Investment Risks - Selected American Shares - Selected American Shares |
Dec. 31, 2025 |
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| Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You may lose money by investing in the Fund. |
| Risk Not Insured Depository Institution [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | An investment in the Fund is not a deposit of the bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
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| Risk Nondiversified Status [Member] | |
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| Risk [Text Block] | Financial Services Risk. Risks of investing in the financial services sector include: (1) systemic risk: factors outside the control of a particular financial institution may adversely affect the ability of the financial institution to operate normally or may impair its financial condition; (2) regulatory actions: financial services companies may suffer setbacks if regulators change the rules under which they operate; (3) changes in interest rates: unstable and/or rising interest rates may have a disproportionate effect on companies in the financial services sector; (4) non-diversified loan portfolios: financial services companies may have concentrated portfolios that make them vulnerable to economic conditions that affect an industry; (5) credit: financial services companies may have exposure to investments or agreements that may lead to losses; and (6) competition: the financial services sector has become increasingly competitive.
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| Stock Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Stock Market Risk. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices, including the possibility of sharp declines.
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| Common Stock Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Common Stock Risk. Common stock represents an ownership position in a company. An adverse event may have a negative impact on a company and could result in a decline in the price of its common stock. Common stock is generally subordinate to an issuer’s other securities, including preferred, convertible, and debt securities.
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| Financial Services Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Financial Services Risk. Risks of investing in the financial services sector include: (1) systemic risk: factors outside the control of a particular financial institution may adversely affect the ability of the financial institution to operate normally or may impair its financial condition; (2) regulatory actions: financial services companies may suffer setbacks if regulators change the rules under which they operate; (3) changes in interest rates: unstable and/or rising interest rates may have a disproportionate effect on companies in the financial services sector; (4) non-diversified loan portfolios: financial services companies may have concentrated portfolios that make them vulnerable to economic conditions that affect an industry; (5) credit: financial services companies may have exposure to investments or agreements that may lead to losses; and (6) competition: the financial services sector has become increasingly competitive.
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| Foreign Country Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Country Risk. Securities of foreign companies (including Depositary Receipts) may be subject to greater risk, as foreign economies may not be as strong or diversified, foreign political systems may not be as stable and foreign financial reporting standards may not be as rigorous as they are in the United States. There may also be less information publicly available regarding the non-U.S. issuers and their securities. These securities may be less liquid (and, in some cases, may be illiquid) and could be harder to value than more liquid securities.
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| Headline Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Headline Risk. The Fund may invest in a company when the company becomes the center of controversy after receiving adverse media attention concerning its operations, long-term prospects, management, or for other reasons. While Davis Advisors researches companies subject to such contingencies, it cannot be correct every time, and the company’s stock may never recover or may become worthless.
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| Large Capitalization Companies Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Large-Capitalization Companies Risk. Companies with $10 billion or more in market capitalization are considered by the Adviser to be large-capitalization companies. Large-capitalization companies generally experience slower rates of growth in earnings per share than do mid- and small-capitalization companies.
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| Manager Risk [Member] | |
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| Risk [Text Block] | Manager Risk. Poor security selection or focus on securities in a particular sector, category, or group of companies may cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective. Even if the Adviser implements the intended investment strategies, the implementation of the strategies may be unsuccessful in achieving the Fund’s investment objective.
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| Depositary Receipts Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Depositary Receipts Risk. Depositary Receipts, consisting of American Depositary Receipts, European Depositary Receipts, and Global Depositary Receipts, are certificates evidencing ownership of shares of a foreign issuer. Depositary Receipts are subject to many of the risks associated with investing directly in foreign securities. Depositary Receipts may trade at a discount, or a premium, to the underlying security and may be less liquid than the underlying securities listed on an exchange.
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| Emerging Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Emerging Market Risk. Securities of issuers in emerging and developing markets may offer special investment opportunities, but present risks relating to political, economic, or regulatory conditions not found in more mature markets, such as government controls on foreign investments, government restrictions on the transfer of securities, and less developed trading markets, exchanges, reporting standards, and legal and accounting systems. These securities may be more volatile and less liquid, which may also make them more difficult to value than securities in countries with developed economies.
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| Fees And Expenses Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Fees and Expenses Risk. The Fund may not earn enough through income and capital appreciation to offset the operating expenses of the Fund. All mutual funds incur operating fees and expenses. Fees and expenses reduce the return that a shareholder may earn by investing in a fund, even when a fund has favorable performance. A low-return environment, or a bear market, increases the risk that a shareholder may lose money.
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| Foreign Currency Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Currency Risk. The change in value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency. For example, when the Fund holds a security that is denominated in a foreign currency, a decline of that foreign currency against the U.S. dollar would generally cause the value of the Fund’s shares to decline.
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| Mid And Small Capitalization Companies Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Mid- and Small-Capitalization Companies Risk. Companies with less than $10 billion in market capitalization are considered by the Adviser to be mid- or small-capitalization companies. Mid- and small-capitalization companies typically have more limited product lines, markets, and financial resources than larger companies and their securities may trade less frequently and in more limited volume than those of larger, more mature companies.
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