BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
|9 Months Ended|
Feb. 28, 2017
|Accounting Policies [Abstract]|
|Fair Value of Assumptions of Options Estimated On Grant Date||
The fair value of the options is estimated on the date of the grant using the Black-Scholes option pricing model with the following assumptions:
Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
Reference 1: http://www.xbrl.org/2003/role/presentationRef