Awards and Restricted Stock Units Issued under 2007 Plan and 2014 Omnibus Plan (Detail) - 2007 Plan and 2014 Omnibus Plan - $ / shares	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Weighted-Average Grant-Date Fair Value
Beginning Balance	$ 40.08
Shares granted	81.01	$ 86.93	$ 78.49
Shares forfeited	72.12
Shares exercised	64.03
Ending Balance	$ 41.37	$ 40.08
Shares
Beginning Balance	386,000
Shares granted	23,705
Shares forfeited	(7,000)
Shares exercised	(13,000)
Ending Balance	390,000	386,000