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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Mar. 31, 2011
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 Feb. 02, 2012
Document Effective Date dei_DocumentEffectiveDate Feb. 02, 2012
Prospectus Date rr_ProspectusDate Feb. 02, 2012
(Columbia Value and Restructuring Fund)
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] columbia_SupplementTextBlock
COLUMBIA FUNDS SERIES TRUST I

Columbia Value and Restructuring Fund
(the "Fund")

Supplement dated February 2, 2012 to the Prospectuses
dated August 1, 2011, as supplemented

Effective February 2, 2012, the fourth paragraph under the section of each prospectus for the Fund entitled "Principal Investment Strategies" is modified by adding the following factors:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

  • the financial condition and management of a company, including its competitive position, the quality of its balance sheet and earnings, its future prospects, and the potential for growth and stock price appreciation.

  • overall economic and market conditions.