Summary of Option and Share-Based Payment Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Stock Options And Stock Appreciation Rights
Weighted Average Exercise Price
Beginning balance	$ 59.28
Options granted	86.93
Options exercised	69.71
Ending balance	63.16	$ 59.28
Exercisable at May 31, 2022	$ 55.88
Number of Shares Under Option
Beginning balance	2,005
Options granted	340
Options exercised	(45)
Ending balance	2,300	2,005
Exercisable at May 31, 2022	1,490
SARs
Number of Shares Under Option
Weighted-average grant-date fair value per SAR	$ 16.72	$ 14.38	$ 11.59
Intrinsic value of options exercised	$ 13,770	$ 8,800	$ 9,620
Tax benefit from options exercised	88,000	8,821,000	5,936,000
Fair value of SARS vested	$ 13,490	$ 12,590	$ 12,270