Shareholder Fees (dei_DocumentInformationDocumentAxis)	0 Months Ended
	Dec. 01, 2012
(CMG Ultra Short Term Bond Fund) | CMG Ultra Short Term Bond Fund
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value
(Columbia Tax-Exempt Fund) | Class A Shares
Shareholder Fees:
Maximum sales charge (load) imposed on purchases, as a % of offering price	4.75%
Maximum deferred sales charge (load) imposed on redemptions, as a % of the lower of the original purchase price or current net asset value	1.00%	[1]
(Columbia Tax-Exempt Fund) | Class B 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 current net asset value	5.00%	[2]
(Columbia Tax-Exempt Fund) | Class C 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 current net asset value	1.00%	[3]
(Columbia Tax-Exempt Fund) | Class Z 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 current net asset value	none

[1] Contingent deferred sales charges (CDSC) on certain investments of between $1 million and $50 million redeemed within 18 months of purchase, charged as follows: 1.00% CDSC if redeemed within 12 months of purchase, and 0.50% CDSC if redeemed more than 12, but less than 18, months of purchase, with certain limited exceptions.

[2] This charge decreases over time.

[3] This charge applies to investors who buy Class C shares and redeem them within one year of purchase, with certain limited exceptions.