Changes in Equity - Summary of Changes in Equity by Component and in Total (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Feb. 28, 2023	Nov. 30, 2022	Aug. 31, 2022	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	Feb. 28, 2023	Feb. 28, 2022
Balance	$ 1,639,292	$ 1,646,972	$ 1,613,962	$ 1,633,091	$ 1,606,632	$ 1,551,695	$ 1,613,962	$ 1,551,695
Net earnings	50,258	19,505	65,244	58,647	113,185	141,475	135,007	313,307
Other comprehensive loss	36,228	(3,224)	(20,462)	(19,348)	(57,858)	(4,274)	12,542	(81,480)
Common shares issued, net of withholding tax	704	(649)	(3,466)	269	(2,694)	(4,091)
Common shares in non-qualified plans	107	298	136	79	257	89
Stock-based compensation	3,818	3,620	6,976	2,889	3,304	6,324
Purchases and retirement of common shares				(54,255)	(12,702)	(60,885)
Cash dividends declared	(15,149)	(15,470)	(15,418)	(14,407)	(14,154)	(14,504)
Dividends to noncontrolling interests		(11,760)		(3,360)	(2,879)	(9,197)
Balance	1,715,258	1,639,292	1,646,972	1,603,605	1,633,091	1,606,632	1,715,258	1,603,605
Additional Paid-in Capital
Balance	280,354	277,085	273,439	279,205	279,635	282,790	273,439	282,790
Common shares issued, net of withholding tax	704	(649)	(3,466)	269	(2,694)	(4,091)
Common shares in non-qualified plans	107	298	136	79	257	89
Stock-based compensation	3,818	3,620	6,976	2,889	3,304	6,324
Purchases and retirement of common shares				(5,559)	(1,297)	(5,477)
Balance	284,983	280,354	277,085	276,883	279,205	279,635	284,983	276,883
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	(46,536)	(43,312)	(22,850)	(16,745)	41,113	45,387	(22,850)	45,387
Other comprehensive loss	36,228	(3,224)	(20,462)	(19,348)	(57,858)	(4,274)
Balance	(10,308)	(46,536)	(43,312)	(36,093)	(16,745)	41,113	(10,308)	(36,093)
Retained Earnings
Balance	1,279,575	1,278,827	1,230,163	1,217,337	1,132,595	1,070,016	1,230,163	1,070,016
Net earnings	46,325	16,218	64,082	56,342	110,301	132,491
Purchases and retirement of common shares				(48,696)	(11,405)	(55,408)
Cash dividends declared	(15,149)	(15,470)	(15,418)	(14,407)	(14,154)	(14,504)
Balance	1,310,751	1,279,575	1,278,827	1,210,576	1,217,337	1,132,595	1,310,751	1,210,576
Parent
Balance	1,513,393	1,512,600	1,480,752	1,479,797	1,453,343	1,398,193	1,480,752	1,398,193
Net earnings	46,325	16,218	64,082	56,342	110,301	132,491
Other comprehensive loss	36,228	(3,224)	(20,462)	(19,348)	(57,858)	(4,274)
Common shares issued, net of withholding tax	704	(649)	(3,466)	269	(2,694)	(4,091)
Common shares in non-qualified plans	107	298	136	79	257	89
Stock-based compensation	3,818	3,620	6,976	2,889	3,304	6,324
Purchases and retirement of common shares				(54,255)	(12,702)	(60,885)
Cash dividends declared	(15,149)	(15,470)	(15,418)	(14,407)	(14,154)	(14,504)
Balance	1,585,426	1,513,393	1,512,600	1,451,366	1,479,797	1,453,343	1,585,426	1,451,366
Noncontrolling Interest
Balance	125,899	134,372	133,210	153,294	153,289	153,502	133,210	153,502
Net earnings	3,933	3,287	1,162	2,305	2,884	8,984
Dividends to noncontrolling interests		(11,760)		(3,360)	(2,879)	(9,197)
Balance	$ 129,832	$ 125,899	$ 134,372	$ 152,239	$ 153,294	$ 153,289	$ 129,832	$ 152,239