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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| C000032269 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Sit Mid Cap Growth Fund | |||||||||||
| Accumulated Value | $ 10,000 | $ 11,874 | $ 12,992 | $ 14,520 | $ 15,791 | $ 21,948 | $ 16,526 | $ 20,162 | $ 23,264 | $ 25,990 | $ 31,019 | |
| 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 Midcap® Growth Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Accumulated Value | $ 10,000 | $ 11,705 | $ 13,873 | $ 15,806 | $ 17,689 | $ 25,432 | $ 17,911 | $ 22,054 | $ 25,373 | $ 32,095 | $ 34,075 | |