fund operating expenses after fee waiver/expense reimbursement	[2]	0.82%	1.57%	1.57%	0.57%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example Columbia AMT-Free Tax-Exempt Bond Fund (USD $)	1 year	3 years	5 years	10 years
Class A	555	733	926	1,486
Class B	660	804	1,073	1,711
Class C	260	504	873	1,913
Class Z	58	192	337	762

Expense Example, No Redemption Columbia AMT-Free Tax-Exempt Bond Fund (USD $)	1 year	3 years	5 years	10 years
Class A	555	733	926	1,486
Class B	160	504	873	1,711
Class C	160	504	873	1,913
Class Z	58	192	337	762

Portfolio Turnover

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 period from December 1, 2011 to July 31, 2012, the Fund’s portfolio turnover rate was 13% of the average value of its portfolio and for the prior fiscal year ended November 30, 2011, the Fund’s portfolio turnover rate was 30% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES OF THE FUND

The Fund’s assets are invested primarily in high and medium quality municipal bonds and other debt obligations. Under normal market conditions, the Fund will invest at least 80% of its net assets (including the amount of any borrowings for investment purposes) in bonds and other debt obligations issued by or on behalf of state or local governmental units whose interest is exempt from federal income tax. At least 75% of the Fund’s net assets will be in investments: (1) rated in the top four rating categories by Moody’s Investors Service, Inc., Standard & Poor’s Corporation, or Fitch Investors Services, Inc., (2) rated comparable to those four rating categories given by other independent rating agencies, or (3) unrated bonds and other debt obligations that are believed to be of investment grade credit quality. Although the Fund emphasizes high- and medium-quality debt securities, it will assume some credit risk in an effort to achieve higher yield and/or capital appreciation by investing up to 25% of its net assets in below investment grade (junk) bonds. The Fund does not intend to invest in debt obligations the interest from which is subject to the alternative minimum tax (AMT).

The Fund may invest in fixed income securities of any maturity and does not seek to maintain a particular dollar-weighted average maturity.

PRINCIPAL RISKS OF INVESTING IN THE FUND

Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include:

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money.

Credit Risk. Credit risk applies to most fixed income securities, but is generally less of a factor for obligations backed by the “full faith and credit” of the U.S. Government. It is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. As interest rates rise or spreads widen, the likelihood of prepayment decreases.

Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. The Fund may have to lower the selling price, sell other investments, or forego another, more appealing investment opportunity. Judgment plays a larger role in valuing these investments as compared to valuing more liquid investments.

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

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities.

Municipal Securities Risk. 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, in some cases, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a loan, bond or other security or investment might be called or otherwise converted, prepaid or redeemed before maturity, and the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. 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.

Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.

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, regulatory, demographic or political changes as well as changes in the state’s financial, economic or other condition and prospects. The SAI provides greater detail about risks specific to the municipal securities in which the Fund invests, which investors should carefully consider.

PAST PERFORMANCE

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

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund. Except for differences in expenses and sales charges (where applicable), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities.

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

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

CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)

(calendar year)

During the periods shown:

• Highest return for a calendar quarter was 8.12% (quarter ended September 30, 2009).
• Lowest return for a calendar quarter was -5.11% (quarter ended December 31, 2010).
• Class A year-to-date return was 9.61% at September 30, 2012.

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)

Average Annual Total Returns Columbia AMT-Free Tax-Exempt Bond Fund	Share Class Inception Date	1 year	5 years	10 years
Class A	Nov. 24, 1976	5.95%	3.34%	3.92%
Class A shares returns after taxes on distributions	Nov. 24, 1976	5.95%	3.34%	3.65%
Class A shares returns after taxes on distributions and redemption of fund shares	Nov. 24, 1976	5.43%	3.44%	3.73%
Class B	Mar. 20, 1995	5.36%	3.20%	3.64%
Class C	Jun. 26, 2000	9.65%	3.61%	3.67%
Class Z	Sep. 27, 2010	11.79%	4.40%	4.46%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		10.70%	5.22%	5.38%
Lipper General Municipal Debt Funds Index (reflects no deduction for taxes)		10.96%	4.18%	4.77%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] This charge decreases over time.

[3] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect contractual changes to the fees paid by the Fund.

