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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName COLUMBIA FUNDS SERIES TRUST I
Prospectus Date rr_ProspectusDate Mar. 10, 2017
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Convertible Securities Fund 7/1/2016
 Columbia Large Cap Growth Fund III 10/1/2016
 Columbia Mid Cap Value Fund 7/1/2016
 Columbia Overseas Value Fund 7/1/2016
 Columbia Select International Equity Fund 7/1/2016
 Columbia Select Large Cap Equity Fund 7/1/2016
 Columbia Short Term Bond Fund 8/1/2016
 Columbia Small Cap Index Fund 7/1/2016
Columbia Funds Series Trust I  
 Columbia Adaptive Risk Allocation Fund 10/1/2016
 Columbia AMT-Free Intermediate Muni Bond Fund 3/1/2017
 Columbia Alternative Beta Fund 10/1/2016
 Columbia Balanced Fund 1/1/2017
 Columbia Bond Fund 9/1/2016
 Columbia Contrarian Core Fund 1/1/2017
 Columbia Corporate Income Fund 9/1/2016
 Columbia Disciplined Small Core Fund 1/1/2017
 Columbia Diversified Absolute Return Fund 10/1/2016
 Columbia Diversified Real Return Fund 6/1/2016
 Columbia Dividend Income Fund 10/1/2016
 Columbia Emerging Markets Fund 1/1/2017
 Columbia Global Dividend Opportunity Fund 1/1/2017
 Columbia Global Energy and Natural Resources Fund 1/1/2017
 Columbia Global Technology Growth Fund 1/1/2017
 Columbia Greater China Fund 1/1/2017
 Columbia Large Cap Growth Fund 12/1/2016
 Columbia Mid Cap Growth Fund 1/1/2017
 Columbia Multi-Asset Income Fund 9/1/2016
 Columbia Pacific/Asia Fund 8/1/2016
 Columbia Real Estate Equity Fund 5/1/2016
 Columbia Select Large Cap Growth Fund 8/1/2016
 Columbia Small Cap Growth Fund I 1/1/2017
 Columbia Strategic Income Fund 3/1/2017
 Columbia Total Return Bond Fund 9/1/2016
 Columbia U.S. Treasury Index Fund 9/1/2016
Columbia Funds Series Trust II  
 Columbia Absolute Return Currency and Income Fund 3/1/2017
 Columbia Commodity Strategy Fund 10/1/2016
 Columbia Disciplined Core Fund 12/1/2016
 Columbia Disciplined Growth Fund 12/1/2016
 Columbia Disciplined Value Fund 12/1/2016
 Columbia Diversified Equity Income Fund 10/1/2016
 Columbia Dividend Opportunity Fund 10/1/2016
 Columbia Emerging Markets Bond Fund 3/1/2017
 Columbia European Equity Fund 3/1/2017
 Columbia Flexible Capital Income Fund 10/1/2016
 Columbia Floating Rate Fund 12/1/2016
 Columbia Global Bond Fund 3/1/2017
 Columbia Global Equity Value Fund 7/1/2016
 Columbia Global Opportunities Fund 12/1/2016
 Columbia Government Money Market Fund 10/1/2016
 Columbia High Yield Bond Fund 10/1/2016
 Columbia Income Builder Fund 6/1/2016
 Columbia Income Opportunities Fund 12/1/2016
 Columbia Inflation Protected Securities Fund 12/1/2016
 Columbia Limited Duration Credit Fund 12/1/2016
 Columbia Mortgage Opportunities Fund 10/1/2016
 Columbia Select Global Equity Fund 3/1/2017
 Columbia Select Large-Cap Value Fund 10/1/2016
 Columbia Small/Mid Cap Value Fund 10/1/2016
 Columbia U.S. Government Mortgage Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.
Effective immediately, the information on the cover of the Prospectus and Summary Prospectus for Columbia AMT-Free Intermediate Muni Bond Fund and Columbia Balanced Fund is hereby revised to reflect that, effective on or about April 3, 2017, Class T shares (formerly Class W) will commence operations under the following ticker symbols:  
  Columbia Balanced Fund – Class W: CBDTX
  Columbia AMT-Free Intermediate Muni Bond Fund – Class W: CAFTX

