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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
Columbia Emerging Markets Fund Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Emerging Markets Fund
Class Name Class A
Trading Symbol EEMAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Emerging Markets 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
Class A
$
149		1.42
%
Expenses Paid, Amount $ 149
Expense Ratio, Percent 1.42%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Class A shares for the period presented is shown in the
Average
Annual Total Returns table.
Top Performance Contributors
Stock selection
| Selections in the consumer staples, retail
and
electrical equipment sub-sectors boosted the Fund’s results most during the annual period.
Allocations
| Larger allocations to the information technology sector and smaller allocations to the materials sector, particularly within the chemicals and metals and
mining
sub-sectors, buoyed Fund results during the annual period.
Individual holdings
| Positions in MercadoLibre, Inc., an Argentinian company that operates online marketplaces dedicated to e-commerce and online auctions; ASPEED Technology, Inc., a Taiwanese semiconductor devices company; TSMC Co., Ltd., a Taiwanese semiconductor manufacturing company; and SK Hynix, a South Korean semiconductor devices manufacturer, were among the top contributors to Fund performance.
Top Performance Detractors
Stock selection
| Selections in the financials, communication services, energy and industrials sectors hurt the Fund’s results during the annual period.
Allocations
| Large weightings in beverages, hotels restaurants & leisure, consumer staples distribution and retail, and software detracted.
Individual holdings
| Fund positions in Baidu, Inc., a Chinese internet search company; Bank Rakyat, an Indonesia bank; Sands China Ltd., a Hong Kong-based casinos and gaming company; and Meituan, a Chinese online food delivery platform, were top detractors during the period.
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
Class A (excluding sales charges) 9.771.761.95
Class A (including sales charges) 3.440.561.35
MSCI Emerging Markets Index (Net)15.07 4.79 2.56
MSCI EAFE Index (Net)19.40 8.61 5.20
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 $ 1,115,762,572
Holdings Count | Holding 104
Advisory Fees Paid, Amount $ 12,176,489
Investment Company, Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Fund net assets
$
1,115,762,572
Total number of portfolio holdings104
Management services fees
(represents 1.05% of Fund average net assets)
$
12,176,489
Portfolio turnover for the reporting period 44%
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
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Emerging Markets Fund Advisor Class  
Shareholder Report [Line Items]  
Fund Name Columbia Emerging Markets Fund
Class Name Advisor Class
Trading Symbol CEMHX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Emerging Markets 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
Advisor Class
$
123		1.17
%
Expenses Paid, Amount $ 123
Expense Ratio, Percent 1.17%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Advisor Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Stock selection
| Selections in the consumer staples, retail and electrical equipment sub-sectors boosted the Fund’s results most during the annual period.
Allocations
| Larger allocations to the information technology sector and smaller allocations to the materials sector, particularly within the chemicals and metals and mining sub-sectors, buoyed Fund results during the annual period.
Individual holdings
| Positions in MercadoLibre, Inc., an Argentinian company that operates online marketplaces dedicated to e-commerce and online auctions; ASPEED Technology, Inc., a Taiwanese semiconductor devices company; TSMC Co., Ltd., a Taiwanese semiconductor manufacturing company; and SK Hynix, a South Korean semiconductor devices manufacturer, were among the top contributors to Fund performance.
Top Performance Detractors
Stock selection
| Selections in the financials, communication services, energy
and
industrials sectors hurt the Fund’s results during the annual period.
Allocations
| Large weightings in beverages, hotels restaurants & leisure, consumer staples distribution and retail, and software detracted.
Individual holdings
| Fund positions in Baidu, Inc., a Chinese internet search company; Bank Rakyat, an Indonesia bank; Sands China Ltd., a Hong Kong-
based
casinos and gaming company; and Meituan, a Chinese online food delivery platform, were top detractors during the period.
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
Advisor Class 10.11 2.02 2.21
MSCI Emerging Markets Index (Net)15.07 4.79 2.56
MSCI EAFE Index (Net)19.40 8.61 5.20
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 $ 1,115,762,572
Holdings Count | Holding 104
Advisory Fees Paid, Amount $ 12,176,489
Investment Company, Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Fund net assets
$
1,115,762,572
Total number of portfolio holdings104
Management services fees
(represents 1.05% of Fund average net assets)
$
12,176,489
Portfolio turnover for the reporting period 44%
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
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Emerging Markets Fund Class C  
Shareholder Report [Line Items]  
Fund Name Columbia Emerging Markets Fund
Class Name Class C
Trading Symbol EEMCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Emerging Markets 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
Class C
$
227		2.18
%
Expenses Paid, Amount $ 227
Expense Ratio, Percent 2.18%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund
Performance
The performance of Class C shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Stock selection
| Selections in the consumer staples, retail and electrical equipment sub-sectors boosted the Fund’s results most during the annual period.
