Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Assumptions of Options Estimated on Grant Date (Detail)

v3.7.0.1
Fair Value of Assumptions of Options Estimated on Grant Date (Detail) - $ / shares
9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Assumptions used to Determine Fair Value Options [Line Items]    
Dividends per year $ 0 $ 0
Volatility percentage 0.00% 606.00%
Risk free interest rate 0.00% 4.00%
Expected life (years) 0 years 5 years
Weighted Average Fair Value $ 0 $ 5.41