Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.3.1.900
Employee Benefit Plan - Additional Information (Detail) - Employee Savings Plan - USD ($)
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Defined Contribution Plan Disclosure [Line Items]        
Qualified non-elective contribution 3.00%      
Qualified non-elective contribution expense $ 6,000 $ 5,400 $ 9,500 $ 15,500