Changes Recognized in Other Comprehensive Income, Pension (Detail) - Pension Benefits - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019
U.S. Plans
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Prior service cost		$ 11
Net loss (gain) arising during the year	$ 109,409	65,552
Amounts recognized as a component of net periodic benefit cost:
Amortization or curtailment recognition of prior service (cost) benefit	(9)	(118)
Amortization or settlement recognition of net (loss)	(18,516)	(13,087)
Total recognized in other comprehensive loss (income)	90,884	52,358
Non-U.S. Plans
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Prior service cost	(893)	(33)
Net loss (gain) arising during the year	(70)	18,456
Effect of exchange rates on amounts included in AOCI	(922)	(1,593)
Amounts recognized as a component of net periodic benefit cost:
Amortization or curtailment recognition of prior service (cost) benefit	36	30
Amortization or settlement recognition of net (loss)	(2,115)	(1,345)
Total recognized in other comprehensive loss (income)	$ (3,964)	$ 15,515