Accumulated Other Comprehensive (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,282,836	$ 1,997,602	$ 2,143,000	$ 1,983,828
Ending Balance	2,362,554	2,092,085	2,362,554	2,092,085
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(456,536)	(474,367)	(465,375)	(395,473)
Current period comprehensive income (loss)	(673)	8,579	9,117	(71,936)
Income taxes associated with current period comprehensive (loss) income	632	570	(319)	2,191
Ending Balance	(456,577)	(465,218)	(456,577)	(465,218)
Pension And Other Postretirement Benefit Liability Adjustments, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(145,600)	(149,111)	(148,764)	(153,383)
Amounts reclassified from accumulated other comprehensive income (loss)	4,500	4,623	8,622	10,326
Income taxes reclassified into earnings	(1,054)	(1,074)	(2,012)	(2,505)
Ending Balance	(142,154)	(145,562)	(142,154)	(145,562)
Unrealized Gain (Loss) On Derivatives, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	11,405	12,565	11,405	13,171
Amounts reclassified from accumulated other comprehensive income (loss)		(605)		(1,211)
Ending Balance	11,405	11,960	11,405	11,960
Unrealized Gain (Loss) On Securities, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,458)	(1,992)	(2,201)	(1,652)
Current period comprehensive income (loss)	150	(331)	67	(802)
Income taxes associated with current period comprehensive (loss) income	(16)	117	(61)	211
Amounts reclassified from accumulated other comprehensive income (loss)	(45)	(20)	(179)	22
Income taxes reclassified into earnings	5		10	(5)
Ending Balance	(2,364)	(2,226)	(2,364)	(2,226)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(593,189)	(612,905)	(604,935)	(537,337)
Current period comprehensive income (loss)	(523)	8,248	9,184	(72,738)
Income taxes associated with current period comprehensive (loss) income	616	687	(380)	2,402
Amounts reclassified from accumulated other comprehensive income (loss)	4,455	3,998	8,443	9,137
Income taxes reclassified into earnings	(1,049)	(1,074)	(2,002)	(2,510)
Ending Balance	$ (589,690)	$ (601,046)	$ (589,690)	$ (601,046)