Shareholder Fees (dei_DocumentInformationDocumentAxis)	0 Months Ended
	Nov. 08, 2012
(Columbia Acorn Emerging Markets Fund℠) | Class R4 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn Emerging Markets Fund℠) | Class R5 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn European Fund℠) | Class R5 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn® Fund) | Class R4 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn® Fund) | Class R5 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn® Fund) | Class Y Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn International®) | Class R4 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn International®) | Class Y Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn International Select℠) | Class R4 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn International Select℠) | Class R5 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn International Select℠) | Class Y Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn Select℠) | Class R4 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn Select℠) | Class R5 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn Select℠) | Class Y Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn USA®) | Class R4 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn USA®) | Class R5 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Acorn USA®) | Class Y Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Thermostat Fund℠) | Class R4 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Thermostat Fund℠) | Class R5 Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none
(Columbia Thermostat Fund℠) | Class Y Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	none
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or net asset value	none