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BORROWINGS - Schedule of Borrowings Outstanding (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Debt Instrument [Line Items] |  |
Outstanding Balance | $ 743,875 | $ 779,875
Unamortized Debt Issuance Costs and Debt Discount/Premium | (8,434) | (9,022)
Recorded Value | 735,441 | 770,853
Estimated Fair Value | 687,645 | 726,298
Line of Credit | Corporate Credit Facility |  |
Debt Instrument [Line Items] |  |
Recorded Value | 165,000 |
SBA Debentures |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (4,120) | (4,305)
SBA Debentures | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 153,000 | 153,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (4,120) | (4,305)
Recorded Value | 148,880 | 148,695
Estimated Fair Value | 140,290 | 141,638
Corporate Credit Facility | Line of Credit |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 165,000 |
Corporate Credit Facility | Line of Credit | Corporate Credit Facility |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 165,000 | 265,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | 0 | 0
Recorded Value | 165,000 | 265,000
Estimated Fair Value | 165,000 | 265,000
SPV Credit Facility | Line of Credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 64,000 | 0
Unamortized Debt Issuance Costs and Debt Discount/Premium | 0 | 0
Recorded Value | 64,000 | 0
Estimated Fair Value | 64,000 | 0
January 2026 Notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (528) | (612)
January 2026 Notes | Notes |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 140,000 | 140,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (528) | (612)
Recorded Value | 139,472 | 139,388
Estimated Fair Value | 117,213 | 118,249
October 2026 Notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,731) | (1,923)
October 2026 Notes | Notes |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 150,000 | 150,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,731) | (1,923)
Recorded Value | 148,269 | 148,077
Estimated Fair Value | 126,823 | 127,150
August 2028 Notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (2,055) | (2,182)
August 2028 Notes | Notes |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 71,875 | 71,875
Unamortized Debt Issuance Costs and Debt Discount/Premium | (2,055) | (2,182)
Recorded Value | 69,820 | 69,693
Estimated Fair Value | $ 74,319 | $ 74,261

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