Equity - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019	Mar. 24, 2021	Mar. 20, 2019	Sep. 27, 2017
Equity [Abstract]
Common Stock shares authorized for repurchase				5,618,464	6,600,000	6,828,855
Common Stock remaining shares authorized for repurchase	9,300,000			10,000,000
Repurchase of common shares	$ 192,054	$ 50,972	$ 168,113
Repurchases and retirement of common shares (in shares)	4,018,464	1,300,000	4,100,000
Deferred compensation obligation credited to common share option	$ 556	$ 547	$ 680