This semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 1-800-345-6611.

Additional Information Phone Number

1-800-345-6611

Additional Information Website

columbiathreadneedleus.com/resources/literature

Expenses [Text Block]

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class A	$66	1.22%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

Expenses Paid, Amount

$ 66

Expense Ratio, Percent

1.22%

^[1]

AssetsNet

$ 132,488,107

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Fund net assets	$132,488,107
Total number of portfolio holdings	78
Portfolio turnover for the reporting period	24%

Holdings [Text Block]

Real Estate Sub-industry Allocation

Table Summary
Health Care REITs	22.7%
Retail REITs	17.3%
Industrial REITs	13.4%
Data Center REITs	12.1%
Multi-Family Residential REITs	8.9%
Other Specialized REITs	5.8%
Self Storage REITs	4.9%
Single-Family Residential REITs	4.6%
Hotel & Resort REITs	4.1%
Office REITs	2.4%
Diversified REITs	2.0%
Other	0.7%

Asset Categories

Table Summary
Common Stocks		98.9%
Other		0.6%

Largest Holdings [Text Block]

Top Holdings

Table Summary
Welltower, Inc.	12.5%
Prologis, Inc.	10.0%
Equinix, Inc.	9.2%
Simon Property Group, Inc.	5.3%
Essex Property Trust, Inc.	3.5%
Ventas, Inc.	3.1%
Equity Residential	2.9%
Digital Realty Trust, Inc.	2.8%
Iron Mountain, Inc.	2.7%
Public Storage	2.7%

Material Fund Change [Text Block]

C000248364

Shareholder Report [Line Items]

Fund Name

Columbia Real Estate Equity Fund

Class Name

Class S

Trading Symbol

CREHX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 1-800-345-6611.

Additional Information Phone Number

1-800-345-6611

Additional Information Website

columbiathreadneedleus.com/resources/literature

Expenses [Text Block]

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class S	$52	0.97%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

0.97%

^[2]

AssetsNet

$ 132,488,107

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Fund net assets	$132,488,107
Total number of portfolio holdings	78
Portfolio turnover for the reporting period	24%

Holdings [Text Block]

Real Estate Sub-industry Allocation

Table Summary
Health Care REITs	22.7%
Retail REITs	17.3%
Industrial REITs	13.4%
Data Center REITs	12.1%
Multi-Family Residential REITs	8.9%
Other Specialized REITs	5.8%
Self Storage REITs	4.9%
Single-Family Residential REITs	4.6%
Hotel & Resort REITs	4.1%
Office REITs	2.4%
Diversified REITs	2.0%
Other	0.7%

Asset Categories

Table Summary
Common Stocks		98.9%
Other		0.6%

Largest Holdings [Text Block]

Top Holdings

Table Summary
Welltower, Inc.	12.5%
Prologis, Inc.	10.0%
Equinix, Inc.	9.2%
Simon Property Group, Inc.	5.3%
Essex Property Trust, Inc.	3.5%
Ventas, Inc.	3.1%
Equity Residential	2.9%
Digital Realty Trust, Inc.	2.8%
Iron Mountain, Inc.	2.7%
Public Storage	2.7%

Material Fund Change [Text Block]

C000094674

Shareholder Report [Line Items]

Fund Name

Columbia Real Estate Equity Fund

Class Name

Institutional 2 Class

Trading Symbol

CRRVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 1-800-345-6611.

Additional Information Phone Number

1-800-345-6611

Additional Information Website

columbiathreadneedleus.com/resources/literature

Expenses [Text Block]

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 2 Class	$47	0.88%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.88%

^[3]

AssetsNet

$ 132,488,107

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Fund net assets	$132,488,107
Total number of portfolio holdings	78
Portfolio turnover for the reporting period	24%

Holdings [Text Block]

Real Estate Sub-industry Allocation

Table Summary
Health Care REITs	22.7%
Retail REITs	17.3%
Industrial REITs	13.4%
Data Center REITs	12.1%
Multi-Family Residential REITs	8.9%
Other Specialized REITs	5.8%
Self Storage REITs	4.9%
Single-Family Residential REITs	4.6%
Hotel & Resort REITs	4.1%
Office REITs	2.4%
Diversified REITs	2.0%
Other	0.7%

