Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

COLUMBIA FUNDS SERIES TRUST

Prospectus Date

rr_ProspectusDate

Jul. 01, 2017

Supplement [Text Block]

cfst_SupplementTextBlock

Supplement dated June 29, 2018

to the Prospectus and Summary Prospectus, each as supplemented, of the following fund (the Fund):

Fund	Prospectus and Summary Prospectus Dated
Columbia Funds Series Trust
Columbia Mid Cap Value Fund	7/1/2017

Effective July 1, 2018 (the Effective Date), the Fund’s name is changed to Columbia Select Mid Cap Value Fund. Accordingly, on such Effective Date, all references in the prospectus and summary prospectus to Columbia Mid Cap Value Fund are hereby deleted and replaced with Columbia Select Mid Cap Value Fund.

Columbia Mid Cap Value Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

cfst_SupplementTextBlock

Supplement dated June 29, 2018

to the Prospectus and Summary Prospectus, each as supplemented, of the following fund (the Fund):

Fund	Prospectus and Summary Prospectus Dated
Columbia Funds Series Trust
Columbia Mid Cap Value Fund	7/1/2017

Effective July 1, 2018 (the Effective Date), the Fund’s name is changed to Columbia Select Mid Cap Value Fund. Accordingly, on such Effective Date, all references in the prospectus and summary prospectus to Columbia Mid Cap Value Fund are hereby deleted and replaced with Columbia Select Mid Cap Value Fund.