[2] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 0.81% for Class A, 1.56% for Class B, 1.56% for Class C and 0.56% for Class Z.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Columbia Floating Rate Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Floating Rate Fund (the Fund) seeks to provide shareholders with a high level of current income and,
Objective, Secondary [Text Block]	rr_ObjectiveSecondaryTextBlock	as a secondary objective, preservation of capital.
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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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	November 30, 2013
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 year, the Fund’s portfolio turnover rate was 42% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	42.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	other expenses for Class R4 shares are based on estimated amounts for the Fund’s current fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that: you invest $10,000 in the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above. Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES OF THE FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	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 floating rate loans and other floating rate debt securities. These debt obligations will generally be rated non-investment grade by recognized rating agencies (similar to “junk bonds”) or, if unrated, be considered to be of comparable quality. Up to 25% of the Fund’s net assets may be invested in foreign investments. The Fund will provide shareholders with at least 60 days’ written notice of any change in the 80% policy. Floating rate loans are debt obligations of companies and other similar entities that have interest rates that adjust or “float” periodically (normally on a daily, monthly, quarterly or semiannual basis by reference to a base lending rate (such as LIBOR (London Interbank Offered Rate)) plus a premium). Floating rate loans are typically structured and administered by a financial institution that acts as the agent of the lenders participating in the floating rate loan. The Fund may acquire loans directly through the agent or from another holder of the loan by assignment. They are generally valued on a daily basis by independent pricing services. The Fund normally invests in senior secured floating rate loans. Senior secured floating rate loans ordinarily are secured by specific collateral or assets of the borrower so that holders of the loans will have a claim on those assets senior to the claim of certain other parties in the event of default or bankruptcy by the borrower. These loans usually are senior in rank to other securities issued by the borrower (such as common stock or other debt instruments). The proceeds of the loan primarily are used by the borrower to finance leveraged buy-outs, recapitalizations, dividends to sponsors, mergers and acquisitions, and, to a lesser extent, to finance internal growth or for other corporate purposes. Senior floating rate loans held by the Fund will generally have final maturities of nine years or less. To the extent the Fund invests in derivatives securities, the Fund may count the value of derivative securities with floating rate loan characteristics towards its 80% policy. The Fund may also invest in other securities, including investment grade fixed income debt obligations, non-investment grade fixed income debt obligations and certain money market instruments. For purposes of the 80% policy, money market holdings with a remaining maturity of less than 60 days will be deemed floating rate assets.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The Fund is designed for investors with above-average risk tolerance. Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include: Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money. Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received by the Fund on the securities it holds. The Fund may not be able to pay distributions or may have to reduce its distribution level if the interest income and/or dividends the Fund receives from its investments decline. Confidential Information Access Risk. The Investment Manager normally will seek to avoid the receipt of material, non-public information (Confidential Information) about the issuers of floating rate loans (including from the issuer itself) being considered for acquisition by the Fund, or held in the Fund. The Investment Manager’s decision not to receive Confidential Information may disadvantage the Fund and could adversely affect the Fund’s performance. Counterparty Risk. Counterparty risk is the risk that a counterparty to a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations, and the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed. Credit Risk. Credit risk is the risk that loans or other securities in the Fund’s portfolio may or will decline in price or fail to pay interest or repay principal when due because the borrower of the loan or the issuer of the security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations (such as making payments to the Fund), including as a result of bankruptcy. Bankruptcies may cause a delay to the Fund in acting on the collateral securing a loan, which may adversely affect the Fund. Further, there is risk that a court could take action adverse to the holders of a loan. A default or expected default of a loan could also make it difficult for the Fund to sell the loan at a price approximating the value previously placed on it. Lower quality or unrated loans or securities held by the Fund may present increased credit risk. Foreign Securities Risk. Investments in foreign securities involve certain risks not associated with investments in securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country, including the political, regulatory, economic, social, diplomatic and other conditions or events occurring in the country or region, as well as fluctuations in its currency and the risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than investments in securities of U.S. companies. Highly Leveraged Transactions Risk. The loans and other securities in which the Fund invests may include highly leveraged transactions whereby the borrower assumes large amounts of debt in order to have the financial resources to attempt to achieve its business objectives. Loans or securities that are part of highly leveraged transactions involve a greater risk (including default and bankruptcy) than other investments. Impairment of Collateral Risk. The value of collateral, if any, securing a loan can decline, and may be insufficient to meet the borrower’s obligations or difficult or costly to liquidate. In addition, the Fund’s access to collateral may be limited by bankruptcy or other insolvency laws. Further, certain floating rate and other loans may not be fully collateralized and may decline in value. Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate changes also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Securities with floating interest rates are typically less sensitive to interest rate changes, but may decline in value if their interest rates do not rise as much as interest rates in general. Because rates on certain floating rate loans and other debt securities reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause fluctuations in the Fund’s net asset value. Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of securities which may make it difficult to sell the security at desirable prices. The Fund may have to lower the selling price of its investment, sell other investments, or forego another, more appealing investment opportunity. Floating rate loans generally are subject to legal or contractual restrictions on resale, may trade infrequently, and their value may be impaired when the Fund needs to liquidate such loans. Loans and other securities may trade only in the over-the-counter market rather than on an organized exchange and may be more difficult to purchase or sell at a fair price, which may have a negative impact on the Fund’s performance. Low and Below Investment Grade (High-Yield) Securities Risk. Securities with the lowest investment grade rating, securities rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated securities of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade securities. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated securities. High-yield securities are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities. Prepayment and Extension Risk. Prepayment and extension risk is the risk that a loan, bond or other security or investment might be called or otherwise converted, prepaid or redeemed before maturity, and the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. 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. Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.
Risk Lose Money [Text]	rr_RiskLoseMoney	Please remember that with any mutual fund investment you may lose money.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PAST PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges) for the periods shown with those of a broad measure of market performance. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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. Class R4 shares of the Fund did not commence operations prior to the date of this prospectus and, therefore, performance is not yet available. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund. Except for differences in expenses and sales charges (where applicable), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities. The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares. The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Class R4 shares of the Fund have not commenced operations as of the date of this prospectus.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart shows how the Fund's Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Annual Return Caption [Text]	rr_AnnualReturnCaption	(calendar year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown: Highest return for a calendar quarter was 16.99% (quarter ended June 30, 2009). Lowest return for a calendar quarter was –24.18% (quarter ended December 31, 2008). Class A year-to-date return was 8.34% at September 30, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	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).
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	The after-tax returns are shown only for Class A shares and will vary for other share classes.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.
Columbia Floating Rate Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
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	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.15%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.09%	[3]
1 year	rr_ExpenseExampleYear01	408
3 years	rr_ExpenseExampleYear03	649
5 years	rr_ExpenseExampleYear05	909
10 years	rr_ExpenseExampleYear10	1,655
1 year	rr_ExpenseExampleNoRedemptionYear01	408
3 years	rr_ExpenseExampleNoRedemptionYear03	649
5 years	rr_ExpenseExampleNoRedemptionYear05	909
10 years	rr_ExpenseExampleNoRedemptionYear10	1,655
2007	rr_AnnualReturn2007	1.43%
2008	rr_AnnualReturn2008	(30.44%)
2009	rr_AnnualReturn2009	42.26%
2010	rr_AnnualReturn2010	11.20%
2011	rr_AnnualReturn2011	1.09%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	8.34%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	16.99%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(24.18%)
1 year	rr_AverageAnnualReturnYear01	(1.99%)
5 years	rr_AverageAnnualReturnYear05	1.82%
Life of Fund	rr_AverageAnnualReturnSinceInception	2.61%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 16, 2006
Columbia Floating Rate Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	5.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.90%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.84%	[3]
1 year	rr_ExpenseExampleYear01	687
3 years	rr_ExpenseExampleYear03	991
5 years	rr_ExpenseExampleYear05	1,222
10 years	rr_ExpenseExampleYear10	2,126
1 year	rr_ExpenseExampleNoRedemptionYear01	187
3 years	rr_ExpenseExampleNoRedemptionYear03	591
5 years	rr_ExpenseExampleNoRedemptionYear05	1,022
10 years	rr_ExpenseExampleNoRedemptionYear10	2,026
1 year	rr_AverageAnnualReturnYear01	(4.50%)
5 years	rr_AverageAnnualReturnYear05	1.39%
Life of Fund	rr_AverageAnnualReturnSinceInception	2.26%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 16, 2006
Columbia Floating Rate Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[5]
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.90%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.84%	[3]
1 year	rr_ExpenseExampleYear01	287
3 years	rr_ExpenseExampleYear03	591
5 years	rr_ExpenseExampleYear05	1,022
10 years	rr_ExpenseExampleYear10	2,222
1 year	rr_ExpenseExampleNoRedemptionYear01	187
3 years	rr_ExpenseExampleNoRedemptionYear03	591
5 years	rr_ExpenseExampleNoRedemptionYear05	1,022
10 years	rr_ExpenseExampleNoRedemptionYear10	2,222
1 year	rr_AverageAnnualReturnYear01	(0.53%)
5 years	rr_AverageAnnualReturnYear05	1.70%
Life of Fund	rr_AverageAnnualReturnSinceInception	2.39%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 16, 2006
Columbia Floating Rate Fund | Class I
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	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.14%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.72%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.72%	[3]
1 year	rr_ExpenseExampleYear01	74
3 years	rr_ExpenseExampleYear03	230
5 years	rr_ExpenseExampleYear05	401
10 years	rr_ExpenseExampleYear10	898
1 year	rr_ExpenseExampleNoRedemptionYear01	74
3 years	rr_ExpenseExampleNoRedemptionYear03	230
5 years	rr_ExpenseExampleNoRedemptionYear05	401
10 years	rr_ExpenseExampleNoRedemptionYear10	898
1 year	rr_AverageAnnualReturnYear01	1.44%
5 years	rr_AverageAnnualReturnYear05	2.79%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.48%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 16, 2006
Columbia Floating Rate Fund | Class K
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.44%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.02%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.02%	[3]
1 year	rr_ExpenseExampleYear01	104
3 years	rr_ExpenseExampleYear03	325
5 years	rr_ExpenseExampleYear05	564
10 years	rr_ExpenseExampleYear10	1,252
1 year	rr_ExpenseExampleNoRedemptionYear01	104
3 years	rr_ExpenseExampleNoRedemptionYear03	325
5 years	rr_ExpenseExampleNoRedemptionYear05	564
10 years	rr_ExpenseExampleNoRedemptionYear10	1,252
1 year	rr_AverageAnnualReturnYear01	1.18%
5 years	rr_AverageAnnualReturnYear05	2.64%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.32%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 16, 2006
Columbia Floating Rate Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.40%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.34%	[3]
1 year	rr_ExpenseExampleYear01	136
3 years	rr_ExpenseExampleYear03	438
5 years	rr_ExpenseExampleYear05	761
10 years	rr_ExpenseExampleYear10	1,680
1 year	rr_ExpenseExampleNoRedemptionYear01	136
3 years	rr_ExpenseExampleNoRedemptionYear03	438
5 years	rr_ExpenseExampleNoRedemptionYear05	761
10 years	rr_ExpenseExampleNoRedemptionYear10	1,680
1 year	rr_AverageAnnualReturnYear01	0.86%
5 years	rr_AverageAnnualReturnYear05	2.21%
Life of Fund	rr_AverageAnnualReturnSinceInception	2.91%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Floating Rate Fund | Class R4
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.90%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.84%	[3]
1 year	rr_ExpenseExampleYear01	86
3 years	rr_ExpenseExampleYear03	281
5 years	rr_ExpenseExampleYear05	493
10 years	rr_ExpenseExampleYear10	1,107
1 year	rr_ExpenseExampleNoRedemptionYear01	86
3 years	rr_ExpenseExampleNoRedemptionYear03	281
5 years	rr_ExpenseExampleNoRedemptionYear05	493
10 years	rr_ExpenseExampleNoRedemptionYear10	1,107
1 year	rr_AverageAnnualReturnYear01	1.09%	[6]
5 years	rr_AverageAnnualReturnYear05	2.44%	[6]
Life of Fund	rr_AverageAnnualReturnSinceInception	3.14%	[6]
Columbia Floating Rate Fund | Class R5
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.19%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.77%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.77%	[3]
1 year	rr_ExpenseExampleYear01	79
3 years	rr_ExpenseExampleYear03	246
5 years	rr_ExpenseExampleYear05	429
10 years	rr_ExpenseExampleYear10	958
1 year	rr_ExpenseExampleNoRedemptionYear01	79
3 years	rr_ExpenseExampleNoRedemptionYear03	246
5 years	rr_ExpenseExampleNoRedemptionYear05	429
10 years	rr_ExpenseExampleNoRedemptionYear10	958
1 year	rr_AverageAnnualReturnYear01	1.44%
5 years	rr_AverageAnnualReturnYear05	2.65%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.32%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 01, 2008
Columbia Floating Rate Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.15%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.09%	[3]
1 year	rr_ExpenseExampleYear01	111
3 years	rr_ExpenseExampleYear03	360
5 years	rr_ExpenseExampleYear05	628
10 years	rr_ExpenseExampleYear10	1,397
1 year	rr_ExpenseExampleNoRedemptionYear01	111
3 years	rr_ExpenseExampleNoRedemptionYear03	360
5 years	rr_ExpenseExampleNoRedemptionYear05	628
10 years	rr_ExpenseExampleNoRedemptionYear10	1,397
1 year	rr_AverageAnnualReturnYear01	1.20%
5 years	rr_AverageAnnualReturnYear05	2.37%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.08%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 01, 2006
Columbia Floating Rate Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.58%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.90%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.84%	[3]
1 year	rr_ExpenseExampleYear01	86
3 years	rr_ExpenseExampleYear03	281
5 years	rr_ExpenseExampleYear05	493
10 years	rr_ExpenseExampleYear10	1,107
1 year	rr_ExpenseExampleNoRedemptionYear01	86
3 years	rr_ExpenseExampleNoRedemptionYear03	281
5 years	rr_ExpenseExampleNoRedemptionYear05	493
10 years	rr_ExpenseExampleNoRedemptionYear10	1,107
1 year	rr_AverageAnnualReturnYear01	1.36%
5 years	rr_AverageAnnualReturnYear05	2.51%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.20%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Floating Rate Fund | shares returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	(3.49%)
5 years	rr_AverageAnnualReturnYear05	(0.10%)
Life of Fund	rr_AverageAnnualReturnSinceInception	0.62%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 16, 2006
Columbia Floating Rate Fund | shares returns after taxes on distributions and redemption of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	(1.26%)
5 years	rr_AverageAnnualReturnYear05	0.40%
Life of Fund	rr_AverageAnnualReturnSinceInception	1.04%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 16, 2006
Columbia Floating Rate Fund | Credit Suisse Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	1.82%
5 years	rr_AverageAnnualReturnYear05	3.32%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.85%	[7]

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] Other expenses for Class A, Class B, Class C, Class K, Class R, Class R5, Class W and Class Z shares have been restated to reflect contractual changes to certain fees paid by the Fund and other expenses for Class R4 shares are based on estimated amounts for the Fund's current fiscal year.

