Changes Recognized in Other Comprehensive Income, Pension (Detail) - Pension Benefits - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020
U.S. Plans
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Net loss (gain) arising during the year	$ (60,857)	$ 109,409
Amounts recognized as a component of net periodic benefit cost:
Amortization or curtailment recognition of prior service (cost) benefit	(8)	(9)
Amortization or settlement recognition of net (loss)	(30,005)	(18,516)
Total recognized in other comprehensive loss (income)	(90,870)	90,884
Non-U.S. Plans
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Prior service cost		(893)
Net loss (gain) arising during the year	(21,838)	(70)
Effect of exchange rates on amounts included in AOCI	6,465	(922)
Amounts recognized as a component of net periodic benefit cost:
Amortization or curtailment recognition of prior service (cost) benefit	150	36
Amortization or settlement recognition of net (loss)	(2,748)	(2,115)
Total recognized in other comprehensive loss (income)	$ (17,971)	$ (3,964)