Employee Stock Purchase Plan - Summary of Employee Stock Purchase Plan (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Employee Stock Purchase Plan [Line Items]
Employee contributions	$ 681,000	$ 676,000	$ 564,000
Shares acquired	2,503,570
Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan [Line Items]
Shares acquired	3,178	4,457	3,363
Average purchase price	$ 214.19	$ 151.63	$ 167.71