[3] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 1.09% for Class A, 1.84% for Class B, 1.84% for Class C, 0.74% for Class I, 1.04% for Class K, 1.34% for Class R, 0.84% for Class R4, 0.79% for Class R5, 1.09% for Class W and 0.84% for Class Z.

[4] This charge decreases over time.

[5] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[6] Class R4 shares of the Fund have not commenced operations as of the date of this prospectus.

[7] Credit Suisse Leveraged Loan Index Life return is as of 2/28/06.

XML

Document and Entity Information	12 Months Ended
	Dec. 01, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Jul. 31, 2012
Registrant Name	Columbia Funds Series Trust II
Central Index Key	0001352280
Amendment Flag	false
Document Creation Date	Nov. 27, 2012
Document Effective Date	Dec. 01, 2012
Prospectus Date	Dec. 01, 2012

XML

Columbia Large Core Quantitative Fund

Summary of the Fund

INVESTMENT OBJECTIVE

Columbia Large Core Quantitative Fund (the Fund) seeks to provide shareholders with long-term capital growth.

FEES AND EXPENSES OF THE FUND

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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Columbia Large Core Quantitative Fund	Class A		Class B		Class C		Class I	Class K	Class R	Class R5	Class W	Class Z
Maximum sales charge (load) imposed on purchases, as a % of offering price	5.75%		none		none		none	none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	1.00%	[1]	5.00%	[2]	1.00%	[3]	none	none	none	none	none	none

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

Annual Fund Operating Expenses Columbia Large Core Quantitative Fund		Class A	Class B	Class C	Class I	Class K	Class R	Class R5	Class W	Class Z
Management fees		0.59%	0.59%	0.59%	0.59%	0.59%	0.59%	0.59%	0.59%	0.59%
Distribution and/or service (12b-1) fees		0.25%	1.00%	1.00%	none	none	0.50%	none	0.25%	none
Other expenses	[1]	0.38%	0.38%	0.38%	0.07%	0.37%	0.38%	0.12%	0.38%	0.38%
Total annual fund operating expenses		1.22%	1.97%	1.97%	0.66%	0.96%	1.47%	0.71%	1.22%	0.97%
Less: Fee waiver/expense reimbursement	[2]	(0.02%)	(0.02%)	(0.02%)	none	none	(0.02%)	none	(0.02%)	(0.02%)
Total annual fund operating expenses after fee waiver/expense reimbursement	[2]	1.20%	1.95%	1.95%	0.66%	0.96%	1.45%	0.71%	1.20%	0.95%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example Columbia Large Core Quantitative Fund (USD $)	1 year	3 years	5 years	10 years
Class A	690	938	1,206	1,970
Class B	698	917	1,262	2,104
Class C	298	617	1,062	2,299
Class I	67	211	368	826
Class K	98	306	532	1,183
Class R	148	463	802	1,761
Class R5	73	227	396	886
Class W	122	385	669	1,480
Class Z	97	307	535	1,192

Expense Example, No Redemption Columbia Large Core Quantitative Fund (USD $)	1 year	3 years	5 years	10 years
Class A	690	938	1,206	1,970
Class B	198	617	1,062	2,104
Class C	198	617	1,062	2,299
Class I	67	211	368	826
Class K	98	306	532	1,183
Class R	148	463	802	1,761
Class R5	73	227	396	886
Class W	122	385	669	1,480
Class Z	97	307	535	1,192

Portfolio Turnover

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 year, the Fund’s portfolio turnover rate was 71% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES OF THE FUND

Under normal market conditions, at least 80% of the Fund’s net assets (including the amount of any borrowings for investment purposes) are invested in equity securities of companies with market capitalizations greater than $5 billion at the time of purchase or that are within the market capitalization range of companies in the S&P 500 Index (the Index) at the time of purchase. These equity securities generally include common stocks. The market capitalization range and composition of the Index are subject to change. Over time, the capitalizations of the companies in the Index will change. As they do, the size of the companies in which the Fund invests may change. As long as an investment continues to meet the Fund’s other investment criteria, the Fund may choose to continue to hold a stock even if the company’s market capitalization falls below the market capitalization of the smallest company held within the Index. The Fund will provide shareholders with at least 60 days’ written notice of any change in the 80% policy.

In pursuit of the Fund’s objective, Columbia Management Investment Advisers, LLC (the Investment Manager) uses quantitative analysis to evaluate the relative attractiveness of potential investments by considering a variety of factors which may include, among others, valuation, quality and momentum.

The Fund’s investment strategy may involve frequent trading of portfolio securities. This may cause the Fund to incur higher transaction costs (which may adversely affect the Fund’s performance) and may increase taxable distributions for shareholders.

PRINCIPAL RISKS OF INVESTING IN THE FUND

The Fund is designed for investors with above-average risk tolerance. Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include:

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money.

Frequent Trading Risk. The portfolio managers may actively and frequently trade investments in the Fund’s portfolio to carry out its investment strategies. Frequent trading of investments increases the possibility that the Fund, as relevant, will realize taxable capital gains (including short-term capital gains, which are generally taxable to shareholders at higher rates than long-term capital gains for U.S. federal income tax purposes), which could reduce the Fund’s after-tax return. Frequent trading can also mean higher brokerage and other transaction costs, which could reduce the Fund’s return. The trading costs and tax effects associated with portfolio turnover may adversely affect the Fund’s performance.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may be more sensitive to adverse economic or other circumstances or 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.

Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities.

Quantitative Model Risk. Investments selected using quantitative methods may perform differently from the market as a whole. There can be no assurance that these methodologies will enable the Fund to achieve its objective.

PAST PERFORMANCE

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

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund. Except for differences in expenses and sales charges (where applicable), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities.

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

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

CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)

During the periods shown:

• Highest return for a calendar quarter was 15.99% (quarter ended September 30, 2009).
• Lowest return for a calendar quarter was –22.19% (quarter ended December 31, 2008).
• Class A year-to-date return was 17.46% at September 30, 2012.

(calendar year)

Average Annual Total Returns After Applicable Sales Charges

(for periods ended December 31, 2011)

Average Annual Total Returns Columbia Large Core Quantitative Fund	Share Class Inception Date	1 year	5 years	Life of Fund
Class A	Apr. 24, 2003	(0.55%)	(2.17%)	4.83%
Class A shares returns after taxes on distributions	Apr. 24, 2003	(0.65%)	(2.90%)	3.78%
Class A shares returns after taxes on distributions and redemption of fund shares	Apr. 24, 2003	(0.23%)	(2.14%)	3.71%
Class B	Apr. 24, 2003	(0.37%)	(2.11%)	4.75%
Class C	Apr. 24, 2003	3.49%	(1.75%)	4.75%
Class I	Jul. 15, 2004	5.77%	(0.63%)	5.90%
Class K	Apr. 24, 2003	5.68%	(0.86%)	5.73%
Class R	Dec. 11, 2006	5.18%	(1.24%)	5.30%
Class R5	Dec. 11, 2006	5.78%	(0.64%)	5.78%
Class W	Dec. 01, 2006	5.53%	(1.05%)	5.54%
Class Z	Sep. 27, 2010	5.67%	(0.90%)	5.62%
S&P 500 Index (reflects no deduction for fees, expenses or taxes)		2.11%	(0.25%)	5.88%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] This charge decreases over time.

[3] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect contractual changes to certain fees paid by the Fund.

[2] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 1.20% for Class A, 1.95% for Class B, 1.95% for Class C, 0.75% for Class I, 1.05% for Class K, 1.45% for Class R, 0.80% for Class R5, 1.20% for Class W and 0.95% for Class Z.

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Columbia Limited Duration Credit Fund

Summary of the Fund

INVESTMENT OBJECTIVE

Columbia Limited Duration Credit Fund (the Fund) seeks to provide shareholders with a level of current income consistent with preservation of capital.

FEES AND EXPENSES OF THE FUND

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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Columbia Limited Duration Credit Fund	Class A		Class B		Class C		Class I	Class K	Class R4	Class R5	Class W	Class Z
Maximum sales charge (load) imposed on purchases, as a % of offering price	3.00%		none		none		none	none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	1.00%	[1]	5.00%	[2]	1.00%	[3]	none	none	none	none	none	none

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

Annual Fund Operating Expenses Columbia Limited Duration Credit Fund		Class A	Class B	Class C	Class I	Class K	Class R4	Class R5	Class W	Class Z
Management fees		0.36%	0.36%	0.36%	0.36%	0.36%	0.36%	0.36%	0.36%	0.36%
Distribution and/or service (12b-1) fees		0.25%	1.00%	1.00%	none	none	none	none	0.25%	none
Other expenses	[1]	0.28%	0.28%	0.28%	0.11%	0.41%	0.28%	0.16%	0.28%	0.28%
Total annual fund operating expenses		0.89%	1.64%	1.64%	0.47%	0.77%	0.64%	0.52%	0.89%	0.64%
Less: Fee waiver/expense reimbursement	[2]	(0.04%)	(0.04%)	(0.04%)	none	none	(0.04%)	none	(0.04%)	(0.04%)
Total annual fund operating expenses after fee waiver/expense reimbursement	[2]	0.85%	1.60%	1.60%	0.47%	0.77%	0.60%	0.52%	0.85%	0.60%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example Columbia Limited Duration Credit Fund (USD $)	1 year	3 years	5 years	10 years
Class A	384	572	775	1,364
Class B	663	814	1,089	1,744
Class C	263	514	889	1,945
Class I	48	151	264	594
Class K	79	246	429	958
Class R4	61	201	353	798
Class R5	53	167	291	656
Class W	87	280	490	1,097
Class Z	61	201	353	798

Expense Example, No Redemption Columbia Limited Duration Credit Fund (USD $)	1 year	3 years	5 years	10 years
Class A	384	572	775	1,364
Class B	163	514	889	1,744
Class C	163	514	889	1,945
Class I	48	151	264	594
Class K	79	246	429	958
Class R4	61	201	353	798
Class R5	53	167	291	656
Class W	87	280	490	1,097
Class Z	61	201	353	798

Portfolio Turnover

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 year, the Fund’s portfolio turnover rate was 106% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES OF THE FUND

Under normal circumstances, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in corporate bonds. The Fund will primarily invest in debt securities with short- and intermediate-term maturities generally similar to those included in the Fund’s benchmark index. The Fund may invest up to 15% of its net assets in securities rated below investment grade (i.e., junk bonds). Up to 25% of the Fund’s net assets may be invested in foreign investments, including emerging markets.

