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Performance Management - American Century ETF Trust
May 05, 2026
Avantis U.S. Core Equity ETF  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Fund Performance
Performance Narrative [Text Block]
The fund’s performance history is not available as of the date of this prospectus. When the fund has investment results for a full calendar year, this section will feature charts that show annual total returns, highest and lowest quarterly returns and average annual total returns for the fund. This information indicates the volatility of the fund’s historical returns from year to year. For current performance information, please visit avantisinvestors.com.
Performance information is designed to help you see how fund returns can vary. Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.
Performance Past Does Not Indicate Future [Text] Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] Performance information is designed to help you see how fund returns can vary.
Performance One Year or Less [Text] The fund’s performance history is not available as of the date of this prospectus. When the fund has investment results for a full calendar year, this section will feature charts that show annual total returns, highest and lowest quarterly returns and average annual total returns for the fund.
Performance Availability Website Address [Text] avantisinvestors.com
American Century Core Plus Income ETF  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Fund Performance
Performance Narrative [Text Block]
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund’s performance from year to year. The table shows how the fund’s average annual returns for the periods shown compared with those of a broad measure of market performance. The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.
Performance Past Does Not Indicate Future [Text] The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund’s performance from year to year. The table shows how the fund’s average annual returns for the periods shown compared with those of a broad measure of market performance.
Bar Chart Does Not Reflect Sales Loads [Text] Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.
Bar Chart [Heading] Calendar Year Total Returns
Bar Chart Closing [Text Block]
Highest Performance Quarter (4Q 2023): 6.58% Lowest Performance Quarter (2Q 2022): -5.20%
As of September 30, 2025, the most recent calendar quarter end, the fund’s year-to-date return was 6.78%.
Performance Table Heading Average Annual Total Returns For the calendar year ended December 31, 2024
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.
Performance Availability Website Address [Text] americancentury.com
American Century Core Plus Income ETF | American Century Core Plus Income ETF Class  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] year-to-date return
Bar Chart, Year to Date Return 6.78%
Bar Chart, Year to Date Return, Date Sep. 30, 2025
Highest Quarterly Return, Label [Optional Text] Highest Performance Quarter
Highest Quarterly Return 6.58%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Lowest Performance Quarter
Lowest Quarterly Return (5.20%)
Lowest Quarterly Return, Date Jun. 30, 2022