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Shareholder Report
 6 Months Ended
Oct. 31, 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 Oct. 31, 2024
Columbia Small Cap Value Fund I - Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Class A
Trading Symbol CSMIX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to October 31, 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
$
64		1.22
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.22% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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 co
mp
osition is subject to change.
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Columbia Small Cap Value Fund I - Advisor Class  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Advisor Class
Trading Symbol CVVRX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to October 31, 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
$
51		0.97
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.97% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Columbia Small Cap Value Fund I - Class C  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Class C
Trading Symbol CSSCX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to October 31, 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 C
$
103		1.97
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 103
Expense Ratio, Percent 1.97% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Columbia Small Cap Value Fund I - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Institutional Class
Trading Symbol CSCZX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to October 31, 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
$
51		0.97
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.97% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Columbia Small Cap Value Fund I - Institutional 2 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Institutional 2 Class
Trading Symbol CUURX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to October 31, 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
$
46		0.88
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.88% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Columbia Small Cap Value Fund I - Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Institutional 3 Class
Trading Symbol CSVYX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to October 31, 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
$
44		0.83
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.83% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Columbia Small Cap Value Fund I - Class R  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Class R
Trading Symbol CSVRX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of May 1, 2024 to October 31, 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 R
$
77		1.47
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 77
Expense Ratio, Percent 1.47% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Columbia Small Cap Value Fund I - Class S  
Shareholder Report [Line Items]  
Fund Name Columbia Small Cap Value Fund I
Class Name Class S
Trading Symbol CSCQX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Small Cap Value Fund I (the Fund) for the period of October 2, 2024 to October 31, 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 S
$
7
(a)
0.95
%
(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 $ 7 [2]
Expense Ratio, Percent 0.95% [1]
Net Assets $ 1,499,025,195
Holdings Count | Holding 222
Investment Company, Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,499,025,195
Total number of portfolio holdings222
Portfolio turnover for the reporting period26%
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
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Summit Materials, Inc., Class A1.5
%
Essent Group Ltd.1.3
%
Kirby Corp.1.2
%
Moog, Inc., Class A1.2
%
Kindercare Learning Cos, Inc.1.2
%
National Fuel Gas Co.1.1
%
Macerich Co. (The)1.1
%
John Bean Technologies Corp.1.0
%
UFP Industries, Inc.1.0
%
TXNM Energy, Inc.
1.0
%
[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.