PRINCIPAL RISKS OF INVESTING IN THE FUND

Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include:

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index or other funds with similar investment objectives. The Fund may fail to achieve its investment objective(s) and may lose money.

Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received by the Fund on the securities it holds. The Fund may not be able to pay distributions or may have to reduce its distribution level if the interest income and/or dividends the Fund receives from its investments decline.

Credit Risk. Credit risk is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Lower quality or unrated securities held by the Fund present greater credit risk as compared to higher-rated securities.

Emerging Market Securities Risk. Securities issued by foreign governments or companies in emerging market countries are more likely to have greater exposure to the risks of investing in foreign securities that are described in Foreign Securities Risk. In addition, emerging market countries are more likely to experience instability resulting, for example, from rapid changes or developments in social, political and economic conditions. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity (i.e., lower trading volumes and less liquidity) than more developed countries. Emerging market securities tend to be more volatile than securities in more developed markets. Many emerging market countries are heavily dependent on international trade and have fewer trading partners, which makes them more sensitive to world commodity prices and economic downturns in other countries, and some have a higher risk of currency devaluations.

Foreign Securities Risk. Investments in foreign securities involve certain risks not associated with investments in U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country or region, including the political, regulatory, economic, social, diplomatic and other conditions or events occurring in the country, as well as fluctuations in its currency and the risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than investments in U.S. companies.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. As interest rates rise or spreads widen, the likelihood of prepayment decreases.

Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. The Fund may have to lower the selling price, sell other investments, or forego another, more appealing investment opportunity. Judgment plays a larger role in valuing these investments as compared to valuing more liquid investments.

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

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities.

Sector Risk. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a related group of industries within an economic sector. Companies in the same economic sector may be similarly affected by economic, regulatory, political or market events or conditions, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. The more a fund diversifies its investments, the more it spreads risk and potentially reduces the risks of loss and volatility.

PAST PERFORMANCE

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

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class that commenced operations before the periods ended shown in the table below 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. Class R5 shares of the Fund commenced operations after the periods ended shown in the table below and, therefore, performance is not yet available. Class R4 shares of the Fund did not commence operations prior to the date of this prospectus and, therefore, performance is not yet available. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund.

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

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

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

CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)

(calendar year)

During the periods shown:

• Highest return for a calendar quarter was 5.06% (quarter ended September 30, 2009).
• Lowest return for a calendar quarter was -3.46% (quarter ended December 31, 2008).
• Class A year-to-date return was 5.11% at September 30, 2012.

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)

Average Annual Total Returns Columbia Limited Duration Credit Fund		Share Class Inception Date	1 year	5 years	Life of Fund
Class A		Jun. 19, 2003	(0.68%)	3.72%	3.16%
Class A shares returns after taxes on distributions		Jun. 19, 2003	(1.61%)	2.37%	1.90%
Class A shares returns after taxes on distributions and redemption of fund shares		Jun. 19, 2003	(0.44%)	2.37%	1.94%
Class B		Jun. 19, 2003	(3.34%)	3.21%	2.75%
Class C		Jun. 19, 2003	0.66%	3.57%	2.75%
Class I		Mar. 04, 2004	2.78%	4.73%	3.86%
Class K		Jun. 19, 2003	2.48%	4.57%	3.72%
Class R4	[1]		2.42%	4.35%	3.53%
Class R5		Nov. 08, 2012	2.42%	4.35%	3.53%
Class W		Dec. 01, 2006	2.44%	4.31%	3.51%
Class Z		Sep. 27, 2010	2.71%	4.40%	3.56%
Barclays U.S. 1-5 Year Corporate Index (reflects no deduction for fees, expenses or taxes)	[2]		3.14%	5.39%	4.28%	[3]
Barclays U.S. 1-5 Year Credit Index (reflects no deduction for fees, expenses or taxes)	[2]		3.04%	5.29%	4.13%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] This charge decreases over time.

[3] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[1] Other expenses for Class A, Class B, Class C, Class K, Class W and Class Z shares have been restated to reflect contractual changes to certain fees paid by the Fund and other expenses for Class R4 and Class R5 shares are based on estimated amounts for the Fund's current fiscal year.

[2] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 0.85% for Class A, 1.60% for Class B, 1.60% for Class C, 0.49% for Class I, 0.79% for Class K, 0.60% for Class R4, 0.54% for Class R5, 0.85% for Class W and 0.60% for Class Z.

[1] Class R4 shares of the Fund have not commenced operations as of the date of this prospectus.

[2] On December 1, 2011, the Barclays U.S. 1-5 Year Corporate Index (the New Index) replaced the Barclays U.S. 1-5 Year Credit Index (the Former Index) as the Fund's primary benchmark. The Fund's Investment Manager made this recommendation to the Fund's Board of Trustees because the Investment Manager believes that the New Index provides a more appropriate basis for comparing the Fund's performance. Information on both the New Index and the Former Index will be included for a one-year transition period. Thereafter, only the New Index will be included.

[3] Since Inception 6/30/03.

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Columbia Large Value Quantitative Fund

Summary of the Fund

INVESTMENT OBJECTIVE

Columbia Large Value Quantitative Fund (the Fund) seeks to provide shareholders with long-term capital growth.

FEES AND EXPENSES OF THE FUND

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 on Class A and Class T shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Columbia Large Value Quantitative Fund	Class A		Class T		Class B		Class C		Class I	Class K	Class R	Class W	Class Z
Maximum sales charge (load) imposed on purchases, as a % of offering price	5.75%		5.75%		none		none		none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net current asset value	1.00%	[1]	1.00%	[1]	5.00%	[2]	1.00%	[3]	none	none	none	none	none

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

Annual Fund Operating Expenses Columbia Large Value Quantitative Fund		Class A	Class B	Class C	Class I	Class K	Class R	Class T	Class W	Class Z
Management fees		0.69%	0.69%	0.69%	0.69%	0.69%	0.69%	0.69%	0.69%	0.69%
Distribution and/or service (12b-1) fees		0.25%	1.00%	1.00%	none	none	0.50%	none	0.25%	none
Other expenses	[1]	0.49%	0.49%	0.49%	0.17%	0.47%	0.49%	0.79%	0.49%	0.49%
Acquired fund fees and expenses		0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
Total annual fund operating expenses	[2]	1.48%	2.23%	2.23%	0.91%	1.21%	1.73%	1.53%	1.48%	1.23%
Less: Fee waiver/expense reimbursement	[3]	(0.25%)	(0.25%)	(0.25%)	(0.13%)	(0.13%)	(0.25%)	(0.25%)	(0.25%)	(0.25%)
Total annual fund operating expenses after fee waiver/expense reimbursement	[3]	1.23%	1.98%	1.98%	0.78%	1.08%	1.48%	1.28%	1.23%	0.98%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example Columbia Large Value Quantitative Fund (USD $)	1 year	3 years	5 years	10 years
Class A	693	993	1,315	2,227
Class B	701	974	1,373	2,360
Class C	301	674	1,173	2,550
Class I	80	277	492	1,112
Class K	110	372	653	1,459
Class R	151	521	916	2,025
Class T	698	1,008	1,340	2,279
Class W	125	444	785	1,752
Class Z	100	366	653	1,472

Expense Example, No Redemption Columbia Large Value Quantitative Fund (USD $)	1 year	3 years	5 years	10 years
Class A	693	993	1,315	2,227
Class B	201	674	1,173	2,360
Class C	201	674	1,173	2,550
Class I	80	277	492	1,112
Class K	110	372	653	1,459
Class R	151	521	916	2,025
Class T	698	1,008	1,340	2,279
Class W	125	444	785	1,752
Class Z	100	366	653	1,472

Portfolio Turnover

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 from October 1, 2011 to July 31, 2012, the Fund’s portfolio turnover rate was 73% of the average value of its portfolio and for the prior fiscal year ended September 30, 2011, the Fund’s portfolio turnover rate was 90% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES OF THE FUND

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 equity securities of companies with market capitalizations of over $5 billion at the time of purchase or that are within the market capitalization range of companies in the Russell 1000 Value Index (the Index) at the time of purchase. These equity securities generally include common stocks. The market capitalization range and composition of the Index are subject to change. Over time, the capitalizations of the companies in the Index will change. As they do, the size of the companies in which the Fund invests may change. As long as an investment continues to meet the Fund’s other investment criteria, the Fund may choose to continue to hold a stock even if the company’s market capitalization falls below the market capitalization of the smallest company held within the Index. The Fund can invest in any economic sector and, at times, it may emphasize one or more particular sectors. The Fund will provide shareholders with at least 60 days’ written notice of any change in the 80% policy.