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Absolute Return Currency and Income Fund $415 $ 760 $1,130 $2,166
   Columbia Adaptive Risk Allocation Fund $374 $ 643 $ 932 $1,754
   Columbia Alternative Beta Fund $387 $ 688 $1,058 $2,096
   Columbia AMT-Free Intermediate Muni Bond Fund $333 $ 525 $ 734 $1,334
   Columbia Balanced Fund $349 $ 560 $ 789 $1,444
   Columbia Bond Fund $336 $ 549 $ 780 $1,442
   Columbia Commodity Strategy Fund $393 $ 702 $1,034 $1,971
   Columbia Contrarian Core Fund $355 $ 579 $ 820 $1,512
   Columbia Convertible Securities Fund $362 $ 619 $ 895 $1,683
   Columbia Corporate Income Fund $342 $ 549 $ 772 $1,416
   Columbia Disciplined Core Fund $353 $ 573 $ 810 $1,489
   Columbia Disciplined Growth Fund $369 $ 636 $ 923 $1,740
   Columbia Disciplined Small Core Fund $388 $ 683 $1,000 $1,897
   Columbia Disciplined Value Fund $364 $ 617 $ 888 $1,664
   Columbia Diversified Absolute Return Fund $465 $1,076 $1,713 $3,419
   Columbia Diversified Equity Income Fund $353 $ 573 $ 810 $1,489
   Columbia Diversified Real Return Fund $370 $ 927 $1,510 $3,090
   Columbia Dividend Income Fund $351 $ 567 $ 799 $1,467
   Columbia Dividend Opportunity Fund $350 $ 564 $ 794 $1,455
   Columbia Emerging Markets Bond Fund $367 $ 620 $ 891 $1,666
   Columbia Emerging Markets Fund $410 $ 762 $1,138 $2,191
   Columbia European Equity Fund $384 $ 667 $ 971 $1,833
   Columbia Flexible Capital Income Fund $367 $ 615 $ 883 $1,646
   Columbia Floating Rate Fund $353 $ 577 $ 818 $1,510
   Columbia Global Bond Fund $353 $ 654 $ 976 $1,888
   Columbia Global Dividend Opportunity Fund $384 $ 704 $1,047 $2,013
   Columbia Global Energy and Natural Resources Fund $384 $ 667 $ 971 $1,833
   Columbia Global Equity Value Fund $367 $ 615 $ 883 $1,646
   Columbia Global Opportunities Fund $370 $ 624 $ 898 $1,679
   Columbia Global Technology Growth Fund $383 $ 664 $ 966 $1,822
   Columbia Government Money Market Fund $312 $ 475 $ 653 $1,167
   Columbia Greater China Fund $411 $ 748 $1,109 $2,124
   Columbia High Yield Bond Fund $355 $ 579 $ 820 $1,512
   Columbia Income Builder Fund $351 $ 567 $ 799 $1,467
   Columbia Income Opportunities Fund $356 $ 594 $ 851 $1,585
   Columbia Inflation Protected Securities Fund $330 $ 547 $ 783 $1,458
   Columbia Large Cap Growth Fund $359 $ 591 $ 841 $1,557
   Columbia Large Cap Growth Fund III $371 $ 628 $ 904 $1,690
   Columbia Limited Duration Credit Fund $330 $ 516 $ 718 $1,300
   Columbia Mid Cap Growth Fund $369 $ 621 $ 893 $1,668
   Columbia Mid Cap Value Fund $366 $ 612 $ 878 $1,635
   Columbia Mortgage Opportunities Fund $349 $ 592 $ 853 $1,600
   Columbia Multi-Asset Income Fund $348 $ 622 $ 916 $1,752
   Columbia Overseas Value Fund $388 $ 679 $ 991 $1,877
   Columbia Pacific/Asia Fund $399 $ 712 $1,048 $1,996
   Columbia Real Estate Equity Fund $373 $ 634 $ 914 $1,712
   Columbia Select Global Equity Fund $388 $ 679 $ 991 $1,877
   Columbia Select International Equity Fund $389 $ 686 $1,005 $1,908
   Columbia Select Large Cap Equity Fund $366 $ 627 $ 907 $1,706
   Columbia Select Large Cap Growth Fund $356 $ 582 $ 825 $1,523
   Columbia Select Large-Cap Value Fund $364 $ 617 $ 888 $1,664
   Columbia Short Term Bond Fund $330 $ 516 $ 718 $1,300
   Columbia Small Cap Growth Fund I $384 $ 679 $ 996 $1,894
   Columbia Small Cap Index Fund $295 $ 391 $ 496 $ 803
   Columbia Small/Mid Cap Value Fund $374 $ 637 $ 919 $1,724
   Columbia Strategic Income Fund $350 $ 564 $ 794 $1,455
   Columbia Total Return Bond Fund $336 $ 526 $ 732 $1,327
   Columbia U.S. Government Mortgage Fund $340 $ 544 $ 766 $1,404
   Columbia U.S. Treasury Index Fund $295 $ 435 $ 588 $1,033

