Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2025 |
Jun. 30, 2025 |
|
| C000032270 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Sit Large Cap Growth Fund | ||
| Without Sales Load [Member] | C000032270 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 10.79% | 15.67% | 14.58% |
| Russell 3000® Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 15.30% | 15.96% | 12.96% |
| Russell 1000® Growth Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 17.22% | 18.15% | 17.01% |