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  <cfst33:SupplementTextBlock contextRef="Duration_02Apr2011_01Apr2012">&lt;table cellspacing="0" cellpadding="0" width="100%" border="0" align="center" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr bgcolor="#000000"&gt;&lt;td valign="bottom" align="center" bgcolor="#000000"&gt;&lt;p align="center" style="margin-top: 0px; margin-bottom: 0px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;&lt;font size="2" color="#ffffff"&gt;Prospectus Supplement &amp;#150; October&amp;nbsp;17, 2012&lt;/font&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;p align="center" style="margin-top: 0px; margin-bottom: 1px; "&gt;&lt;font size="2" color="#ffffff" style="font-family: ARIAL; "&gt;&lt;/font&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;&lt;font size="2" color="#ffffff"&gt;&lt;/font&gt;&lt;/b&gt;&lt;font size="2" color="#ffffff"&gt;&lt;i&gt;to the Prospectus of Columbia Mid Cap Growth Opportunity Fund, as supplemented&lt;/i&gt;&lt;/font&gt;&lt;font size="2" color="#ffffff"&gt;&lt;b&gt;&lt;/b&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;p style="font-family: 'Times New Roman'; font-size: medium; background-color: rgb(255, 255, 255); margin-top: 6px; margin-bottom: 0px; "&gt;&lt;font size="2"&gt;&lt;i&gt;Effective October&amp;nbsp;31, 2012, information with respect to Class R3 shares (effective October&amp;nbsp;31, 2012, known as Class R4 shares) found in the Annual Fund Operating Expenses table and Example in the Fees and Expenses of the Fund section in the Summary of the Fund is hereby replaced, as follows:&lt;/i&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style="font-family: 'Times New Roman'; background-color: rgb(255, 255, 255); font-size: 6px; margin-top: 0px; margin-bottom: 0px; "&gt;&amp;nbsp;&lt;/p&gt;&lt;table cellspacing="0" cellpadding="0" width="100%" border="0" align="center" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="92%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="6%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;p style="margin-top: 0px; margin-bottom: 0px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;/font&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;&lt;font size="2"&gt;Annual Fund Operating Expenses&lt;/font&gt;&lt;font size="1"&gt;&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(a)&lt;/sup&gt;&lt;/font&gt;&lt;font size="2"&gt;&lt;/font&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style="margin-top: 0px; margin-bottom: 1px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;/font&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;(expenses that you pay each year as a percentage of the value of your investment)&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td colspan="2" valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td height="5"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;Class R4&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Management Fee&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.74&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Distribution and/or service (12b-1) fees&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.00&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Other expenses&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.40&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Total annual fund operating expenses&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;1.14&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Less: Fee waiver/expense reimbursement&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(b)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.04&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Total annual fund operating expenses after fee waiver/expense reimbursement&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(b)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;1.10&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;p style="font-family: 'Times New Roman'; background-color: rgb(255, 255, 255); font-size: 4px; margin-top: 0px; margin-bottom: 0px; "&gt;&amp;nbsp;&lt;/p&gt;&lt;table border="0" cellpadding="0" cellspacing="0" width="100%" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="1%" valign="top" align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(a)&lt;/sup&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td align="left" valign="top"&gt;&lt;p align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Expense ratios have been adjusted to reflect current fees.&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table border="0" cellpadding="0" cellspacing="0" width="100%" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="1%" valign="top" align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(b)&lt;/sup&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td align="left" valign="top"&gt;&lt;p align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until March&amp;nbsp;31, 2014, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, through March&amp;nbsp;31, 2013 the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rate of 1.05% for Class R4.&amp;nbsp;Beginning April&amp;nbsp;1, 2013 through March&amp;nbsp;31, 2014, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rate of 1.10% for Class R4. This net operating expense ratio is shown in the table.