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Adaptive Risk Allocation Fund 06/19/2012 -7.23% NA NA 1.17%
Columbia Bond Fund 09/27/2010 -2.62% 2.31% 3.75% NA
Columbia Commodity Strategy Fund 07/28/2011        
   returns before taxes   -25.90% NA NA -15.30%
   returns after taxes on distributions   -25.90% NA NA -15.30%
   returns after taxes on distributions
   and sale of Fund shares
  -14.66% NA NA -10.78%
Columbia Contrarian Core Fund 09/27/2010 0.26% 12.32% 8.91% NA
Columbia Convertible Securities Fund 11/16/2011 -7.01% 6.04% 5.05% NA
Columbia Corporate Income Fund 09/27/2010 -5.98% 3.39% 4.50% NA
Columbia Disciplined Core Fund 12/01/2006 -1.66% 12.95% 6.78% NA
Columbia Disciplined Growth Fund 08/01/2008 4.21% 13.47% NA 6.78%
Columbia Disciplined Small Core Fund 09/27/2010 -9.91% 5.94% 5.80% NA
Columbia Disciplined Value Fund 08/01/2008 -6.43% 11.41% NA 6.61%
Columbia Diversified Equity Income Fund 12/01/2006 -4.81% 8.60% 5.55% NA
Columbia Diversified Real Return Fund 06/25/2014 -8.31% NA NA -6.38%
Columbia Dividend Income Fund 09/27/2010 -2.18% 10.81% 7.46% NA
Columbia Dividend Opportunity Fund 12/01/2006 -5.04% 9.55% 7.02% NA
Columbia Emerging Markets Fund 09/27/2010 -11.67% -3.34% 2.98% NA
Columbia Flexible Capital Income Fund 07/28/2011 -8.73% NA NA 5.88%
Columbia Floating Rate Fund 12/01/2006 -2.81% 2.90% NA 3.18%
Columbia Global Dividend Opportunity Fund 09/27/2010 -9.10% 3.04% 3.61% NA
Columbia Global Equity Value Fund 12/01/2006 -8.26% 6.73% 4.67% NA
Columbia Global Opportunities Fund 06/25/2014 -3.25% 4.67% 3.63% NA
Columbia Government Money Market Fund 12/01/2006 -2.90% -0.58% 0.85% NA
Columbia Greater China Fund 06/18/2012 -3.09% 1.43% 10.10% NA
Columbia High Yield Bond Fund 12/01/2006 -3.55% 5.08% 6.32% NA
Columbia Income Builder Fund 06/25/2014 -4.01% 4.46% NA 4.92%
Columbia Income Opportunities Fund 09/27/2010 -3.59% 4.84% 6.07% NA
Columbia Inflation Protected Securities Fund 12/01/2006 -8.42% 0.58% 2.48% NA
Columbia Large Cap Growth Fund 09/27/2010 6.09% 12.89% 8.05% NA
Columbia Limited Duration Credit Fund 12/01/2006 -4.32% 1.05% 2.84% NA
Columbia Mid Cap Growth Fund 09/27/2010 2.35% 8.63% 7.72% NA
Columbia Mid Cap Value Fund 09/27/2010 -7.57% 9.32% 6.35% NA
Columbia Mortgage Opportunities Fund 04/30/2014 -0.26% NA NA 1.18%
Columbia Overseas Value Fund 03/31/2011 1.48% 4.05% NA 0.18%
Columbia Pacific/Asia Fund 06/18/2012 0.54% 2.44% 3.24% NA
Columbia Real Estate Equity Fund 09/27/2010 1.70% 10.27% 6.49% NA
Columbia Select International Equity Fund 09/27/2010 -0.99% 1.69% 1.62% NA
Columbia Select Large Cap Equity Fund 09/27/2010 0.94% 11.03% 6.85% NA
Columbia Select Large Cap Growth Fund 09/27/2010 4.90% 12.65% 9.01% NA
Columbia Select Large-Cap Value Fund 09/27/2010 -8.20% 10.25% 6.21% NA
Columbia Short Term Bond Fund 09/27/2010 -2.38% 0.41% 2.30% NA
Columbia Small Cap Index Fund 06/25/2014 -4.92% 10.42% 7.33% NA
Columbia Small/Mid Cap Value Fund 12/01/2006 -8.71% 7.29% 5.77% NA
Columbia Total Return Bond Fund 09/27/2010 -2.44% 2.69% 4.12% NA
Columbia U.S. Government Mortgage Fund 06/18/2012 -1.43% 3.59% 4.58% NA
Columbia U.S. Treasury Index Fund 06/18/2012 -2.24% 1.79% 3.30% NA
For the periods ended December 31, 2016
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years
Columbia Absolute Return Currency and Income Fund 12/01/2006 -0.60% 3.75% 2.74%
Columbia Emerging Markets Bond Fund 12/01/2006 9.34% 4.06% 6.05%
Columbia European Equity Fund 06/18/2012 -9.10% 5.68% 2.41%
Columbia Global Bond Fund 12/01/2006 -3.86% -2.53% 1.53%
Columbia Select Global Equity Fund 12/01/2006 -3.25% 7.83% 2.44%
Columbia Strategic Income Fund 09/27/2010 5.34% 4.08% 5.28%

