Other Assets - Additional Information (Detail) - Shockwave Medical - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Line Items]
Sale of stock			1.4
Cash proceeds from sale of stock			$ 67.9
Total realized gain (loss) from sale of stock			47.3
Other Income (Expense)
Goodwill [Line Items]
Unrealized gain (loss) recorded in other income	$ 4.8	$ 10.8	$ 22.4	$ 34.7