Investment Risks - American Century ETF Trust |
Aug. 05, 2025 |
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| American Century Small Cap Growth Insights ETF | Growth Stocks Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Growth Stocks Risk – Investments in growth stocks may be more volatile than other stocks and the overall stock market. These stocks are typically priced higher than other stocks because of their growth potential, which may or may not be realized. |
| American Century Small Cap Growth Insights ETF | Small-Cap Stock Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Small Cap Stocks Risk – The smaller companies in which the fund invests may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs. |
| American Century Small Cap Growth Insights ETF | Style Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Style Risk – If at any time the market is not favoring the fund’s growth investment style, the fund’s gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles. |
| American Century Small Cap Growth Insights ETF | Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk – The value of the fund’s shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund’s investments. Natural disasters, public health emergencies, war, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally. |
| American Century Small Cap Growth Insights ETF | Market Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Trading Risk – The fund faces numerous market trading risks, including the potential lack of an active market for fund shares, losses investors may face from trading fund shares in secondary markets, periods of high volatility and disruption in the creation and/or redemption process of the fund. Any of these factors, among others, may lead to the fund’s shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than NAV when you buy shares of the fund in the secondary market, and you may receive less (or more) than NAV when you sell those shares in the secondary market. The portfolio managers cannot predict whether shares will trade above (premium), below (discount) or at NAV. |
| American Century Small Cap Growth Insights ETF | Diversification Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Diversification Risk – The fund is classified as diversified pursuant to the Investment Company Act of 1940 (Investment Company Act), with diversification measured at the time of acquisition of investments. Subsequent market fluctuations may cause the fund to exceed such diversification limits and the fund may hold a greater percentage of its assets in a smaller number of securities. To the extent this occurs, a price change in any one of those securities may have a greater impact on the fund's share price and the fund may be more volatile. |
| American Century Small Cap Growth Insights ETF | Active Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Active Management Risk – Due to its active management strategy, the fund could underperform its benchmark index and/or other funds with similar investment objectives and/or strategies. |
| American Century Small Cap Growth Insights ETF | Price Volatility Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Price Volatility Risk – The value of the fund’s shares may fluctuate significantly in the short term. |
| American Century Small Cap Growth Insights ETF | Cash Transactions Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Cash Transactions Risk – The fund may effect its creations and redemptions for cash, rather than for in-kind securities. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in-kind. As such, investments in fund shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind. Cash transactions may have to be carried out over several days if the securities market is relatively illiquid and may involve considerable brokerage fees and taxes. Brokerage fees and taxes will be higher than if the fund sold and redeemed shares in-kind. |
| American Century Small Cap Growth Insights ETF | Authorized Participant Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participant Concentration Risk – Only an authorized participant may engage in creation or redemption transactions directly with the fund. The fund may have a limited number of institutions that act as authorized participants. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other authorized participant is able to step forward to process creation and/or redemption orders, fund shares may trade at a discount to net asset value (NAV) and possibly face trading halts and/or delisting. This risk may be more pronounced in volatile markets, potentially where there are significant redemptions in ETFs generally. |
| American Century Small Cap Growth Insights ETF | Large Shareholder Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large Shareholder Risk – Certain shareholders, including other funds advised by the advisor, may from time to time own a substantial amount of the shares of the fund. In addition, a third party investor, the advisor or an affiliate of the advisor, an authorized participant, a market maker, or another entity may invest in the fund and hold its investment for a limited period of time solely to facilitate commencement of the fund or to facilitate the fund’s achieving a specified size or scale. There can be no assurance that any large shareholder would not redeem its investment, that the size of the fund would be maintained at such levels or that the fund would continue to meet applicable listing requirements. Redemptions by large shareholders could have a significant negative impact on the fund. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the Cboe BZX Exchange, Inc. (Cboe) and may therefore have a material upward or downward effect on the market price of the shares.
