Changes in Benefits Obligations and Plan Assets, Pension (Detail) - Pension Benefits - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2021	May 31, 2021	May 31, 2020	May 31, 2019
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year		$ 762,739	$ 660,277
Service cost		44,520	39,425	$ 37,528
Interest cost		15,223	20,415	21,987
Benefits paid		(64,139)	(41,186)
Actuarial losses/(gains)		63,730	83,808
Benefit Obligation at End of Year		822,073	762,739	660,277
Balance at Beginning of Period		516,550	496,865
Actual return on plan assets		157,702	8,689
Employer contributions	$ 62,300	62,264	52,182
Benefits paid		(64,139)	(41,186)
Balance at End of Period		672,377	516,550	496,865
(Deficit)/Surplus of plan assets versus benefit obligations at end of year		(149,696)	(246,189)
Net Amount Recognized		(149,696)	(246,189)
Accumulated Benefit Obligation		702,315	662,197
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year		210,278	205,967
Service cost		6,355	5,400	4,693
Interest cost		5,308	4,842	5,420
Benefits paid		(9,248)	(6,269)
Participant contributions		1,140	1,106
Plan amendments			(893)
Plan combination			922
Plan settlements/curtailments		(2,342)	(288)
Actuarial losses/(gains)		(7,774)	2,718
Premiums paid		(103)	(99)
Currency exchange rate changes		28,414	(3,128)
Benefit Obligation at End of Year		232,028	210,278	205,967
Balance at Beginning of Period		194,874	187,112
Actual return on plan assets		21,350	9,899
Employer contributions		7,119	6,331
Participant contributions		1,140	1,106
Benefits paid		(9,248)	(6,269)
Plan combination			182
Premiums paid		(103)	(99)
Plan settlements/curtailments		(2,327)	(281)
Currency exchange rate changes		27,048	(3,107)
Balance at End of Period		239,853	194,874	$ 187,112
(Deficit)/Surplus of plan assets versus benefit obligations at end of year		7,825	(15,404)
Net Amount Recognized		7,825	(15,404)
Accumulated Benefit Obligation		$ 217,012	$ 197,167