In pursuit of the Fund’s objective, Columbia Management Investment Advisers, LLC (the Investment Manager) uses quantitative analysis to evaluate the relative attractiveness of potential investments by considering a variety of factors which may include, among others, valuation, quality and momentum.

PRINCIPAL RISKS OF INVESTING IN THE FUND

Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include:

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money.

Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities.

Quantitative Model Risk. Investments selected using quantitative methods may perform differently from the market as a whole. There can be no assurance that these methodologies will enable the Fund to achieve its objective.

Sector Risk. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a related group of industries within an economic sector. Companies in the same economic sector may be similarly affected by economic, regulatory, political or market events or conditions, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. The more a fund diversifies its investments, the more it spreads risk and potentially reduces the risks of loss and volatility.

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 portfolio manager’s perceived value assessment of that security, or may decline in price, even though the portfolio manager(s) believe the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to the portfolio manager’s perceived 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.

PAST PERFORMANCE

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

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities.

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

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

CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)

(calendar year)

During the periods shown:

• Highest return for a calendar quarter was 18.96% (quarter ended September 30, 2009).
• Lowest return for a calendar quarter was –16.74% (quarter ended March 31, 2009).
• Class A year-to-date return was 14.44% at September 30, 2012.

Average Annual Total Returns After Applicable Sales Charges

(for periods ended December 31, 2011)

Average Annual Total Returns Columbia Large Value Quantitative Fund	Share Class Inception Date	1 year	Life of Fund
Class A	Aug. 01, 2008	(3.07%)	(2.76%)
Class A shares returns after taxes on distributions	Aug. 01, 2008	(5.87%)	(5.20%)
Class A shares returns after taxes on distributions and redemption of fund shares	Aug. 01, 2008	1.21%	(3.09%)
Class B	Aug. 01, 2008	(2.30%)	(2.39%)
Class C	Aug. 01, 2008	0.99%	(1.85%)
Class I	Aug. 01, 2008	3.15%	(0.68%)
Class K	Aug. 01, 2008	2.91%	(0.95%)
Class R	Aug. 01, 2008	2.51%	(1.36%)
Class T	Mar. 07, 2011	(3.17%)	(2.79%)
Class W	Aug. 01, 2008	2.60%	(1.15%)
Class Z	Sep. 27, 2010	3.00%	(0.98%)
Russell 1000 Value Index (reflects no deduction for fees, expenses or taxes)		0.39%	0.60%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] This charge decreases over time.

[3] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[1] Other expenses for Class A, Class B, Class C, Class K, Class R, Class T, Class W and Class Z shares have been restated to reflect contractual changes to the fees paid by the Fund.

[2] The Fund indirectly bears a pro rata portion of the fees and expenses of funds in which it invests. "Total Annual Fund Operating Expenses" in the table may not match "Net Expenses" in the Financial Highlights section of this prospectus because it does not include such acquired fund fees and expenses.

[3] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 1.18% for Class A, 1.93% for Class B, 1.93% for Class C, 0.73% for Class I, 1.03% for Class K, 1.43% for Class R, 1.23% for Class T, 1.18% for Class W and 0.93% for Class Z.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Columbia Minnesota Tax-Exempt Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Minnesota Tax-Exempt Fund (the Fund) seeks to provide shareholders with a high level of income generally exempt from federal income tax as well as from Minnesota state and local tax.
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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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 period from September 1, 2011 to July 31, 2012, the Fund’s portfolio turnover rate was 8% of the average value of its portfolio and for the prior fiscal year ended August 31, 2011, the Fund’s portfolio turnover rate was 22% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	8.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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 the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES OF THE FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund is a non-diversified mutual fund. Under normal market conditions, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in municipal obligations that are generally exempt from federal income tax as well as from Minnesota state and local income tax. The Fund may invest more than 25% of its total assets in a particular segment of the municipal securities market or in industrial revenue bonds. The Fund also may invest up to 20% of its net assets in debt obligations whose interest is subject to the alternative minimum tax. Additionally, the Fund may invest up to 25% of its net assets in securities rated below investment grade (commonly called “high yield securities” or “junk bonds”). The Fund may invest in fixed income securities of any maturity and does not seek to maintain a particular dollar-weighted average maturity.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include: Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money. Credit Risk. Credit risk is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Unrated securities held by the Fund may present increased credit risk as compared to higher-rated securities. Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received by the Fund on the securities it holds. The Fund may not be able to pay distributions or may have to reduce its distribution level if the interest income and/or dividends the Fund receives from its investments decline. Geographic Concentration Risk/State Risk. Because the Fund invests substantially in municipal securities issued by the state identified in the Fund’s name and political sub-divisions of that state, the Fund will be particularly affected by adverse tax, legislative, regulatory, demographic or political changes as well as changes impacting the state’s financial, economic or other condition and prospects. In addition, because of the relatively small number of issuers of tax-exempt securities in the state, the Fund may invest a higher percentage of assets in a single issuer and, therefore, be more exposed to the risk of loss than a fund that invests more broadly. The value of municipal and other securities owned by the Fund also may be adversely affected by future changes in federal or state income tax laws. Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. As interest rates rise or spreads widen, the likelihood of prepayment decreases. Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. The Fund may have to lower the selling price of its investment, sell other investments, or forego another, more appealing investment opportunity. Judgment plays a larger role in valuing these investments compared to valuing more liquid investments. Low and Below Investment Grade (High-Yield) Securities Risk. Securities with the lowest investment grade rating, securities rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated securities of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade securities. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated securities. High-yield securities are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities. Municipal Securities Risk. 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, in some cases, the federal alternative minimum tax). There is no assurance that the Internal Revenue Service (IRS) will agree with this opinion. Non-Diversified Fund Risk. The Fund is non-diversified, which generally means that it will invest a greater percentage of its total assets in the securities of fewer issuers than 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 a more diversified fund. Prepayment and Extension Risk. Prepayment and extension risk is the risk that a loan, bond or other security or investment might be called or otherwise converted, prepaid or redeemed before maturity, and the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. 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. Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.
Risk Lose Money [Text]	rr_RiskLoseMoney	Please remember that with any mutual fund investment you may lose money.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-Diversified Fund Risk. The Fund is non-diversified, which generally means that it will invest a greater percentage of its total assets in the securities of fewer issuers than 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 a more diversified fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PAST PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges) for the periods shown with those of a broad measure of market performance as well as one or more secondary benchmarks. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities. The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Annual Return Caption [Text]	rr_AnnualReturnCaption	(calendar year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown: Highest return for a calendar quarter was 7.67% (quarter ended September 30, 2009). Lowest return for a calendar quarter was –5.04% (quarter ended December 31, 2010). Class A year-to-date return was 6.82% at September 30, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	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).
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.
Columbia Minnesota Tax-Exempt Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.75%
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.85%
1 year	rr_ExpenseExampleYear01	558
3 years	rr_ExpenseExampleYear03	734
5 years	rr_ExpenseExampleYear05	926
10 years	rr_ExpenseExampleYear10	1,482
1 year	rr_ExpenseExampleNoRedemptionYear01	558
3 years	rr_ExpenseExampleNoRedemptionYear03	734
5 years	rr_ExpenseExampleNoRedemptionYear05	926
10 years	rr_ExpenseExampleNoRedemptionYear10	1,482
2002	rr_AnnualReturn2002	7.79%
2003	rr_AnnualReturn2003	5.02%
2004	rr_AnnualReturn2004	3.60%
2005	rr_AnnualReturn2005	2.30%
2006	rr_AnnualReturn2006	4.28%
2007	rr_AnnualReturn2007	1.76%
2008	rr_AnnualReturn2008	(4.51%)
2009	rr_AnnualReturn2009	15.72%
2010	rr_AnnualReturn2010	1.59%
2011	rr_AnnualReturn2011	11.01%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	6.82%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	7.67%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(5.04%)
1 year	rr_AverageAnnualReturnYear01	5.65%
5 years	rr_AverageAnnualReturnYear05	3.86%
10 years	rr_AverageAnnualReturnYear10	4.21%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 18, 1986
Columbia Minnesota Tax-Exempt Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.60%
1 year	rr_ExpenseExampleYear01	663
3 years	rr_ExpenseExampleYear03	806
5 years	rr_ExpenseExampleYear05	1,074
10 years	rr_ExpenseExampleYear10	1,707
1 year	rr_ExpenseExampleNoRedemptionYear01	163
3 years	rr_ExpenseExampleNoRedemptionYear03	506
5 years	rr_ExpenseExampleNoRedemptionYear05	874
10 years	rr_ExpenseExampleNoRedemptionYear10	1,707
1 year	rr_AverageAnnualReturnYear01	5.17%
5 years	rr_AverageAnnualReturnYear05	3.77%
10 years	rr_AverageAnnualReturnYear10	3.96%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 20, 1995
Columbia Minnesota Tax-Exempt Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.60%
1 year	rr_ExpenseExampleYear01	263
3 years	rr_ExpenseExampleYear03	506
5 years	rr_ExpenseExampleYear05	874
10 years	rr_ExpenseExampleYear10	1,909
1 year	rr_ExpenseExampleNoRedemptionYear01	163
3 years	rr_ExpenseExampleNoRedemptionYear03	506
5 years	rr_ExpenseExampleNoRedemptionYear05	874
10 years	rr_ExpenseExampleNoRedemptionYear10	1,909
1 year	rr_AverageAnnualReturnYear01	9.19%
5 years	rr_AverageAnnualReturnYear05	4.08%
10 years	rr_AverageAnnualReturnYear10	3.92%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 26, 2000
Columbia Minnesota Tax-Exempt Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.40%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.60%
1 year	rr_ExpenseExampleYear01	61
3 years	rr_ExpenseExampleYear03	193
5 years	rr_ExpenseExampleYear05	337
10 years	rr_ExpenseExampleYear10	758
1 year	rr_ExpenseExampleNoRedemptionYear01	61
3 years	rr_ExpenseExampleNoRedemptionYear03	193
5 years	rr_ExpenseExampleNoRedemptionYear05	337
10 years	rr_ExpenseExampleNoRedemptionYear10	758
1 year	rr_AverageAnnualReturnYear01	11.30%
5 years	rr_AverageAnnualReturnYear05	4.93%
10 years	rr_AverageAnnualReturnYear10	4.76%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Minnesota Tax-Exempt Fund | shares returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	5.52%
5 years	rr_AverageAnnualReturnYear05	3.83%
10 years	rr_AverageAnnualReturnYear10	4.05%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 18, 1986
Columbia Minnesota Tax-Exempt Fund | shares returns after taxes on distributions and redemption of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	5.21%
5 years	rr_AverageAnnualReturnYear05	3.86%
10 years	rr_AverageAnnualReturnYear10	4.02%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 18, 1986
Columbia Minnesota Tax-Exempt Fund | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	10.70%
5 years	rr_AverageAnnualReturnYear05	5.22%
10 years	rr_AverageAnnualReturnYear10	5.38%
Columbia Minnesota Tax-Exempt Fund | Barclays Minnesota Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	9.47%
5 years	rr_AverageAnnualReturnYear05	5.49%
10 years	rr_AverageAnnualReturnYear10	5.35%
Columbia Minnesota Tax-Exempt Fund | Lipper Minnesota Municipal Debt Funds Index (reflects no deduction for fees or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	10.45%
5 years	rr_AverageAnnualReturnYear05	4.60%
10 years	rr_AverageAnnualReturnYear10	4.80%

