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Investments - Summarized Financial Information of Equity Method Investment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Assets |  |  |
Investments | $ 17,577,766 | $ 13,473,255 |
Other assets | 415,221 | 349,425 |
Total assets | 17,992,987 | 13,822,680 |
Liabilities and Partners’ Capital |  |  |
Debt | 61,114 | 84,530 |
Other liabilities | 107,600 | 57,772 |
Total liabilities | 168,714 | 142,302 |
Partners’ capital | 17,824,273 | 13,680,378 |
Total liabilities and partners’ capital | 17,992,987 | 13,822,680 |
Net Income |  |  |
Investment income | 300,121 | 211,797 | $ 233,255
Expenses | 185,769 | 149,598 | 130,771
Net investment income (loss) | 114,352 | 62,199 | 102,484
Net realized and unrealized gain | 1,830,599 | 618,047 | 1,647,977
Net income | $ 1,944,951 | $ 680,246 | $ 1,750,461

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