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Net Investment and Interest Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Net Investment Income [Line Items] |  |  |
Investment income | $ 154,734 | $ 185,014 | $ 155,541
Less: investment expenses | (8,266) | (8,335) | (7,280)
Net investment and interest income | 146,468 | 176,679 | 148,261
Fixed Maturities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 105,089 | 171,814 | 111,625
Insurance policy loans [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 669 | 869 | 705
Mortgage loans [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 28,599 | 23,854 | 25,850
Short-term, amounts held by ceding reinsurers, net and other investments [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | $ 20,377 | $ 11,523 | $ 17,361

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