Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.6.0.2
Employee Benefit Plan - Additional Information (Detail) - Employee Savings Plan - USD ($)
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Defined Contribution Plan Disclosure [Line Items]        
Qualified non-elective contribution     3.00%  
Qualified non-elective contribution expense $ 9,800 $ 5,700 $ 18,600 $ 5,700