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Shareholder Report
 6 Months Ended
Jun. 30, 2025
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, 2025
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 semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
61		1.24
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 61
Expense Ratio, Percent 1.24% [1]
Net Assets $ 153,242,178
Holdings Count | Holding 72
Investment Company, Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
153,242,178
Total number of portfolio holdings
72
Portfolio turnover for the reporting period
22%
Holdings [Text Block]
Graphical Representation of Fund
 
Hol
di
ngs
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Real Estate Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.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 semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
49		0.99
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.99% [1]
Net Assets $ 153,242,178
Holdings Count | Holding 72
Investment Company, Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statis
ti
cs
Fund net assets
$
153,242,178
Total number of portfolio holdings
72
Portfolio turnover for the reporting period
22%
Holdings [Text Block]
Graphical Representatio
n
of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Real Estate Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.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 semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
44		0.89
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.89% [1]
Net Assets $ 153,242,178
Holdings Count | Holding 72
Investment Company, Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
153,242,178
Total number of portfolio holdings
72
Portfolio turnover for the reporting period
22%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is
s
ubject to change.
Top Hold
i
ngs
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Real Estate Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Hold
i
ngs
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.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 semi-annual shareholder report contains important information about Columbia Real Estate Equity Fund (the Fund) for the period of January 1, 2025 to June 30, 2025.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
42		0.85
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.85% [1]
Net Assets $ 153,242,178
Holdings Count | Holding 72
Investment Company, Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
153,242,178
Total number of portfolio holdings
72
Portfolio turnover for the reporting period
22%
Holdings [Text Block]
Graphical R
epr
esentation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's p
ortf
olio composition is subject to change.
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Real Estate Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.2.7
%
Columbia Real Estate Equity Fund - Class S  
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, 2025 to June 30, 2025.
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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
49		0.99
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.99% [1]
Net Assets $ 153,242,178
Holdings Count | Holding 72
Investment Company, Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
153,242,178
Total number of portfolio holdings
72
Portfolio turnover for the reporting period
22%
Holdings [Text Block]
Graphical Representation of Fund
 
Holding
s
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Real Estate Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Welltower, Inc.9.6
%
Equinix, Inc.8.0
%
Prologis, Inc.7.0
%
Public Storage3.9
%
Realty Income Corp.3.7
%
Invitation Homes, Inc.3.2
%
Simon Property Group, Inc.3.1
%
Equity Residential2.8
%
Equity LifeStyle Properties, Inc.2.8
%
Extra Space Storage, Inc.2.7
%
[1] Annualized.