Summary of Components of Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Line Items]
Other investments	$ 62,995	$ 38,741	$ 24,584
Operating lease right-of-use assets (Note 11)	6,109	11,760
Cross-currency swap (Note 5)		3,786
Other intangible assets and other assets	5,323	7,664
Other assets	113,082	117,655
Shockwave Medical
Goodwill [Line Items]
Fair value of investment	$ 38,655	$ 55,704