Investment Risks - PRIMECAP Odyssey Discovery ETF	Jun. 20, 2026
Stock Market Risk Member
Prospectus [Line Items]
Risk [Text Block]	Stock market risk. The chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.
Manager Risk Member
Prospectus [Line Items]
Risk [Text Block]	Manager risk. The chance that, as a result of poor security selection by the Advisor, the Fund may underperform relative to its benchmarks or other funds with similar investment objectives.
Investment Style Risk Member
Prospectus [Line Items]
Risk [Text Block]	Investment style risk. The chance that returns from the mix of mid-cap stocks in the Fund’s portfolio will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall stock market, and they often perform quite differently. Additionally, from time to time, growth stocks may be more volatile than the overall stock market.
Sector-Focus Risk Member
Prospectus [Line Items]
Risk [Text Block]	Sector-focus risk. Investing a significant portion of the Fund’s assets in one sector of the market exposes the Fund to greater market risk and potential monetary losses than if those assets were spread among various sectors. If the Fund’s portfolio is overweighted in a certain sector, any negative development affecting that sector will have a greater impact on the Fund than a fund that is not overweighted in that sector.
Asset Concentration Risk Member
Prospectus [Line Items]
Risk [Text Block]	Asset concentration risk. The chance that, because the Fund may invest a high percentage of its assets in its largest holdings, the Fund's performance may be hurt disproportionately by the poor performance of relatively few stocks.
Issuer Risk Member
Prospectus [Line Items]
Risk [Text Block]	Issuer risk. Issuer-specific attributes may cause a security held by the Fund to be more volatile than the market generally. An individual security may also be affected by factors related to the industry or sector of the issuer or the securities markets as a whole, and conversely an industry or sector or the securities markets may be affected by a change in financial condition or another event affecting a single issuer.
Small- And Mid-Cap Stocks Risk Member
Prospectus [Line Items]
Risk [Text Block]	Small- and mid-cap stocks risk. The chance that small- and mid-cap stocks may trade less frequently or in more limited volume than those of larger, more established companies; may fluctuate in value more; and, as a group, may suffer more severe price declines during periods of generally declining stock prices.
Growth Stocks Risk Member
Prospectus [Line Items]
Risk [Text Block]	Growth stocks risk. The chance that returns from growth stocks in the Fund’s portfolio will trail returns from the overall stock market. Growth stocks are likely to be more volatile in price than the stock market as a whole. Historically, growth funds have tended to outperform the market as a whole in rising markets and underperform the market as a whole in declining markets. Of course, there is no guarantee that this pattern will continue in the future.
Foreign Securities Risk Member
Prospectus [Line Items]
Risk [Text Block]	Foreign securities risk. The chance that the value of foreign securities will be adversely affected by the political and economic environments and other overall economic conditions in the countries where the Fund invests. Investing in foreign securities involves: country risk, which is the chance that domestic events – such as political upheaval, financial troubles, corruption, or natural disasters – will weaken a country’s securities markets; and currency risk, which is the chance that the value of a foreign investment, measured in U.S. dollars, will decrease because of unfavorable changes in currency exchange rates. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms.
U.S. Administration Foreign Policy And Government Restructuring Risk Member
Prospectus [Line Items]
Risk [Text Block]	U.S. Administration Foreign Policy and Government Restructuring Risk. Since the change in the U.S. presidential administration in 2025, the administration has pursued an aggressive foreign policy agenda, including through suggestions that the United States should control certain sovereign foreign territories, attempts to restructure federal government agencies with international influence, and the imposition of tariffs and trade barriers on certain foreign countries, including China and long-time U.S. allies. These and other similar actions may have unforeseen consequences on the economy and markets generally, and could negatively impact the Fund.
Exchange-Traded Fund (“ETF”) Risks Member
Prospectus [Line Items]
Risk [Text Block]	Exchange-Traded Fund (“ETF”) Risks. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent that (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform such functions, Fund shares may trade at a material discount to net asset value (“NAV”), the bid-ask spread could widen, and shares could face trading halts and/or delisting. Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Fund shares may significantly reduce investment results and an investment in shares may not be advisable for investors who anticipate regularly making small investments. Shares May Trade at Prices Other Than NAV. As with all ETFs, Fund shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Fund shares will approximate the Fund’s NAV, there may be times when the market price of Fund shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Fund shares or during periods of market volatility. If an investor buys Fund shares when the shares’ market price is at a premium, the investor may pay more than the shares’ underlying value. If an investor sells Fund shares when the shares’ market price is at a discount, the investor may receive less than the shares’ underlying value. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Fund shares in the secondary market, in which case such premiums or discounts may be significant. Trading. Although Fund shares are listed for trading on the NYSE Arca (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active trading market will be maintained for Fund shares or that Fund shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Fund shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Fund shares and could lead to differences between the market price of the Fund’s shares and the underlying value of those shares. These conditions could cause the Fund’s shares to trade at a material discount to NAV and the bid-ask spread to widen.
Exchange-Traded Fund (“ETF”) Risks, Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk Member
Prospectus [Line Items]
Risk [Text Block]	Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent that (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform such functions, Fund shares may trade at a material discount to net asset value (“NAV”), the bid-ask spread could widen, and shares could face trading halts and/or delisting.
Exchange-Traded Fund (“ETF”) Risks, Costs Of Buying Or Selling Shares Risk Member
Prospectus [Line Items]
Risk [Text Block]	Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Fund shares may significantly reduce investment results and an investment in shares may not be advisable for investors who anticipate regularly making small investments.
Exchange-Traded Fund (“ETF”) Risks, Shares May Trade At Prices Other Than NAV Risk Member
Prospectus [Line Items]
Risk [Text Block]	Shares May Trade at Prices Other Than NAV. As with all ETFs, Fund shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Fund shares will approximate the Fund’s NAV, there may be times when the market price of Fund shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Fund shares or during periods of market volatility. If an investor buys Fund shares when the shares’ market price is at a premium, the investor may pay more than the shares’ underlying value. If an investor sells Fund shares when the shares’ market price is at a discount, the investor may receive less than the shares’ underlying value. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Fund shares in the secondary market, in which case such premiums or discounts may be significant.
Exchange-Traded Fund (“ETF”) Risks, Trading Risk Member
Prospectus [Line Items]
Risk [Text Block]	Trading. Although Fund shares are listed for trading on the NYSE Arca (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active trading market will be maintained for Fund shares or that Fund shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Fund shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Fund shares and could lead to differences between the market price of the Fund’s shares and the underlying value of those shares. These conditions could cause the Fund’s shares to trade at a material discount to NAV and the bid-ask spread to widen.
Limited Operating History Risk Member
Prospectus [Line Items]
Risk [Text Block]	Limited Operating History Risk. The Fund is recently organized and has a limited operating history. As a result, prospective investors have a limited track record or history on which to base their investment decision. There can be no assurance that the Fund will grow to or maintain an economically viable size.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.
Risk Not Insured Depository Institution [Member]
Prospectus [Line Items]
Risk [Text Block]	An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any government agency.
Risk Nondiversified Status [Member]
Prospectus [Line Items]
Risk [Text Block]	Non-Diversification Risk. The Fund is non-diversified, which means that it may invest more of its assets in the securities of a single issuer or a smaller number of issuers than if it were a diversified fund. As a result, the Fund may be more exposed to the risks associated with and developments affecting an individual issuer or a smaller number of issuers than a fund that invests in a greater number of issuers. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance. However, the Fund intends to satisfy the diversification requirements for qualifying as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”).

