Employee Pension Plans - Plan Assets for Defined Benefit Plans (Detail)	May 31, 2023	May 31, 2022
Asset category
Weighted-average asset allocation	100.00%	100.00%
Equity Securities
Asset category
Weighted-average asset allocation	27.00%	45.00%
Fixed-Income Funds
Asset category
Weighted-average asset allocation	41.00%	39.00%
Hedge Funds
Asset category
Weighted-average asset allocation	12.00%	11.00%
Other securities
Asset category
Weighted-average asset allocation	19.00%	5.00%