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Convertible Securities Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Convertible Securities Fund 7/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Convertible Securities Fund $362 $ 619 $ 895 $1,683

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Convertible Securities Fund 11/16/2011 -7.01% 6.04% 5.05% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Large Cap Growth Fund III  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Large Cap Growth Fund III 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Large Cap Growth Fund III $371 $ 628 $ 904 $1,690

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Mid Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Mid Cap Value Fund 7/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Mid Cap Value Fund $366 $ 612 $ 878 $1,635

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Mid Cap Value Fund 09/27/2010 -7.57% 9.32% 6.35% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Overseas Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Overseas Value Fund 7/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Overseas Value Fund $388 $ 679 $ 991 $1,877

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Overseas Value Fund 03/31/2011 1.48% 4.05% NA 0.18%

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Select International Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Select International Equity Fund 7/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Select International Equity Fund $389 $ 686 $1,005 $1,908

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Select International Equity Fund 09/27/2010 -0.99% 1.69% 1.62% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Select Large Cap Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Select Large Cap Equity Fund 7/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Select Large Cap Equity Fund $366 $ 627 $ 907 $1,706

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Select Large Cap Equity Fund 09/27/2010 0.94% 11.03% 6.85% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Short Term Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Short Term Bond Fund 8/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Short Term Bond Fund $330 $ 516 $ 718 $1,300

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Short Term Bond Fund 09/27/2010 -2.38% 0.41% 2.30% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST | Columbia Small Cap Index Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust  
 Columbia Small Cap Index Fund 7/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Small Cap Index Fund $295 $ 391 $ 496 $ 803

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Small Cap Index Fund 06/25/2014 -4.92% 10.42% 7.33% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Adaptive Risk Allocation Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Adaptive Risk Allocation Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Adaptive Risk Allocation Fund $374 $ 643 $ 932 $1,754

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Adaptive Risk Allocation Fund 06/19/2012 -7.23% NA NA 1.17%

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia AMT-Free Intermediate Muni Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia AMT-Free Intermediate Muni Bond Fund 3/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.
Effective immediately, the information on the cover of the Prospectus and Summary Prospectus for Columbia AMT-Free Intermediate Muni Bond Fund and Columbia Balanced Fund is hereby revised to reflect that, effective on or about April 3, 2017, Class T shares (formerly Class W) will commence operations under the following ticker symbols:  
  Columbia AMT-Free Intermediate Muni Bond Fund – Class W: CAFTX

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia AMT-Free Intermediate Muni Bond Fund $333 $ 525 $ 734 $1,334

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Alternative Beta Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Alternative Beta Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Alternative Beta Fund $387 $ 688 $1,058 $2,096

