Employee Pension Plans - Plan Assets for Defined Benefit Plans (Detail)	May 31, 2022	May 31, 2021
Asset category
Weighted-average asset allocation	100.00%	100.00%
Equity Securities
Asset category
Weighted-average asset allocation	45.00%	48.00%
Fixed-Income Funds
Asset category
Weighted-average asset allocation	39.00%	38.00%
Hedge Funds
Asset category
Weighted-average asset allocation	11.00%	0.00%
Other securities
Asset category
Weighted-average asset allocation	5.00%	14.00%