v3.26.3
BORROWINGS - Schedule of Borrowings Outstanding (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2026
Mar. 31, 2026
Debt Instrument [Line Items]    
Outstanding Balance $ 1,414,000 $ 1,148,000
Unamortized Debt Issuance Costs and Debt Discount/Premium (25,248) (16,775)
Recorded Value 1,384,501 1,131,225
Estimated Fair Value 1,381,448 1,121,773
Adjustments of hedge accounting [1] 4,252  
Interest rate swap    
Debt Instrument [Line Items]    
Adjustments of hedge accounting [1] 4,252  
SBA Debentures    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium (7,336) (5,333)
SBA Debentures | Unsecured Debt    
Debt Instrument [Line Items]    
Outstanding Balance 289,000 223,000
Unamortized Debt Issuance Costs and Debt Discount/Premium (7,336) (5,333)
Recorded Value 281,664 217,667
Estimated Fair Value 267,313 214,238
Corporate Credit Facility | Line of Credit | Corporate Credit Facility    
Debt Instrument [Line Items]    
Outstanding Balance 90,000 245,000
Unamortized Debt Issuance Costs and Debt Discount/Premium 0 0
Recorded Value 90,000 245,000
Estimated Fair Value 90,000 245,000
SPV Credit Facility | Line of Credit | SPV Credit Facility    
Debt Instrument [Line Items]    
Outstanding Balance 105,000 100,000
Unamortized Debt Issuance Costs and Debt Discount/Premium 0 0
Recorded Value 105,000 100,000
Estimated Fair Value 105,000 100,000
2029 Convertible Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium (4,674) (5,413)
2029 Convertible Notes | Convertible Debt    
Debt Instrument [Line Items]    
Outstanding Balance 230,000 230,000
Unamortized Debt Issuance Costs and Debt Discount/Premium (4,674) (5,413)
Recorded Value 225,326 224,587
Estimated Fair Value 241,793 218,150
September 2030 Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium (5,355) (6,029)
September 2030 Notes | Notes    
Debt Instrument [Line Items]    
Outstanding Balance 350,000 350,000
Unamortized Debt Issuance Costs and Debt Discount/Premium (5,355) (6,029)
Recorded Value 344,645 343,971
Estimated Fair Value 329,421 344,385
September 2031 Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs and Debt Discount/Premium (7,883) $ 0
September 2031 Notes | Notes    
Debt Instrument [Line Items]    
Outstanding Balance 350,000  
Unamortized Debt Issuance Costs and Debt Discount/Premium (7,883)  
Recorded Value 337,866  
Estimated Fair Value $ 347,921  
[1] Since the hedging relationship qualifies for the shortcut method, the basis of the hedged item is adjusted through interest expense by an amount exactly equal and offsetting to the change in fair value of the hedged instrument. See Note 6 - Derivative Instruments for more information on the interest rate swap.