0001097519 2012-11-01 2012-11-01 0001097519 columbia:S000010792Member columbia:AAAAMember 2012-11-01 2012-11-01 0001097519 columbia:S000010792Member columbia:C000079026Member columbia:AAAAMember 2012-11-01 2012-11-01 xbrli:pure iso4217:USD xbrli:shares iso4217:USD xbrli:shares Other 2012-02-29 COLUMBIA FUNDS SERIES TRUST 0001097519 false 2012-11-01 2012-11-01 2012-11-01 <div style="display: none">~ http://xbrl.sec.gov/rr/role/RiskReturnDetailData column period compact * row dei_DocumentInformationDocumentAxis compact * row dei_LegalEntityAxis compact * row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * row primary compact * ~</div> <p style="font-size:12;padding-top:2;padding-bottom:0;padding-left:0;"><b>Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)</b></p> <p style="font-size:12;padding-top:2;padding-bottom:0;padding-left:0;"> The Fund's prospectus offering Class Y shares is revised and supplemented as follows:</p> <div style="display:none">~http://columbia/role/ShareholderFeesDataAAAA column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact columbia_S000010792Member ~</div> <div style="display:none">~ http://columbia/role/OperatingExpensesDataAAAA column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact columbia_S000010792Member ~</div> 0.0070 0.0073 <div style="display:none">~ http://columbia/role/ExpenseExampleAAAA column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact columbia_S000010792Member ~</div> <div style="display:none">~ http://columbia/role/ExpenseExampleNoRedemptionAAAA column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact columbia_S000010792Member ~</div> 75 233 406 906 <p></p> <div style="font-size:14;padding-top:5;padding-bottom:0;padding-left:0; text-align: center"><font size="2"><b>COLUMBIA FUNDS SERIES TRUST</b></font> </div><p></p> <div style="font-size:14;padding-top:5;padding-bottom:0;padding-left:0; text-align: center"> <font size="2"><b>Columbia Mid Cap Value Fund<br/>(the "Fund")</b></font></div><p></p> <div style="font-size:14;padding-top:5;padding-bottom:0;padding-left:0; text-align: center"><font size="2"><b>Supplement dated November 1, 2012 to<br/>the Fund's Class Y prospectus dated July 1, 2012, as supplemented </b></font></div><p></p> <p style="font-size:12;padding-top:2;padding-bottom:0;padding-left:0;">The section of the Fund's prospectus entitled <b><i>"Columbia Mid Cap Value Fund – Fees and Expenses of the Fund"</i></b> is modified by deleting the table entitled <b><i>"Annual Fund Operating Expenses"</i></b> and the expense example table in the subsection entitled <b><i>"Example"</i></b> and replacing them with the following:</p> 0.0000 0.0003 Management fees have been restated to reflect contractual changes to the investment advisory and/or administrative fee rates. Other expenses have been restated to reflect contractual changes to certain fees paid by the Fund.