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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName Columbia Funds Series Trust II
Prospectus Date rr_ProspectusDate Oct. 01, 2018
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Supplement dated December 14, 2018
to the Prospectus, as supplemented of the following fund (the Fund):
Fund Prospectus Dated
Columbia Funds Series Trust II  
 Columbia Commodity Strategy Fund 10/1/2018
Effective at the close of business on December 14, 2018, the shares held by Class T shareholders will be merged into Class A shares. Accordingly, at such time the information under the subsection "Performance Information" in the "Summary of the Fund" section of the Fund's Prospectus is hereby superseded and replaced with the following:
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. Class A share performance (without sales charges) is shown in the bar chart because Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public.
The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.
The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class T shares for the period from July 28, 2011 through June 17, 2012, and of the Fund’s Class A shares for periods from June 18, 2012 through the inception date of such class (in each case, without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such share class, where applicable). Additionally, the returns shown in the bar chart include the performance of the Fund’s Class T shares (without sales charges) for the period from January 1, 2012 through June 17, 2012 (performance of Class A shares is shown for all other periods since the Fund no longer offers Class T shares). Class T shares were offered prior to the Fund’s Class A shares but have since been merged into the Fund’s Class A shares. Share classes with expenses that are higher than Class T and/or Class A shares will have performance that is lower than Class T and/or Class A shares (without sales charges).
Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.
The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares. After-tax returns are shown for Class A shares because Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public
The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.
    
Year by Year Total Return (%)
as of December 31 Each Year* 		Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart
Best 2nd Quarter 2016 13.28%
Worst
 4th Quarter 2014 -14.74%
* Year to Date return as of September 30, 2018: -4.10%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)
  Share Class
Inception Date 		1 Year 5 Years Life of Fund*
Class A        
returns before taxes 06/18/2012 -4.43% -10.63% -9.44%
returns after taxes on distributions   -4.43% -10.63% -9.44%
returns after taxes on distributions and sale of Fund shares   -2.51% -7.63% -6.69%
Class Adv returns before taxes 03/19/2013 1.70% -9.36% -8.44%
Class C returns before taxes 06/18/2012 -0.25% -10.23% -9.29%
Class Inst returns before taxes 06/18/2012 1.71% -9.37% -8.44%
Class Inst2 returns before taxes 01/08/2014 1.73% -9.35% -8.44%
Class Inst3 returns before taxes 10/01/2014 1.94% -9.34% -8.43%
Class R returns before taxes 06/18/2012 1.28% -9.80% -8.84%
Bloomberg Commodity Index Total Return (reflects no deductions for fees, expenses or taxes)   1.70% -8.45% -8.99%
  
* Returns shown for periods prior to the inception date of a class include the returns of the Fund's Class T shares for the period from July 28, 2011 through June 17, 2012 and of the Fund's Class A shares for the periods from June 18, 2012 through the inception date of such class (in each case, without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such share class, where applicable). Class T shares were offered prior to the Fund's Class A shares but have since been merged into the Fund's Class A shares.
The rest of the section remains the same.
Columbia Commodity Strategy Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Supplement dated December 14, 2018
to the Prospectus, as supplemented of the following fund (the Fund):
Fund Prospectus Dated
Columbia Funds Series Trust II  
 Columbia Commodity Strategy Fund 10/1/2018
Effective at the close of business on December 14, 2018, the shares held by Class T shareholders will be merged into Class A shares. Accordingly, at such time the information under the subsection "Performance Information" in the "Summary of the Fund" section of the Fund's Prospectus is hereby superseded and replaced with the following:
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. Class A share performance (without sales charges) is shown in the bar chart because Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public.
The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.
The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class T shares for the period from July 28, 2011 through June 17, 2012, and of the Fund’s Class A shares for periods from June 18, 2012 through the inception date of such class (in each case, without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such share class, where applicable). Additionally, the returns shown in the bar chart include the performance of the Fund’s Class T shares (without sales charges) for the period from January 1, 2012 through June 17, 2012 (performance of Class A shares is shown for all other periods since the Fund no longer offers Class T shares). Class T shares were offered prior to the Fund’s Class A shares but have since been merged into the Fund’s Class A shares. Share classes with expenses that are higher than Class T and/or Class A shares will have performance that is lower than Class T and/or Class A shares (without sales charges).
Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.
The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares. After-tax returns are shown for Class A shares because Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public
The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.
    
