Defined Contribution Benefit Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution 401(K) benefit expense	$ 1,834,000	$ 1,204,000	$ 1,535,000
First 3% employees deferred amount
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan employer matching contribution	100.00%
Next 2% employees deferred amount
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan employer matching contribution	50.00%