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Risk/Return:rr_RiskReturnAbstract 
Document Typedei_DocumentTypeOther
Document Period End Datedei_DocumentPeriodEndDateMar. 07, 2011
Registrant Namedei_EntityRegistrantNameColumbia Funds Series Trust II
Central Index Keydei_EntityCentralIndexKey0001352280
Amendment Flagdei_AmendmentFlagfalse
Document Creation Datedei_DocumentCreationDateSep. 30, 2011
Document Effective Datedei_DocumentEffectiveDateSep. 30, 2011
Prospectus Daterr_ProspectusDateFeb. 18, 2011
Supplement [Text Block]rst1352280_SupplementTextBlock
Prospectus Supplement — September 30, 2011
to the Prospectuses listed below, each as supplemented
 FundProspectuses Dated
 Columbia Global Extended Alpha Fund12/30/2010
Effective September 30, 2011, the Fund compares its performance to the net dividends (Net) version of the Morgan Stanley Capital International (MSCI) All Country World Index rather than to the gross dividends (Gross) version currently reflected in the Fund’s prospectuses. Accordingly, the average annual total returns tables in the “Past Performance” sections of the Fund’s prospectuses are hereby replaced with the following and should be retained with the current prospectus for the Fund for future reference.
Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares
 
Risk/Return:rr_RiskReturnAbstract 
Supplement [Text Block]rst1352280_SupplementTextBlockThe average annual total returns table in the “Past Performance” section of the prospectus for Class A, Class B, Class C, Class I, Class R and Class R4 shares is hereby replaced with the following:
Average Annual Total Returnsrr_BarChartTableAbstract 
Captionrr_AverageAnnualReturnCaptionAverage Annual Total Returns (after applicable sales charges) (for periods ended December 31, 2010)
Performance Table Market Index Changedrr_PerformanceTableMarketIndexChangedOn September 30, 2011, the MSCI All Country World Index (Net) replaced the MSCI All Country World Index (Gross) as the Fund’s primary benchmark.
Performance Table Narrativerr_PerformanceTableNarrativeTextBlockFund performance information prior to March 7, 2011 represents that of the Fund as a series of RiverSource Global Series, Inc., a Minnesota corporation. The Fund was reorganized into a series of Columbia Funds Series Trust II, a Massachusetts business trust, on that date.
Columbia Global Extended Alpha Fund | Class Z Shares
 
