Accumulated Other Comprehensive (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,651,527	$ 2,282,836	$ 2,512,225	$ 2,143,000
Ending Balance	2,717,650	2,362,554	2,717,650	2,362,554
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(465,638)	(456,536)	(461,847)	(465,375)
Current period comprehensive (loss) income	(42,679)	(673)	(43,958)	9,117
Income taxes associated with current period comprehensive (loss) income	353	632	(69)	(319)
Income taxes reclassified into earnings			(2,090)
Ending Balance	(507,964)	(456,577)	(507,964)	(456,577)
Pension And Other Postretirement Benefit Liability Adjustments, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(84,789)	(145,600)	(84,647)	(148,764)
Current period comprehensive (loss) income			(1,521)
Amounts reclassified from accumulated other comprehensive income (loss)	2,968	4,500	4,734	8,622
Income taxes reclassified into earnings	(768)	(1,054)	(1,155)	(2,012)
Ending Balance	(82,589)	(142,154)	(82,589)	(142,154)
Unrealized Gain (Loss) On Derivatives, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	11,405	11,405	11,405	11,405
Ending Balance	11,405	11,405	11,405	11,405
Unrealized Gain (Loss) On Securities, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,568)	(2,458)	(2,201)	(2,201)
Current period comprehensive (loss) income	97	150	896	67
Income taxes associated with current period comprehensive (loss) income	(23)	(16)	(82)	(61)
Amounts reclassified from accumulated other comprehensive income (loss)	(141)	(45)	(265)	(179)
Income taxes reclassified into earnings	20	5	37	10
Ending Balance	(1,615)	(2,364)	(1,615)	(2,364)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(540,590)	(593,189)	(537,290)	(604,935)
Current period comprehensive (loss) income	(42,582)	(523)	(44,583)	9,184
Income taxes associated with current period comprehensive (loss) income	330	616	(151)	(380)
Amounts reclassified from accumulated other comprehensive income (loss)	2,827	4,455	4,469	8,443
Income taxes reclassified into earnings	(748)	(1,049)	(3,208)	(2,002)
Ending Balance	$ (580,763)	$ (589,690)	$ (580,763)	$ (589,690)