Equity Awards - Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Number of Shares, Outstanding Options at Beginning of Year	252,364	436,949	456,849
Number of Shares, Granted	5,476	5,558	56,621
Number of Shares, Exercised	(72,553)	(189,143)	(73,343)
Number of Shares, Cancelled	(1,054)	(1,000)	(3,178)
Number of Shares, Outstanding Options at End of Year	184,233	252,364	436,949
Number of Shares, Options Exercisable at End of Year	162,740	215,913	339,043
Weighted-Average Exercise Price, Outstanding Options at Beginning of Year	$ 91.28	$ 89.69	$ 83.81
Weighted-Average Exercise Price, Granted	244.92	172.62	125.9
Weighted-Average Exercise Price, Exercised	90.2	90.4	80.19
Weighted-Average Exercise Price, Cancelled	125.97	73.37	109.15
Weighted-Average Exercise Price, Outstanding Options at End of Year	95.75	91.28	89.69
Weighted-Average Fair Value of Options Granted During the Year	$ 104.45	$ 69.84	$ 48.36