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect contractual changes to certain fees paid by the Fund.

[3] This charge decreases over time.

[4] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Columbia Limited Duration Credit Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Summary of the Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Limited Duration Credit Fund (the Fund) seeks to provide shareholders with a level of current income consistent with preservation of capital.
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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
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	November 30, 2013
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 year, the Fund’s portfolio turnover rate was 106% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	106.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	other expenses for Class R4 and Class R5 shares are based on estimated amounts for the Fund’s current fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that: you invest $10,000 in the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above. Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES OF THE FUND
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in corporate bonds. The Fund will primarily invest in debt securities with short- and intermediate-term maturities generally similar to those included in the Fund’s benchmark index. The Fund may invest up to 15% of its net assets in securities rated below investment grade (i.e., junk bonds). Up to 25% of the Fund’s net assets may be invested in foreign investments, including emerging markets.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include: Active Management Risk. Due to its active management, the Fund could underperform its benchmark index or other funds with similar investment objectives. The Fund may fail to achieve its investment objective(s) and may lose money. Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received by the Fund on the securities it holds. The Fund may not be able to pay distributions or may have to reduce its distribution level if the interest income and/or dividends the Fund receives from its investments decline. Credit Risk. Credit risk is the risk that the issuer of a fixed-income security may or will default or otherwise become unable or unwilling, or perceived to be unable or unwilling, to honor a financial obligation, such as making payments to the Fund when due. If the Fund purchases unrated securities, or if the rating of a security is lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual. Lower quality or unrated securities held by the Fund present greater credit risk as compared to higher-rated securities. Emerging Market Securities Risk. Securities issued by foreign governments or companies in emerging market countries are more likely to have greater exposure to the risks of investing in foreign securities that are described in Foreign Securities Risk. In addition, emerging market countries are more likely to experience instability resulting, for example, from rapid changes or developments in social, political and economic conditions. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity (i.e., lower trading volumes and less liquidity) than more developed countries. Emerging market securities tend to be more volatile than securities in more developed markets. Many emerging market countries are heavily dependent on international trade and have fewer trading partners, which makes them more sensitive to world commodity prices and economic downturns in other countries, and some have a higher risk of currency devaluations. Foreign Securities Risk. Investments in foreign securities involve certain risks not associated with investments in U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country or region, including the political, regulatory, economic, social, diplomatic and other conditions or events occurring in the country, as well as fluctuations in its currency and the risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than investments in U.S. companies. Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. As interest rates rise or spreads widen, the likelihood of prepayment decreases. Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of investments which may make it difficult to sell the investment at a desirable time or price. The Fund may have to lower the selling price, sell other investments, or forego another, more appealing investment opportunity. Judgment plays a larger role in valuing these investments as compared to valuing more liquid investments. Low and Below Investment Grade (High-Yield) Securities Risk. Securities with the lowest investment grade rating and securities rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated securities of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade securities. In addition, these investments have greater price fluctuations and are more likely to experience a default than higher-rated securities. High-yield securities are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities. Sector Risk. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a related group of industries within an economic sector. Companies in the same economic sector may be similarly affected by economic, regulatory, political or market events or conditions, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. The more a fund diversifies its investments, the more it spreads risk and potentially reduces the risks of loss and volatility.
Risk Lose Money [Text]	rr_RiskLoseMoney	Please remember that with any mutual fund investment you may lose money.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PAST PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges) for the periods shown with those of a broad measure of market performance as well as the Fund’s former benchmark. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class that commenced operations before the periods ended shown in the table below 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. Class R5 shares of the Fund commenced operations after the periods ended shown in the table below and, therefore, performance is not yet available. Class R4 shares of the Fund did not commence operations prior to the date of this prospectus and, therefore, performance is not yet available. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund. Except for differences in expenses and sales charges (where applicable), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities. The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-deferred accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares. The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiamanagement.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Class R5 shares of the Fund commenced operations after the periods ended shown in the table below and, therefore, performance is not yet available. Class R4 shares of the Fund did not commence operations prior to the date of this prospectus and, therefore, performance is not yet available.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiamanagement.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Annual Return Caption [Text]	rr_AnnualReturnCaption	(calendar year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown: Highest return for a calendar quarter was 5.06% (quarter ended September 30, 2009). Lowest return for a calendar quarter was -3.46% (quarter ended December 31, 2008). Class A year-to-date return was 5.11% at September 30, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2011)
Performance Table Market Index Changed	rr_PerformanceTableMarketIndexChanged	On December 1, 2011, the Barclays U.S. 1-5 Year Corporate Index (the New Index) replaced the Barclays U.S. 1-5 Year Credit Index (the Former Index) as the Fund’s primary benchmark. The Fund’s Investment Manager made this recommendation to the Fund’s Board of Trustees because the Investment Manager believes that the New Index provides a more appropriate basis for comparing the Fund’s performance. Information on both the New Index and the Former Index will be included for a one-year transition period. Thereafter, only the New Index will be included.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns shown in the table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	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).
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	The after-tax returns are shown only for Class A shares and will vary for other share classes.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.
Columbia Limited Duration Credit Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
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	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.89%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.85%	[3]
1 year	rr_ExpenseExampleYear01	384
3 years	rr_ExpenseExampleYear03	572
5 years	rr_ExpenseExampleYear05	775
10 years	rr_ExpenseExampleYear10	1,364
1 year	rr_ExpenseExampleNoRedemptionYear01	384
3 years	rr_ExpenseExampleNoRedemptionYear03	572
5 years	rr_ExpenseExampleNoRedemptionYear05	775
10 years	rr_ExpenseExampleNoRedemptionYear10	1,364
2004	rr_AnnualReturn2004	3.25%
2005	rr_AnnualReturn2005	1.52%
2006	rr_AnnualReturn2006	4.09%
2007	rr_AnnualReturn2007	4.88%
2008	rr_AnnualReturn2008	(6.04%)
2009	rr_AnnualReturn2009	15.47%
2010	rr_AnnualReturn2010	6.17%
2011	rr_AnnualReturn2011	2.42%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	5.11%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.06%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.46%)
1 year	rr_AverageAnnualReturnYear01	(0.68%)
5 years	rr_AverageAnnualReturnYear05	3.72%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.16%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 19, 2003
Columbia Limited Duration Credit Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	5.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.64%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.60%	[3]
1 year	rr_ExpenseExampleYear01	663
3 years	rr_ExpenseExampleYear03	814
5 years	rr_ExpenseExampleYear05	1,089
10 years	rr_ExpenseExampleYear10	1,744
1 year	rr_ExpenseExampleNoRedemptionYear01	163
3 years	rr_ExpenseExampleNoRedemptionYear03	514
5 years	rr_ExpenseExampleNoRedemptionYear05	889
10 years	rr_ExpenseExampleNoRedemptionYear10	1,744
1 year	rr_AverageAnnualReturnYear01	(3.34%)
5 years	rr_AverageAnnualReturnYear05	3.21%
Life of Fund	rr_AverageAnnualReturnSinceInception	2.75%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 19, 2003
Columbia Limited Duration Credit Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	1.00%	[5]
Management fees	rr_ManagementFeesOverAssets	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.64%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.60%	[3]
1 year	rr_ExpenseExampleYear01	263
3 years	rr_ExpenseExampleYear03	514
5 years	rr_ExpenseExampleYear05	889
10 years	rr_ExpenseExampleYear10	1,945
1 year	rr_ExpenseExampleNoRedemptionYear01	163
3 years	rr_ExpenseExampleNoRedemptionYear03	514
5 years	rr_ExpenseExampleNoRedemptionYear05	889
10 years	rr_ExpenseExampleNoRedemptionYear10	1,945
1 year	rr_AverageAnnualReturnYear01	0.66%
5 years	rr_AverageAnnualReturnYear05	3.57%
Life of Fund	rr_AverageAnnualReturnSinceInception	2.75%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 19, 2003
Columbia Limited Duration Credit Fund | Class I
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	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.11%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.47%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.47%	[3]
1 year	rr_ExpenseExampleYear01	48
3 years	rr_ExpenseExampleYear03	151
5 years	rr_ExpenseExampleYear05	264
10 years	rr_ExpenseExampleYear10	594
1 year	rr_ExpenseExampleNoRedemptionYear01	48
3 years	rr_ExpenseExampleNoRedemptionYear03	151
5 years	rr_ExpenseExampleNoRedemptionYear05	264
10 years	rr_ExpenseExampleNoRedemptionYear10	594
1 year	rr_AverageAnnualReturnYear01	2.78%
5 years	rr_AverageAnnualReturnYear05	4.73%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.86%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 04, 2004
Columbia Limited Duration Credit Fund | Class K
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.41%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.77%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.77%	[3]
1 year	rr_ExpenseExampleYear01	79
3 years	rr_ExpenseExampleYear03	246
5 years	rr_ExpenseExampleYear05	429
10 years	rr_ExpenseExampleYear10	958
1 year	rr_ExpenseExampleNoRedemptionYear01	79
3 years	rr_ExpenseExampleNoRedemptionYear03	246
5 years	rr_ExpenseExampleNoRedemptionYear05	429
10 years	rr_ExpenseExampleNoRedemptionYear10	958
1 year	rr_AverageAnnualReturnYear01	2.48%
5 years	rr_AverageAnnualReturnYear05	4.57%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.72%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 19, 2003
Columbia Limited Duration Credit Fund | Class R4
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.64%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.60%	[3]
1 year	rr_ExpenseExampleYear01	61
3 years	rr_ExpenseExampleYear03	201
5 years	rr_ExpenseExampleYear05	353
10 years	rr_ExpenseExampleYear10	798
1 year	rr_ExpenseExampleNoRedemptionYear01	61
3 years	rr_ExpenseExampleNoRedemptionYear03	201
5 years	rr_ExpenseExampleNoRedemptionYear05	353
10 years	rr_ExpenseExampleNoRedemptionYear10	798
1 year	rr_AverageAnnualReturnYear01	2.42%	[6]
5 years	rr_AverageAnnualReturnYear05	4.35%	[6]
Life of Fund	rr_AverageAnnualReturnSinceInception	3.53%	[6]
Columbia Limited Duration Credit Fund | Class R5
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.16%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.52%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	none	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.52%	[3]
1 year	rr_ExpenseExampleYear01	53
3 years	rr_ExpenseExampleYear03	167
5 years	rr_ExpenseExampleYear05	291
10 years	rr_ExpenseExampleYear10	656
1 year	rr_ExpenseExampleNoRedemptionYear01	53
3 years	rr_ExpenseExampleNoRedemptionYear03	167
5 years	rr_ExpenseExampleNoRedemptionYear05	291
10 years	rr_ExpenseExampleNoRedemptionYear10	656
1 year	rr_AverageAnnualReturnYear01	2.42%
5 years	rr_AverageAnnualReturnYear05	4.35%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.53%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 08, 2012
Columbia Limited Duration Credit Fund | Class W
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.89%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.85%	[3]
1 year	rr_ExpenseExampleYear01	87
3 years	rr_ExpenseExampleYear03	280
5 years	rr_ExpenseExampleYear05	490
10 years	rr_ExpenseExampleYear10	1,097
1 year	rr_ExpenseExampleNoRedemptionYear01	87
3 years	rr_ExpenseExampleNoRedemptionYear03	280
5 years	rr_ExpenseExampleNoRedemptionYear05	490
10 years	rr_ExpenseExampleNoRedemptionYear10	1,097
1 year	rr_AverageAnnualReturnYear01	2.44%
5 years	rr_AverageAnnualReturnYear05	4.31%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.51%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 01, 2006
Columbia Limited Duration Credit Fund | Class Z
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.36%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.28%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.64%
Less: Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)	[3]
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.60%	[3]
1 year	rr_ExpenseExampleYear01	61
3 years	rr_ExpenseExampleYear03	201
5 years	rr_ExpenseExampleYear05	353
10 years	rr_ExpenseExampleYear10	798
1 year	rr_ExpenseExampleNoRedemptionYear01	61
3 years	rr_ExpenseExampleNoRedemptionYear03	201
5 years	rr_ExpenseExampleNoRedemptionYear05	353
10 years	rr_ExpenseExampleNoRedemptionYear10	798
1 year	rr_AverageAnnualReturnYear01	2.71%
5 years	rr_AverageAnnualReturnYear05	4.40%
Life of Fund	rr_AverageAnnualReturnSinceInception	3.56%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Limited Duration Credit Fund | shares returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	(1.61%)
5 years	rr_AverageAnnualReturnYear05	2.37%
Life of Fund	rr_AverageAnnualReturnSinceInception	1.90%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 19, 2003
Columbia Limited Duration Credit Fund | shares returns after taxes on distributions and redemption of fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	(0.44%)
5 years	rr_AverageAnnualReturnYear05	2.37%
Life of Fund	rr_AverageAnnualReturnSinceInception	1.94%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 19, 2003
Columbia Limited Duration Credit Fund | Barclays U.S. 1-5 Year Corporate Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.14%	[7]
5 years	rr_AverageAnnualReturnYear05	5.39%	[7]
Life of Fund	rr_AverageAnnualReturnSinceInception	4.28%	[7],[8]
Columbia Limited Duration Credit Fund | Barclays U.S. 1-5 Year Credit Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.04%	[7]
5 years	rr_AverageAnnualReturnYear05	5.29%	[7]
Life of Fund	rr_AverageAnnualReturnSinceInception	4.13%	[7]