Investment Risks - PRIMECAP Odyssey Discovery ETF

Jun. 20, 2026

Stock market risk. The chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.

Prospectus [Line Items]

Risk [Text Block]

Manager risk. The chance that, as a result of poor security selection by the Advisor, the Fund may underperform relative to its benchmarks or other funds with similar investment objectives.

Investment Style Risk Member

Prospectus [Line Items]

Risk [Text Block]

Investment style risk. The chance that returns from the mix of mid-cap stocks in the Fund’s portfolio will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall stock market, and they often perform quite differently. Additionally, from time to time, growth stocks may be more volatile than the overall stock market.

Sector-Focus Risk Member

Prospectus [Line Items]

Risk [Text Block]

Sector-focus risk. Investing a significant portion of the Fund’s assets in one sector of the market exposes the Fund to greater market risk and potential monetary losses than if those assets were spread among various sectors. If the Fund’s portfolio is overweighted in a certain sector, any negative development affecting that sector will have a greater impact on the Fund than a fund that is not overweighted in that sector.

Asset Concentration Risk Member

Prospectus [Line Items]

Risk [Text Block]

Asset concentration risk. The chance that, because the Fund may invest a high percentage of its assets in its largest holdings, the Fund's performance may be hurt disproportionately by the poor performance of relatively few stocks.

Issuer Risk Member

Prospectus [Line Items]

Risk [Text Block]

Issuer risk. Issuer-specific attributes may cause a security held by the Fund to be more volatile than the market generally. An individual security may also be affected by factors related to the industry or sector of the issuer or the securities markets as a whole, and conversely an industry or sector or the securities markets may be affected by a change in financial condition or another event affecting a single issuer.

