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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 Alternative Strategies Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Multi-Manager Alternative Strategies Fund
Class Name Institutional Class
Trading Symbol CZAMX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Multi-Manager Alternative 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
$
132		1.30
%
Expenses Paid, Amount $ 132
Expense Ratio, Percent 1.30%
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
Allocation
| Positive contributions to the Fund’s absolute performance came from positioning in equities, corporate bonds, securitized credit and agricultural commodities.
Fixed income
| Overweight positioning in agency and non-agency mortgage-backed securities was a strong contributor to absolute returns despite volatile fixed-income markets. Corporate bonds, especially within the high-yield sector, also served as key contributors during the period.
Equities
| Long positioning in U.S. and European stock indices benefited the Fund’s absolute returns. Selective positioning in Asian equity markets, such as Taiwan and Japan, also contributed to positive performance, as those regions rallied over the period.
Commodities
| Long positioning in cocoa markets contributed positively to absolute results over the period. Climate change-induced droughts resulted in shortages of global cocoa supplies, contributing to historically high cocoa futures prices that benefited the Fund’s portfolio.
Top Performance Detractors
Currency
| Weak performance from currency positioning weighed on absolute returns. Price trend reversals and volatility in many currency pairs, especially the New Zealand dollar and Australian dollar, resulted in performance detraction, despite strong returns from positioning in the Japanese yen.
Commodities
| Unstable trends in energy prices weighed on the Fund’s results. Several price reversals in energy markets, especially crude oil, had a negative impact on performance. Geopolitical tensions, coupled with demand deceleration from China, created a roller coaster in energy markets.
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)
4.182.871.35
FTSE Three-Month U.S. Treasury Bill Index5.65 2.33 1.62
Bloomberg Global Aggregate Index6.90 (1.37
)
0.12
(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 performance to the Bloomberg Global Aggregate 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 represents 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 performance to the Bloomberg Global Aggregate 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 represents 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 $ 476,718,414
Holdings Count | Holding 1,524
Advisory Fees Paid, Amount $ 4,920,131
Investment Company, Portfolio Turnover 141.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
476,718,414
Total number of portfolio holdings1,524
Management services fees
(represents 1.10% of Fund average net assets)
$
4,920,131
Portfolio turnover for the reporting period 141%
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 Risk3.6
%
Equity Risk11.9
%
Foreign Exchange Risk61.5
%
Interest Rate Risk70.7
%
Short
Commodity-Related Investment Risk7.4
%
Equity Risk0.7
%
Foreign Exchange Risk55.8
%
Interest Rate Risk15.9
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds