Share-Based Activity under 2003 Plan (Detail) - Directors Equity Incentive Plan 2003 - $ / shares shares in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Weighted Average Grant-Date Fair Value
Beginning balance	$ 71.19
Shares granted to Directors	81.53	$ 87.35	$ 67.26
Shares vested	60.50
Ending balance	$ 77.95	$ 71.19
Shares
Beginning balance	56
Shares granted to directors	18
Shares vested	(18)
Ending balance	56	56