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Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies (Details3) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Estimated fair value of stock options granted (in Dollars)	$ 14.78	$ 11.41	$ 10.37
Assumptions:
Expected dividend yield (percent)	1.40%	1.80%	1.70%
Expected stock price volatility (percent)	38.20%	38.20%	38.60%
Risk-free interest rate (percent)	1.90%	2.20%	2.20%
Expected life of options (in years)	6 years	6 years	6 years
Current deferred income taxes		$ 81.0

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The estimated fair value of stock options granted.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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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.

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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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