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] Other expenses for Class A, Class B, Class C, Class K, Class W and Class Z shares have been restated to reflect contractual changes to certain fees paid by the Fund and other expenses for Class R4 and Class R5 shares are based on estimated amounts for the Fund's current fiscal year.

[3] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 0.85% for Class A, 1.60% for Class B, 1.60% for Class C, 0.49% for Class I, 0.79% for Class K, 0.60% for Class R4, 0.54% for Class R5, 0.85% for Class W and 0.60% for Class Z.

[4] This charge decreases over time.

[5] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[6] Class R4 shares of the Fund have not commenced operations as of the date of this prospectus.

[7] On December 1, 2011, the Barclays U.S. 1-5 Year Corporate Index (the New Index) replaced the Barclays U.S. 1-5 Year Credit Index (the Former Index) as the Fund's primary benchmark. The Fund's Investment Manager made this recommendation to the Fund's Board of Trustees because the Investment Manager believes that the New Index provides a more appropriate basis for comparing the Fund's performance. Information on both the New Index and the Former Index will be included for a one-year transition period. Thereafter, only the New Index will be included.

[8] Since Inception 6/30/03.

XML

Columbia Floating Rate Fund

Summary of the Fund

INVESTMENT OBJECTIVE

Columbia Floating Rate Fund (the Fund) seeks to provide shareholders with a high level of current income and,

as a secondary objective, preservation of capital.

FEES AND EXPENSES OF THE FUND

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 on Class A shares of the Fund if you and members of your immediate family (that share the same mailing address) agree to invest in the future at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. More information about these and other discounts is available from your financial intermediary and under “Reductions/Waivers of Sales Charges — Front-End Sales Charge Reductions” on page S.9 of this prospectus and on page D.1 of Appendix D in the Fund’s Statement of Additional Information (SAI).

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Columbia Floating Rate Fund	Class A		Class B		Class C		Class I	Class K	Class R	Class R4	Class R5	Class W	Class Z
Maximum sales charge (load) imposed on purchases, as a % of offering price	3.00%		none		none		none	none	none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	1.00%	[1]	5.00%	[2]	1.00%	[3]	none	none	none	none	none	none	none

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

Annual Fund Operating Expenses Columbia Floating Rate Fund		Class A	Class B	Class C	Class I	Class K	Class R	Class R4	Class R5	Class W	Class Z
Management fees		0.58%	0.58%	0.58%	0.58%	0.58%	0.58%	0.58%	0.58%	0.58%	0.58%
Distribution and/or service (12b-1) fees		0.25%	1.00%	1.00%	none	none	0.50%	none	none	0.25%	none
Other expenses	[1]	0.32%	0.32%	0.32%	0.14%	0.44%	0.32%	0.32%	0.19%	0.32%	0.32%
Total annual fund operating expenses		1.15%	1.90%	1.90%	0.72%	1.02%	1.40%	0.90%	0.77%	1.15%	0.90%
Less: Fee waiver/expense reimbursement	[2]	(0.06%)	(0.06%)	(0.06%)	none	none	(0.06%)	(0.06%)	none	(0.06%)	(0.06%)
Total annual fund operating expenses after fee waiver/expense reimbursement	[2]	1.09%	1.84%	1.84%	0.72%	1.02%	1.34%	0.84%	0.77%	1.09%	0.84%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expense table above.

