Stock-Based Compensation - Summary of Performance Share Award Activity (Detail) - Performance Award Activity - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		May 31, 2023	May 31, 2022	May 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of year		160	177	158
Granted	[1]	118	67	65
Vested		(89)	(65)	(3)
Forfeited		(17)	(19)	(43)
Outstanding, end of year		172	160	177
Weighted Average Grant Date Fair Value
Outstanding, beginning of year		$ 42.93	$ 39.23	$ 42.45
Granted	[1]	43.40	52.22	36.93
Vested		38.91	42.82	47.76
Forfeited		39.36	41.80	46.86
Outstanding, end of year		$ 46.37	$ 42.93	$ 39.23
Weighted Average Remaining Contractual Life (in years)
Weighted average remaining contractual life of outstanding restricted common shares (in years)		1 year 7 months 2 days	10 months 24 days	1 year 2 months 1 day
Aggregate intrinsic value
Aggregate intrinsic value of outstanding restricted common shares		$ 9,636	$ 7,445	$ 11,730
Aggregate intrinsic value of restricted common shares vested during the year		$ 4,056	$ 3,994	$ 100

[1] Includes common shares related to previously granted awards that paid out at percentages above target levels.