Shareholder Report, Holdings (Details)	May 31, 2025
Columbia Mortgage Opportunities Fund - Class A \| Long Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Mortgage Opportunities Fund - Class A \| Long Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	110.70%
Columbia Mortgage Opportunities Fund - Class A \| Short Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Columbia Mortgage Opportunities Fund - Class A \| Short Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	283.60%
Columbia Mortgage Opportunities Fund - Class A \| AAA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Mortgage Opportunities Fund - Class A \| AA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	140.90%
Columbia Mortgage Opportunities Fund - Class A \| A Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Mortgage Opportunities Fund - Class A \| BBB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
Columbia Mortgage Opportunities Fund - Class A \| BB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.40%
Columbia Mortgage Opportunities Fund - Class A \| B Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Mortgage Opportunities Fund - Class A \| CCC Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mortgage Opportunities Fund - Class A \| Not Rated [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Columbia Mortgage Opportunities Fund - Class A \| Residential Mortgage Backed Securities Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	137.10%
Columbia Mortgage Opportunities Fund - Class A \| Residential Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	47.20%
Columbia Mortgage Opportunities Fund - Class A \| Asset Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Columbia Mortgage Opportunities Fund - Class A \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Mortgage Opportunities Fund - Class A \| Commercial Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Mortgage Opportunities Fund - Class A \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Mortgage Opportunities Fund - Class C \| Long Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Mortgage Opportunities Fund - Class C \| Long Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	110.70%
Columbia Mortgage Opportunities Fund - Class C \| Short Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Columbia Mortgage Opportunities Fund - Class C \| Short Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	283.60%
Columbia Mortgage Opportunities Fund - Class C \| AAA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Mortgage Opportunities Fund - Class C \| AA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	140.90%
Columbia Mortgage Opportunities Fund - Class C \| A Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Mortgage Opportunities Fund - Class C \| BBB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
Columbia Mortgage Opportunities Fund - Class C \| BB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.40%
Columbia Mortgage Opportunities Fund - Class C \| B Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Mortgage Opportunities Fund - Class C \| CCC Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mortgage Opportunities Fund - Class C \| Not Rated [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Columbia Mortgage Opportunities Fund - Class C \| Residential Mortgage Backed Securities Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	137.10%
Columbia Mortgage Opportunities Fund - Class C \| Residential Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	47.20%
Columbia Mortgage Opportunities Fund - Class C \| Asset Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Columbia Mortgage Opportunities Fund - Class C \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Mortgage Opportunities Fund - Class C \| Commercial Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Mortgage Opportunities Fund - Class C \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Mortgage Opportunities Fund - Institutional Class \| Long Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Mortgage Opportunities Fund - Institutional Class \| Long Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	110.70%
Columbia Mortgage Opportunities Fund - Institutional Class \| Short Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Columbia Mortgage Opportunities Fund - Institutional Class \| Short Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	283.60%
Columbia Mortgage Opportunities Fund - Institutional Class \| AAA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Mortgage Opportunities Fund - Institutional Class \| AA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	140.90%
Columbia Mortgage Opportunities Fund - Institutional Class \| A Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Mortgage Opportunities Fund - Institutional Class \| BBB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
Columbia Mortgage Opportunities Fund - Institutional Class \| BB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.40%
Columbia Mortgage Opportunities Fund - Institutional Class \| B Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Mortgage Opportunities Fund - Institutional Class \| CCC Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mortgage Opportunities Fund - Institutional Class \| Not Rated [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Columbia Mortgage Opportunities Fund - Institutional Class \| Residential Mortgage Backed Securities Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	137.10%
Columbia Mortgage Opportunities Fund - Institutional Class \| Residential Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	47.20%
Columbia Mortgage Opportunities Fund - Institutional Class \| Asset Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Columbia Mortgage Opportunities Fund - Institutional Class \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Mortgage Opportunities Fund - Institutional Class \| Commercial Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Mortgage Opportunities Fund - Institutional Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Long Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Long Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	110.70%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Short Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Short Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	283.60%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| AAA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| AA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	140.90%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| A Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| BBB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| BB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.40%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| B Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| CCC Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Not Rated [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Residential Mortgage Backed Securities Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	137.10%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Residential Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	47.20%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Asset Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Commercial Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Mortgage Opportunities Fund - Institutional 2 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Long Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Long Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	110.70%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Short Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Short Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	283.60%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| AAA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| AA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	140.90%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| A Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| BBB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| BB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.40%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| B Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| CCC Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Not Rated [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Residential Mortgage Backed Securities Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	137.10%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Residential Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	47.20%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Asset Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Commercial Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Mortgage Opportunities Fund - Institutional 3 Class \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Columbia Mortgage Opportunities Fund - Class S \| Long Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.20%
Columbia Mortgage Opportunities Fund - Class S \| Long Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	110.70%
Columbia Mortgage Opportunities Fund - Class S \| Short Credit Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Columbia Mortgage Opportunities Fund - Class S \| Short Interest Rate Risk [Member]
Holdings [Line Items]
Percent of Net Asset Value	283.60%
Columbia Mortgage Opportunities Fund - Class S \| AAA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%
Columbia Mortgage Opportunities Fund - Class S \| AA Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	140.90%
Columbia Mortgage Opportunities Fund - Class S \| A Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.20%
Columbia Mortgage Opportunities Fund - Class S \| BBB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.20%
Columbia Mortgage Opportunities Fund - Class S \| BB Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.40%
Columbia Mortgage Opportunities Fund - Class S \| B Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.70%
Columbia Mortgage Opportunities Fund - Class S \| CCC Rating [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Columbia Mortgage Opportunities Fund - Class S \| Not Rated [Member]
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Columbia Mortgage Opportunities Fund - Class S \| Residential Mortgage Backed Securities Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	137.10%
Columbia Mortgage Opportunities Fund - Class S \| Residential Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	47.20%
Columbia Mortgage Opportunities Fund - Class S \| Asset Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.30%
Columbia Mortgage Opportunities Fund - Class S \| Money Market Fund [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.50%
Columbia Mortgage Opportunities Fund - Class S \| Commercial Mortgage Backed Securities Non Agency [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Columbia Mortgage Opportunities Fund - Class S \| Other [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.30%

Shareholder Report, Holdings (Details)

May 31, 2025