Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020	Mar. 24, 2021	Mar. 20, 2019
Equity [Abstract]
Common Stock shares authorized for repurchase				5,618,464	6,600,000
Common Stock remaining shares authorized for repurchase	6,065,000
Repurchase of common shares	$ 180,248,000	$ 192,054,000	$ 50,972,000
Repurchases and retirement of common shares (in shares)	3,235,000	4,018,464	1,300,000
Deferred compensation obligation credited to common share option	$ 592,000	$ 556,000	$ 547,000