Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2015 |
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| C000032270 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Sit Large Cap Growth Fund | ||||||||||
| Account Value | $ 39,002 | $ 35,205 | $ 27,034 | $ 21,592 | $ 26,584 | $ 18,838 | $ 15,525 | $ 14,044 | $ 12,011 | $ 9,911 | $ 10,000 |
| Russell 3000® Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | 33,822 | 29,335 | 23,825 | 20,029 | 23,253 | 16,130 | 15,141 | 13,893 | 12,104 | 10,214 | 10,000 |
| Russell 1000® Growth Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Account Value | $ 48,119 | $ 41,051 | $ 30,754 | $ 24,195 | $ 29,787 | $ 20,904 | $ 16,956 | $ 15,199 | $ 12,406 | $ 10,302 | $ 10,000 |