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Stock-Based Compensation (Tables)
 6 Months Ended
Nov. 30, 2017
Non-Qualified Stock Options  
Assumptions to Value Stock Options

The following assumptions were used to value these stock options:

 

Dividend yield

      1.81 % 

Expected volatility

      36.65 % 

Risk-free interest rate

      1.98 % 

Expected term (years)

      6.0