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Shareholder Report
 12 Months Ended
May 31, 2024
USD ($)
Holdings
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 May 31, 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 annual shareholder report contains important information about Columbia Multi Strategy Alternatives Fund (the Fund) for the period of June 1, 2023 to May 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)
ClassCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class A
$
140		1.33
%
Expenses Paid, Amount $ 140
Expense Ratio, Percent 1.33%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
Top Performance Contributors
Commodity Futures Long/Short sleeve
| The Fund’s allocation to the Commodity Futures Long/Short strategy sleeve was the largest contributing underlying holding within the Fund.
Global macro sleeves
| The Fund’s two subadvised global macro sleeves contributed positively to performance relative to the benchmark. Both sleeves posted strong returns during the period and these two sleeves held a combined Fund weight of approximately 50% during the 1-year period.
Mortgage Opportunities and Global Tactical Asset Allocation sleeves
| The Fund’s allocation to the Mortgage Opportunities strategy and the Global Tactical Asset Allocation strategy also contributed to overall performance of the Fund during the 1-year period.
Derivatives usage
| On a standalone basis, the Fund’s use of derivatives had a positive impact on Fund performance during the period.
Top Performance Detractors
G10 Currency sleeve
| The G10 Currency strategy, focused on investing in short-term debt obligations and currency-linked derivatives, detracted from overall Fund performance during the period. Negative performance within the strategy was driven by security selection for both long and short positions in foreign currencies.
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 yearsSince Fund
Inception
Class A (excluding sales charges)
(a)
10.010.81(2.35
)
Class A (including sales charges)
(a)
3.67(0.36
)
(2.97
)
FTSE One-Month U.S. Treasury Bill Index5.542.101.53
HFRX Global Hedge Fund Index5.893.461.88
Bloomberg Global Aggregate Index0.77(1.62
)
0.00
(a)
The Fund’s performance prior to October 2019 reflects returns achieved by the Investment Manager according to different principal investment strategies. If the Fund’s current management and strategies had been in place for the prior periods, results shown may have been different.
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 539,461,587
Holdings Count | Holdings 1,051
Advisory Fees Paid, Amount $ 6,146,117
Investment Company, Portfolio Turnover 718.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
539,461,587
Total number of portfolio holdings1,051
Management services fees
(represents 0.96% of Fund average net assets)
$
6,146,117
Portfolio turnover for the reporting period 718%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities11%
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 Risk33.8
%
Credit Risk0.7
%
Equity Risk47.2
%
Foreign Exchange Risk363.4
%
Interest Rate Risk341.0
%
Short
Commodity-Related Investment Risk30.8
%
Credit Risk1.1
%
Equity Risk43.4
%
Foreign Exchange Risk361.3
%
Interest Rate Risk378.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Columbia Multi Strategy Alternatives Fund Advisor Class  
Shareholder Report [Line Items]  
Fund Name Columbia Multi Strategy Alternatives Fund
Class Name Advisor Class
Trading Symbol CLFUX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Multi Strategy Alternatives Fund (the Fund) for the period of June 1, 2023 to May 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)
ClassCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Advisor Class
$
114		1.08
%
Expenses Paid, Amount $ 114
Expense Ratio, Percent 1.08%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
Top Performance Contributors
Commodity Futures Long/Short sleeve
| The Fund’s allocation to the Commodity Futures Long/Short strategy sleeve was the largest contributing underlying holding within the Fund.
Global macro sleeves
| The Fund’s two subadvised global macro sleeves contributed positively to performance relative to the benchmark. Both sleeves posted strong returns during the period and these two sleeves held a combined Fund weight of approximately 50% during the 1-year period.
Mortgage Opportunities and Global Tactical Asset Allocation sleeves
| The Fund’s allocation to the Mortgage Opportunities strategy and the Global Tactical Asset Allocation strategy also contributed to overall performance of the Fund during the 1-year period.
Derivatives usage
| On a standalone basis, the Fund’s use of derivatives had a positive impact on Fund performance during the period.
Top Performance Detractors
G10 Currency sleeve
| The G10 Currency strategy, focused on investing in short-term debt obligations and currency-linked derivatives, detracted from overall Fund performance during the period. Negative performance within the strategy was driven by security selection for both long and short positions in foreign currencies.
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 yearsSince Fund
Inception
Advisor Class
(a)
10.261.08(2.10
)
FTSE One-Month U.S. Treasury Bill Index5.542.101.53
HFRX Global Hedge Fund Index5.893.461.88
Bloomberg Global Aggregate Index0.77(1.62
)
0.00
(a)
The Fund’s performance prior to October 2019 reflects returns achieved by the Investment Manager according to different principal investment strategies. If the Fund’s current management and strategies had been in place for the prior periods, results shown may have been different.
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 539,461,587
Holdings Count | Holdings 1,051
Advisory Fees Paid, Amount $ 6,146,117
Investment Company, Portfolio Turnover 718.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
539,461,587
Total number of portfolio holdings1,051
Management services fees
(represents 0.96% of Fund average net assets)
$
6,146,117
Portfolio turnover for the reporting period 718%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities11%
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 su
bj
ect to change.
