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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName Columbia Funds Series Trust II
Prospectus Date rr_ProspectusDate Aug. 14, 2012
Supplement [Text Block] cfst20_SupplementTextBlock

Prospectus Supplement — Aug. 14, 2012

to the Prospectuses, as supplemented, of the following fund:

Fund    Prospectuses Dated

Columbia U.S. Government Mortgage Fund

    Aug. 1, 2011 and June 18, 2012

The following changes are hereby made to the prospectuses of the Fund:

FEES AND EXPENSES OF THE FUND

The fee and expense table in the section entitled “Fees and Expenses of the Fund” is hereby replaced with the following:

 

Shareholder Fees (fees paid directly from your investment)                            
     Class A      Class B      Class C      Class I, R4, W, Z  

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

      4.75 %       None         None         None   
           

Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less)

      1 %       5 %       1 %       None   

 

Annual Fund Operating Expenses(a)
(expenses that you pay each year as a percentage of the value of your investment)		                          
     Class A     Class B     Class C     Class I     Class R4     Class W     Class Z  

Management fees

      0.43 %      0.43 %      0.43 %      0.43 %      0.43 %      0.43 %      0.43 % 
              

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

      0.25 %      1.00 %      1.00 %      0.00 %      0.00 %      0.25 %      0.00 % 
              

Other expenses(b)

      0.27 %      0.27 %      0.27 %      0.10 %      0.40 %      0.27 %      0.27 % 
              

Total annual fund operating expenses

      0.95 %      1.70 %      1.70 %      0.53 %      0.83 %      0.95 %      0.70 % 
              

Less: Fee waiver/expense reimbursement(c)

      (0.09 %)      (0.09 %)      (0.09 %)      (0.03 %)      (0.03 %)      (0.09 %)      (0.09 %) 
              

Total annual fund operating expenses after fee waiver/expense reimbursement(c)

      0.86 %      1.61 %      1.61 %      0.50 %      0.80 %      0.86 %      0.61 % 

 

(a) 

Expense ratios have been adjusted to reflect current fees.

(b) 

Other expenses for Class W shares are based on estimated amounts for the current fiscal year.

(c) 

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 September 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 0.86% for Class A, 1.61% for Class B, 1.61% for Class C, 0.50% for Class I, 0.80% for Class R4, 0.86% for Class W and 0.61% for Class Z.

The Example in the section entitled “Fees and Expenses of the Fund” is hereby replaced with the following:

Example

The 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 assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem your shares at the end of those periods (unless otherwise noted). The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example includes contractual commitments to waive fees and reimburse expenses expiring as indicated in the preceding table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

 

     1 year      3 years      5 years      10 years  

Class A (whether or not shares are redeemed)

    $ 559       $ 755       $ 968       $ 1,582   
           

Class B (if shares are redeemed)

    $ 664       $ 827       $ 1,116       $ 1,806   
           

Class B (if shares are not redeemed)

    $ 164       $ 527       $ 916       $ 1,806   
           

Class C (if shares are redeemed)

    $ 264       $ 527       $ 916       $ 2,006   
           

Class C (if shares are not redeemed)

    $ 164       $ 527       $ 916       $ 2,006   
           

Class I (whether or not shares are redeemed)

    $ 51       $ 167       $ 294       $ 665   
           

Class R4 (whether or not shares are redeemed)

    $ 82       $ 262       $ 458       $ 1,027   
           

Class W (whether or not shares are redeemed)

    $ 88       $ 294       $ 518       $ 1,163   
           

Class Z (whether or not shares are redeemed)

    $ 62       $ 215       $ 381       $ 866   
Columbia U.S. Government Mortgage Fund
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfst20_SupplementTextBlock

Prospectus Supplement — Aug. 14, 2012

to the Prospectuses, as supplemented, of the following fund:

Fund    Prospectuses Dated

Columbia U.S. Government Mortgage Fund

    Aug. 1, 2011 and June 18, 2012

The following changes are hereby made to the prospectuses of the Fund:

FEES AND EXPENSES OF THE FUND

The fee and expense table in the section entitled “Fees and Expenses of the Fund” is hereby replaced with the following:

 

Shareholder Fees (fees paid directly from your investment)                            
     Class A      Class B      Class C      Class I, R4, W, Z  

