MSC Income Fund Quarterly report [Sections 13 or 15(d)]

DEBT - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Debt Instrument [Line Items]
Total Interest Expense	$ 8,920	$ 8,243
Main Street Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Interest Expense	63
October 2026 Notes \| Unsecured Debt
Debt Instrument [Line Items]
Total Interest Expense	1,590	1,590
May 2029 Notes \| Unsecured Debt
Debt Instrument [Line Items]
Total Interest Expense	487	0
Revolving Credit Facility \| SPV Facility \| Line of Credit
Debt Instrument [Line Items]
Total Interest Expense	3,937	4,796
Revolving Credit Facility \| Corporate Facility \| Line of Credit
Debt Instrument [Line Items]
Total Interest Expense	$ 2,843	1,857
Revolving Credit Facility \| Main Street Facility
Debt Instrument [Line Items]
Total Interest Expense		$ 0