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, 2022	May 31, 2021	May 31, 2020
Weighted-Average Grant-Date Fair Value
Beginning Balance	$ 37.89
Shares granted	86.93	$ 78.49	$ 62.17
Shares exercised	44.91
Ending Balance	$ 40.08	$ 37.89
Shares
Beginning Balance	418,000
Shares granted	23,869
Shares exercised	(56,000)
Ending Balance	386,000	418,000