Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.8.0.1
Employee Benefit Plan - Additional Information (Detail) - Employee Savings Plan - USD ($)
3 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Defined Contribution Plan Disclosure [Line Items]    
Qualified non-elective contribution 3.00%  
Qualified non-elective contribution expense $ 10,800 $ 8,800