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Shareholder Report
 6 Months Ended
Sep. 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 Sep. 30, 2024
Columbia Select Large Cap Growth Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Select Large Cap Growth Fund
Class Name Class A
Trading Symbol ELGAX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Select Large Cap Growth Fund (the Fund) for the period of April 1, 2024 to September 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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
54		1.05
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 54
Expense Ratio, Percent 1.05% [1]
Net Assets $ 1,069,914,788
Holdings Count | Holding 28
Investment Company, Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,069,914,788
Total number of portfolio holdings28
Portfolio turnover for the reporting period 18%
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
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Information Technology Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Columbia Select Large Cap Growth Fund - Advisor Class  
Shareholder Report [Line Items]  
Fund Name Columbia Select Large Cap Growth Fund
Class Name Advisor Class
Trading Symbol CSRRX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Select Large Cap Growth Fund (the Fund) for the period of April 1, 2024 to September 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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Advisor Class
$
41		0.80
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.80% [1]
Net Assets $ 1,069,914,788
Holdings Count | Holding 28
Investment Company, Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,069,914,788
Total number of portfolio holdings28
Portfolio turnover for the reporting period 18%
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 chan
ge.
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Information Technology Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Columbia Select Large Cap Growth Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Select Large Cap Growth Fund
Class Name Institutional Class
Trading Symbol UMLGX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Select Large Cap Growth Fund (the Fund) for the period of April 1, 2024 to September 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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
41		0.80
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.80% [1]
Net Assets $ 1,069,914,788
Holdings Count | Holding 28
Investment Company, Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,069,914,788
Total number of portfolio holdings28
Portfolio turnover for the reporting period 18%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund rep
r
esented 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
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Information Technology Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Columbia Select Large Cap Growth Fund - Institutional 2 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Select Large Cap Growth Fund
Class Name Institutional 2 Class
Trading Symbol CGTRX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Select Large Cap Growth Fund (the Fund) for the period of April 1, 2024 to September 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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 2 Class
$
36		0.69
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.69% [1]
Net Assets $ 1,069,914,788
Holdings Count | Holding 28
Investment Company, Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,069,914,788
Total number of portfolio holdings28
Portfolio turnover for the reporting period 18%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund
ne
t assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Information Technology Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Columbia Select Large Cap Growth Fund - Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Select Large Cap Growth Fund
Class Name Institutional 3 Class
Trading Symbol CCWRX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Select Large Cap Growth Fund (the Fund) for the period of April 1, 2024 to September 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)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
33		0.64
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.64% [1]
Net Assets $ 1,069,914,788
Holdings Count | Holding 28
Investment Company, Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,069,914,788
Total number of portfolio holdings28
Portfolio turnover for the reporting period 18%
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 sub
je
ct to change.
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Information Technology Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Columbia Select Large Cap Growth Fund - Class R  
Shareholder Report [Line Items]  
Fund Name Columbia Select Large Cap Growth Fund
Class Name Class R
Trading Symbol URLGX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Select Large Cap Growth Fund (the Fund) for the period of April 1, 2024 to September 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)
ClassCost of a $10,000 inve
st
ment		Cost paid as a percentage of a $10,000 investment
Class R
$
67		1.30
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 67
Expense Ratio, Percent 1.30% [1]
Net Assets $ 1,069,914,788
Holdings Count | Holding 28
Investment Company, Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,069,914,788
Total number of portfolio holdings28
Portfolio turnover for the reporting period 18%
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
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Information Technology Sub-industry Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
NVIDIA Corp.9.3
%
Microsoft Corp.8.1
%
Amazon.com, Inc.7.7
%
Alphabet, Inc., Class A5.0
%
Intuitive Surgical, Inc.4.8
%
Adobe, Inc.4.7
%
ServiceNow, Inc.4.4
%
Eli Lilly & Co.4.4
%
Trade Desk, Inc. (The), Class A3.7
%
Booking Holdings, Inc.3.6
%
[1] Annualized.