Allocations
| Larger allocations to the information technology sector and smaller allocations to the materials sector, particularly within the chemicals and metals and mining sub-sectors, buoyed Fund results during the annual period.
Individual holdings
| Positions in MercadoLibre, Inc., an Argentinian company that operates online marketplaces dedicated to e-commerce and online auctions; ASPEED Technology, Inc., a Taiwanese semiconductor devices company; TSMC Co., Ltd., a Taiwanese semiconductor manufacturing company; and SK Hynix, a South Korean semiconductor devices manufacturer, were among the top contributors to Fund performance.
Top Performance Detractors
Stock selection
| Selections in the financials, communication services, energy and industrials sectors hurt the Fund’s results during the annual period.
Allocations
| Large weightings in beverages, hotels restaurants & leisure,
consumer
staples distribution and retail, and software detracted.
Individual holdings
| Fund positions in Baidu, Inc., a Chinese internet search company; Bank Rakyat, an Indonesia bank; Sands China Ltd., a Hong Kong-based casinos and gaming company; and Meituan, a Chinese online food delivery platform, were top detractors during the period.
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
Class C (excluding sales charges) 9.01 1.01 1.20
Class C (including sales charges) 8.01 1.01 1.20
MSCI Emerging Markets Index (Net)15.07 4.79 2.56
MSCI EAFE Index (Net)19.40 8.61 5.20
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 $ 1,115,762,572
Holdings Count | Holding 104
Advisory Fees Paid, Amount $ 12,176,489
Investment Company, Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,115,762,572
Total number of portfolio holdings104
Management services fees
(represents 1.05% of Fund average net assets)
$
12,176,489
Portfolio turnover for the reporting period 44%
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
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Emerging Markets Fund Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Emerging Markets Fund
Class Name Institutional Class
Trading Symbol UMEMX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Emerging Markets 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
$
123		1.17
%
Expenses Paid, Amount $ 123
Expense Ratio, Percent 1.17%
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
| Selections in the consumer staples, retail and electrical equipment sub-sectors boosted the Fund’s results most during the annual period.
Allocations
| Larger allocations to the information technology sector and smaller allocations to the
materials
sector, particularly within the chemicals and metals and mining sub-sectors, buoyed Fund results during the annual period.
Individual holdings
| Positions in MercadoLibre, Inc., an Argentinian company that operates online marketplaces dedicated to e-commerce and online auctions; ASPEED Technology, Inc., a Taiwanese semiconductor devices company; TSMC Co., Ltd., a Taiwanese semiconductor manufacturing company; and SK Hynix, a South Korean semiconductor devices manufacturer, were among the top contributors to Fund performance.
Top Performance Detractors
Stock selection
| Selections in the financials, communication services, energy and industrials sectors hurt the Fund’s results during the annual period.
Allocations
| Large weightings in beverages, hotels restaurants &
leisure
, consumer staples distribution and retail, and software detracted.
Individual holdings
| Fund positions in Baidu, Inc., a Chinese internet search company; Bank Rakyat, an Indonesia bank; Sands China Ltd., a Hong Kong-based casinos and gaming company; and Meituan, a Chinese online food delivery platform, were top detractors during the period.
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 10.10 2.02 2.21
MSCI Emerging Markets Index (Net)15.07 4.79 2.56
MSCI EAFE Index (Net)19.40 8.61 5.20
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 $ 1,115,762,572
Holdings Count | Holding 104
Advisory Fees Paid, Amount $ 12,176,489
Investment Company, Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,115,762,572
Total number of portfolio holdings104
Management services fees
(represents 1.05% of Fund average net assets)
$
12,176,489
Portfolio turnover for the reporting period 44%
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
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Emerging Markets Fund Institutional 2 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Emerging Markets Fund
Class Name Institutional 2 Class
Trading Symbol CEKRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Emerging Markets 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 2 Class
$
112		1.07
%
Expenses Paid, Amount $ 112
Expense Ratio, Percent 1.07%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Institutional 2 Class shares for the
period
presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Stock selection
| Selections in the consumer staples, retail and electrical equipment sub-sectors boosted the Fund’s results most during the annual period.
