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BORROWINGS - Schedule of Borrowings Outstanding (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Outstanding Balance | $ 779,875 | $ 645,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (9,022) | (7,356)
Recorded Value | 770,853 | 637,644
Estimated Fair Value | 726,298 | 605,842
Line of Credit | Corporate Credit Facility |  |
Debt Instrument [Line Items] |  |
Recorded Value | 265,000 |
SBA Debentures |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (4,305) | (3,670)
SBA Debentures | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 153,000 | 120,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (4,305) | (3,670)
Recorded Value | 148,695 | 116,330
Estimated Fair Value | 141,638 | 115,836
Corporate Credit Facility | Line of Credit |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 265,000 |
Corporate Credit Facility | Line of Credit | Corporate Credit Facility |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 265,000 | 235,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | 0 | 0
Recorded Value | 265,000 | 235,000
Estimated Fair Value | 265,000 | 235,000
SPV Credit Facility | Line of Credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 0 |
Unamortized Debt Issuance Costs and Debt Discount/Premium | 0 |
Recorded Value | 0 |
Estimated Fair Value | 0 |
January 2026 Notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (612) | (949)
January 2026 Notes | Notes |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 140,000 | 140,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (612) | (949)
Recorded Value | 139,388 | 139,051
Estimated Fair Value | 118,249 | 122,768
October 2026 Notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,923) | (2,737)
October 2026 Notes | Notes |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 150,000 | 150,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,923) | (2,737)
Recorded Value | 148,077 | 147,263
Estimated Fair Value | 127,150 | 132,238
August 2028 Notes |  |
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (2,182) | $ 0
August 2028 Notes | Notes |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 71,875 |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (2,182) |
Recorded Value | 69,693 |
Estimated Fair Value | $ 74,261 |

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