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Equity Method Investments, Investment in Arbutus (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Investments [Abstract]
Number of shares acquired (in shares)	804,890,910		804,890,910		760,143,393
Aggregate fair value investment	$ 239,927		$ 239,927		$ 304,317
Arbutus Biopharma Corporation [Member]
Investments [Abstract]
Equity method investment ownership percentage	23.00%		23.00%
Aggregate fair value investment	$ 97,100		$ 97,100		$ 117,700
Unrealized gain (losses) on investments	$ 18,300	$ 16,300	$ (20,600)	$ (25,300)
Closing price of common stock (in dollars per share)	$ 2.5		$ 2.5		$ 3.03
Arbutus Biopharma Corporation [Member] | Common Stock [Member]
Investments [Abstract]
Number of shares acquired (in shares)	38,847,462		38,847,462

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