Risk/Return:rr_RiskReturnAbstract 
Supplement [Text Block]rst1352280_SupplementTextBlockThe average annual total returns table in the “Past Performance” section of the prospectus for Class Z shares is hereby replaced with the following:
Average Annual Total Returnsrr_BarChartTableAbstract 
Captionrr_AverageAnnualReturnCaptionAverage Annual Total Returns (without sales charge) (for periods ended December 31, 2010)
Bar Chart, Returns for Class Not Offered in Prospectus [Text]rr_BarChartReturnsForClassNotOfferedInProspectusThe returns shown are for Class A shares without the applicable front-end sales charge. Class Z shares, which are sold without a sales charge, would have substantially similar annual returns as Class A shares because the classes of shares invest in the same portfolio of securities and would differ only to the extent that the classes do not have the same expenses. Class A share returns have not been adjusted to reflect differences in class-related expenses. If differences in class-related expenses were reflected (i.e., if expenses of Class Z shares were reflected in the Class A share returns), the returns shown for Class A shares for all periods would be higher.
Performance Table Market Index Changedrr_PerformanceTableMarketIndexChangedOn September 30, 2011, the MSCI All Country World Index (Net) replaced the MSCI All Country World Index (Gross) as the Fund's primary benchmark.
Performance Table Narrativerr_PerformanceTableNarrativeTextBlockFund performance information prior to March 7, 2011 represents that of the Fund as a series of RiverSource Global Series, Inc., a Minnesota corporation. The Fund was reorganized into a series of Columbia Funds Series Trust II, a Massachusetts business trust, on that date.
before taxes | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class A
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass A — before taxes
1 yearrr_AverageAnnualReturnYear0110.64%
Since inceptionrr_AverageAnnualReturnSinceInception1.96%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
before taxes | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class B
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass B — before taxes
1 yearrr_AverageAnnualReturnYear0111.48%
Since inceptionrr_AverageAnnualReturnSinceInception2.49%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
before taxes | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class C
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass C — before taxes
1 yearrr_AverageAnnualReturnYear0115.51%
Since inceptionrr_AverageAnnualReturnSinceInception3.70%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
before taxes | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class I
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass I — before taxes
1 yearrr_AverageAnnualReturnYear0117.80%
Since inceptionrr_AverageAnnualReturnSinceInception4.82%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
before taxes | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class R
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass R — before taxes
1 yearrr_AverageAnnualReturnYear0116.92%
Since inceptionrr_AverageAnnualReturnSinceInception4.06%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
before taxes | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class R4
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass R4 — before taxes
1 yearrr_AverageAnnualReturnYear0117.43%
Since inceptionrr_AverageAnnualReturnSinceInception4.57%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
before taxes | Columbia Global Extended Alpha Fund | Class Z Shares | Class A
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass A — before taxes[1]
1 yearrr_AverageAnnualReturnYear0117.40%
Since inceptionrr_AverageAnnualReturnSinceInception4.49%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
after taxes on distributions | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class A
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass A — after taxes on distributions
1 yearrr_AverageAnnualReturnYear0110.39%
Since inceptionrr_AverageAnnualReturnSinceInception1.49%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
after taxes on distributions | Columbia Global Extended Alpha Fund | Class Z Shares | Class A
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass A — after taxes on distributions[1]
1 yearrr_AverageAnnualReturnYear0117.13%
Since inceptionrr_AverageAnnualReturnSinceInception4.01%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
after taxes on distributions and redemption of fund shares | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares | Class A
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass A — after taxes on distributions and redemption of fund shares
1 yearrr_AverageAnnualReturnYear017.37%
Since inceptionrr_AverageAnnualReturnSinceInception1.45%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
after taxes on distributions and redemption of fund shares | Columbia Global Extended Alpha Fund | Class Z Shares | Class A
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Columnrr_AverageAnnualReturnColumnNameColumbia Global Extended Alpha Fund:
Labelrr_AverageAnnualReturnLabelClass A — after taxes on distributions and redemption of fund shares[1]
1 yearrr_AverageAnnualReturnYear0111.79%
Since inceptionrr_AverageAnnualReturnSinceInception3.61%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
Morgan Stanley Capital International (MSCI) All Country World Index (Net) | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Labelrr_AverageAnnualReturnLabelMorgan Stanley Capital International (MSCI) All Country World Index (Net)[2]
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects reinvested dividends net of withholding taxes but reflects no deduction for fees, expenses or other taxes)
1 yearrr_AverageAnnualReturnYear0112.67%
Since inceptionrr_AverageAnnualReturnSinceInception0.79%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
Morgan Stanley Capital International (MSCI) All Country World Index (Net) | Columbia Global Extended Alpha Fund | Class Z Shares
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Labelrr_AverageAnnualReturnLabelMorgan Stanley Capital International (MSCI) All Country World Index (Net)[2]
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects reinvested dividends net of withholding taxes but reflects no deduction for fees, expenses or other taxes)
1 yearrr_AverageAnnualReturnYear0112.67%
Since inceptionrr_AverageAnnualReturnSinceInception0.79%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
MSCI All Country World Index (Gross) | Columbia Global Extended Alpha Fund | Class A, B, C, I, R and R4 Shares
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Labelrr_AverageAnnualReturnLabelMSCI All Country World Index (Gross)[2]
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects no deduction for fees, expenses or taxes)
1 yearrr_AverageAnnualReturnYear0113.21%
Since inceptionrr_AverageAnnualReturnSinceInception1.33%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
MSCI All Country World Index (Gross) | Columbia Global Extended Alpha Fund | Class Z Shares
 
Average Annual Total Returnsrr_BarChartTableAbstract 
Labelrr_AverageAnnualReturnLabelMSCI All Country World Index (Gross)[2]
Index No Deduction for Fees, Expenses, Taxes [Text]rr_IndexNoDeductionForFeesExpensesTaxes(reflects no deduction for fees, expenses or taxes)
1 yearrr_AverageAnnualReturnYear0113.21%
Since inceptionrr_AverageAnnualReturnSinceInception1.33%
Inception Daterr_AverageAnnualReturnInceptionDateAug. 01, 2008
[1]The returns shown are for Class A shares without the applicable front-end sales charge. Class Z shares, which are sold without a sales charge, would have substantially similar annual returns as Class A shares because the classes of shares invest in the same portfolio of securities and would differ only to the extent that the classes do not have the same expenses. Class A share returns have not been adjusted to reflect differences in class-related expenses. If differences in class-related expenses were reflected (i.e., if expenses of Class Z shares were reflected in the Class A share returns), the returns shown for Class A shares for all periods would be higher.
[2]On September 30, 2011, the MSCI All Country World Index (Net) replaced the MSCI All Country World Index (Gross) as the Fund's primary benchmark. The Fund's investment manager made this recommendation to the Fund's Board because the investment manager believes that the Net version better reflects how dividends paid to the Fund on foreign securities generally are treated for tax purposes and, therefore, provides a more appropriate basis for comparing the Fund's performance. Information on both versions of the index will be included for a one-year transition period. Thereafter, only the Net version will be included.