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

      4.75 %       None         None         None   
           

Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less)

      1 %       5 %       1 %       None   

 

Annual Fund Operating Expenses(a)
(expenses that you pay each year as a percentage of the value of your investment)		                          
     Class A     Class B     Class C     Class I     Class R4     Class W     Class Z  

Management fees

      0.43 %      0.43 %      0.43 %      0.43 %      0.43 %      0.43 %      0.43 % 
              

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

      0.25 %      1.00 %      1.00 %      0.00 %      0.00 %      0.25 %      0.00 % 
              

Other expenses(b)

      0.27 %      0.27 %      0.27 %      0.10 %      0.40 %      0.27 %      0.27 % 
              

Total annual fund operating expenses

      0.95 %      1.70 %      1.70 %      0.53 %      0.83 %      0.95 %      0.70 % 
              

Less: Fee waiver/expense reimbursement(c)

      (0.09 %)      (0.09 %)      (0.09 %)      (0.03 %)      (0.03 %)      (0.09 %)      (0.09 %) 
              

Total annual fund operating expenses after fee waiver/expense reimbursement(c)

      0.86 %      1.61 %      1.61 %      0.50 %      0.80 %      0.86 %      0.61 % 

 

(a) 

Expense ratios have been adjusted to reflect current fees.

(b) 

Other expenses for Class W shares are based on estimated amounts for the current fiscal year.

(c) 

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 September 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 0.86% for Class A, 1.61% for Class B, 1.61% for Class C, 0.50% for Class I, 0.80% for Class R4, 0.86% for Class W and 0.61% for Class Z.

The Example in the section entitled “Fees and Expenses of the Fund” is hereby replaced with the following:

Example

The 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 assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem your shares at the end of those periods (unless otherwise noted). The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example includes contractual commitments to waive fees and reimburse expenses expiring as indicated in the preceding table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

 

     1 year      3 years      5 years      10 years  

Class A (whether or not shares are redeemed)

    $ 559       $ 755       $ 968       $ 1,582   
           

Class B (if shares are redeemed)

    $ 664       $ 827       $ 1,116       $ 1,806   
           

Class B (if shares are not redeemed)

    $ 164       $ 527       $ 916       $ 1,806   
           

Class C (if shares are redeemed)

    $ 264       $ 527       $ 916       $ 2,006   
           

Class C (if shares are not redeemed)

    $ 164       $ 527       $ 916       $ 2,006   
           

Class I (whether or not shares are redeemed)

    $ 51       $ 167       $ 294       $ 665   
           

Class R4 (whether or not shares are redeemed)

    $ 82       $ 262       $ 458       $ 1,027   
           

Class W (whether or not shares are redeemed)

    $ 88       $ 294       $ 518       $ 1,163   
           

Class Z (whether or not shares are redeemed)

