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BORROWINGS - Borrowings Outstanding (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | $ 934,875 |  | $ 934,875 |  | $ 779,875
Unamortized Debt Issuance Costs and Debt Discount/Premium | (14,681) |  | (14,681) |  | (9,022)
Recorded Value | 920,194 |  | 920,194 |  | 770,853
Estimated Fair Value | 895,869 |  | 895,869 |  | 726,298
Line of Credit | Corporate Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Recorded Value | 190,000 |  | 190,000 |  |
SBA Debentures |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (4,279) |  | (4,279) |  | (4,305)
SBA Debentures | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 175,000 |  | 175,000 |  | 153,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (4,279) |  | (4,279) |  | (4,305)
Recorded Value | 170,721 |  | 170,721 |  | 148,695
Estimated Fair Value | 161,364 |  | 161,364 |  | 141,638
Corporate Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 190,000 |  | 190,000 |  |
Corporate Credit Facility | Line of Credit | Corporate Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 190,000 |  | 190,000 |  | 265,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | 0 |  | 0 |  | 0
Recorded Value | 190,000 |  | 190,000 |  | 265,000
Estimated Fair Value | 190,000 |  | 190,000 |  | 265,000
SPV Credit Facility | Line of Credit | SPV Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 118,000 |  | 118,000 |  | 0
Unamortized Debt Issuance Costs and Debt Discount/Premium | 0 |  | 0 |  | 0
Recorded Value | 118,000 |  | 118,000 |  | 0
Estimated Fair Value | 118,000 |  | 118,000 |  | 0
January 2026 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | 0 |  | 0 |  | (612)
January 2026 Notes | Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance |  |  |  |  | 140,000
Unamortized Debt Issuance Costs and Debt Discount/Premium |  |  |  |  | (612)
Recorded Value |  |  |  |  | 139,388
Estimated Fair Value |  |  |  |  | 118,249
Interest expense | 1,208 | $ 1,575 | 4,358 | $ 4,725 |
October 2026 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,346) |  | (1,346) |  | (1,923)
October 2026 Notes | Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 150,000 |  | 150,000 |  | 150,000
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,346) |  | (1,346) |  | (1,923)
Recorded Value | 148,654 |  | 148,654 |  | 148,077
Estimated Fair Value | 129,411 |  | 129,411 |  | 127,150
Interest expense | 1,266 | 1,266 | 3,797 | 3,797 |
August 2028 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,800) |  | (1,800) |  | (2,182)
August 2028 Notes | Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 71,875 |  | 71,875 |  | 71,875
Unamortized Debt Issuance Costs and Debt Discount/Premium | (1,800) |  | (1,800) |  | (2,182)
Recorded Value | 70,075 |  | 70,075 |  | 69,693
Estimated Fair Value | 74,118 |  | 74,118 |  | 74,261
Interest expense | 1,393 | 1,393 | 4,178 | 3,033 |
2029 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (7,256) |  | (7,256) |  | $ 0
2029 Convertible Notes | Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 230,000 |  | 230,000 |  |
2029 Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Balance | 230,000 |  | 230,000 |  |
Unamortized Debt Issuance Costs and Debt Discount/Premium | (7,256) |  | (7,256) |  |
Recorded Value | 222,744 |  | 222,744 |  |
Estimated Fair Value | 222,976 |  | 222,976 |  |
Interest expense | $ 1,703 | $ 0 | $ 1,703 | $ 0 |

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