Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies (Details3) - $ / shares	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Estimated fair value of stock options granted (in Dollars)	$ 10.45	$ 12.70	$ 14.78
Assumptions:
Expected dividend yield (percent)	1.50%	1.50%	1.40%
Expected stock price volatility (percent)	29.80%	36.60%	38.20%
Risk-free interest rate (percent)	2.10%	1.50%	1.90%
Expected life of options (in years)	6 years	6 years	6 years