    $ 62       $ 215       $ 381       $ 866   
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES 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 September 30, 2013
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses for Class W shares are based on estimated amounts for the current fiscal year.
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expense ratios have been adjusted to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The 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 assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem your shares at the end of those periods (unless otherwise noted). The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example includes contractual commitments to waive fees and reimburse expenses expiring as indicated in the preceding table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Columbia U.S. Government Mortgage Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.43% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other expenses rr_OtherExpensesOverAssets 0.27% [1],[2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.95% [1]
Less: Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [1],[3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.86% [1],[3]
1 year rr_ExpenseExampleYear01 559
3 years rr_ExpenseExampleYear03 755
5 years rr_ExpenseExampleYear05 968
10 years rr_ExpenseExampleYear10 1,582
1 year rr_ExpenseExampleNoRedemptionYear01 559
3 years rr_ExpenseExampleNoRedemptionYear03 755
5 years rr_ExpenseExampleNoRedemptionYear05 968
10 years rr_ExpenseExampleNoRedemptionYear10 1,582
Columbia U.S. Government Mortgage Fund | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less) rr_MaximumDeferredSalesChargeOverOther 5.00%
Management fees rr_ManagementFeesOverAssets 0.43% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00% [1]
Other expenses rr_OtherExpensesOverAssets 0.27% [1],[2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.70% [1]
Less: Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [1],[3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 1.61% [1],[3]
1 year rr_ExpenseExampleYear01 664
3 years rr_ExpenseExampleYear03 827
5 years rr_ExpenseExampleYear05 1,116
10 years rr_ExpenseExampleYear10 1,806
1 year rr_ExpenseExampleNoRedemptionYear01 164
3 years rr_ExpenseExampleNoRedemptionYear03 527
5 years rr_ExpenseExampleNoRedemptionYear05 916
10 years rr_ExpenseExampleNoRedemptionYear10 1,806
Columbia U.S. Government Mortgage Fund | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.43% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00% [1]
Other expenses rr_OtherExpensesOverAssets 0.27% [1],[2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.70% [1]
Less: Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [1],[3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 1.61% [1],[3]
1 year rr_ExpenseExampleYear01 264
3 years rr_ExpenseExampleYear03 527
5 years rr_ExpenseExampleYear05 916
10 years rr_ExpenseExampleYear10 2,006
1 year rr_ExpenseExampleNoRedemptionYear01 164
3 years rr_ExpenseExampleNoRedemptionYear03 527
5 years rr_ExpenseExampleNoRedemptionYear05 916
10 years rr_ExpenseExampleNoRedemptionYear10 2,006
Columbia U.S. Government Mortgage Fund | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.43% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other expenses rr_OtherExpensesOverAssets 0.10% [1],[2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.53% [1]
Less: Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1],[3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.50% [1],[3]
1 year rr_ExpenseExampleYear01 51
3 years rr_ExpenseExampleYear03 167
5 years rr_ExpenseExampleYear05 294
10 years rr_ExpenseExampleYear10 665
1 year rr_ExpenseExampleNoRedemptionYear01 51
3 years rr_ExpenseExampleNoRedemptionYear03 167
5 years rr_ExpenseExampleNoRedemptionYear05 294
10 years rr_ExpenseExampleNoRedemptionYear10 665
Columbia U.S. Government Mortgage Fund | Class R4
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.43% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other expenses rr_OtherExpensesOverAssets 0.40% [1],[2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.83% [1]
Less: Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1],[3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.80% [1],[3]
1 year rr_ExpenseExampleYear01 82
3 years rr_ExpenseExampleYear03 262
5 years rr_ExpenseExampleYear05 458
10 years rr_ExpenseExampleYear10 1,027
1 year rr_ExpenseExampleNoRedemptionYear01 82
3 years rr_ExpenseExampleNoRedemptionYear03 262
5 years rr_ExpenseExampleNoRedemptionYear05 458
10 years rr_ExpenseExampleNoRedemptionYear10 1,027
Columbia U.S. Government Mortgage Fund | Class W
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.43% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other expenses rr_OtherExpensesOverAssets 0.27% [1],[2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.95% [1]
Less: Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [1],[3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.86% [1],[3]
1 year rr_ExpenseExampleYear01 88
3 years rr_ExpenseExampleYear03 294
5 years rr_ExpenseExampleYear05 518
10 years rr_ExpenseExampleYear10 1,163
1 year rr_ExpenseExampleNoRedemptionYear01 88
3 years rr_ExpenseExampleNoRedemptionYear03 294
5 years rr_ExpenseExampleNoRedemptionYear05 518
10 years rr_ExpenseExampleNoRedemptionYear10 1,163
Columbia U.S. Government Mortgage Fund | Class Z
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) imposed on redemptions (as a percentage of offering price at the time of purchase, or current net asset value, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.43% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other expenses rr_OtherExpensesOverAssets 0.27% [1],[2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.70% [1]
Less: Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [1],[3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.61% [1],[3]
1 year rr_ExpenseExampleYear01 62
3 years rr_ExpenseExampleYear03 215
5 years rr_ExpenseExampleYear05 381
10 years rr_ExpenseExampleYear10 866
1 year rr_ExpenseExampleNoRedemptionYear01 62
3 years rr_ExpenseExampleNoRedemptionYear03 215
5 years rr_ExpenseExampleNoRedemptionYear05 381
10 years rr_ExpenseExampleNoRedemptionYear10 866
[1] Expense ratios have been adjusted to reflect current fees.
[2] Other expenses for Class W shares are based on estimated amounts for the 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 September 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 0.86% for Class A, 1.61% for Class B, 1.61% for Class C, 0.50% for Class I, 0.80% for Class R4, 0.86% for Class W and 0.61% for Class Z.