&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;p style="font-family: 'Times New Roman'; font-size: medium; background-color: rgb(255, 255, 255); margin-top: 8px; margin-bottom: 0px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;Example&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;table cellspacing="0" cellpadding="0" width="100%" border="0" align="center" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="75%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td height="5"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;Class&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;1&amp;nbsp;year&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;3&amp;nbsp;years&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;5&amp;nbsp;years&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;10&amp;nbsp;years&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Class R4&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;112&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;359&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;625&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;1,387&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</cfst33:SupplementTextBlock>
  <rr:ManagementFeesOverAssets id="Item_3" decimals="4" contextRef="Duration_02Apr2011_01Apr2012S000031377_MemberC000097611_Member" unitRef="pure">0.0074</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets id="Item_4" decimals="4" contextRef="Duration_02Apr2011_01Apr2012S000031377_MemberC000097611_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets id="Item_5" decimals="4" contextRef="Duration_02Apr2011_01Apr2012S000031377_MemberC000097611_Member" unitRef="pure">0.004</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets id="Item_6" decimals="4" contextRef="Duration_02Apr2011_01Apr2012S000031377_MemberC000097611_Member" unitRef="pure">0.0114</rr:ExpensesOverAssets>
  <rr:NetExpensesOverAssets id="Item_7" decimals="4" contextRef="Duration_02Apr2011_01Apr2012S000031377_MemberC000097611_Member" unitRef="pure">0.011</rr:NetExpensesOverAssets>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_02Apr2011_01Apr2012S000031377_MemberC000097611_Member" unitRef="USD">1387</rr:ExpenseExampleYear10>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_02Apr2011_01Apr2012S000031377_Member">&lt;font size="1" style="font-family: ARIAL; "&gt;March 31, 2014&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <cfst33:SupplementTextBlock contextRef="Duration_02Apr2011_01Apr2012S000031377_Member">&lt;table cellspacing="0" cellpadding="0" width="100%" border="0" align="center" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr bgcolor="#000000"&gt;&lt;td valign="bottom" align="center" bgcolor="#000000"&gt;&lt;p align="center" style="margin-top: 0px; margin-bottom: 0px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;&lt;font size="2" color="#ffffff"&gt;Prospectus Supplement &amp;#150; October&amp;nbsp;17, 2012&lt;/font&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;p align="center" style="margin-top: 0px; margin-bottom: 1px; "&gt;&lt;font size="2" color="#ffffff" style="font-family: ARIAL; "&gt;&lt;/font&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;&lt;font size="2" color="#ffffff"&gt;&lt;/font&gt;&lt;/b&gt;&lt;font size="2" color="#ffffff"&gt;&lt;i&gt;to the Prospectus of Columbia Mid Cap Growth Opportunity Fund, as supplemented&lt;/i&gt;&lt;/font&gt;&lt;font size="2" color="#ffffff"&gt;&lt;b&gt;&lt;/b&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;p style="font-family: 'Times New Roman'; font-size: medium; background-color: rgb(255, 255, 255); margin-top: 6px; margin-bottom: 0px; "&gt;&lt;font size="2"&gt;&lt;i&gt;Effective October&amp;nbsp;31, 2012, information with respect to Class R3 shares (effective October&amp;nbsp;31, 2012, known as Class R4 shares) found in the Annual Fund Operating Expenses table and Example in the Fees and Expenses of the Fund section in the Summary of the Fund is hereby replaced, as follows:&lt;/i&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style="font-family: 'Times New Roman'; background-color: rgb(255, 255, 255); font-size: 6px; margin-top: 0px; margin-bottom: 0px; "&gt;&amp;nbsp;&lt;/p&gt;&lt;table cellspacing="0" cellpadding="0" width="100%" border="0" align="center" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="92%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="6%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;p style="margin-top: 0px; margin-bottom: 0px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;/font&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;&lt;font size="2"&gt;Annual Fund Operating Expenses&lt;/font&gt;&lt;font size="1"&gt;&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(a)&lt;/sup&gt;&lt;/font&gt;&lt;font size="2"&gt;&lt;/font&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style="margin-top: 0px; margin-bottom: 1px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;/font&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;(expenses that you pay each year as a percentage of the value of your investment)&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td colspan="2" valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td height="5"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;Class R4&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Management Fee&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.74&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Distribution and/or service (12b-1) fees&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.00&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Other expenses&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.40&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Total annual fund operating expenses&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;1.14&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Less: Fee waiver/expense