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Shareholder Report
 6 Months Ended
Jun. 30, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Wanger Advisors Trust
Entity Central Index Key 0000929521
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2024
Wanger Acorn  
Shareholder Report [Line Items]  
Fund Name Wanger Acorn
Class Name Wanger Acorn
Trading Symbol WUSAX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Wanger Acorn (the Fund) for the period of January 1, 2024 to June 30, 2024.
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)
FundCosts of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Wanger Acorn$480.95%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.95%
Net Assets $ 505,578,805
Holdings Count | Holding 103
Investment Company, Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund
net assets
$
505,578,805
Total number of portfolio holdings
103
Portfolio tur
nov
er for the re
porti
ng period 		41%
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
Churchill Downs, Inc.3.0%
SPX Technologies, Inc.2.4%
Bio-Techne Corp.2.4%
Five Below, Inc.2.3%
BJ's Wholesale Club Holdings, Inc.2.1%
Parsons Corp.2.1%
Natera, Inc.2.0%
Colliers International Group, Inc.2.0%
Ryan Specialty Holdings, Inc., Class A2.0%
WillScot Mobile Mini Holdings Corp.1.9%
Asset Categories
Graphical Representation - Allocation 1 Chart
Equity Sector Allocation
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
Top Holdings
Churchill Downs, Inc.3.0%
SPX Technologies, Inc.2.4%
Bio-Techne Corp.2.4%
Five Below, Inc.2.3%
BJ's Wholesale Club Holdings, Inc.2.1%
Parsons Corp.2.1%
Natera, Inc.2.0%
Colliers International Group, Inc.2.0%
Ryan Specialty Holdings, Inc., Class A2.0%
WillScot Mobile Mini Holdings Corp.1.9%