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Shareholder Report
6 Months Ended
Nov. 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 Nov. 30, 2024
Columbia Multi Strategy Alternatives Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Multi Strategy Alternatives Fund
Class Name Class A
Trading Symbol CLAAX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Multi Strategy Alternatives Fund (the Fund) for the period of June 1, 2024 to November 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
$
68
1.36
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 68
Expense Ratio, Percent 1.36% [1]
Net Assets $ 522,181,715
Holdings Count | Holding 1,048
Investment Company, Portfolio Turnover 364.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
522,181,715
Total number of portfolio holdings1,048
Portfolio turnover for the reporting period364%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities9%
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.
Derivative Exposure
Long
Commodity-Related Investment Risk34.8
%
Credit Risk0.7
%
Equity Risk38.9
%
Foreign Exchange Risk379.4
%
Interest Rate Risk274.4
%
Short
Commodity-Related Investment Risk30.0
%
Credit Risk1.1
%
Equity Risk38.9
%
Foreign Exchange Risk318.3
%
Interest Rate Risk290.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Columbia Multi Strategy Alternatives Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Columbia Multi Strategy Alternatives Fund
Class Name Class C
Trading Symbol CLABX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Multi Strategy Alternatives Fund (the Fund) for the period of June 1, 2024 to November 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 C
$
105
2.11
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 105
Expense Ratio, Percent 2.11% [1]
Net Assets $ 522,181,715
Holdings Count | Holding 1,048
Investment Company, Portfolio Turnover 364.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
522,181,715
Total number of portfolio holdings1,048
Portfolio turnover for the reporting period364%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities9%
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.
Derivative Exposure
Long
Commodity-Related Investment Risk34.8
%
Credit Risk0.7
%
Equity Risk38.9
%
Foreign Exchange Risk379.4
%
Interest Rate Risk274.4
%
Short
Commodity-Related Investment Risk30.0
%
Credit Risk1.1
%
Equity Risk38.9
%
Foreign Exchange Risk318.3
%
Interest Rate Risk290.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Columbia Multi Strategy Alternatives Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Multi Strategy Alternatives Fund
Class Name Institutional Class
Trading Symbol CLAZX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Multi Strategy Alternatives Fund (the Fund) for the period of June 1, 2024 to November 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
$
55
1.11
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.11% [1]
Net Assets $ 522,181,715
Holdings Count | Holding 1,048
Investment Company, Portfolio Turnover 364.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
522,181,715
Total number of portfolio holdings1,048
Portfolio turnover for the reporting period364%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities9%
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.
Derivative Exposure
Long
Commodity-Related Investment Risk34.8
%
Credit Risk0.7
%
Equity Risk38.9
%
Foreign Exchange Risk379.4
%
Interest Rate Risk274.4
%
Short
Commodity-Related Investment Risk30.0
%
Credit Risk1.1
%
Equity Risk38.9
%
Foreign Exchange Risk318.3
%
Interest Rate Risk290.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
[1] Annualized.