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Balanced Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Balanced Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.
Effective immediately, the information on the cover of the Prospectus and Summary Prospectus for Columbia AMT-Free Intermediate Muni Bond Fund and Columbia Balanced Fund is hereby revised to reflect that, effective on or about April 3, 2017, Class T shares (formerly Class W) will commence operations under the following ticker symbols:  
  Columbia Balanced Fund – Class W: CBDTX

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Balanced Fund $349 $ 560 $ 789 $1,444

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Bond Fund 9/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Bond Fund $336 $ 549 $ 780 $1,442

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Bond Fund 09/27/2010 -2.62% 2.31% 3.75% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Contrarian Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Contrarian Core Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Contrarian Core Fund $355 $ 579 $ 820 $1,512

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Contrarian Core Fund 09/27/2010 0.26% 12.32% 8.91% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Corporate Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Corporate Income Fund 9/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Corporate Income Fund $342 $ 549 $ 772 $1,416

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Corporate Income Fund 09/27/2010 -5.98% 3.39% 4.50% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Disciplined Small Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Disciplined Small Core Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Disciplined Small Core Fund $388 $ 683 $1,000 $1,897

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Disciplined Small Core Fund 09/27/2010 -9.91% 5.94% 5.80% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Diversified Absolute Return Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Diversified Absolute Return Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Diversified Absolute Return Fund $465 $1,076 $1,713 $3,419

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Diversified Real Return Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Diversified Real Return Fund 6/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Diversified Real Return Fund $370 $ 927 $1,510 $3,090

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Diversified Real Return Fund 06/25/2014 -8.31% NA NA -6.38%

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Dividend Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Dividend Income Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Dividend Income Fund $351 $ 567 $ 799 $1,467

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Dividend Income Fund 09/27/2010 -2.18% 10.81% 7.46% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Emerging Markets Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Emerging Markets Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Emerging Markets Fund $410 $ 762 $1,138 $2,191

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Emerging Markets Fund 09/27/2010 -11.67% -3.34% 2.98% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Global Dividend Opportunity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Global Dividend Opportunity Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Global Dividend Opportunity Fund $384 $ 704 $1,047 $2,013

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Global Dividend Opportunity Fund 09/27/2010 -9.10% 3.04% 3.61% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Global Energy and Natural Resources Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Global Energy and Natural Resources Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Global Energy and Natural Resources Fund $384 $ 667 $ 971 $1,833

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Global Technology Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Global Technology Growth Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Global Technology Growth Fund $383 $ 664 $ 966 $1,822

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Greater China Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Greater China Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Greater China Fund $411 $ 748 $1,109 $2,124

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Greater China Fund 06/18/2012 -3.09% 1.43% 10.10% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Large Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Large Cap Growth Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Large Cap Growth Fund $359 $ 591 $ 841 $1,557

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Large Cap Growth Fund 09/27/2010 6.09% 12.89% 8.05% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Mid Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Mid Cap Growth Fund 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Mid Cap Growth Fund $369 $ 621 $ 893 $1,668

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Mid Cap Growth Fund 09/27/2010 2.35% 8.63% 7.72% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Multi-Asset Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Multi-Asset Income Fund 9/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Multi-Asset Income Fund $348 $ 622 $ 916 $1,752

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Pacific/Asia Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Pacific/Asia Fund 8/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Pacific/Asia Fund $399 $ 712 $1,048 $1,996

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Pacific/Asia Fund 06/18/2012 0.54% 2.44% 3.24% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Real Estate Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Real Estate Equity Fund 5/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Real Estate Equity Fund $373 $ 634 $ 914 $1,712

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Real Estate Equity Fund 09/27/2010 1.70% 10.27% 6.49% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Select Large Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Select Large Cap Growth Fund 8/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Select Large Cap Growth Fund $356 $ 582 $ 825 $1,523

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Select Large Cap Growth Fund 09/27/2010 4.90% 12.65% 9.01% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Small Cap Growth Fund I  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Small Cap Growth Fund I 1/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Small Cap Growth Fund I $384 $ 679 $ 996 $1,894

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Strategic Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Strategic Income Fund 3/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Strategic Income Fund $350 $ 564 $ 794 $1,455

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.
For the periods ended December 31, 2016
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years
Columbia Strategic Income Fund 09/27/2010 5.34% 4.08% 5.28%

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia Total Return Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia Total Return Bond Fund 9/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Total Return Bond Fund $336 $ 526 $ 732 $1,327

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Total Return Bond Fund 09/27/2010 -2.44% 2.69% 4.12% NA

