Stock-Based Compensation - Summary of Non-Vested Stock Option Awards (Detail) - $ / shares shares in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Number of Stock Options
Non-vested, beginning of year	155
Granted	84	55	116
Vested	(84)
Non-vested, end of year	155	155
Weighted Average Grant Date Fair Value Per Common Share
Non-vested, beginning of year	$ 13.66
Granted	16.36
Vested	12.40
Non-vested, end of year	$ 15.80	$ 13.66