Shareholder Report, Average Annual Return (Details) |
6 Months Ended | 12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|---|
Jan. 31, 2026 |
Jan. 31, 2026 |
Jan. 31, 2026 |
Jan. 31, 2026 |
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| C000009521 [Member] | ||||||
| Average Annual Return [Line Items] | ||||||
| Line Graph and Table Measure Name | Davis Research Fund (Class A) — With sales charge | |||||
| Average Annual Return, Percent | [1] | 16.16% | 10.93% | 13.43% | ||
| Without Sales Load [Member] | C000009521 [Member] | ||||||
| Average Annual Return [Line Items] | ||||||
| Line Graph and Table Measure Name | Davis Research Fund (Class A) — Without sales charge | |||||
| Average Annual Return, Percent | 21.95% | 12.02% | 13.98% | |||
| Standard & Poor's 500 Index [Member] | ||||||
| Average Annual Return [Line Items] | ||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||
| Average Annual Return, Percent | 16.35% | 14.98% | 15.56% | |||
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