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Shareholder Report
 6 Months Ended
Jan. 31, 2025
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 Jan. 31, 2025
Columbia Ultra Short Term Bond Fund Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Ultra Short Term Bond Fund
Class Name Class A
Trading Symbol CUSOX
Annual or Semi-Annual Statement [Text Block] This
semi-annual shareholder report
contains important information about Columbia Ultra Short Term Bond Fund (the Fund) for the period of August 1, 2024 to January 31, 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
$
22		0.44
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.44% [1]
Net Assets $ 1,075,597,829
Holdings Count | Holding 229
Investment Company, Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,075,597,829
Total number of portfolio holdings229
Portfolio turnover for the reporting period42%
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.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
SBNA Auto Lease Trust
04/20/2027 6.510%		1.7
%
VCAT LLC
09/25/2054 5.977%		1.5
%
Santander Drive Auto Receivables Trust
04/17/2028 5.250%		1.5
%
Carmax Auto Owner Trust
05/15/2028 5.280%		1.4
%
Verizon Master Trust
04/13/2028 4.890%		1.4
%
Westlake Automobile Receivables Trust
01/15/2027 2.120%		1.3
%
Affirm Asset Securitization Trust
12/17/2029 5.220%		1.3
%
Volkswagen Auto Loan Enhanced Trust
11/22/2027 4.650%		1.2
%
Enterprise Fleet Financing LLC
08/20/2027 1.220%		1.0
%
GMF Floorplan Owner Revolving Trust
06/15/2028 5.340%		1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
SBNA Auto Lease Trust
04/20/2027 6.510%		1.7
%
VCAT LLC
09/25/2054 5.977%		1.5
%
Santander Drive Auto Receivables Trust
04/17/2028 5.250%		1.5
%
Carmax Auto Owner Trust
05/15/2028 5.280%		1.4
%
Verizon Master Trust
04/13/2028 4.890%		1.4
%
Westlake Automobile Receivables Trust
01/15/2027 2.120%		1.3
%
Affirm Asset Securitization Trust
12/17/2029 5.220%		1.3
%
Volkswagen Auto Loan Enhanced Trust
11/22/2027 4.650%		1.2
%
Enterprise Fleet Financing LLC
08/20/2027 1.220%		1.0
%
GMF Floorplan Owner Revolving Trust
06/15/2028 5.340%		1.0
%
Columbia Ultra Short Term Bond Fund Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Ultra Short Term Bond Fund
Class Name Institutional Class
Trading Symbol CUSBX
Annual or Semi-Annual Statement [Text Block] This
semi-annual shareholder report
contains important information about Columbia Ultra Short Term Bond Fund (the Fund) for the period of August 1, 2024 to January 31, 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
Institutional Class
$
15		0.29
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.29% [1]
Net Assets $ 1,075,597,829
Holdings Count | Holding 229
Investment Company, Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,075,597,829
Total number of portfolio holdings229
Portfolio turnover for the reporting period42%
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.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
SBNA Auto Lease Trust
04/20/2027 6.510%		1.7
%
VCAT LLC
09/25/2054 5.977%		1.5
%
Santander Drive Auto Receivables Trust
04/17/2028 5.250%		1.5
%
Carmax Auto Owner Trust
05/15/2028 5.280%		1.4
%
Verizon Master Trust
04/13/2028 4.890%		1.4
%
Westlake Automobile Receivables Trust
01/15/2027 2.120%		1.3
%
Affirm Asset Securitization Trust
12/17/2029 5.220%		1.3
%
Volkswagen Auto Loan Enhanced Trust
11/22/2027 4.650%		1.2
%
Enterprise Fleet Financing LLC
08/20/2027 1.220%		1.0
%
GMF Floorplan Owner Revolving Trust
06/15/2028 5.340%		1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
SBNA Auto Lease Trust
04/20/2027 6.510%		1.7
%
VCAT LLC
09/25/2054 5.977%		1.5
%
Santander Drive Auto Receivables Trust
04/17/2028 5.250%		1.5
%
Carmax Auto Owner Trust
05/15/2028 5.280%		1.4
%
Verizon Master Trust
04/13/2028 4.890%		1.4
%
Westlake Automobile Receivables Trust
01/15/2027 2.120%		1.3
%
Affirm Asset Securitization Trust
12/17/2029 5.220%		1.3
%
Volkswagen Auto Loan Enhanced Trust
11/22/2027 4.650%		1.2
%
Enterprise Fleet Financing LLC
08/20/2027 1.220%		1.0
%
GMF Floorplan Owner Revolving Trust
06/15/2028 5.340%		1.0
%
Columbia Ultra Short Term Bond Fund Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Ultra Short Term Bond Fund
Class Name Institutional 3 Class
Trading Symbol CMGUX
Annual or Semi-Annual Statement [Text Block] This
semi-annual shareholder report
contains important information about Columbia Ultra Short Term Bond Fund (the Fund) for the period of August 1, 2024 to January 31, 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
Institutional 3 Class
$
12		0.24
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.24% [1]
Net Assets $ 1,075,597,829
Holdings Count | Holding 229
Investment Company, Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,075,597,829
Total number of portfolio holdings229
Portfolio turnover for the reporting period42%
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.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
SBNA Auto Lease Trust
04/20/2027 6.510%		1.7
%
VCAT LLC
09/25/2054 5.977%		1.5
%
Santander Drive Auto Receivables Trust
04/17/2028 5.250%		1.5
%
Carmax Auto Owner Trust
05/15/2028 5.280%		1.4
%
Verizon Master Trust
04/13/2028 4.890%		1.4
%
Westlake Automobile Receivables Trust
01/15/2027 2.120%		1.3
%
Affirm Asset Securitization Trust
12/17/2029 5.220%		1.3
%
Volkswagen Auto Loan Enhanced Trust
11/22/2027 4.650%		1.2
%
Enterprise Fleet Financing LLC
08/20/2027 1.220%		1.0
%
GMF Floorplan Owner Revolving Trust
06/15/2028 5.340%		1.0
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
SBNA Auto Lease Trust
04/20/2027 6.510%		1.7
%
VCAT LLC
09/25/2054 5.977%		1.5
%
Santander Drive Auto Receivables Trust
04/17/2028 5.250%		1.5
%
Carmax Auto Owner Trust
05/15/2028 5.280%		1.4
%
Verizon Master Trust
04/13/2028 4.890%		1.4
%
Westlake Automobile Receivables Trust
01/15/2027 2.120%		1.3
%
Affirm Asset Securitization Trust
12/17/2029 5.220%		1.3
%
Volkswagen Auto Loan Enhanced Trust
11/22/2027 4.650%		1.2
%
Enterprise Fleet Financing LLC
08/20/2027 1.220%		1.0
%
GMF Floorplan Owner Revolving Trust
06/15/2028 5.340%		1.0
%
[1] Annualized.