Other Assets - Summary of Components of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Investment in Shockwave Medical	$ 46,385	$ 61,535
Other investments (Note 6)	125,807	70,314
Operating lease right of use assets	7,550	9,518
Other intangible assets and other assets	13,302	6,118
Total other assets	$ 193,044	$ 147,485