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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 Greater China Fund Class A [Member]  
Shareholder Report [Line Items]  
Fund Name Columbia Greater China Fund
Class Name Class A
Trading Symbol NGCAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Greater China 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
$
84		1.49
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 84
Expense Ratio, Percent 1.49% [1]
Net Assets $ 47,154,617
Holdings Count | Holdings 54
Investment Company, Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
47,154,617
Total number of portfolio holdings54
Portfolio turnover for the reporting period20%
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
Tencent Holdings Ltd.16.2
%
Alibaba Group Holding Ltd.9.7
%
Xiaomi Corp.5.7
%
China Construction Bank Corp., Class H4.6
%
PDD Holdings, Inc., ADR4.4
%
BYD Co., Ltd., Class H4.2
%
Meituan, Class B3.8
%
Trip.com Group Ltd., ADR3.5
%
China Merchants Bank Co., Ltd., Class H2.8
%
NetEase, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Tencent Holdings Ltd.16.2
%
Alibaba Group Holding Ltd.9.7
%
Xiaomi Corp.5.7
%
China Construction Bank Corp., Class H4.6
%
PDD Holdings, Inc., ADR4.4
%
BYD Co., Ltd., Class H4.2
%
Meituan, Class B3.8
%
Trip.com Group Ltd., ADR3.5
%
China Merchants Bank Co., Ltd., Class H2.8
%
NetEase, Inc.2.7
%
Columbia Greater China Fund Institutional Class [Member]  
Shareholder Report [Line Items]  
Fund Name Columbia Greater China Fund
Class Name Institutional Class
Trading Symbol LNGZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Greater China 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]
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
70		1.24
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.24% [1]
Net Assets $ 47,154,617
Holdings Count | Holdings 54
Investment Company, Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Fund net assets
$
47,154,617
Total number of portfolio holdings54
Portfolio turnover for the reporting period20%
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
Tencent Holdings Ltd.16.2
%
Alibaba Group Holding Ltd.9.7
%
Xiaomi Corp.5.7
%
China Construction Bank Corp., Class H4.6
%
PDD Holdings, Inc., ADR4.4
%
BYD Co., Ltd., Class H4.2
%
Meituan, Class B3.8
%
Trip.com Group Ltd., ADR3.5
%
China Merchants Bank Co., Ltd., Class H2.8
%
NetEase, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Tencent Holdings Ltd.16.2
%
Alibaba Group Holding Ltd.9.7
%
Xiaomi Corp.5.7
%
China Construction Bank Corp., Class H4.6
%
PDD Holdings, Inc., ADR4.4
%
BYD Co., Ltd., Class H4.2
%
Meituan, Class B3.8
%
Trip.com Group Ltd., ADR3.5
%
China Merchants Bank Co., Ltd., Class H2.8
%
NetEase, Inc.2.7
%
Columbia Greater China Fund Institutional 3 Class [Member]  
Shareholder Report [Line Items]  
Fund Name Columbia Greater China Fund
Class Name Institutional 3 Class
Trading Symbol CGCYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Columbia Greater China 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]
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
62		1.09
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.09% [1]
Net Assets $ 47,154,617
Holdings Count | Holdings 54
Investment Company, Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Fund net assets
$
47,154,617
Total number of portfolio holdings54
Portfolio turnover for the reporting period20%
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
Tencent Holdings Ltd.16.2
%
Alibaba Group Holding Ltd.9.7
%
Xiaomi Corp.5.7
%
China Construction Bank Corp., Class H4.6
%
PDD Holdings, Inc., ADR4.4
%
BYD Co., Ltd., Class H4.2
%
Meituan, Class B3.8
%
Trip.com Group Ltd., ADR3.5
%
China Merchants Bank Co., Ltd., Class H2.8
%
NetEase, Inc.2.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Tencent Holdings Ltd.16.2
%
Alibaba Group Holding Ltd.9.7
%
Xiaomi Corp.5.7
%
China Construction Bank Corp., Class H4.6
%
PDD Holdings, Inc., ADR4.4
%
BYD Co., Ltd., Class H4.2
%
Meituan, Class B3.8
%
Trip.com Group Ltd., ADR3.5
%
China Merchants Bank Co., Ltd., Class H2.8
%
NetEase, Inc.2.7
%
[1] Annualized.