Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 1,743,025	$ 1,264,663	$ 1,408,605
Deferred taxes	19,541	27,783	(23,403)
Ending Balance	1,983,828	1,743,025	1,264,663
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(300,365)	(440,732)	(370,495)
Other comprehensive income (loss)	(98,834)	148,360	(71,820)
Deferred taxes	3,726	(7,993)	1,583
Ending Balance	(395,473)	(300,365)	(440,732)
Pension And Other Postretirement Benefit Liability Adjustments, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(190,610)	(277,717)	(211,645)
Other comprehensive income (loss)	49,078	113,984	(86,347)
Deferred taxes	(11,851)	(26,877)	20,275
Ending Balance	(153,383)	(190,610)	(277,717)
Unrealized Gain (Loss) On Derivatives, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(23,982)	(71)	4,379
Other comprehensive income (loss)	48,572	(31,087)	(6,315)
Deferred taxes	(11,419)	7,176	1,865
Ending Balance	13,171	(23,982)	(71)
Unrealized Gain (Loss) On Securities, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	73	1,023	133
Reclassification adjustments for gains (losses) included in net income, net of taxes of $0, $77, $3 in 2020, 2021 and 2022	57	191
Other comprehensive income (loss)	(1,785)	(1,052)	1,210
Deferred taxes	3	(89)	(320)
Ending Balance	(1,652)	73	1,023
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(514,884)	(717,497)	(577,628)
Reclassification adjustments for gains (losses) included in net income, net of taxes of $0, $77, $3 in 2020, 2021 and 2022	57	191
Other comprehensive income (loss)	(2,969)	230,205	(163,272)
Deferred taxes	(19,541)	(27,783)	23,403
Ending Balance	$ (537,337)	$ (514,884)	$ (717,497)