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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
Multi-Manager Growth Strategies Fund Institutional Class  
Shareholder Report [Line Items]  
Fund Name Multi-Manager Growth Strategies Fund
Class Name Institutional Class
Trading Symbol CZMGX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Multi-Manager Growth Strategies 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
$
40		0.74
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.74% [1]
Net Assets $ 4,709,633,917
Holdings Count | Holding 157
Investment Company, Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
4,709,633,917
Total number of portfolio holdings157
Portfolio turnover for the reporting period 24%
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.9.5
%
Microsoft Corp.8.5
%
Meta Platforms, Inc., Class A6.1
%
Amazon.com, Inc.5.8
%
Apple, Inc.5.4
%
Tesla, Inc.3.7
%
Netflix, Inc.3.4
%
Alphabet, Inc., Class A3.0
%
Oracle Corp.2.9
%
Eli Lilly & Co.2.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
NVIDIA Corp.9.5
%
Microsoft Corp.8.5
%
Meta Platforms, Inc., Class A6.1
%
Amazon.com, Inc.5.8
%
Apple, Inc.5.4
%
Tesla, Inc.3.7
%
Netflix, Inc.3.4
%
Alphabet, Inc., Class A3.0
%
Oracle Corp.2.9
%
Eli Lilly & Co.2.5
%
[1] Annualized.