Columbia Balanced Fund (CBALX) N-CSRS 5 Dec 24 Certified semi-annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	6 Months Ended
	Sep. 30, 2024
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	Sep. 30, 2024

Shareholder Report

Shareholder Report	6 Months Ended
	Sep. 30, 2024 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	Sep. 30, 2024
Columbia Select Large Cap Growth Fund - Class A
Shareholder Report [Line Items]
Fund Name	Columbia Select Large Cap Growth Fund
Class Name	Class A
Trading Symbol	ELGAX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
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 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Class A $ 1.05 % (a) (a) Annualized.
Expenses Paid, Amount	$ 54
Expense Ratio, Percent	1.05%	[1]
Net Assets	$ 1,069,914,788
Holdings Count | Holding	28
Investment Company, Portfolio Turnover	18%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 28 Portfolio turnover for the reporting period 18%
Holdings [Text Block]	Graphical Representation of Fund 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 NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 % Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 %
Columbia Select Large Cap Growth Fund - Advisor Class
Shareholder Report [Line Items]
Fund Name	Columbia Select Large Cap Growth Fund
Class Name	Advisor Class
Trading Symbol	CSRRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
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 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Advisor Class $ 0.80 % (a) (a) Annualized.
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.80%	[1]
Net Assets	$ 1,069,914,788
Holdings Count | Holding	28
Investment Company, Portfolio Turnover	18%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 28 Portfolio turnover for the reporting period 18%
Holdings [Text Block]	Graphical Representation of Fund 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 chan ge. Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 % Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 %
Columbia Select Large Cap Growth Fund - Institutional Class
Shareholder Report [Line Items]
Fund Name	Columbia Select Large Cap Growth Fund
Class Name	Institutional Class
Trading Symbol	UMLGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
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 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional Class $ 0.80 % (a) (a) Annualized.
Expenses Paid, Amount	$ 41
Expense Ratio, Percent	0.80%	[1]
Net Assets	$ 1,069,914,788
Holdings Count | Holding	28
Investment Company, Portfolio Turnover	18%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 28 Portfolio turnover for the reporting period 18%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund rep r of Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 % Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 %
Columbia Select Large Cap Growth Fund - Institutional 2 Class
Shareholder Report [Line Items]
Fund Name	Columbia Select Large Cap Growth Fund
Class Name	Institutional 2 Class
Trading Symbol	CGTRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
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 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 2 Class $ 0.69 % (a) (a) Annualized.
Expenses Paid, Amount	$ 36
Expense Ratio, Percent	0.69%	[1]
Net Assets	$ 1,069,914,788
Holdings Count | Holding	28
Investment Company, Portfolio Turnover	18%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 28 Portfolio turnover for the reporting period 18%
Holdings [Text Block]	Graphical Representation of Fund The tables below show the investment makeup of the Fund represented as a percentage of Fund ne Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 % Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 %
Columbia Select Large Cap Growth Fund - Institutional 3 Class
Shareholder Report [Line Items]
Fund Name	Columbia Select Large Cap Growth Fund
Class Name	Institutional 3 Class
Trading Symbol	CCWRX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
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 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) Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment Institutional 3 Class $ 0.64 % (a) (a) Annualized.
Expenses Paid, Amount	$ 33
Expense Ratio, Percent	0.64%	[1]
Net Assets	$ 1,069,914,788
Holdings Count | Holding	28
Investment Company, Portfolio Turnover	18%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 28 Portfolio turnover for the reporting period 18%
Holdings [Text Block]	Graphical Representation of Fund 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 sub je Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 % Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 %
Columbia Select Large Cap Growth Fund - Class R
Shareholder Report [Line Items]
Fund Name	Columbia Select Large Cap Growth Fund
Class Name	Class R
Trading Symbol	URLGX
Annual or Semi-Annual Statement [Text Block]	This semiannual shareholder report
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 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) Class Cost of a $10,000 inve st Cost paid as a percentage of a $10,000 investment Class R $ 1.30 % (a) (a) Annualized.
Expenses Paid, Amount	$ 67
Expense Ratio, Percent	1.30%	[1]
Net Assets	$ 1,069,914,788
Holdings Count | Holding	28
Investment Company, Portfolio Turnover	18%
Additional Fund Statistics [Text Block]	Key Fund Statistics Fund net assets $ Total number of portfolio holdings 28 Portfolio turnover for the reporting period 18%
Holdings [Text Block]	Graphical Representation of Fund 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 NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 % Equity Sector Allocation Information Technology Sub-industry Allocation
Largest Holdings [Text Block]	Top Holdings NVIDIA Corp. 9.3 % Microsoft Corp. 8.1 % Amazon.com, Inc. 7.7 % Alphabet, Inc., Class A 5.0 % Intuitive Surgical, Inc. 4.8 % Adobe, Inc. 4.7 % ServiceNow, Inc. 4.4 % Eli Lilly & Co. 4.4 % Trade Desk, Inc. (The), Class A 3.7 % Booking Holdings, Inc. 3.6 %
[1]Annualized.

