Changes in Equity - Summary of Changes in Equity by Component and in Total (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2022	Aug. 31, 2022	Nov. 30, 2023	Nov. 30, 2022
Balance	$ 1,901,916	$ 1,821,628	$ 1,646,972	$ 1,613,962	$ 1,821,628	$ 1,613,962
Net earnings	28,167	99,703	19,505	65,244	127,870	84,749
Other comprehensive (loss) income	14,446	(5,408)	(3,224)	(20,462)	9,038	(23,686)
Common shares issued, net of withholding tax	(9,207)	(5,130)	(649)	(3,466)
Common shares in non-qualified plans	195	130	298	136
Stock-based compensation	4,511	8,995	3,620	6,976
Cash dividends declared	(16,061)	(16,081)	(15,470)	(15,418)
Dividends to noncontrolling interests		(1,921)	(11,760)
Balance	1,923,967	1,901,916	1,639,292	1,646,972	1,923,967	1,639,292
Additional Paid-in Capital
Balance	294,794	290,799	277,085	273,439	290,799	273,439
Common shares issued, net of withholding tax	(9,207)	(5,130)	(649)	(3,466)
Common shares in non-qualified plans	195	130	298	136
Stock-based compensation	4,511	8,995	3,620	6,976
Balance	290,293	294,794	280,354	277,085	290,293	280,354
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(28,587)	(23,179)	(43,312)	(22,850)	(23,179)	(22,850)
Other comprehensive (loss) income	14,446	(5,408)	(3,224)	(20,462)
Balance	(14,141)	(28,587)	(46,536)	(43,312)	(14,141)	(46,536)
Retained Earnings
Balance	1,508,416	1,428,391	1,278,827	1,230,163	1,428,391	1,230,163
Net earnings	24,302	96,106	16,218	64,082
Cash dividends declared	(16,061)	(16,081)	(15,470)	(15,418)
Balance	1,516,657	1,508,416	1,279,575	1,278,827	1,516,657	1,279,575
Parent
Balance	1,774,623	1,696,011	1,512,600	1,480,752	1,696,011	1,480,752
Net earnings	24,302	96,106	16,218	64,082
Other comprehensive (loss) income	14,446	(5,408)	(3,224)	(20,462)
Common shares issued, net of withholding tax	(9,207)	(5,130)	(649)	(3,466)
Common shares in non-qualified plans	195	130	298	136
Stock-based compensation	4,511	8,995	3,620	6,976
Cash dividends declared	(16,061)	(16,081)	(15,470)	(15,418)
Balance	1,792,809	1,774,623	1,513,393	1,512,600	1,792,809	1,513,393
Noncontrolling Interest
Balance	127,293	125,617	134,372	133,210	125,617	133,210
Net earnings	3,865	3,597	3,287	1,162
Dividends to noncontrolling interests		(1,921)	(11,760)
Balance	$ 131,158	$ 127,293	$ 125,899	$ 134,372	$ 131,158	$ 125,899