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Shareholder Report
 6 Months Ended
Feb. 28, 2025
USD ($)
Holdings
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 Feb. 28, 2025
Columbia Select Mid Cap Growth Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Select Mid Cap Growth Fund
Class Name Class A
Trading Symbol CBSAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Select Mid Cap Growth Fund (the Fund) for the period of September 1, 2024 to February 28, 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
$
59		1.11
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.11% [1]
Net Assets $ 1,652,844,695
Holdings Count | Holdings 67
Investment Company, Portfolio Turnover 97.00%
Additional Fund Statistics [Text Block]
Key Fun
d S
tati
stic
s
Fund net assets
$
1,652,844,695
Total number of portfolio holdings67
Portfolio turnover for the reporting period97%
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 subject to change.
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Columbia Select Mid Cap Growth Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Columbia Select Mid Cap Growth Fund
Class Name Class C
Trading Symbol CMCCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Select Mid Cap Growth Fund (the Fund) for the period of September 1, 2024 to February 28, 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 C
$
98		1.86
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 98
Expense Ratio, Percent 1.86% [1]
Net Assets $ 1,652,844,695
Holdings Count | Holdings 67
Investment Company, Portfolio Turnover 97.00%
Additional Fund Statistics [Text Block]
Key Fund S
tatis
tics
Fund net assets
$
1,652,844,695
Total number of portfolio holdings67
Portfolio turnover for the reporting period97%
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 subject to change.
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Columbia Select Mid Cap Growth Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Select Mid Cap Growth Fund
Class Name Institutional Class
Trading Symbol CLSPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Select Mid Cap Growth Fund (the Fund) for the period of September 1, 2024 to February 28, 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
$
46		0.86
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.86% [1]
Net Assets $ 1,652,844,695
Holdings Count | Holdings 67
Investment Company, Portfolio Turnover 97.00%
Additional Fund Statistics [Text Block]
Key Fund
Statist
ics
Fund net assets
$
1,652,844,695
Total number of portfolio holdings67
Portfolio turnover for the reporting period97%
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 subject to change.
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Columbia Select Mid Cap Growth Fund - Institutional 2 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Select Mid Cap Growth Fund
Class Name Institutional 2 Class
Trading Symbol CMGVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Select Mid Cap Growth Fund (the Fund) for the period of September 1, 2024 to February 28, 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		0.82
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.82% [1]
Net Assets $ 1,652,844,695
Holdings Count | Holdings 67
Investment Company, Portfolio Turnover 97.00%
Additional Fund Statistics [Text Block]
Key Fund Stati
stic
s
Fund net assets
$
1,652,844,695
Total number of portfolio holdings67
Portfolio turnover for the reporting period97%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables bel
ow
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
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Columbia Select Mid Cap Growth Fund - Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Select Mid Cap Growth Fund
Class Name Institutional 3 Class
Trading Symbol CMGYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Select Mid Cap Growth Fund (the Fund) for the period of September 1, 2024 to February 28, 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
$
41		0.77
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.77% [1]
Net Assets $ 1,652,844,695
Holdings Count | Holdings 67
Investment Company, Portfolio Turnover 97.00%
Additional Fund Statistics [Text Block]
Key Fund St
atist
ics
Fund net assets
$
1,652,844,695
Total number of portfolio holdings67
Portfolio turnover for the reporting period97%
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 subject to change.
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Columbia Select Mid Cap Growth Fund - Class S  
Shareholder Report [Line Items]  
Fund Name Columbia Select Mid Cap Growth Fund
Class Name Class S
Trading Symbol CLSDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Select Mid Cap Growth Fund (the Fund) for the period of October 2, 2024 to February 28, 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
$
36
(a)
0.86
%
(b)
(a)
Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.
(b)
Annualized.
Expenses Paid, Amount $ 36 [2]
Expense Ratio, Percent 0.86% [1]
Net Assets $ 1,652,844,695
Holdings Count | Holdings 67
Investment Company, Portfolio Turnover 97.00%
Additional Fund Statistics [Text Block]
Key Fund
Statistics
Fund net assets
$
1,652,844,695
Total number of portfolio holdings67
Portfolio turnover for the reporting period97%
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 subject to change.
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Spotify Technology SA3.6
%
Cloudflare, Inc.3.0
%
Take-Two Interactive Software, Inc.3.0
%
Fair Isaac Corp.2.9
%
RBC Bearings, Inc.2.8
%
Targa Resources Corp.2.6
%
LPL Financial Holdings, Inc.2.6
%
XPO, Inc.2.5
%
HubSpot, Inc.2.5
%
Howmet Aerospace, Inc.2.5
%
[1] Annualized.
[2] Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.