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, 2022	Aug. 31, 2022	Nov. 30, 2021	Aug. 31, 2021	Nov. 30, 2022	Nov. 30, 2021
Balance	$ 1,646,972	$ 1,613,962	$ 1,606,632	$ 1,551,695	$ 1,613,962	$ 1,551,695
Net earnings	19,505	65,244	113,185	141,475	84,749	254,660
Other comprehensive loss	(3,224)	(20,462)	(57,858)	(4,274)	(23,686)	(62,132)
Common shares issued, net of withholding tax	(649)	(3,466)	(2,694)	(4,091)
Common shares in non-qualified plans	298	136	257	89
Stock-based compensation	3,620	6,976	3,304	6,324
Purchases and retirement of common shares			(12,702)	(60,885)
Cash dividends declared	(15,470)	(15,418)	(14,154)	(14,504)
Dividends to noncontrolling interests	(11,760)		(2,879)	(9,197)
Balance	1,639,292	1,646,972	1,633,091	1,606,632	1,639,292	1,633,091
Additional Paid-in Capital
Balance	277,085	273,439	279,635	282,790	273,439	282,790
Common shares issued, net of withholding tax	(649)	(3,466)	(2,694)	(4,091)
Common shares in non-qualified plans	298	136	257	89
Stock-based compensation	3,620	6,976	3,304	6,324
Purchases and retirement of common shares			(1,297)	(5,477)
Balance	280,354	277,085	279,205	279,635	280,354	279,205
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(43,312)	(22,850)	41,113	45,387	(22,850)	45,387
Other comprehensive loss	(3,224)	(20,462)	(57,858)	(4,274)
Balance	(46,536)	(43,312)	(16,745)	41,113	(46,536)	(16,745)
Retained Earnings
Balance	1,278,827	1,230,163	1,132,595	1,070,016	1,230,163	1,070,016
Net earnings	16,218	64,082	110,301	132,491
Purchases and retirement of common shares			(11,405)	(55,408)
Cash dividends declared	(15,470)	(15,418)	(14,154)	(14,504)
Balance	1,279,575	1,278,827	1,217,337	1,132,595	1,279,575	1,217,337
Parent
Balance	1,512,600	1,480,752	1,453,343	1,398,193	1,480,752	1,398,193
Net earnings	16,218	64,082	110,301	132,491
Other comprehensive loss	(3,224)	(20,462)	(57,858)	(4,274)
Common shares issued, net of withholding tax	(649)	(3,466)	(2,694)	(4,091)
Common shares in non-qualified plans	298	136	257	89
Stock-based compensation	3,620	6,976	3,304	6,324
Purchases and retirement of common shares			12,702	(60,885)
Cash dividends declared	15,470	(15,418)	14,154	(14,504)
Balance	1,513,393	1,512,600	1,479,797	1,453,343	1,513,393	1,479,797
Noncontrolling Interest
Balance	134,372	133,210	153,289	153,502	133,210	153,502
Net earnings	3,287	1,162	2,884	8,984
Dividends to noncontrolling interests	11,760		2,879	(9,197)
Balance	$ 125,899	$ 134,372	$ 153,294	$ 153,289	$ 125,899	$ 153,294