Shareholder Report, Line Graph (Details) |
6 Months Ended |
|---|---|
Jan. 31, 2026 | |
| C000009521 [Member] | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Davis Research Fund (Class A) — With sales charge |
| Standard & Poor's 500 Index [Member] | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | S&P 500 Index |