The interactive data file included as an exhibit to this filing relates to the supplement to the prospectuses for Columbia AMT-Free California Intermediate Muni Bond Fund, Columbia AMT-Free Connecticut Intermediate Muni Bond Fund, Columbia AMT-Free Georgia Intermediate Muni Bond Fund, Columbia AMT-Free Maryland Intermediate Muni Bond Fund, Columbia AMT-Free Massachusetts Intermediate Muni Bond Fund, Columbia AMT-Free New York Intermediate Muni Bond Fund, Columbia AMT-Free North Carolina Intermediate Muni Bond Fund, Columbia AMT-Free Oregon Intermediate Muni Bond Fund, Columbia AMT-Free South Carolina Intermediate Muni Bond Fund, Columbia AMT-Free Virginia Intermediate Muni Bond Fund, Columbia Asia Pacific ex-Japan Fund, Columbia California Tax-Exempt Fund, Columbia Capital Allocation Aggressive Portfolio, Columbia Capital Allocation Conservative Portfolio, Columbia Capital Allocation Moderate Aggressive Portfolio, Columbia Capital Allocation Moderate Conservative Portfolio, Columbia Capital Allocation Moderate Portfolio, Columbia Global Infrastructure Fund, Columbia Global Strategic Equity Fund, Columbia High Yield Municipal Fund, Columbia Large Cap Enhanced Core Fund, Columbia Large Cap Growth Fund III, Columbia Large Cap Index Fund, Columbia Mid Cap Index Fund, Columbia Minnesota Tax-Exempt Fund, Columbia New York Tax-Exempt Fund, Columbia Select Global Growth Fund, Columbia Select Smaller-Cap Value Fund, Columbia Seligman Communications and Information Fund, Columbia Seligman Global Technology Fund, Columbia Short Term Municipal Bond Fund, Columbia Small Cap Value Fund I, Columbia Small Cap Value Fund II, Columbia Strategic Municipal Income Fund, Columbia Tax-Exempt Fund, and Columbia U.S. Social Bond Fund, filed pursuant to Rule 497(e) under the Securities Act of 1933, as amended, on March 10, 2017 (Accession No. 0001193125-17-078298), which is incorporated herein by reference.
| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Document Type | dei_DocumentType | Other |
| Document Period End Date | dei_DocumentPeriodEndDate | Mar. 10, 2017 |
| Registrant Name | dei_EntityRegistrantName | COLUMBIA FUNDS SERIES TRUST I |
| Central Index Key | dei_EntityCentralIndexKey | 0000773757 |
| Amendment Flag | dei_AmendmentFlag | false |
| Document Creation Date | dei_DocumentCreationDate | Mar. 10, 2017 |
| Document Effective Date | dei_DocumentEffectiveDate | Mar. 10, 2017 |
| Prospectus Date | rr_ProspectusDate | Mar. 10, 2017 |
Mar. 10, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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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):
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. The rest of the section remains the same. |
| Label | Element | Value | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Registrant Name | dei_EntityRegistrantName | COLUMBIA FUNDS SERIES TRUST I | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus Date | rr_ProspectusDate | Mar. 10, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia AMT-Free California Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia AMT-Free Georgia Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia AMT-Free Maryland Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia AMT-Free North Carolina Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia AMT-Free South Carolina Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia AMT-Free Virginia Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Capital Allocation Moderate Aggressive Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Capital Allocation Moderate Conservative Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Global Strategic Equity Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Large Cap Enhanced Core Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Large Cap Growth Fund III | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Large Cap Index Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Mid Cap Index Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Select Global Growth Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Short Term Municipal Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST | Columbia Small Cap Value Fund II | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia AMT-Free Connecticut Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia AMT-Free Massachusetts Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia AMT-Free New York Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia AMT-Free Oregon Intermediate Muni Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia California Tax-Exempt Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia High Yield Municipal Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia New York Tax-Exempt Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia Small Cap Value Fund I | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia Tax-Exempt Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| COLUMBIA FUNDS SERIES TRUST I | Columbia U.S. Social Bond Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Asia Pacific ex-Japan Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Capital Allocation Aggressive Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Capital Allocation Conservative Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Capital Allocation Moderate Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Global Infrastructure Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Minnesota Tax-Exempt Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Select Smaller-Cap Value Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Seligman Communications and Information Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Seligman Global Technology Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
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| Columbia Funds Series Trust II | Columbia Strategic Municipal Income Fund | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Supplement [Text Block] | cfsti1_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):
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. The rest of the section remains the same. |
| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Registrant Name | dei_EntityRegistrantName | COLUMBIA FUNDS SERIES TRUST I |
| Prospectus Date | rr_ProspectusDate | Mar. 10, 2017 |
| Document Creation Date | dei_DocumentCreationDate | Mar. 10, 2017 |
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