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, 2024	Aug. 31, 2024	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2024	Nov. 30, 2023
Balance	$ 903,241	$ 891,012	$ 1,901,916	$ 1,821,628	$ 891,012	$ 1,821,628
Net earnings (loss)	28,009	24,008	28,167	99,703	52,017	127,870
Other comprehensive income (loss), net of tax	(3,320)	484	14,446	(5,408)	(2,836)	9,038
Common shares issued, net of withholding tax	(3,893)	(3,158)	(9,207)	(5,130)
Common shares in non-qualified plans	56	32	195	130
Stock-based compensation	5,539	6,216	4,511	8,995
Purchases and retirement of common shares	(8,079)	(6,803)
Cash dividends declared	(8,595)	(8,550)	(16,061)	(16,081)
Dividends to noncontrolling interests				(1,921)
Balance	912,958	903,241	1,923,967	1,901,916	912,958	1,923,967
Additional Paid-in Capital
Balance	301,239	299,033	294,794	290,799	299,033	290,799
Common shares issued, net of withholding tax	(3,893)	(3,158)	(9,207)	(5,130)
Common shares in non-qualified plans	56	32	195	130
Stock-based compensation	5,539	6,216	4,511	8,995
Purchases and retirement of common shares	(1,212)	(884)
Balance	301,729	301,239	290,293	294,794	301,729	290,293
AOCI, Net of Tax
Balance	938	454	(28,587)	(23,179)	454	(23,179)
Other comprehensive income (loss), net of tax	(3,320)	484	14,446	(5,408)
Balance	(2,382)	938	(14,141)	(28,587)	(2,382)	(14,141)
Retained Earnings
Balance	599,176	589,392	1,508,416	1,428,391	589,392	1,428,391
Net earnings (loss)	28,260	24,253	24,302	96,106
Purchases and retirement of common shares	(6,867)	(5,919)
Cash dividends declared	(8,595)	(8,550)	(16,061)	(16,081)
Balance	611,974	599,176	1,516,657	1,508,416	611,974	1,516,657
Parent
Balance	901,353	888,879	1,774,623	1,696,011	888,879	1,696,011
Net earnings (loss)	28,260	24,253	24,302	96,106
Other comprehensive income (loss), net of tax	(3,320)	484	14,446	(5,408)
Common shares issued, net of withholding tax	(3,893)	(3,158)	(9,207)	(5,130)
Common shares in non-qualified plans	56	32	195	130
Stock-based compensation	5,539	6,216	4,511	8,995
Purchases and retirement of common shares	(8,079)	(6,803)
Cash dividends declared	(8,595)	(8,550)	(16,061)	(16,081)
Balance	911,321	901,353	1,792,809	1,774,623	911,321	1,792,809
Noncontrolling Interest
Balance	1,888	2,133	127,293	125,617	2,133	125,617
Net earnings (loss)	(251)	(245)	3,865	3,597
Dividends to noncontrolling interests				(1,921)
Balance	$ 1,637	$ 1,888	$ 131,158	$ 127,293	$ 1,637	$ 131,158