reimbursement&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(b)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;0.04&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="top"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Total annual fund operating expenses after fee waiver/expense reimbursement&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(b)&lt;/sup&gt;&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;1.10&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;%&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;p style="font-family: 'Times New Roman'; background-color: rgb(255, 255, 255); font-size: 4px; margin-top: 0px; margin-bottom: 0px; "&gt;&amp;nbsp;&lt;/p&gt;&lt;table border="0" cellpadding="0" cellspacing="0" width="100%" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="1%" valign="top" align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(a)&lt;/sup&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td align="left" valign="top"&gt;&lt;p align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Expense ratios have been adjusted to reflect current fees.&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table border="0" cellpadding="0" cellspacing="0" width="100%" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="1%" valign="top" align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;sup style="vertical-align: baseline; position: relative; bottom: 0.8ex; "&gt;(b)&lt;/sup&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td align="left" valign="top"&gt;&lt;p align="left"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until March&amp;nbsp;31, 2014, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, through March&amp;nbsp;31, 2013 the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rate of 1.05% for Class R4.&amp;nbsp;Beginning April&amp;nbsp;1, 2013 through March&amp;nbsp;31, 2014, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rate of 1.10% for Class R4. This net operating expense ratio is shown in the table.&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;p style="font-family: 'Times New Roman'; font-size: medium; background-color: rgb(255, 255, 255); margin-top: 8px; margin-bottom: 0px; "&gt;&lt;font size="2" style="font-family: ARIAL; "&gt;&lt;b&gt;Example&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;&lt;table cellspacing="0" cellpadding="0" width="100%" border="0" align="center" style="background-color: rgb(255, 255, 255); border-collapse: collapse; "&gt;&lt;tr&gt;&lt;td width="75%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td&gt;&lt;/td&gt;&lt;td valign="bottom" width="2%"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td height="5"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;td height="5" colspan="4"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td valign="bottom"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;Class&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;1&amp;nbsp;year&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;3&amp;nbsp;years&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;5&amp;nbsp;years&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom" colspan="2" align="center"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&lt;b&gt;10&amp;nbsp;years&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr bgcolor="#cceeff"&gt;&lt;td valign="top"&gt;&lt;p style="margin-left: 1em; text-indent: -1em; "&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;Class R4&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;112&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;359&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;625&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td valign="bottom"&gt;&lt;font size="1"&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" align="right"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;1,387&lt;/font&gt;&lt;/td&gt;&lt;td nowrap="nowrap" valign="top"&gt;&lt;font size="1" style="font-family: ARIAL; "&gt;&amp;nbsp;&amp;nbsp;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</cfst33:SupplementTextBlock>
  <rr:ProspectusDate contextRef="Duration_02Apr2011_01Apr2012">2012-04-01</rr:ProspectusDate>
  <dei:DocumentEffectiveDate contextRef="Duration_02Apr2011_01Apr2012">2012-10-18</dei:DocumentEffectiveDate>
  <rr:ExpenseExampleNoRedemptionYear03 decimals="INF" contextRef="Duration_02Apr2011_01Apr2012S000031377_MemberC000097611_Member" unitRef="USD">359</rr:ExpenseExampleNoRedemptionYear03>
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    <link:loc xlink:type="locator" xlink:href="#Item_2" xlink:label="FeeWaiverOrReimbursementOverAssets" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets">Expense ratios have been adjusted to reflect current fees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets_2">Columbia Management Investment Advisers, LLC and certain of its affiliates have contractually agreed to waive fees and/or to reimburse expenses (excluding certain fees and expenses, such as transaction costs and certain other investment related expenses, interest, taxes, acquired fund fees and expenses, and extraordinary expenses) until March 31, 2014, unless sooner terminated at the sole discretion of the Fund's Board of Trustees. Under this agreement, through March 31, 2013 the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rate of 1.05% for Class R4. Beginning April 1, 2013 through March 31, 2014, the Fund's net operating expenses will not, subject to applicable exclusions, exceed the annual rate of 1.10% for Class R4. This net operating expense ratio is shown in the table.</link:footnote>
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  </link:footnoteLink>
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