Derivative Exposure
Long
Commodity-Related Investment Risk33.8
%
Credit Risk0.7
%
Equity Risk47.2
%
Foreign Exchange Risk363.4
%
Interest Rate Risk341.0
%
Short
Commodity-Related Investment Risk30.8
%
Credit Risk1.1
%
Equity Risk43.4
%
Foreign Exchange Risk361.3
%
Interest Rate Risk378.5
%
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 annual shareholder report contains important information about Columbia Multi Strategy Alternatives Fund (the Fund) for the period of June 1, 2023 to May 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)
ClassCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Class C
$
218		2.08
%
Expenses Paid, Amount $ 218
Expense Ratio, Percent 2.08%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
Top Performance Contributors
Commodity Futures Long/Short sleeve
| The Fund’s allocation to the Commodity Futures Long/Short strategy sleeve was the largest contributing underlying holding within the Fund.
Global macro sleeves
| The Fund’s two subadvised global macro sleeves contributed positively to performance relative to the benchmark. Both sleeves posted strong returns during the period and these two sleeves held a combined Fund weight of approximately 50% during the 1-year period.
Mortgage Opportunities and Global Tactical Asset Allocation sleeves
| The Fund’s allocation to the Mortgage Opportunities strategy and the Global Tactical Asset Allocation strategy also contributed to overall performance of the Fund during the 1-year period.
Derivatives usage
| On a standalone basis, the Fund’s use of derivatives had a positive impact on Fund performance during the period.
Top Performance Detractors
G10 Currency sleeve
| The G10 Currency strategy, focused on investing in short-term debt obligations and currency-linked derivatives, detracted from overall Fund performance during the period. Negative performance within the strategy was driven by security selection for both long and short positions in foreign currencies.
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 yearsSince Fund
Inception
Class C (excluding sales charges)
(a)
9.180.06(3.07
)
Class C (including sales charges)
(a)
8.180.06(3.07
)
FTSE One-Month U.S. Treasury Bill Index5.542.101.53
HFRX Global Hedge Fund Index5.893.461.88
Bloomberg Global Aggregate Index0.77(1.62
)
0.00
(a)
The Fund’s performance prior to October 2019 reflects returns achieved by the Investment Manager according to different principal investment strategies. If the Fund’s current management and strategies had been in place for the prior periods, results shown may have been different.
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 539,461,587
Holdings Count | Holdings 1,051
Advisory Fees Paid, Amount $ 6,146,117
Investment Company, Portfolio Turnover 718.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
539,461,587
Total number of portfolio holdings1,051
Management services fees
(represents 0.96% of Fund average net assets)
$
6,146,117
Portfolio turnover for the reporting period 718%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
11
%
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 Risk33.8
%
Credit Risk0.7
%
Equity Risk47.2
%
Foreign Exchange Risk363.4
%
Interest Rate Risk341.0
%
Short
Commodity-Related Investment Risk30.8
%
Credit Risk1.1
%
Equity Risk43.4
%
Foreign Exchange Risk361.3
%
Interest Rate Risk378.5
%
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 annual shareholder report contains important information about Columbia Multi Strategy Alternatives Fund (the Fund) for the period of June 1, 2023 to May 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)
ClassCosts of a $10,000 investmentCosts paid as a percentage of a $10,000 investment
Institutional Class
$
114		1.08
%
Expenses Paid, Amount $ 114
Expense Ratio, Percent 1.08%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
Top Performance Contributors
Commodity Futures Long/Short sleeve
| The Fund’s allocation to the Commodity Futures Long/Short strategy sleeve was the largest contributing underlying holding within the Fund.
Global macro sleeves
| The Fund’s two subadvised global macro sleeves contributed positively to performance relative to the benchmark. Both sleeves posted strong returns during the period and these two sleeves held a combined Fund weight of approximately 50% during the 1-year period.
Mortgage Opportunities and Global Tactical Asset Allocation sleeves
| The Fund’s allocation to the Mortgage Opportunities strategy and the Global Tactical Asset Allocation strategy also contributed to overall performance of the Fund during the 1-year period.
Derivatives usage
| On a standalone basis, the Fund’s use of derivatives had a positive impact on Fund performance during the period.
Top Performance Detractors
G10 Currency sleeve
| The G10 Currency strategy, focused on investing in short-term debt obligations and currency-linked derivatives, detracted from overall Fund performance during the period. Negative performance within the strategy was driven by security selection for both long and short positions in foreign currencies.
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 yearsSince Fund
Inception
Institutional Class
(a)
10.291.06(2.12
)
FTSE One-Month U.S. Treasury Bill Index5.542.101.53
HFRX Global Hedge Fund Index5.893.461.88
Bloomberg Global Aggregate Index0.77(1.62
)
0.00
(a)
The Fund’s performance prior to October 2019 reflects returns achieved by the Investment Manager according to different principal investment strategies. If the Fund’s current management and strategies had been in place for the prior periods, results shown may have been different.
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.
Updated Performance Information Location [Text Block] Visit
columbiathreadneedleus.com/investment-products/mutual-funds
for more recent performance information.
Net Assets $ 539,461,587
Holdings Count | Holdings 1,051
Advisory Fees Paid, Amount $ 6,146,117
Investment Company, Portfolio Turnover 718.00%
Additional Fund Statistics [Text Block]
Key Fu
nd
Statistics
Fund net assets
$
539,461,587
Total number of portfolio holdings1,051
Management services fees
(represents 0.96% of Fund average net assets)
$
6,146,117
Portfolio turnover for the reporting period 718%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities
11
%
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 Risk33.8
%
Credit Risk0.7
%
Equity Risk47.2
%
Foreign Exchange Risk363.4
%
Interest Rate Risk341.0
%
Short
Commodity-Related Investment Risk30.8
%
Credit Risk1.1
%
Equity Risk43.4
%
Foreign Exchange Risk361.3
%
Interest Rate Risk378.5
%
Asset Categories
Graphical Representation - Allocation 1 Chart