Other Assets - Additional Information (Detail) - Shockwave Medical - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Line Items]
Investment in affiliate			$ 25,000
Fair value of investment	$ 38,655	$ 55,704
Sale of stock	1.4
Cash proceeds from sale of stock	$ 67,900
Total realized gain (loss) from sale of stock	$ 47,300
Investments In And Advances To Affiliates Balance Shares	0.3
Other Income (Expense)
Goodwill [Line Items]
Gain (loss) recorded in other income (expense)	$ 50,800	$ 500