Small- And Mid-Cap Stocks Risk Member

Prospectus [Line Items]

Risk [Text Block]

Small- and mid-cap stocks risk. The chance that small- and mid-cap stocks may trade less frequently or in more limited volume than those of larger, more established companies; may fluctuate in value more; and, as a group, may suffer more severe price declines during periods of generally declining stock prices.

Growth Stocks Risk Member

Prospectus [Line Items]

Risk [Text Block]

Growth stocks risk. The chance that returns from growth stocks in the Fund’s portfolio will trail returns from the overall stock market. Growth stocks are likely to be more volatile in price than the stock market as a whole. Historically, growth funds have tended to outperform the market as a whole in rising markets and underperform the market as a whole in declining markets. Of course, there is no guarantee that this pattern will continue in the future.

Foreign Securities Risk Member

Prospectus [Line Items]

Risk [Text Block]

Foreign securities risk. The chance that the value of foreign securities will be adversely affected by the political and economic environments and other overall economic conditions in the countries where

the Fund invests. Investing in foreign securities involves: country risk, which is the chance that domestic events – such as political upheaval, financial troubles, corruption, or natural disasters – will weaken a country’s securities markets; and currency risk, which is the chance that the value of a foreign investment, measured in U.S. dollars, will decrease because of unfavorable changes in currency exchange rates. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms.

U.S. Administration Foreign Policy And Government Restructuring Risk Member

Prospectus [Line Items]

Risk [Text Block]

U.S. Administration Foreign Policy and Government Restructuring Risk. Since the change in the U.S. presidential administration in 2025, the administration has pursued an aggressive foreign policy agenda, including through suggestions that the United States should control certain sovereign foreign territories, attempts to restructure federal government agencies with international influence, and the imposition of tariffs and trade barriers on certain foreign countries, including China and long-time U.S. allies. These and other similar actions may have unforeseen consequences on the economy and markets generally, and could negatively impact the Fund.

Exchange-Traded Fund (“ETF”) Risks Member

Prospectus [Line Items]

Risk [Text Block]

Exchange-Traded Fund (“ETF”) Risks.

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent that (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform such functions, Fund shares may trade at a material discount to net asset value (“NAV”), the bid-ask spread could widen, and shares could face trading halts and/or delisting.

Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Fund shares may significantly reduce investment results and an investment in shares may not be advisable for investors who anticipate regularly making small investments.

Shares May Trade at Prices Other Than NAV. As with all ETFs, Fund shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Fund shares will approximate the Fund’s NAV, there may be times when the market price of Fund shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Fund shares or during periods of market volatility. If an investor buys Fund shares when the shares’ market price is at a premium, the investor may pay more than the shares’ underlying value. If an investor sells Fund shares when the shares’ market price is at a discount, the investor may receive less than the shares’ underlying value. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Fund shares in the secondary market, in which case such premiums or discounts may be significant.

Trading. Although Fund shares are listed for trading on the NYSE Arca (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that an active trading market will be maintained for Fund shares or that Fund shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Fund shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Fund shares and could lead to differences between the market price of the Fund’s shares and the underlying value of those shares. These conditions could cause the Fund’s shares to trade at a material discount to NAV and the bid-ask spread to widen.

Exchange-Traded Fund (“ETF”) Risks, Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk Member

Prospectus [Line Items]

Risk [Text Block]

Exchange-Traded Fund (“ETF”) Risks, Costs Of Buying Or Selling Shares Risk Member

Prospectus [Line Items]

Risk [Text Block]

Exchange-Traded Fund (“ETF”) Risks, Shares May Trade At Prices Other Than NAV Risk Member

Prospectus [Line Items]

Risk [Text Block]

Exchange-Traded Fund (“ETF”) Risks, Trading Risk Member

Prospectus [Line Items]

Risk [Text Block]

Limited Operating History Risk Member

Prospectus [Line Items]

Risk [Text Block]

Limited Operating History Risk. The Fund is recently organized and has a limited operating history. As a result, prospective investors have a limited track record or history on which to base their investment decision. There can be no assurance that the Fund will grow to or maintain an economically viable size.

Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.

Risk Not Insured Depository Institution [Member]

Prospectus [Line Items]

Risk [Text Block]

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any government agency.

Risk Nondiversified Status [Member]

Prospectus [Line Items]

Risk [Text Block]

Non-Diversification Risk. The Fund is non-diversified, which means that it may invest more of its assets in the securities of a single issuer or a smaller number of issuers than if it were a diversified fund. As a result, the Fund may be more exposed to the risks associated with and developments affecting an individual issuer or a smaller number of issuers than a fund that invests in a greater number of issuers. This may increase the Fund’s volatility and cause the performance of a relatively smaller number of issuers to have a greater impact on the Fund’s performance. However, the Fund intends to satisfy the diversification requirements for qualifying as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”).