Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2026 |
Jul. 31, 2026 |
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| C000017675 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Reaves Infrastructure Fund, Institutional Class Shares | ||||
| Without Sales Load [Member] | C000017675 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 14.26% | 7.04% | 7.68% | ||
| S&P 500 Index (USD) (TR) | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | [1] | S&P 500 Index (USD) (TR) | |||
| Average Annual Return, Percent | 19.56% | 12.86% | 15.08% | ||
| MSCI USA Infrastructure (USD) (TR) | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | [1] | MSCI USA Infrastructure (USD) (TR) | |||
| Average Annual Return, Percent | 6.19% | 9.16% | 7.55% | ||
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