The rest of the section remains the same.
COLUMBIA FUNDS SERIES TRUST I | Columbia U.S. Treasury Index Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust I  
 Columbia U.S. Treasury Index Fund 9/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia U.S. Treasury Index Fund $295 $ 435 $ 588 $1,033

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia U.S. Treasury Index Fund 06/18/2012 -2.24% 1.79% 3.30% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Absolute Return Currency and Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Absolute Return Currency and Income Fund 3/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Absolute Return Currency and Income Fund $415 $ 760 $1,130 $2,166

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.
For the periods ended December 31, 2016
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years
Columbia Absolute Return Currency and Income Fund 12/01/2006 -0.60% 3.75% 2.74%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Commodity Strategy Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
  Columbia Commodity Strategy Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Commodity Strategy Fund $393 $ 702 $1,034 $1,971

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Commodity Strategy Fund 07/28/2011        
   returns before taxes   -25.90% NA NA -15.30%
   returns after taxes on distributions   -25.90% NA NA -15.30%
   returns after taxes on distributions
   and sale of Fund shares
  -14.66% NA NA -10.78%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Disciplined Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Disciplined Core Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Disciplined Core Fund $353 $ 573 $ 810 $1,489

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Disciplined Core Fund 12/01/2006 -1.66% 12.95% 6.78% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Disciplined Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Disciplined Growth Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Disciplined Growth Fund $369 $ 636 $ 923 $1,740

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Disciplined Growth Fund 08/01/2008 4.21% 13.47% NA 6.78%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Disciplined Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
  Columbia Disciplined Value Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Disciplined Value Fund $364 $ 617 $ 888 $1,664

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Disciplined Value Fund 08/01/2008 -6.43% 11.41% NA 6.61%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Diversified Equity Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
  Columbia Diversified Equity Income Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Diversified Equity Income Fund $353 $ 573 $ 810 $1,489

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Diversified Equity Income Fund 12/01/2006 -4.81% 8.60% 5.55% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Dividend Opportunity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
  Columbia Dividend Opportunity Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Dividend Opportunity Fund $350 $ 564 $ 794 $1,455

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Dividend Opportunity Fund 12/01/2006 -5.04% 9.55% 7.02% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Emerging Markets Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
  Columbia Emerging Markets Bond Fund 3/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Emerging Markets Bond Fund $367 $ 620 $ 891 $1,666

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.
For the periods ended December 31, 2016
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years
Columbia Emerging Markets Bond Fund 12/01/2006 9.34% 4.06% 6.05%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia European Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
  Columbia European Equity Fund 3/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia European Equity Fund $384 $ 667 $ 971 $1,833

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.
For the periods ended December 31, 2016
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years
Columbia European Equity Fund 06/18/2012 -9.10% 5.68% 2.41%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Flexible Capital Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Flexible Capital Income Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
   Columbia Flexible Capital Income Fund $367 $ 615 $ 883 $1,646

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Flexible Capital Income Fund 07/28/2011 -8.73% NA NA 5.88%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Floating Rate Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Floating Rate Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Floating Rate Fund $353 $ 577 $ 818 $1,510

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Floating Rate Fund 12/01/2006 -2.81% 2.90% NA 3.18%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Global Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Global Bond Fund 3/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Global Bond Fund $353 $ 654 $ 976 $1,888

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.
For the periods ended December 31, 2016
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years
Columbia Global Bond Fund 12/01/2006 -3.86% -2.53% 1.53%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Global Equity Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Global Equity Value Fund 7/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Global Equity Value Fund $367 $ 615 $ 883 $1,646

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Global Equity Value Fund 12/01/2006 -8.26% 6.73% 4.67% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Global Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Global Opportunities Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Global Opportunities Fund $370 $ 624 $ 898 $1,679

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Global Opportunities Fund 06/25/2014 -3.25% 4.67% 3.63% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Government Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Government Money Market Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Government Money Market Fund $312 $ 475 $ 653 $1,167

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Government Money Market Fund 12/01/2006 -2.90% -0.58% 0.85% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia High Yield Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia High Yield Bond Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia High Yield Bond Fund $355 $ 579 $ 820 $1,512

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia High Yield Bond Fund 12/01/2006 -3.55% 5.08% 6.32% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Income Builder Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Income Builder Fund 6/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Income Builder Fund $351 $ 567 $ 799 $1,467

