Changes in Equity - Summary of Changes in Equity by Component and in Total (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Balance	$ 1,551,695	$ 966,433
Net earnings	141,475	618,738
Other comprehensive income (loss)	(4,274)	11,242
Common shares issued, net of withholding tax	(4,091)	(1,150)
Common shares in non-qualified plans	89	90
Stock-based compensation	6,324	3,022
Purchases and retirement of common shares	(60,885)	(54,320)
Cash dividends declared	(14,504)	(13,595)
Dividends to noncontrolling interests	(9,197)	(560)
Balance	1,606,632	1,529,900
Additional Paid-in Capital
Balance	282,790	283,776
Net earnings	0	0
Other comprehensive income (loss)	0	0
Common shares issued, net of withholding tax	(4,091)	(1,150)
Common shares in non-qualified plans	89	90
Stock-based compensation	6,324	3,022
Purchases and retirement of common shares	(5,477)	(7,536)
Cash dividends declared	0	0
Dividends to noncontrolling interests	0	0
Balance	279,635	278,202
Accumulated Other Comprehensive Income (Loss), Net of Tax
Balance	45,387	(35,217)
Net earnings	0	0
Other comprehensive income (loss)	(4,274)	11,242
Common shares issued, net of withholding tax	0	0
Common shares in non-qualified plans	0	0
Stock-based compensation	0	0
Purchases and retirement of common shares	0	0
Cash dividends declared	0	0
Dividends to noncontrolling interests	0	0
Balance	41,113	(23,975)
Retained Earnings
Balance	1,070,016	572,262
Net earnings	132,491	616,675
Other comprehensive income (loss)	0	0
Common shares issued, net of withholding tax	0	0
Common shares in non-qualified plans	0	0
Stock-based compensation	0	0
Purchases and retirement of common shares	(55,408)	(46,784)
Cash dividends declared	(14,504)	(13,595)
Dividends to noncontrolling interests	0	0
Balance	1,132,595	1,128,558
Parent
Balance	1,398,193	820,821
Net earnings	132,491	616,675
Other comprehensive income (loss)	(4,274)	11,242
Common shares issued, net of withholding tax	(4,091)	(1,150)
Common shares in non-qualified plans	89	90
Stock-based compensation	6,324	3,022
Purchases and retirement of common shares	(60,885)	(54,320)
Cash dividends declared	(14,504)	(13,595)
Dividends to noncontrolling interests	0	0
Balance	1,453,343	1,382,785
Noncontrolling Interest
Balance	153,502	145,612
Net earnings	8,984	2,063
Other comprehensive income (loss)	0	0
Common shares issued, net of withholding tax	0	0
Common shares in non-qualified plans	0	0
Stock-based compensation	0	0
Purchases and retirement of common shares	0	0
Cash dividends declared	0	0
Dividends to noncontrolling interests	(9,197)	(560)
Balance	$ 153,289	$ 147,115