Weighted-Average Assumptions used to Determine Benefit Obligations and Net Periodic Pension Cost (Detail) - Pension Benefits	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Year-End Benefit Obligations, Discount rate	2.75%	2.77%
Year-End Benefit Obligations, Rate of compensation increase	3.19%	3.19%
Net Periodic Pension Cost, Discount rate	2.78%	3.65%	4.12%
Net Periodic Pension Cost, Expected return on plan assets	7.00%	7.40%	7.40%
Net Periodic Pension Cost, Rate of compensation increase	3.19%	3.80%	3.80%
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Year-End Benefit Obligations, Discount rate	2.72%	2.49%
Year-End Benefit Obligations, Rate of compensation increase	2.91%	2.86%
Net Periodic Pension Cost, Discount rate	2.49%	2.61%	3.09%
Net Periodic Pension Cost, Expected return on plan assets	3.30%	3.91%	4.30%
Net Periodic Pension Cost, Rate of compensation increase	2.86%	2.86%	2.85%