v3.26.1
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
C000009596                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Balanced Fund                    
Accumulated Value $ 10,000   $ 11,256 $ 12,364 $ 13,350 $ 14,941 $ 18,898 $ 16,087 $ 18,102 $ 21,869 $ 24,183 $ 27,071
C000009600                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Dividend Growth Fund - Class I                    
Accumulated Value 10,000   11,541 12,737 13,804 14,558 20,109 18,646 21,397 25,400 28,701 34,252
C000033658                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Dividend Growth Fund - Class S                    
Accumulated Value 10,000   11,511 12,669 13,697 14,409 19,865 18,374 21,034 24,903 28,058 33,393
C000069003                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Global Dividend Growth Fund - Class I                    
Accumulated Value 10,000   11,194 11,918 13,012 13,653 18,378 16,299 18,981 22,797 25,898 30,376
C000071096                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Global Dividend Growth Fund - Class S                    
Accumulated Value 10,000   11,167 11,852 12,916 13,511 18,147 16,046 18,634 22,333 25,303 29,600
C000170242                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit ESG Growth Fund - Class I                    
Accumulated Value 10,000   11,313 12,509 13,548 14,425 19,036 15,806 19,215 23,424 27,095 30,934
C000170243                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit ESG Growth Fund - Class S                    
Accumulated Value 10,000   11,279 12,449 13,446 14,283 18,797 15,556 18,865 22,943 26,482 30,159
C000153295                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Small Cap Dividend Growth Fund - Class I                    
Accumulated Value 10,000   11,584 12,511 12,443 12,064 17,871 14,957 17,380 19,875 21,866 29,060
C000153296                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Small Cap Dividend Growth Fund - Class S                    
Accumulated Value 10,000   11,546 12,440 12,341 11,933 17,629 14,724 17,066 19,458 21,355 28,320
C000009598                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Small Cap Growth Fund                    
Accumulated Value 10,000   11,906 13,416 14,281 15,092 22,585 16,810 19,670 21,999 23,011 30,821
C000009595                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit International Growth Fund                    
Accumulated Value 9,057   10,202 10,617 10,994 11,261 15,110 11,573 13,688 14,879 17,694 22,439
C000009597                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Sit Developing Markets Growth Fund                    
Accumulated Value 10,000   12,456 14,317 13,683 13,983 18,429 13,603 14,476 15,710 18,828 27,480
Bloomberg U.S. Aggregate Bond Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   9,969 9,929 10,710 11,646 11,607 10,413 10,315 10,587 11,230 11,656
S&P 500® Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,789 13,484 14,889 16,006 22,536 20,144 24,091 30,007 34,557 42,271
S&P 500® Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,789 13,484 14,889 16,006 22,536 20,144 24,091 30,007 34,557 42,271
MSCI World Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,820 13,130 13,961 14,358 19,964 17,102 20,267 24,360 28,320 34,363
MSCI World Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,820 13,130 13,961 14,358 19,964 17,102 20,267 24,360 28,320 34,363
MSCI World Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,820 13,130 13,961 14,358 19,964 17,102 20,267 24,360 28,320 34,363
MSCI World Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,820 13,130 13,961 14,358 19,964 17,102 20,267 24,360 28,320 34,363
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 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 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
MSCI EAFE Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   12,027 12,850 12,988 12,322 16,308 13,410 15,927 17,765 20,914 25,146
MSCI Emerging Markets Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   12,118 12,822 12,647 11,930 16,481 11,997 11,863 13,023 14,660 20,656
S&P 500® Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   11,789 13,484 14,889 16,006 22,536 20,144 24,091 30,007 34,557 42,271
Russell 2000® Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   12,460 14,649 14,164 13,226 21,429 16,029 18,002 19,812 21,334 30,034
Russell 2000® Index                        
Account Value [Line Items]                        
Accumulated Value 10,000   12,460 14,649 14,164 13,226 21,429 16,029 18,002 19,812 21,334 30,034
Russell 2000® Growth Index                        
Account Value [Line Items]                        
Accumulated Value $ 10,000   $ 12,440 $ 15,160 $ 15,086 $ 15,610 $ 23,628 $ 15,729 $ 18,644 $ 20,347 $ 22,326 $ 30,976