XML 40 R27.htm IDEA: XBRL DOCUMENT v3.20.4
Accounting for Stock-Based Compensation (Tables)
6 Months Ended
Nov. 30, 2020
Accounting for Stock-Based Compensation  
Schedule of assumptions used in the Black-Scholes option pricing model to estimate the fair value of stock option grant

Risk-free interest rate

    

0.4

%

Expected volatility of common stock

 

40.2

%

Dividend yield

 

1.6

%

Expected option term in years

 

4.8