v3.26.3
RELATED PARTY TRANSACTIONS - Summarizes of Main Street’s Purchases of Shares (Details) - MSC Income - Related Party
$ / shares in Units, $ in Thousands
 1 Months Ended
Sep. 30, 2026
USD ($)
$ / shares
shares
Related Party Transaction [Line Items]  
Total number of shares purchased (in shares) | shares 53,777
Average price paid per share (in dollars per share) | $ / shares $ 12.47
Total Cost | $ $ 670
Total number of shares purchased as part of publicly announced plans or programs (in shares) | shares 53,777
Approximate dollar value of shares that may yet be purchased under the plans or programs | $ $ 17,345