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first year of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example Columbia Floating Rate Fund (USD $)	1 year	3 years	5 years	10 years
Class A	408	649	909	1,655
Class B	687	991	1,222	2,126
Class C	287	591	1,022	2,222
Class I	74	230	401	898
Class K	104	325	564	1,252
Class R	136	438	761	1,680
Class R4	86	281	493	1,107
Class R5	79	246	429	958
Class W	111	360	628	1,397
Class Z	86	281	493	1,107

Expense Example, No Redemption Columbia Floating Rate Fund (USD $)	1 year	3 years	5 years	10 years
Class A	408	649	909	1,655
Class B	187	591	1,022	2,026
Class C	187	591	1,022	2,222
Class I	74	230	401	898
Class K	104	325	564	1,252
Class R	136	438	761	1,680
Class R4	86	281	493	1,107
Class R5	79	246	429	958
Class W	111	360	628	1,397
Class Z	86	281	493	1,107

Portfolio Turnover

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 year, the Fund’s portfolio turnover rate was 42% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES OF THE FUND

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 floating rate loans and other floating rate debt securities. These debt obligations will generally be rated non-investment grade by recognized rating agencies (similar to “junk bonds”) or, if unrated, be considered to be of comparable quality. Up to 25% of the Fund’s net assets may be invested in foreign investments. The Fund will provide shareholders with at least 60 days’ written notice of any change in the 80% policy.

Floating rate loans are debt obligations of companies and other similar entities that have interest rates that adjust or “float” periodically (normally on a daily, monthly, quarterly or semiannual basis by reference to a base lending rate (such as LIBOR (London Interbank Offered Rate)) plus a premium). Floating rate loans are typically structured and administered by a financial institution that acts as the agent of the lenders participating in the floating rate loan. The Fund may acquire loans directly through the agent or from another holder of the loan by assignment. They are generally valued on a daily basis by independent pricing services.

The Fund normally invests in senior secured floating rate loans. Senior secured floating rate loans ordinarily are secured by specific collateral or assets of the borrower so that holders of the loans will have a claim on those assets senior to the claim of certain other parties in the event of default or bankruptcy by the borrower. These loans usually are senior in rank to other securities issued by the borrower (such as common stock or other debt instruments). The proceeds of the loan primarily are used by the borrower to finance leveraged buy-outs, recapitalizations, dividends to sponsors, mergers and acquisitions, and, to a lesser extent, to finance internal growth or for other corporate purposes. Senior floating rate loans held by the Fund will generally have final maturities of nine years or less.

To the extent the Fund invests in derivatives securities, the Fund may count the value of derivative securities with floating rate loan characteristics towards its 80% policy.

The Fund may also invest in other securities, including investment grade fixed income debt obligations, non-investment grade fixed income debt obligations and certain money market instruments. For purposes of the 80% policy, money market holdings with a remaining maturity of less than 60 days will be deemed floating rate assets.

PRINCIPAL RISKS OF INVESTING IN THE FUND

The Fund is designed for investors with above-average risk tolerance. Please remember that with any mutual fund investment you may lose money. Principal risks associated with an investment in the Fund include:

Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with a similar investment objective. The Fund may fail to achieve its investment objective and you may lose money.

Changing Distribution Level Risk. The amount of the distributions paid by the Fund will vary and generally depends on the amount of interest income and/or dividends received by the Fund on the securities it holds. The Fund may not be able to pay distributions or may have to reduce its distribution level if the interest income and/or dividends the Fund receives from its investments decline.

Confidential Information Access Risk. The Investment Manager normally will seek to avoid the receipt of material, non-public information (Confidential Information) about the issuers of floating rate loans (including from the issuer itself) being considered for acquisition by the Fund, or held in the Fund. The Investment Manager’s decision not to receive Confidential Information may disadvantage the Fund and could adversely affect the Fund’s performance.

Counterparty Risk. Counterparty risk is the risk that a counterparty to a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations, and the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed.

Credit Risk. Credit risk is the risk that loans or other securities in the Fund’s portfolio may or will decline in price or fail to pay interest or repay principal when due because the borrower of the loan or the issuer of the security may or will default or otherwise become unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations (such as making payments to the Fund), including as a result of bankruptcy. Bankruptcies may cause a delay to the Fund in acting on the collateral securing a loan, which may adversely affect the Fund. Further, there is risk that a court could take action adverse to the holders of a loan. A default or expected default of a loan could also make it difficult for the Fund to sell the loan at a price approximating the value previously placed on it. Lower quality or unrated loans or securities held by the Fund may present increased credit risk.

Foreign Securities Risk. Investments in foreign securities involve certain risks not associated with investments in securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country, including the political, regulatory, economic, social, diplomatic and other conditions or events occurring in the country or region, as well as fluctuations in its currency and the risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than investments in securities of U.S. companies.

Highly Leveraged Transactions Risk. The loans and other securities in which the Fund invests may include highly leveraged transactions whereby the borrower assumes large amounts of debt in order to have the financial resources to attempt to achieve its business objectives. Loans or securities that are part of highly leveraged transactions involve a greater risk (including default and bankruptcy) than other investments.

Impairment of Collateral Risk. The value of collateral, if any, securing a loan can decline, and may be insufficient to meet the borrower’s obligations or difficult or costly to liquidate. In addition, the Fund’s access to collateral may be limited by bankruptcy or other insolvency laws. Further, certain floating rate and other loans may not be fully collateralized and may decline in value.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt securities 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. In general, the longer the maturity or duration of a debt security, the greater its sensitivity to changes in interest rates. Interest rate changes also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Securities with floating interest rates are typically less sensitive to interest rate changes, but may decline in value if their interest rates do not rise as much as interest rates in general. Because rates on certain floating rate loans and other debt securities reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause fluctuations in the Fund’s net asset value.

Issuer Risk. An issuer in which the Fund invests may perform poorly, and therefore, the value of its securities may decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors.

Liquidity Risk. Liquidity risk is the risk associated with a lack of marketability of securities which may make it difficult to sell the security at desirable prices. The Fund may have to lower the selling price of its investment, sell other investments, or forego another, more appealing investment opportunity. Floating rate loans generally are subject to legal or contractual restrictions on resale, may trade infrequently, and their value may be impaired when the Fund needs to liquidate such loans. Loans and other securities may trade only in the over-the-counter market rather than on an organized exchange and may be more difficult to purchase or sell at a fair price, which may have a negative impact on the Fund’s performance.

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

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or even long periods. In general, equity securities tend to have greater price volatility than debt securities.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a loan, bond or other security or investment might be called or otherwise converted, prepaid or redeemed before maturity, and the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. 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.

Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.

PAST PERFORMANCE

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

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class includes 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. Class R4 shares of the Fund did not commence operations prior to the date of this prospectus and, therefore, performance is not yet available. The returns shown for all periods for any share class that does not have available performance are the returns of Class A shares (without applicable sales charges) of the Fund. Except for differences in expenses and sales charges (where applicable), the share classes of the Fund have annual returns substantially similar because all share classes of the Fund invest in the same portfolio of securities.

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

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

CLASS A ANNUAL TOTAL RETURNS (BEFORE SALES CHARGE)

(calendar year)

During the periods shown:

• Highest return for a calendar quarter was 16.99% (quarter ended June 30, 2009).
• Lowest return for a calendar quarter was –24.18% (quarter ended December 31, 2008).
• Class A year-to-date return was 8.34% at September 30, 2012.

Average Annual Total Returns After Applicable Sales Charges

(for periods ended December 31, 2011)

Average Annual Total Returns Columbia Floating Rate Fund		Share Class Inception Date	1 year	5 years	Life of Fund
Class A		Feb. 16, 2006	(1.99%)	1.82%	2.61%
Class A shares returns after taxes on distributions		Feb. 16, 2006	(3.49%)	(0.10%)	0.62%
Class A shares returns after taxes on distributions and redemption of fund shares		Feb. 16, 2006	(1.26%)	0.40%	1.04%
Class B		Feb. 16, 2006	(4.50%)	1.39%	2.26%
Class C		Feb. 16, 2006	(0.53%)	1.70%	2.39%
Class I		Feb. 16, 2006	1.44%	2.79%	3.48%
Class K		Feb. 16, 2006	1.18%	2.64%	3.32%
Class R		Sep. 27, 2010	0.86%	2.21%	2.91%
Class R4	[1]		1.09%	2.44%	3.14%
Class R5		Aug. 01, 2008	1.44%	2.65%	3.32%
Class W		Dec. 01, 2006	1.20%	2.37%	3.08%
Class Z		Sep. 27, 2010	1.36%	2.51%	3.20%
Credit Suisse Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)			1.82%	3.32%	3.85%	[2]

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] This charge decreases over time.

[3] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.

[1] Other expenses for Class A, Class B, Class C, Class K, Class R, Class R5, Class W and Class Z shares have been restated to reflect contractual changes to certain fees paid by the Fund and other expenses for Class R4 shares are based on estimated amounts for the Fund's current fiscal year.

[2] Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until November 30, 2013, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rates of 1.09% for Class A, 1.84% for Class B, 1.84% for Class C, 0.74% for Class I, 1.04% for Class K, 1.34% for Class R, 0.84% for Class R4, 0.79% for Class R5, 1.09% for Class W and 0.84% for Class Z.

[1] Class R4 shares of the Fund have not commenced operations as of the date of this prospectus.

[2] Credit Suisse Leveraged Loan Index Life return is as of 2/28/06.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012
Document Creation Date	dei_DocumentCreationDate	Nov. 27, 2012