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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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