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Net Investment and Interest Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Net Investment Income [Line Items] |  |  |
Investment income | $ 129,970 | $ 142,683 | $ 115,436
Less: investment expenses | (7,032) | (4,854) | (4,502)
Investment income, related party | 0 | 0 | 0
Net investment and interest income | 122,938 | 137,829 | 110,934
Fixed Maturities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 102,021 | 107,434 | 99,348
Real Estate [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 5,769 | 7,304 | 5,538
Insurance policy loans [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 829 | 974 | 1,305
Mortgage loans [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 18,248 | 17,164 | 16,674
Short-term, amounts held by ceding reinsurers, net and other investments [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | $ 3,103 | $ 9,807 | $ (7,429)

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