Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | ||||
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Jul. 31, 2016 |
Jul. 31, 2026 |
Jul. 31, 2017 |
Jul. 31, 2018 |
Jul. 31, 2019 |
Jul. 31, 2020 |
Jul. 31, 2021 |
Jul. 31, 2022 |
Jul. 31, 2023 |
Jul. 31, 2024 |
Jul. 31, 2025 |
Jul. 31, 2026 |
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| C000017675 | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Reaves Infrastructure Fund, Institutional Class Shares | |||||||||||||
| Accumulated Value | $ 10,000 | $ 10,751 | $ 11,207 | $ 12,637 | $ 12,873 | $ 14,907 | $ 14,011 | $ 13,245 | $ 14,581 | $ 18,335 | $ 20,950 | |||
| S&P 500 Index (USD) (TR) | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | [1] | S&P 500 Index (USD) (TR) | ||||||||||||
| Accumulated Value | 10,000 | 11,604 | 13,489 | 14,566 | 16,308 | 22,251 | 21,219 | 23,980 | 29,292 | 34,076 | 40,742 | |||
| MSCI USA Infrastructure (USD) (TR) | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | [1] | MSCI USA Infrastructure (USD) (TR) | ||||||||||||
| Accumulated Value | $ 10,000 | $ 10,127 | $ 10,310 | $ 11,670 | $ 11,750 | $ 13,362 | $ 14,376 | $ 13,426 | $ 16,131 | $ 19,505 | $ 20,711 | |||
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