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Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies (Details3) - $ / shares	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Estimated fair value of stock options granted (in Dollars)	$ 11.41	$ 10.37	$ 9.77
Assumptions:
Expected dividend yield (percent)	1.80%	1.70%	1.60%
Expected stock price volatility (percent)	38.20%	38.60%	37.50%
Risk-free interest rate (percent)	2.20%	2.20%	0.90%
Expected life of options (in years)	6 years	6 years	6 years

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The estimated fair value of stock options granted.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)(iii)



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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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