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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Aug. 31, 2012
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 Jan. 04, 2013
Document Effective Date dei_DocumentEffectiveDate Jan. 04, 2013
Prospectus Date rr_ProspectusDate Jan. 04, 2013
Supplement Text Block columbia_SupplementTextBlock

COLUMBIA FUNDS SERIES TRUST I

COLUMBIA EMERGING MARKETS FUND
(the "Fund")

Supplement dated January 4, 2013 to the
Fund's prospectus dated January 1, 2013

(Columbia Emerging Markets Fund)
  
Risk/Return: rr_RiskReturnAbstract  
Bar Chart - Supplement Text columbia_SupplementTextBlock_01
Effective immediately, the following changes are hereby made to the prospectus for the Fund:

The bar chart under the section of the prospectus for the Fund entitled "Performance Information" is deleted in its entirety and replaced with the following disclosure:

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.
Bar Chart [Heading] rr_BarChartHeading

Year by Year Total Return (%) as of December 31 Each Year

[1]
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock

The bar chart shows how the Fund's Class Z share performance has varied for each full calendar year shown.

(Columbia Emerging Markets Fund) | Class Z shares
  
Risk/Return: rr_RiskReturnAbstract  
Annual Return 2002 rr_AnnualReturn2002 (5.38%)
Annual Return 2003 rr_AnnualReturn2003 63.90%
Annual Return 2004 rr_AnnualReturn2004 30.02%
Annual Return 2005 rr_AnnualReturn2005 29.09%
Annual Return 2006 rr_AnnualReturn2006 33.79%
Annual Return 2007 rr_AnnualReturn2007 26.95%
Annual Return 2008 rr_AnnualReturn2008 (55.37%)
Annual Return 2009 rr_AnnualReturn2009 76.88%
Annual Return 2010 rr_AnnualReturn2010 20.04%
Annual Return 2011 rr_AnnualReturn2011 (18.90%)
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date return as of September 30, 2012: 14.21%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 14.21%
[1] Year-to-date return as of September 30, 2012: 14.21%