Allocations
| Larger allocations to the information technology sector and smaller allocations to the materials sector, particularly within the chemicals and metals and mining sub-sectors, buoyed Fund results during the annual period.
Individual holdings
| Positions in MercadoLibre, Inc., an Argentinian company that operates online marketplaces dedicated to e-commerce and online auctions; ASPEED Technology, Inc., a Taiwanese semiconductor devices company; TSMC Co., Ltd., a Taiwanese semiconductor manufacturing company; and SK Hynix, a South Korean semiconductor devices
manufacturer
, were among the top contributors to Fund performance.
Top Performance Detractors
Stock selection
| Selections in the financials, communication services, energy and industrials sectors hurt the Fund’s results during the annual period.
Allocations
| Large weightings in beverages, hotels restaurants & leisure, consumer staples distribution and retail, and software detracted.
Individual holdings
| Fund positions in Baidu, Inc., a Chinese internet search company; Bank Rakyat, an Indonesia bank; Sands China Ltd., a Hong Kong-based casinos and gaming company; and Meituan, a Chinese online food delivery platform, were top detractors during the period.
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 2 Class 10.172.142.34
MSCI Emerging Markets Index (Net)15.07 4.79 2.56
MSCI EAFE Index (Net)19.40 8.61 5.20
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 $ 1,115,762,572
Holdings Count | Holding 104
Advisory Fees Paid, Amount $ 12,176,489
Investment Company, Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,115,762,572
Total number of portfolio holdings104
Management services fees
(represents 1.05% of Fund average net assets)
$
12,176,489
Portfolio turnover for the reporting period 44%
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
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds
Columbia Emerging Markets Fund Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Emerging Markets Fund
Class Name Institutional 3 Class
Trading Symbol CEKYX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Columbia Emerging Markets 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 3 Class
$
108		1.03
%
Expenses Paid, Amount $ 108
Expense Ratio, Percent 1.03%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The performance of Institutional 3 Class shares for the period presented is shown in the Average Annual Total Returns table.
Top Performance Contributors
Stock selection
| Selections in the consumer staples, retail and
electrical
equipment sub-sectors boosted the Fund’s results most during the annual period.
Allocations
| Larger allocations to the information technology sector and smaller allocations to the materials sector, particularly within the chemicals and metals and mining sub-sectors, buoyed Fund results during the annual period.
Individual holdings
| Positions in MercadoLibre, Inc., an Argentinian company that operates online marketplaces dedicated to e-commerce and online auctions; ASPEED Technology, Inc., a Taiwanese semiconductor devices company; TSMC Co., Ltd., a Taiwanese semiconductor manufacturing company; and SK Hynix, a South Korean semiconductor devices manufacturer, were among the top contributors to Fund performance.
Top Performance Detractors
Stock selection
| Selections in the financials, communication services, energy and industrials sectors hurt the Fund’s results during the annual period.
Allocations
| Large weightings in beverages, hotels restaurants & leisure, consumer staples
distribution
and retail, and software detracted.
Individual holdings
| Fund positions in Baidu, Inc., a Chinese internet search company; Bank Rakyat, an Indonesia bank; Sands China Ltd., a Hong Kong-based casinos and gaming company; and Meituan, a Chinese online food delivery platform, were top detractors during the period.
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 3 Class 10.292.182.39
MSCI Emerging Markets Index (Net)15.07 4.79 2.56
MSCI EAFE Index (Net)19.40 8.61 5.20
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 $ 1,115,762,572
Holdings Count | Holding 104
Advisory Fees Paid, Amount $ 12,176,489
Investment Company, Portfolio Turnover 44.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,115,762,572
Total number of portfolio holdings104
Management services fees
(represents 1.05% of Fund average net assets)
$
12,176,489
Portfolio turnover for the reporting period 44%
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
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Equity Sector Allocation
Graphical Representation - Allocation 1 Chart
Geographic Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Taiwan Semiconductor Manufacturing Co., Ltd.11.2
%
Tencent Holdings Ltd.5.2
%
Samsung Electronics Co., Ltd.5.1
%
SK Hynix, Inc.2.9
%
PT Bank Central Asia Tbk2.7
%
ICICI Bank Ltd., ADR2.5
%
MercadoLibre, Inc.2.3
%
Larsen & Toubro Ltd.2.1
%
PT Bank Rakyat Indonesia Persero Tbk1.9
%
MediaTek, Inc.1.8
%
Updated Prospectus Web Address columbiathreadneedleus.com/investment-products/mutual-funds