Year by Year Total Return (%)
as of December 31 Each Year* 		Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart
Best 2nd Quarter 2016 13.28%
Worst
 4th Quarter 2014 -14.74%
* Year to Date return as of September 30, 2018: -4.10%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)
  Share Class
Inception Date 		1 Year 5 Years Life of Fund*
Class A        
returns before taxes 06/18/2012 -4.43% -10.63% -9.44%
returns after taxes on distributions   -4.43% -10.63% -9.44%
returns after taxes on distributions and sale of Fund shares   -2.51% -7.63% -6.69%
Class Adv returns before taxes 03/19/2013 1.70% -9.36% -8.44%
Class C returns before taxes 06/18/2012 -0.25% -10.23% -9.29%
Class Inst returns before taxes 06/18/2012 1.71% -9.37% -8.44%
Class Inst2 returns before taxes 01/08/2014 1.73% -9.35% -8.44%
Class Inst3 returns before taxes 10/01/2014 1.94% -9.34% -8.43%
Class R returns before taxes 06/18/2012 1.28% -9.80% -8.84%
Bloomberg Commodity Index Total Return (reflects no deductions for fees, expenses or taxes)   1.70% -8.45% -8.99%
  
* Returns shown for periods prior to the inception date of a class include the returns of the Fund's Class T shares for the period from July 28, 2011 through June 17, 2012 and of the Fund's Class A shares for the periods from June 18, 2012 through the inception date of such class (in each case, without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such share class, where applicable). Class T shares were offered prior to the Fund's Class A shares but have since been merged into the Fund's Class A shares.
The rest of the section remains the same.
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. Class A share performance (without sales charges) is shown in the bar chart because Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public.

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

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class T shares for the period from July 28, 2011 through June 17, 2012, and of the Fund’s Class A shares for periods from June 18, 2012 through the inception date of such class (in each case, without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such share class, where applicable). Additionally, the returns shown in the bar chart include the performance of the Fund’s Class T shares (without sales charges) for the period from January 1, 2012 through June 17, 2012 (performance of Class A shares is shown for all other periods since the Fund no longer offers Class T shares). Class T shares were offered prior to the Fund’s Class A shares but have since been merged into the Fund’s Class A shares. Share classes with expenses that are higher than Class T and/or Class A shares will have performance that is lower than Class T and/or Class A shares (without sales charges).

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

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

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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. Class A share performance (without sales charges) is shown in the bar chart because Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public.<br/><br/>The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.345.6611
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress columbiathreadneedleus.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <b>The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.</b>
Bar Chart [Heading] rr_BarChartHeading <b>Year by Year Total Return (%)<br/>as of December 31 Each Year
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          2nd Quarter 2016                                                         13.28%

