Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.20.2
Employee Benefit Plan - Additional Information (Detail) - Employee Savings Plan - USD ($)
12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Defined Contribution Plan Disclosure [Line Items]      
Qualified non-elective contribution 3.00%    
Qualified non-elective contribution expense $ 97,000 $ 111,000 $ 61,000