Shareholder Report

6 Months Ended

Jun. 30, 2024

USD ($)

Holding

Shareholder Report [Line Items]

Document Type

N-CSRS

Amendment Flag

false

Registrant Name

Columbia Funds Series Trust I

Entity Central Index Key

0000773757

Entity Investment Company Type

N-1A

Document Period End Date

Jun. 30, 2024

Columbia Real Estate Equity Fund Class A

Shareholder Report [Line Items]

Fund Name

Columbia Real Estate Equity Fund

Class Name

Class A

Trading Symbol

CREAX

Annual or Semi-Annual Statement [Text Block]

This semiannual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual shareholder report

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)

Class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$60	1.21%

Expenses Paid, Amount

$ 60

Expense Ratio, Percent

1.21%

Net Assets

$ 155,774,626

Holdings Count | Holding

64

Investment Company, Portfolio Turnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Fund net assets	$155,774,626
Total number of portfolio holdings	64
Portfolio turnover for the reporting period	18%

Holdings [Text Block]

Graphical Representation of Fund Holdings

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Asset Categories

Real Estate Sub-industry Allocation

Largest Holdings [Text Block]

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Columbia Real Estate Equity Fund Advisor Class

Shareholder Report [Line Items]

Fund Name

Columbia Real Estate Equity Fund

Class Name

Advisor Class

Trading Symbol

CRERX

Annual or Semi-Annual Statement [Text Block]

This semiannual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual shareholder report

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)

Class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Advisor Class	$47	0.96%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.96%

Net Assets

$ 155,774,626

Holdings Count | Holding

64

Investment Company, Portfolio Turnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Fund net assets	$155,774,626
Total number of portfolio holdings	64
Portfolio turnover for the reporting period	18%

Holdings [Text Block]

Graphical Representation of Fund Holdings

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Asset Categories

Real Estate Sub-industry Allocation

Largest Holdings [Text Block]

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Columbia Real Estate Equity Fund Institutional Class

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 semiannual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual shareholder report

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)

Class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional Class	$47	0.96%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.96%

Net Assets

$ 155,774,626

Holdings Count | Holding

64

Investment Company, Portfolio Turnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Fund net assets	$155,774,626
Total number of portfolio holdings	64
Portfolio turnover for the reporting period	18%

Holdings [Text Block]

Graphical Representation of Fund Holdings

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Asset Categories

Real Estate Sub-industry Allocation

Largest Holdings [Text Block]

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Columbia Real Estate Equity Fund Institutional 2 Class

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 semiannual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual shareholder report

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)

Class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional 2 Class	$42	0.86%

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.86%

Net Assets

$ 155,774,626

Holdings Count | Holding

64

Investment Company, Portfolio Turnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Fund net assets	$155,774,626
Total number of portfolio holdings	64
Portfolio turnover for the reporting period	18%

Holdings [Text Block]

Graphical Representation of Fund Holdings

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Asset Categories

Real Estate Sub-industry Allocation

Largest Holdings [Text Block]

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Columbia Real Estate Equity Fund Institutional 3 Class

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 semiannual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual shareholder report

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)

Class	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional 3 Class	$40	0.81%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.81%

Net Assets

$ 155,774,626

Holdings Count | Holding

64

Investment Company, Portfolio Turnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Fund net assets	$155,774,626
Total number of portfolio holdings	64
Portfolio turnover for the reporting period	18%

Holdings [Text Block]

Graphical Representation of Fund Holdings

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%

Asset Categories

Real Estate Sub-industry Allocation

Largest Holdings [Text Block]

Top Holdings

Prologis, Inc.	9.5%
Equinix, Inc.	8.9%
Simon Property Group, Inc.	5.7%
Welltower, Inc.	5.6%
Public Storage	4.7%
Equity Residential	4.4%
Invitation Homes, Inc.	3.4%
Extra Space Storage, Inc.	2.9%
Realty Income Corp.	2.8%
Kimco Realty Corp.	2.7%