Employee Retirement Plans - Plan Assets for Defined Benefit Plans (Detail)	May 31, 2025	May 31, 2024
Asset category
Weighted-average asset allocation	100.00%	100.00%
Equity Securities
Asset category
Weighted-average asset allocation	17.00%	30.00%
Fixed-Income Funds
Asset category
Weighted-average asset allocation	69.00%	46.00%
Hedge Funds
Asset category
Weighted-average asset allocation	7.00%	16.00%
Other securities
Asset category
Weighted-average asset allocation	7.00%	8.00%