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Income Builder Fund 06/25/2014 -4.01% 4.46% NA 4.92%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Income Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Income Opportunities Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Income Opportunities Fund $356 $ 594 $ 851 $1,585

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Income Opportunities Fund 09/27/2010 -3.59% 4.84% 6.07% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Inflation Protected Securities Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Inflation Protected Securities Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Inflation Protected Securities Fund $330 $ 547 $ 783 $1,458

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Inflation Protected Securities Fund 12/01/2006 -8.42% 0.58% 2.48% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Limited Duration Credit Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Limited Duration Credit Fund 12/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Limited Duration Credit Fund $330 $ 516 $ 718 $1,300

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Limited Duration Credit Fund 12/01/2006 -4.32% 1.05% 2.84% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Mortgage Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Mortgage Opportunities Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Mortgage Opportunities Fund $349 $ 592 $ 853 $1,600

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Mortgage Opportunities Fund 04/30/2014 -0.26% NA NA 1.18%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Select Global Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Select Global Equity Fund 3/1/2017
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Select Global Equity Fund $388 $ 679 $ 991 $1,877

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.
For the periods ended December 31, 2016
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years
Columbia Select Global Equity Fund 12/01/2006 -3.25% 7.83% 2.44%

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Select Large-Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Select Large-Cap Value Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Select Large-Cap Value Fund $364 $ 617 $ 888 $1,664

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Select Large-Cap Value Fund 09/27/2010 -8.20% 10.25% 6.21% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia Small/Mid Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia Small/Mid Cap Value Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia Small/Mid Cap Value Fund $374 $ 637 $ 919 $1,724

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia Small/Mid Cap Value Fund 12/01/2006 -8.71% 7.29% 5.77% NA

The rest of the section remains the same.
Columbia Funds Series Trust II | Columbia U.S. Government Mortgage Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] cfsti2_SupplementTextBlock
Supplement dated March 10, 2017

to the Prospectus and Summary Prospectus (each as supplemented, if applicable) of each of the following Funds
(each a Fund and together the Funds):
Fund Prospectuses Dated
Columbia Funds Series Trust II  
 Columbia U.S. Government Mortgage Fund 10/1/2016
Effective on or about March 27, 2017 (the Effective Date), the shares held by Class I shareholders are exchanged for Class Y shares of the same Fund in a tax-free transaction with no impact on the fees and expenses paid by shareholders and Class I shares of the Funds are no longer offered for sale. Also, as of the Effective Date, Class W shares are renamed and re-designated as Class T shares. Therefore, as of the Effective Date, all references to Class I shares in each Fund's Prospectus and Summary Prospectus are hereby deleted and all information regarding Class W shares in each Fund's Prospectus and Summary Prospectus is hereby deleted and replaced with the information in this Supplement for Class T shares.

Effective April 10, 2017, the information beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to insert the following information:

An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the broker/financial intermediary for effecting such transactions. Such commissions are not reflected in the tables or the example below.

As of the Effective Date, the "Shareholder Fees" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the information for Class W and insert the following:

Shareholder Fees (fees paid directly from your investment)
        Class T
Maximum sales charge (load) imposed on purchases (as a % of offering price)       2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)       None

As of the Effective Date, the "Example" table beneath the caption "Fees and Expenses of the Fund" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row for “Class W (whether or not shares are redeemed)” and insert a new row for “Class T (whether or not shares are redeemed)” for each Fund, respectively, as shown below.
Class T (whether or not shares are redeemed) 1 year 3 years 5 years 10 years
    Columbia U.S. Government Mortgage Fund $340 $ 544 $ 766 $1,404

The rest of the section remains the same.

As of the Effective Date, the information in the "Average Annual Total Returns After Applicable Sales Charges" table under the caption "Performance Information" in each Fund's Summary Prospectus and in the "Summary of the Fund" section of each Fund's Prospectus is hereby revised to delete the row(s) for Class W returns and add the information shown in the table below for Class T returns, respectively,  for each Fund. Additionally, the narrative beneath the caption "Performance Information" is revised to add the following information:

Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%.

For the periods ended December 31, 2015:
For the periods ended December 31, 2015
Class T returns before taxes (unless noted otherwise)
Share Class Inception Date 1 year 5 years 10 years Life of Fund
Columbia U.S. Government Mortgage Fund 06/18/2012 -1.43% 3.59% 4.58% NA

The rest of the section remains the same.