v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name CALAMOS ADVISORS TRUST/IL
Entity Central Index Key 0001079575
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000017621  
Shareholder Report [Line Items]  
Fund Name Calamos Growth and Income Portfolio
Class Name Class I
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Calamos Growth and Income Portfolio for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at www.calamos.com/resources. You can also request this information by contacting us at 800-582-6959.
Additional Information Phone Number 800-582-6959
Additional Information Website www.calamos.com/resources
Expenses [Text Block]

WHAT WERE THE PORTFOLIO COSTS FOR THE LAST SIX MONTHS?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 Investment
Costs Paid as a Percentage of a $10,000 Investment
Class I
$64
1.23%Footnote Reference(1)
FootnoteDescription
Footnote(1)
Annualized.
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.23% [1]
AssetsNet $ 36,086,675
Holdings Count | Holding 153
InvestmentCompanyPortfolioTurnover 20.00%
Additional Fund Statistics [Text Block]

KEY PORTFOLIO STATISTICS

Table Summary
Total Net Assets
# of Portfolio Holdings
Portfolio Turnover Rate
$36,086,675
153
20%
Holdings [Text Block]
Table Summary
SECTOR WEIGHTINGS
% OF NET ASSETS
Information Technology
35.9
Communication Services
10.6
Financials
10.6
Industrials
10.3
Consumer Discretionary
8.7
Health Care
8.6
Consumer Staples
3.5
Utilities
3.0
Energy
2.8
Materials
2.6
Real Estate
1.1
Other
0.9
Largest Holdings [Text Block]

TOP 10 HOLDINGS 

% OF NET ASSETS 

Table Summary
NVIDIA Corp.
6.3
Apple, Inc.
5.8
Alphabet, Inc. - Class A
5.3
Amazon.com, Inc.
3.8
Microsoft Corp.
3.6
Broadcom, Inc.
2.4
Micron Technology, Inc.
1.9
Meta Platforms, Inc. - Class A
1.7
JPMorgan Chase & Co.
1.6
Tesla, Inc.
1.6
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-582-6959.
Updated Prospectus Web Address www.calamos.com/resources
[1] Annualized.