Worst                                                       4th Quarter 2014                                                        -14.74%
Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text] rr_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod Class A share performance (without sales charges) is shown in the bar chart because Class A shares are the most common share class across the Columbia Funds complex that are available for investment by the general public.<br/><br/>Additionally, the returns shown in the bar chart include the performance of the Fund’s Class T shares (without sales charges) for the period from January 1, 2012 through June 17, 2012 (performance of Class A shares is shown for all other periods since the Fund no longer offers Class T shares). Class T shares were offered prior to the Fund’s Class A shares but have since been merged into the Fund’s Class A shares. Share classes with expenses that are higher than Class T and/or Class A shares will have performance that is lower than Class T and/or Class A shares (without sales charges).
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)</b>
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after-tax returns are shown only for Class A shares and will vary for other share classes.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Returns after taxes on distributions and sale of Fund shares are higher than before-tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod Returns shown for periods prior to the inception date of a class include the returns of the Fund's Class T shares for the period from July 28, 2011 through June 17, 2012 and of the Fund's Class A shares for the periods from June 18, 2012 through the inception date of such class (in each case, without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such share class, where applicable). Class T shares were offered prior to the Fund's Class A shares but have since been merged into the Fund's Class A shares.
Columbia Commodity Strategy Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
2012 rr_AnnualReturn2012 3.11% [1]
2013 rr_AnnualReturn2013 (11.11%) [1]
2014 rr_AnnualReturn2014 (21.36%) [1]
2015 rr_AnnualReturn2015 (23.92%) [1]
2016 rr_AnnualReturn2016 12.17% [1]
2017 rr_AnnualReturn2017 1.45% [1]
Year to Date Return, Label rr_YearToDateReturnLabel Year to Date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (4.10%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2014
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.74%)
1 Year rr_AverageAnnualReturnYear01 (4.43%)
5 Years rr_AverageAnnualReturnYear05 (10.63%)
Life of Fund rr_AverageAnnualReturnSinceInception (9.44%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 2012
Columbia Commodity Strategy Fund | Class Adv  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.70%
5 Years rr_AverageAnnualReturnYear05 (9.36%)
Life of Fund rr_AverageAnnualReturnSinceInception (8.44%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Mar. 19, 2013
Columbia Commodity Strategy Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.25%)
5 Years rr_AverageAnnualReturnYear05 (10.23%)
Life of Fund rr_AverageAnnualReturnSinceInception (9.29%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 2012
Columbia Commodity Strategy Fund | Class Inst  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.71%
5 Years rr_AverageAnnualReturnYear05 (9.37%)
Life of Fund rr_AverageAnnualReturnSinceInception (8.44%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 2012
Columbia Commodity Strategy Fund | Class Inst2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.73%
5 Years rr_AverageAnnualReturnYear05 (9.35%)
Life of Fund rr_AverageAnnualReturnSinceInception (8.44%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Jan. 08, 2014
Columbia Commodity Strategy Fund | Class Inst3  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.94%
5 Years rr_AverageAnnualReturnYear05 (9.34%)
Life of Fund rr_AverageAnnualReturnSinceInception (8.43%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2014
Columbia Commodity Strategy Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.28%
5 Years rr_AverageAnnualReturnYear05 (9.80%)
Life of Fund rr_AverageAnnualReturnSinceInception (8.84%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 2012
Columbia Commodity Strategy Fund | returns after taxes on distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.43%)
5 Years rr_AverageAnnualReturnYear05 (10.63%)
Life of Fund rr_AverageAnnualReturnSinceInception (9.44%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 2012
Columbia Commodity Strategy Fund | returns after taxes on distributions and sale of Fund shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.51%)
5 Years rr_AverageAnnualReturnYear05 (7.63%)
Life of Fund rr_AverageAnnualReturnSinceInception (6.69%) [2]
Share Class Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 2012
Columbia Commodity Strategy Fund | Bloomberg Commodity Index Total Return (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.70%
5 Years rr_AverageAnnualReturnYear05 (8.45%)
Life of Fund rr_AverageAnnualReturnSinceInception (8.99%) [2]
[1] Year to Date return as of September 30, 2018: -4.10%
[2] Returns shown for periods prior to the inception date of a class include the returns of the Fund's Class T shares for the period from July 28, 2011 through June 17, 2012 and of the Fund's Class A shares for the periods from June 18, 2012 through the inception date of such class (in each case, without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such share class, where applicable). Class T shares were offered prior to the Fund's Class A shares but have since been merged into the Fund's Class A shares.