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Sep. 30, 2024
Columbia Select Large Cap Growth Fund - Class R | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.30%
Columbia Select Large Cap Growth Fund - Class R | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Select Large Cap Growth Fund - Class R | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.70%
Columbia Select Large Cap Growth Fund - Class R | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Select Large Cap Growth Fund - Class R | Intuitive Surgical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Select Large Cap Growth Fund - Class R | Adobe, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Select Large Cap Growth Fund - Class R | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Class R | Eli Lilly & Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Class R | Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.70%
Columbia Select Large Cap Growth Fund - Class R | Booking Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Select Large Cap Growth Fund - Class R | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
Columbia Select Large Cap Growth Fund - Class R | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.60%
Columbia Select Large Cap Growth Fund - Class R | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.90%
Columbia Select Large Cap Growth Fund - Class R | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Select Large Cap Growth Fund - Class R | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Columbia Select Large Cap Growth Fund - Class R | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Columbia Select Large Cap Growth Fund - Class R | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Select Large Cap Growth Fund - Class R | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Select Large Cap Growth Fund - Class R | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Columbia Select Large Cap Growth Fund - Class R | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Select Large Cap Growth Fund - Class R | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.90%
Columbia Select Large Cap Growth Fund - Class R | Semiconductor Materials and Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.30%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.70%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Intuitive Surgical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Adobe, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Eli Lilly & Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.70%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Booking Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.60%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.90%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.90%
Columbia Select Large Cap Growth Fund - Institutional 3 Class | Semiconductor Materials and Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.30%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.70%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Intuitive Surgical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Adobe, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Eli Lilly & Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.70%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Booking Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.60%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.90%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.90%
Columbia Select Large Cap Growth Fund - Institutional 2 Class | Semiconductor Materials and Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Large Cap Growth Fund - Institutional Class | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.30%
Columbia Select Large Cap Growth Fund - Institutional Class | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Select Large Cap Growth Fund - Institutional Class | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.70%
Columbia Select Large Cap Growth Fund - Institutional Class | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Select Large Cap Growth Fund - Institutional Class | Intuitive Surgical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Select Large Cap Growth Fund - Institutional Class | Adobe, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Select Large Cap Growth Fund - Institutional Class | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Institutional Class | Eli Lilly & Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Institutional Class | Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.70%
Columbia Select Large Cap Growth Fund - Institutional Class | Booking Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Select Large Cap Growth Fund - Institutional Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
Columbia Select Large Cap Growth Fund - Institutional Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.60%
Columbia Select Large Cap Growth Fund - Institutional Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.90%
Columbia Select Large Cap Growth Fund - Institutional Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Select Large Cap Growth Fund - Institutional Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Columbia Select Large Cap Growth Fund - Institutional Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Columbia Select Large Cap Growth Fund - Institutional Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Select Large Cap Growth Fund - Institutional Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Select Large Cap Growth Fund - Institutional Class | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Columbia Select Large Cap Growth Fund - Institutional Class | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Select Large Cap Growth Fund - Institutional Class | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.90%
Columbia Select Large Cap Growth Fund - Institutional Class | Semiconductor Materials and Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Large Cap Growth Fund - Advisor Class | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.30%
Columbia Select Large Cap Growth Fund - Advisor Class | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Select Large Cap Growth Fund - Advisor Class | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.70%
Columbia Select Large Cap Growth Fund - Advisor Class | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Select Large Cap Growth Fund - Advisor Class | Intuitive Surgical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Select Large Cap Growth Fund - Advisor Class | Adobe, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Select Large Cap Growth Fund - Advisor Class | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Advisor Class | Eli Lilly & Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Advisor Class | Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.70%
Columbia Select Large Cap Growth Fund - Advisor Class | Booking Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Select Large Cap Growth Fund - Advisor Class | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
Columbia Select Large Cap Growth Fund - Advisor Class | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.60%
Columbia Select Large Cap Growth Fund - Advisor Class | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.90%
Columbia Select Large Cap Growth Fund - Advisor Class | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Select Large Cap Growth Fund - Advisor Class | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Columbia Select Large Cap Growth Fund - Advisor Class | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Columbia Select Large Cap Growth Fund - Advisor Class | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Select Large Cap Growth Fund - Advisor Class | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Select Large Cap Growth Fund - Advisor Class | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Columbia Select Large Cap Growth Fund - Advisor Class | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Select Large Cap Growth Fund - Advisor Class | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.90%
Columbia Select Large Cap Growth Fund - Advisor Class | Semiconductor Materials and Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%
Columbia Select Large Cap Growth Fund - Class A | NVIDIA Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	9.30%
Columbia Select Large Cap Growth Fund - Class A | Microsoft Corp. [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Columbia Select Large Cap Growth Fund - Class A | Amazon.com, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.70%
Columbia Select Large Cap Growth Fund - Class A | Alphabet, Inc., Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	5%
Columbia Select Large Cap Growth Fund - Class A | Intuitive Surgical, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Columbia Select Large Cap Growth Fund - Class A | Adobe, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.70%
Columbia Select Large Cap Growth Fund - Class A | ServiceNow, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Class A | Eli Lilly & Co. [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Columbia Select Large Cap Growth Fund - Class A | Trade Desk, Inc. (The), Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.70%
Columbia Select Large Cap Growth Fund - Class A | Booking Holdings, Inc. [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.60%
Columbia Select Large Cap Growth Fund - Class A | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	40.60%
Columbia Select Large Cap Growth Fund - Class A | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.60%
Columbia Select Large Cap Growth Fund - Class A | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	14.90%
Columbia Select Large Cap Growth Fund - Class A | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.70%
Columbia Select Large Cap Growth Fund - Class A | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.60%
Columbia Select Large Cap Growth Fund - Class A | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	5.40%
Columbia Select Large Cap Growth Fund - Class A | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.90%
Columbia Select Large Cap Growth Fund - Class A | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Columbia Select Large Cap Growth Fund - Class A | Systems Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	17.80%
Columbia Select Large Cap Growth Fund - Class A | Semiconductors [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.80%
Columbia Select Large Cap Growth Fund - Class A | Application Software [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.90%
Columbia Select Large Cap Growth Fund - Class A | Semiconductor Materials and Equipment [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.10%