Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.5.0.2
Employee Benefit Plan - Additional Information (Detail) - Employee Savings Plan - USD ($)
12 Months Ended
May 31, 2016
May 31, 2015
Defined Contribution Plan Disclosure [Line Items]    
Qualified non-elective contribution 3.00%  
Qualified non-elective contribution expense $ 22,000 $ 25,400