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 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2026 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2026 |
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| C000032270 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Sit Large Cap Growth Fund | |||||||||||
| Accumulated Value | $ 10,000 | $ 12,118 | $ 14,170 | $ 15,664 | $ 19,006 | $ 26,822 | $ 21,785 | $ 27,276 | $ 35,520 | $ 39,352 | $ 45,374 | |
| Russell 3000® Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Accumulated Value | 10,000 | 11,851 | 13,602 | 14,824 | 15,792 | 22,767 | 19,610 | 23,327 | 28,721 | 33,114 | 40,672 | |
| Russell 1000® Growth Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Accumulated Value | $ 10,000 | $ 12,042 | $ 14,753 | $ 16,458 | $ 20,290 | $ 28,913 | $ 23,485 | $ 29,851 | $ 39,846 | $ 46,707 | $ 54,976 | |