v3.26.1
BORROWINGS - Schedule of Borrowings Outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Mar. 31, 2025
Debt Instrument [Line Items]    
Outstanding Balance $ 1,148,000 $ 969,875
Unamortized Debt Issuance Costs and Debt Discount/Premium (16,775) (13,810)
Recorded Value 1,131,225 956,065
Estimated Fair Value 1,121,773 939,710
SBA Debentures    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium (5,333) (4,082)
SBA Debentures | Unsecured Debt    
Debt Instrument [Line Items]    
Outstanding Balance 223,000 175,000
Unamortized Debt Issuance Costs and Debt Discount/Premium (5,333) (4,082)
Recorded Value 217,667 170,918
Estimated Fair Value 214,238 166,460
Corporate Credit Facility | Line of Credit | Corporate Credit Facility    
Debt Instrument [Line Items]    
Outstanding Balance 245,000 235,000
Unamortized Debt Issuance Costs and Debt Discount/Premium 0 0
Recorded Value 245,000 235,000
Estimated Fair Value 245,000 235,000
SPV Credit Facility | Line of Credit | SPV Credit Facility    
Debt Instrument [Line Items]    
Outstanding Balance 100,000 108,000
Unamortized Debt Issuance Costs and Debt Discount/Premium 0 0
Recorded Value 100,000 108,000
Estimated Fair Value 100,000 108,000
October 2026 Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium 0 (1,154)
October 2026 Notes | Notes    
Debt Instrument [Line Items]    
Outstanding Balance   150,000
Unamortized Debt Issuance Costs and Debt Discount/Premium   (1,154)
Recorded Value   148,846
Estimated Fair Value   130,899
August 2028 Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium 0 (1,681)
August 2028 Notes | Notes    
Debt Instrument [Line Items]    
Outstanding Balance   71,875
Unamortized Debt Issuance Costs and Debt Discount/Premium   (1,681)
Recorded Value   70,194
Estimated Fair Value   73,571
2029 Convertible Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium (5,413) (6,893)
2029 Convertible Notes | Convertible Debt    
Debt Instrument [Line Items]    
Outstanding Balance 230,000 230,000
Unamortized Debt Issuance Costs and Debt Discount/Premium (5,413) (6,893)
Recorded Value 224,587 223,107
Estimated Fair Value 218,150 225,780
September 2030 Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium (6,029) $ 0
September 2030 Notes | Notes    
Debt Instrument [Line Items]    
Outstanding Balance 350,000  
Unamortized Debt Issuance Costs and Debt Discount/Premium (6,029)  
Recorded Value 343,971  
Estimated Fair Value $ 344,385