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| American Century Small Cap Growth Insights ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Principal Loss Risk – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund. |
| American Century Small Cap Growth Insights ETF | Risk Not Insured Depository Institution [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
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| American Century Small Cap Value Insights ETF | Market Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk – The value of the fund’s shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market. Market risks, including political, regulatory, economic and social developments, can affect the value of the fund’s investments. Natural disasters, public health emergencies, war, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally. |
| American Century Small Cap Value Insights ETF | Market Trading Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Trading Risk – The fund faces numerous market trading risks, including the potential lack of an active market for fund shares, losses investors may face from trading fund shares in secondary markets, periods of high volatility and disruption in the creation and/or redemption process of the fund. Any of these factors, among others, may lead to the fund’s shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than NAV when you buy shares of the fund in the secondary market, and you may receive less (or more) than NAV when you sell those shares in the secondary market. The portfolio managers cannot predict whether shares will trade above (premium), below (discount) or at NAV. |
| American Century Small Cap Value Insights ETF | Diversification Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Diversification Risk – The fund is classified as diversified pursuant to the Investment Company Act of 1940 (Investment Company Act), with diversification measured at the time of acquisition of investments. Subsequent market fluctuations may cause the fund to exceed such diversification limits and the fund may hold a greater percentage of its assets in a smaller number of securities. To the extent this occurs, a price change in any one of those securities may have a greater impact on the fund's share price and the fund may be more volatile. |
| American Century Small Cap Value Insights ETF | Active Management Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Active Management Risk – Due to its active management strategy, the fund could underperform its benchmark index and/or other funds with similar investment objectives and/or strategies. |
| American Century Small Cap Value Insights ETF | Price Volatility Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Price Volatility Risk – The value of the fund’s shares may fluctuate significantly in the short term. |
| American Century Small Cap Value Insights ETF | Cash Transactions Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Cash Transactions Risk – The fund may effect its creations and redemptions for cash, rather than for in-kind securities. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in-kind. As such, investments in fund shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind. Cash transactions may have to be carried out over several days if the securities market is relatively illiquid and may involve considerable brokerage fees and taxes. Brokerage fees and taxes will be higher than if the fund sold and redeemed shares in-kind. |
| American Century Small Cap Value Insights ETF | Authorized Participant Concentration Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Authorized Participant Concentration Risk – Only an authorized participant may engage in creation or redemption transactions directly with the fund. The fund may have a limited number of institutions that act as authorized participants. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other authorized participant is able to step forward to process creation and/or redemption orders, fund shares may trade at a discount to net asset value (NAV) and possibly face trading halts and/or delisting. This risk may be more pronounced in volatile markets, potentially where there are significant redemptions in ETFs generally. |
| American Century Small Cap Value Insights ETF | Large Shareholder Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large Shareholder Risk – Certain shareholders, including other funds advised by the advisor, may from time to time own a substantial amount of the shares of the fund. In addition, a third party investor, the advisor or an affiliate of the advisor, an authorized participant, a market maker, or another entity may invest in the fund and hold its investment for a limited period of time solely to facilitate commencement of the fund or to facilitate the fund’s achieving a specified size or scale. There can be no assurance that any large shareholder would not redeem its investment, that the size of the fund would be maintained at such levels or that the fund would continue to meet applicable listing requirements. Redemptions by large shareholders could have a significant negative impact on the fund. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the Cboe BZX Exchange, Inc. (Cboe) and may therefore have a material upward or downward effect on the market price of the shares. |
| American Century Small Cap Value Insights ETF | Small Cap Stocks Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Small Cap Stocks Risk – The smaller companies in which the fund invests may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs. |
| American Century Small Cap Value Insights ETF | Value Investing Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Value Investing Risk – The determination that a security is undervalued is subjective. If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund’s shares may decline, even if stock prices generally are rising. |
| American Century Small Cap Value Insights ETF | REITs Risk Member | |
| Prospectus [Line Items] | |
| Risk [Text Block] | REITs Risk — Investments in REITs are subject to credit risk and interest rate risk with respect to the loans made by the REITs in which the fund invests. Credit risk is the risk that the borrower will not be able to make interest and principal payments on the loan to the REIT when they are due. Interest rate risk is the risk that a change in the prevailing interest rate will cause the value of the loan portfolio held by the REIT to rise or fall. |
| American Century Small Cap Value Insights ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Principal Loss Risk – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund. |
| American Century Small Cap Value Insights ETF | Risk Not Insured Depository Institution [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
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