Stock-Based Compensation - Summary of Non-Vested Stock Option Awards (Detail) - $ / shares shares in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Number of Stock Options
Non-vested, beginning of year	213
Granted	55	116	101
Vested	(111)
Forfeited	(2)
Non-vested, end of year	155	213
Weighted Average Grant Date Fair Value Per Share
Non-vested, beginning of year	$ 10.29
Granted	19.76
Vested	11.50
Forfeited	13.36
Non-vested, end of year	$ 13.66	$ 10.29