Asset Categories

Table Summary
Common Stocks		98.9%
Other		0.6%

Largest Holdings [Text Block]

Top Holdings

Table Summary
Welltower, Inc.	12.5%
Prologis, Inc.	10.0%
Equinix, Inc.	9.2%
Simon Property Group, Inc.	5.3%
Essex Property Trust, Inc.	3.5%
Ventas, Inc.	3.1%
Equity Residential	2.9%
Digital Realty Trust, Inc.	2.8%
Iron Mountain, Inc.	2.7%
Public Storage	2.7%

Material Fund Change [Text Block]

C000171305

Shareholder Report [Line Items]

Fund Name

Columbia Real Estate Equity Fund

Class Name

Institutional 3 Class

Trading Symbol

CREYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 1-800-345-6611.

Additional Information Phone Number

1-800-345-6611

Additional Information Website

columbiathreadneedleus.com/resources/literature

Expenses [Text Block]

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional 3 Class	$45	0.84%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.84%

^[4]

AssetsNet

$ 132,488,107

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Fund net assets	$132,488,107
Total number of portfolio holdings	78
Portfolio turnover for the reporting period	24%

Holdings [Text Block]

Real Estate Sub-industry Allocation

Table Summary
Health Care REITs	22.7%
Retail REITs	17.3%
Industrial REITs	13.4%
Data Center REITs	12.1%
Multi-Family Residential REITs	8.9%
Other Specialized REITs	5.8%
Self Storage REITs	4.9%
Single-Family Residential REITs	4.6%
Hotel & Resort REITs	4.1%
Office REITs	2.4%
Diversified REITs	2.0%
Other	0.7%

Asset Categories

Table Summary
Common Stocks		98.9%
Other		0.6%

Largest Holdings [Text Block]

Top Holdings

Table Summary
Welltower, Inc.	12.5%
Prologis, Inc.	10.0%
Equinix, Inc.	9.2%
Simon Property Group, Inc.	5.3%
Essex Property Trust, Inc.	3.5%
Ventas, Inc.	3.1%
Equity Residential	2.9%
Digital Realty Trust, Inc.	2.8%
Iron Mountain, Inc.	2.7%
Public Storage	2.7%

Material Fund Change [Text Block]

C000032867

Shareholder Report [Line Items]

Fund Name

Columbia Real Estate Equity Fund

Class Name

Institutional Class

Trading Symbol

CREEX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2026 to June 30, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at columbiathreadneedleus.com/resources/literature. You can also request more information by contacting us at 1-800-345-6611.

Additional Information Phone Number

1-800-345-6611

Additional Information Website

columbiathreadneedleus.com/resources/literature

Expenses [Text Block]

What were the Fund costs for the reporting period?

(Based on a hypothetical $10,000 investment)

Table Summary
Class	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Institutional Class	$52	0.97%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

0.97%

^[5]

AssetsNet

$ 132,488,107

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Fund net assets	$132,488,107
Total number of portfolio holdings	78
Portfolio turnover for the reporting period	24%

Holdings [Text Block]

Real Estate Sub-industry Allocation

Table Summary
Health Care REITs	22.7%
Retail REITs	17.3%
Industrial REITs	13.4%
Data Center REITs	12.1%
Multi-Family Residential REITs	8.9%
Other Specialized REITs	5.8%
Self Storage REITs	4.9%
Single-Family Residential REITs	4.6%
Hotel & Resort REITs	4.1%
Office REITs	2.4%
Diversified REITs	2.0%
Other	0.7%

Asset Categories

Table Summary
Common Stocks		98.9%
Other		0.6%

Largest Holdings [Text Block]

Top Holdings

Table Summary
Welltower, Inc.	12.5%
Prologis, Inc.	10.0%
Equinix, Inc.	9.2%
Simon Property Group, Inc.	5.3%
Essex Property Trust, Inc.	3.5%
Ventas, Inc.	3.1%
Equity Residential	2.9%
Digital Realty Trust, Inc.	2.8%
Iron Mountain, Inc.	2.7%
Public Storage	2.7%

Material Fund Change [Text Block]

[1]	Annualized
[2]	Annualized
[3]	Annualized
[4]	Annualized
[5]	Annualized