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Shareholder Report
 12 Months Ended
Aug. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
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 Aug. 31, 2024
Multi-Manager Small Cap Equity Strategies Fund Institutional Class  
Shareholder Report [Line Items]  
Fund Name Multi-Manager Small Cap Equity Strategies Fund
Class Name Institutional Class
Trading Symbol CZMSX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Multi-Manager Small Cap Equity Strategies Fund (the Fund) for the period of September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual 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
$
106		0.99
%
Expenses Paid, Amount $ 106
Expense Ratio, Percent 0.99%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Institutional Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Stock selection
| Selection within the financials (notably within the banks industry) and utilities sectors was most impactful on relative returns.
Allocations
| An overweight to the information technology sector benefited relative performance. Underweights to the utilities, energy and health care sectors all benefited relative results as well.
Individual holdings
| Positions in AAON, Construction Partners and Casella Waste Systems were among the top relative contributors to Fund performance.
Top Performance Detractors
Stock selection
| Selection within the health care and consumer discretionary sectors detracted most from relative returns during the annual period. Relative performance within the biotechnology industry of the health care sector was particularly challenging, as was the software industry within the information technology sector.
Allocations
| A small cash allocation was a drag on performance relative to the Fund’s Russell 2000 Index benchmark.
Individual holdings
| The two largest relative detractors, MicroStrategy and Carvana, were strong performing stocks in the benchmark but were not owned by the Fund. Fox Factory, Paycor HCM and Stevanto Group were also top relative detractors.
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future performance.
Line Graph [Table Text Block]
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns (%)1 year5 years10 years
Institutional Class
(a),(b)
14.779.778.22
Russell
®
2000 Index		18.479.688.03
Russell
®
3000 Index		26.1415.1912.36
(a)
The returns shown for periods prior to January 3, 2017 (including returns for the Life of the Fund, if shown, which are since Fund inception) include the returns of Class A. Class A shares were offered prior to the Fund's Institutional Class shares but have since been merged into the Fund’s Institutional Class shares. These returns are adjusted to reflect any higher class-related operating expenses of the newer share classes, as applicable. Please visit
columbiathreadneedleus.com/investor/investment-products/mutual-funds/appended-performance
for more information.
(b)
Effective August 1, 2024, the Fund compares its performace to the Russell
®
3000 Index, a broad-based performance index that meets new regulatory requirements. The Fund's performance is also compared to its prior benchmark, which more closely represent the market sectors and/or asset classes in which the Fund primarily invests.
No Deduction of Taxes [Text Block] Performance does not reflect the deduction of taxes that a shareholder may pay on fund distributions or on the redemptions of fund shares.
Performance Table Market Index Changed [Text Block] Effective August 1, 2024, the Fund compares its performace to the Russell
®
3000 Index, a broad-based performance index that meets new regulatory requirements.
Prior Market Index Comparison [Text Block] The Fund's performance is also compared to its prior benchmark, which more closely represent the market sectors and/or asset classes in which the Fund primarily invests.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 1,648,637,831
Holdings Count | Holding 795
Advisory Fees Paid, Amount $ 12,095,254
Investment Company, Portfolio Turnover 66.00%
Additional Fund Statistics [Text Block]
Key Fund
Statistics
Fund net assets
$
1,648,637,831
Total number of portfolio holdings795
Management services fees
(represents 0.82% of Fund average net assets)
$
12,095,254
Portfolio turnover for the reporting period 66%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a perce
ntage of Fun
d net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Top Holdings
Casella Waste Systems, Inc., Class A1.6
%
Simpson Manufacturing Co., Inc.1.2
%
AAON, Inc.1.2
%
Descartes Systems Group, Inc. (The)1.1
%
Exponent, Inc.1.0
%
SPS Commerce, Inc.0.8
%
Novanta, Inc.0.8
%
FirstService Corp.0.8
%
Altair Engineering, Inc., Class A0.8
%
Construction Partners, Inc., Class A0.7
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Casella Waste Systems, Inc., Class A1.6
%
Simpson Manufacturing Co., Inc.1.2
%
AAON, Inc.1.2
%
Descartes Systems Group, Inc. (The)1.1
%
Exponent, Inc.1.0
%
SPS Commerce, Inc.0.8
%
Novanta, Inc.0.8
%
FirstService Corp.0.8
%
Altair Engineering, Inc., Class A0.8
%
Construction Partners, Inc., Class A0.7
%
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds